CN108344528B - A method and device for measuring heat exchange in a multi-connected air-conditioning system - Google Patents

Abstract

The invention provides a method and device for measuring heat exchange of a multi-connected air conditioning system. The method includes: according to the principle of energy conservation of each component in and out of the multi-connected air conditioning system, obtaining the refrigeration temperature at the second outlet of the four-way valve. Obtain the fifth mass flow rate of the mixture composed of coolant and lubricating oil, obtain the eleventh enthalpy value of the mixture at the outlet of the main circuit of the subcooler, obtain the fifth enthalpy value of the mixture at the second outlet of the four-way valve, according to the fifth mass flow rate, fifth enthalpy value, and eleventh enthalpy value, obtain the cooling capacity of the multi-stage air conditioning system; and/or obtain the eighth oil separator enthalpy value of the mixture at the second outlet of the oil separator, according to the fifth mass The flow rate, the enthalpy value of the eighth oil separator, and the enthalpy value of the eleventh oil separator are used to obtain the heating capacity of the multi-connected air-conditioning system. The invention solves the problem of inaccurate measurement results of the heat exchange of the multi-connected air conditioning system in the prior art.

Description

A method and device for measuring heat exchange in a multi-connected air-conditioning system

technical field

The invention relates to the technical field of refrigeration and air-conditioning equipment, in particular to a method and device for measuring heat exchange of a multi-connected air-conditioning system.

Background technique

During the actual use of the multi-connected air-conditioning system, due to the influence of factors such as climatic conditions, installation location, usage and load conditions, there is a large gap between its field operation performance and the test performance in the laboratory. The actual performance of the air-conditioning system during use has always been an urgent problem to be solved in the industry. At present, the on-site measurement technology of power consumption is relatively mature, but the cooling (heat) amount cannot be accurately measured, so it is difficult to analyze the actual performance of the multi-connected air-conditioning system, which is not conducive to the optimal operation and management of the multi-connected air-conditioning system.

In the prior art, for the on-site performance measurement of the multi-connected air-conditioning system, it mainly starts from the outside of the refrigeration cycle, that is, the indoor air enthalpy difference method and the outdoor air enthalpy difference method are used for measurement, that is, by measuring the input of the heat exchanger under test. The air volume (or exhaust air volume) and the temperature and humidity of the inlet air (or exhaust air) are used to calculate the heat exchange between the air and the refrigerant; at the same time, the power consumption of the compressor of the cooling heat pump system is measured to calculate the cooling capacity of the cooling heat pump system. (heat) capacity and cooling (heat) energy efficiency ratio. When the above two methods are used, the air volume cannot be accurately measured due to the uneven distribution of the air flow field under field conditions; if an external air duct is used for measurement, the operation state of the cooling heat pump system will be affected, resulting in inaccurate test results. reflect the actual situation. When the outdoor air enthalpy difference method is used, especially when there is external wind disturbance, the measurement error of the cooling (heat) capacity of the cooling heat pump system is very large; when the indoor air enthalpy difference method is used, not only the air volume cannot be accurately measured, but also affects In the work of indoor personnel, especially under the condition of multiple indoor unit terminals, these problems make it difficult for the existing technology to meet the engineering test requirements.

Therefore, starting from the refrigerant side of the multi-connected air-conditioning system, measuring the flow and state parameters of the refrigerant, and calculating the cooling (heat) capacity of the multi-connected air-conditioning system has become a better technical solution. However, under the on-site conditions of the project, if the plug-in flowmeter is used, that is, the flowmeter is connected to the refrigerant pipeline to measure the flow of the refrigerant, the refrigerant pipeline must be destroyed, which will affect the reliability of the multi-connected air conditioning system and even damage a lot. connected air-conditioning system, so this method is not feasible.

In order to solve the above technical problems, Chinese patent document CN202442818U discloses a high-precision multi-connected air-conditioning (heat pump) unit indoor unit refrigerating capacity site for accurately measuring the cooling capacity of the indoor unit of a multi-connected air conditioner (heat pump) unit at the construction site The tester, by adjusting the lifting device, connects the detector with the indoor unit under test, to ensure that there is no air leakage, the deflector guides the air out of the indoor unit through the equalizing grid and directly back to the return air outlet, and the heating and humidifying component heats the air out. Humidify, make the air state at the return air outlet reach the required state, and then determine the cooling capacity of the indoor unit of the multi-connected air conditioner (heat pump) unit by measuring the input heat and water for balancing the cooling capacity and dehumidification capacity. The distribution of the flow field is not uniform, and this method cannot truly reflect the actual situation, which leads to inaccurate determination of the cooling capacity of the multi-connected air-conditioning system.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a method and device for measuring heat exchange of a multi-connected air-conditioning system, so as to solve the problem of inaccurate measurement results of heat exchange of a multi-connected air-conditioning system in the prior art.

According to a first aspect, an embodiment of the present invention provides a method for measuring heat exchange of a multi-stage air conditioning system, wherein the discharge port of the compressor of the multi-stage air conditioning system is connected to the inlet of an oil separator, and the oil separator The first outlet of the oil separator is connected to the suction port of the compressor, the second outlet of the oil separator is connected to the inlet of the four-way valve, and the first outlet of the four-way valve is connected to the inlet of the outdoor heat exchanger, and the outdoor heat exchanger The outlet of the heater is connected to the inlet of the subcooler, the first inlet of the gas-liquid separator is connected to the outlet of the bypass circuit of the subcooler, the second inlet is connected to the second outlet of the four-way valve, the gas-liquid separation The outlet of the recooler is connected to the inlet of the compressor, and the outlet of the main circuit of the recooler is connected to the indoor heat exchanger. According to the principle of energy conservation of each component, the fifth mass flow rate of the mixture of refrigerant and lubricating oil at the second outlet of the four-way valve is obtained; the eleventh mass flow rate of the mixture at the main circuit outlet of the subcooler is obtained. Enthalpy value; obtain the fifth enthalpy value of the mixture at the second outlet of the four-way valve, and obtain the multi-connected formula according to the fifth mass flow rate, the fifth enthalpy value, and the eleventh enthalpy value the cooling capacity of the air-conditioning system; and/or, obtaining the enthalpy value of the eighth oil separator of the mixture at the second outlet of the oil separator, according to the fifth mass flow rate, the enthalpy value of the eighth oil separator, the The eleventh enthalpy value is obtained to obtain the heating capacity of the multi-connected air-conditioning system.

Through the above steps, according to the principle of energy conservation of each component in and out of the multi-connected air conditioning system, first obtain the mass flow of the mixture at the outlet where the four-way valve is connected to the gas-liquid separator, and then obtain the mixture at the main circuit outlet of the subcooler The enthalpy value of the mixture and the enthalpy value of the mixture at the outlet where the four-way valve is connected to the gas-liquid separator, obtain the cooling capacity of the multi-connected air-conditioning system according to the above parameters, and/or, obtain the mixture at the oil separator and the four-way valve. The enthalpy value of the inlet, the heating capacity of the multi-connected air-conditioning system is obtained according to the above parameters, and the cooling capacity and/or heating capacity of the multi-connected air-conditioning system is obtained through this process. Since the enthalpy value and mixture at the outlet or inlet of each component are directly obtained The mass flow rate of the system can make the calculation result more accurately reflect the heat exchange of the system, which solves the problem of calculating the heating or cooling capacity by measuring the air volume in the prior art. The air volume cannot be measured accurately; if an external air duct is used for measurement, it will affect the operation state of the cooling and heat pump system, resulting in the problem that the test results cannot reflect the actual situation.

With reference to the first aspect, in the first embodiment of the first aspect of the embodiments of the present invention, the cooling capacity of the multi-connected air-conditioning system is calculated by the following formula: Q _e =G ₅ (h ₅ -h ₁₁ ), wherein Q _e represents the refrigerating capacity of the multiple air-conditioning system, in kW, G5 represents the _fifth mass flow rate of the mixture at the second outlet of the four-way valve, in kg/s, and _h5 represents the The fifth enthalpy value of the mixture at the second outlet of the four-way valve, h ₁₁ represents the eleventh enthalpy value of the mixture at the outlet of the main circuit of the subcooler, and the unit is kJ/kg.

In combination with the first embodiment of the first aspect, in the second embodiment of the first aspect of the present invention, the multi-connected air conditioning system further includes: a compressor oil return capillary, the inlet of the compressor oil return capillary is connected to the oil The first outlet of the separator is connected, and the outlet of the compressor oil return capillary is connected to the air inlet of the compressor; the solenoid valve outlet returns to the oil capillary, and the inlet of the solenoid valve outlet oil return capillary is connected to the four-way The inlet of the valve is connected, and the outlet of the oil return capillary at the outlet of the solenoid valve is connected with the second outlet of the four-way valve. The fifth mass flow rate of the mixture composed of refrigerant and lubricating oil at the second outlet of the four-way valve includes: obtaining the power of the compressor, the heat leakage, and the first enthalpy of the mixture at the suction port of the compressor value, the second enthalpy value of the mixture at the outlet of the compressor oil return capillary, the third enthalpy value of the mixture at the outlet of the gas-liquid separator, the fourth enthalpy value of the mixture at the outlet of the solenoid valve outlet oil return capillary The enthalpy value, the sixth enthalpy value of the mixture at the second inlet of the gas-liquid separator, the seventh enthalpy value of the mixture at the bypass loop outlet of the subcooler, the sixth enthalpy value of the mixture at the compressor discharge port. Eight compressor discharge enthalpy values; the ninth enthalpy value of the mixture at the inlet of the outdoor heat exchanger, the tenth enthalpy value of the mixture at the inlet of the subcooler, the enthalpy value of the mixture at the outlet of the main circuit of the subcooler The eleventh enthalpy value; the first enthalpy value of the mixture at the suction port of the compressor is obtained according to the power of the compressor, the heat leakage, the first enthalpy value and the enthalpy value of the exhaust port of the eighth compressor. mass flow; according to the first mass flow of the mixture, the first enthalpy value, the second enthalpy value, the third enthalpy value, the fourth enthalpy value, the fifth enthalpy value, the The sixth enthalpy value, the seventh enthalpy value, and the eighth compressor discharge port enthalpy value are used to obtain the fifth mass flow rate of the mixture at the second outlet of the four-way valve. Through the above steps, the enthalpy values of the mixture composed of refrigerant and lubricating oil at the inlet or outlet of each component in the multi-stage air-conditioning system are obtained, and then according to the principle of energy conservation, the enthalpy of the mixture at the second outlet of the four-way valve is obtained. Mass flow, because the process takes into account the energy changes of the mixture in the various components of the multi-stage air conditioning system, so the measurement results are more accurate.

In combination with the second embodiment of the first aspect, in the third embodiment of the first aspect of the present invention, the first mass flow rate of the mixture at the suction port of the compressor is calculated by the following formula: P _e +G ₁ h ₁ =Q _loss +G ₁ h′ ₈ , where P _e represents the power of the compressor, in kW, and G ₁ represents the first mass flow of the mixture at the suction port of the compressor, in kg/s , h ₁ represents the first enthalpy value of the mixture at the suction port of the compressor, in kJ/kg, Q _loss represents the heat leakage of the compressor, in kW, and h′ ₈ represents the mixture in the compression The enthalpy value of the eighth compressor exhaust port of the engine exhaust port, the unit is kJ/kg; the fifth mass flow rate of the mixture at the second outlet of the four-way valve is calculated by the following formula:

Wherein, h ₂ represents the second enthalpy value of the mixture at the outlet of the compressor oil return capillary, h ₃ represents the third enthalpy value of the mixture at the outlet of the gas-liquid separator, h ₄ represents the mixture at the solenoid valve outlet The fourth enthalpy value of the outlet of the outlet return oil capillary, h ₅ represents the fifth enthalpy value of the mixture at the second outlet of the four-way valve, h ₆ represents the sixth enthalpy value of the mixture at the second inlet of the gas-liquid separator Enthalpy value, h ₇ represents the seventh enthalpy value of the mixture at the outlet of the bypass loop of the subcooler, the unit of the above enthalpy value is kJ/kg, G ₂ represents the compressor oil return capillary outlet of the The second mass flow rate of the mixture, G ₃ represents the third mass flow rate of the mixture at the outlet of the gas-liquid separator, G ₄ represents the fourth mass flow rate of the mixture at the outlet of the oil return capillary at the outlet of the solenoid valve, G ₅ represents the fifth mass flow rate of the mixture at the second outlet of the four-way valve, _G6 represents the _sixth mass flow rate of the mixture at the second inlet of the gas-liquid separator, and G7 represents the recirculation The seventh mass flow rate of the mixture at the outlet of the bypass loop of the cooler, and the unit of the above mass flow rate is kg/s.

In combination with the first embodiment of the first aspect, in the fourth embodiment of the first aspect of the present invention, the multi-connected air conditioning system further includes: a solenoid valve outlet oil return capillary, and an inlet of the solenoid valve outlet oil return capillary It is connected with the inlet of the four-way valve, and the outlet of the oil return capillary at the outlet of the solenoid valve is connected with the second outlet of the four-way valve. According to the principle, obtaining the fifth mass flow rate of the mixture composed of refrigerant and lubricating oil at the second outlet of the four-way valve includes: obtaining the power and leakage heat of the compressor, and obtaining the mixture at the outlet of the gas-liquid separator. The third enthalpy value of the mixture, the fourth enthalpy value of the mixture at the outlet of the solenoid valve outlet oil return capillary, the sixth enthalpy value of the mixture at the second inlet of the gas-liquid separator, the The seventh enthalpy value at the outlet of the bypass loop, the eighth compressor discharge enthalpy value of the mixture at the compressor discharge port; the ninth enthalpy value of the mixture at the inlet of the outdoor heat exchanger, the mixture The tenth enthalpy value at the inlet of the subcooler, the eleventh enthalpy value of the mixture at the outlet of the main circuit of the subcooler; according to the power of the compressor, the leakage heat, the third enthalpy value and the The enthalpy value of the exhaust port of the eighth compressor, the third mass flow rate of the mixture at the outlet of the gas-liquid separator is obtained; according to the third mass flow rate, the third enthalpy value, and the fourth enthalpy value, the fifth enthalpy value, the sixth enthalpy value, and the seventh enthalpy value to obtain the fifth mass flow rate of the mixture at the second outlet of the four-way valve. Through the above process, by obtaining the enthalpy value of the mixture at the inlet or outlet of different components in the multi-connected air conditioning system, and then by the principle of energy conservation in and out of each component, the mixture between the four-way valve and the gas-liquid separator can be more accurately obtained. The mass flow of the connected outlet.

In combination with the fourth embodiment of the first aspect, in the fifth embodiment of the first aspect of the present invention, the third mass flow rate of the mixture at the outlet of the gas-liquid separator is calculated by the following formula: P _e +G ₃ h ₃ =Q _loss +G ₃ h ₈ , wherein _Pe represents the power of the compressor, in kW, and G ₃ represents the third mass flow of the mixture at the outlet of the gas-liquid separator, in kg/s, h3 represents the _third enthalpy value of the mixture at the outlet of the gas-liquid separator, in kJ/kg, Q _loss represents the heat leakage of the compressor, in kW, _h8 represents the mixture in oil The enthalpy of the eighth oil separator at the second outlet of the separator, in kJ/kg; the fifth mass flow rate of the mixture at the second outlet of the four-way valve is calculated by the following formula:

Wherein, h ₃ represents the third enthalpy value of the mixture at the outlet of the gas-liquid separator, h ₄ represents the fourth enthalpy value of the mixture at the outlet of the oil return capillary at the outlet of the solenoid valve, h ₅ represents the mixture at the fourth enthalpy value The fifth enthalpy value of the second outlet of the through valve, h6 represents the _sixth enthalpy value of the mixture at the second inlet of the gas-liquid separator, _h7 represents the sixth enthalpy value of the mixture at the bypass loop outlet of the subcooler Seven enthalpy values, the units of the above enthalpy values are all kJ/kg, G ₃ represents the third mass flow rate of the mixture at the outlet of the gas-liquid separator, G ₄ represents the outlet of the solenoid valve outlet oil return capillary The fourth mass flow rate of the mixture, G5 represents the _fifth mass flow rate of the mixture at the second outlet of the four-way valve, and _G6 represents the first mass flow rate of the mixture at the second inlet of the gas-liquid separator. Six mass flow rates, G ₇ represents the seventh mass flow rate of the mixture at the outlet of the bypass loop of the subcooler, and the units of the above mass flow rates are all kg/s.

In combination with the first embodiment of the first aspect, in the sixth embodiment of the first aspect of the embodiments of the present invention, according to the principle of energy conservation of the components in and out of the multi-connected air conditioning system, the four-way valve is obtained. The fifth mass flow rate of the mixture composed of refrigerant and lubricating oil at the second outlet includes: obtaining the power of the compressor, the heat leakage, the seventh enthalpy value of the mixture at the outlet of the bypass loop of the subcooler, The tenth enthalpy value of the mixture at the inlet of the subcooler, the eleventh enthalpy value of the mixture at the outlet of the main circuit of the subcooler; according to the power of the compressor, the leakage heat, the fifth enthalpy value, The seventh enthalpy value, the tenth enthalpy value, and the eleventh enthalpy value obtain the fifth mass flow rate of the mixture at the second outlet of the four-way valve.

With reference to the sixth embodiment of the first aspect, in the seventh embodiment of the first aspect of the present invention, the fifth mass flow rate of the mixture at the second outlet of the four-way valve is calculated by the following formula:

Wherein, P _e represents the power of the compressor, in kW, G ₅ represents the fifth mass flow rate of the mixture of refrigerant and lubricating oil at the second outlet of the four-way valve, in kg/s, h ₅ represents the fifth enthalpy value of the mixture at the second outlet of the four-way valve, in kJ/kg, G ₇ represents the seventh mass flow of the mixture at the outlet of the bypass loop of the subcooler, in units is kg/s, h ₇ represents the seventh enthalpy value of the mixture at the outlet of the bypass loop of the subcooler, the unit is kJ/kg, Q _loss represents the leakage heat of the compressor, the unit is kW, h ₈ represents The eighth oil separator enthalpy value of the mixture at the second outlet of the oil separator, in kJ/kg, h ₁₀ represents the tenth enthalpy value of the mixture at the subcooler inlet, in kJ/kg, h ₁₁ denotes the eleventh enthalpy value of the mixture at the outlet of the main loop of the subcooler, in kJ/kg.

With reference to the first aspect, in the eighth embodiment of the first aspect of the embodiments of the present invention, the heating capacity of the multi-connected air-conditioning system is calculated by the following formula: Q _c =G ₅ (h ₈ -h ₁₁ ), where Q _c Represents the heating capacity of the multi-connected air conditioning system, in kW, G ₅ represents the fifth mass flow rate of the mixture at the second outlet of the four-way valve, in kg/s, and h ₈ represents the The eighth oil separator enthalpy value of the mixture at the second outlet of the oil separator, in kJ/kg, h ₁₁ represents the eleventh enthalpy value of the mixture at the main circuit outlet of the subcooler, in kJ/kg .

In combination with the eighth embodiment of the first aspect, in the ninth embodiment of the first aspect of the present invention, when the subcooler is turned off, the fifth mass flow rate of the mixture is obtained by the following steps: obtaining the compressor power, leakage heat, and fifth enthalpy value of the mixture at the second outlet of the four-way valve; according to the compressor power, leakage heat, the fifth enthalpy value, and the eighth oil separator enthalpy value , the fifth mass flow rate of the mixture at the second outlet of the four-way valve is obtained.

With reference to the ninth embodiment of the first aspect, in the tenth embodiment of the first aspect of the present invention, the fifth mass flow rate of the mixture at the outlet of the four-way valve is calculated by the following formula: P _e +G ₅ h ₅ =Q _loss +G ₅ h ₈ , wherein, _Pe represents the power of the compressor, in kW, and G ₅ represents the first output of the mixture of refrigerant and lubricating oil at the second outlet of the four-way valve. Five mass flow, in kg/s, h5 represents the _fifth enthalpy value of the mixture at the second outlet of the four-way valve, in kJ/kg, Q _loss represents the heat leakage of the compressor, in kW , h ₈ represents the eighth oil separator enthalpy value of the mixture at the second outlet of the oil separator, in kJ/kg.

In combination with the eighth embodiment of the first aspect and the eleventh embodiment of the first aspect of the present invention, when the subcooler is turned on, the fifth mass flow rate of the mixture is obtained by the following steps: obtaining the compression The power of the compressor, the heat leakage, and the third enthalpy of the mixture at the outlet of the gas-liquid separator; according to the power of the compressor, the leakage heat, the third enthalpy, and the enthalpy of the eighth oil separator, Obtain the third mass flow of the mixture at the outlet of the gas-liquid separator; obtain the seventh enthalpy of the mixture at the outlet of the bypass loop of the subcooler; according to the third mass flow, the third The third enthalpy value, the fifth enthalpy value, and the seventh enthalpy value obtain the fifth mass flow rate of the mixture at the second outlet of the four-way valve.

In conjunction with the eleventh embodiment of the first aspect, in the twelfth embodiment of the first aspect of the present invention, the third mass flow rate of the mixture is calculated by the following formula: P _e +G ₃ h ₃ =Q _loss + G ₃ h ₈ , wherein, _Pe represents the power of the compressor, in kW, G ₃ represents the third mass flow of the mixture at the outlet of the gas-liquid separator, in kg/s, and h ₃ represents the The third enthalpy value of the mixture at the outlet of the gas-liquid separator, in kJ/kg, Q _loss represents the heat leakage of the compressor, in kW, h ₈ represents the amount of the mixture at the second outlet of the oil separator The enthalpy value of the eighth oil separator, in kJ/kg; the fifth mass flow rate of the mixture at the second outlet of the four-way valve is calculated by the following formula:

Wherein, G ₃ represents the third mass flow rate of the mixture at the outlet of the gas-liquid separator, in kg/s, and h ₃ represents the third enthalpy of the mixture at the outlet of the gas-liquid separator, in kJ/kg , G ₅ represents the fifth mass flow rate of the mixture at the second outlet of the four-way valve, in kg/s, h ₅ represents the fifth enthalpy of the mixture at the second outlet of the four-way valve, in units is kJ/kg, G ₇ represents the seventh mass flow rate of the mixture at the outlet of the bypass loop of the recooler, in kg/s, h ₇ represents the flow rate of the mixture at the outlet of the bypass loop of the recooler The seventh enthalpy, in kJ/kg.

According to a second aspect, an embodiment of the present invention provides a device for measuring heat exchange of a multi-stage air conditioning system, wherein the exhaust port of the compressor of the multi-stage air conditioning system is connected to the inlet of an oil separator, and the oil separator The first outlet of the oil separator is connected to the suction port of the compressor, the second outlet of the oil separator is connected to the inlet of the four-way valve, and the first outlet of the four-way valve is connected to the inlet of the outdoor heat exchanger, and the outdoor heat exchanger The outlet of the heater is connected to the inlet of the subcooler, the first inlet of the gas-liquid separator is connected to the outlet of the bypass circuit of the subcooler, the second inlet is connected to the second outlet of the four-way valve, the gas-liquid separation The outlet of the recooler is connected to the inlet of the compressor, and the outlet of the main circuit of the recooler is connected to the indoor heat exchanger. to obtain the fifth mass flow rate of the mixture composed of refrigerant and lubricating oil at the second outlet of the four-way valve according to the principle of energy conservation in and out of each component in the multi-connected air-conditioning system; the first obtaining module, is used to obtain the eleventh enthalpy value of the mixture at the outlet of the main circuit of the subcooler; the second processing module is used to obtain the fifth enthalpy value of the mixture at the second outlet of the four-way valve, according to the first The fifth mass flow rate, the fifth enthalpy value, and the eleventh enthalpy value are used to obtain the cooling capacity of the multi-connected air-conditioning system; and/or, a third processing module, used to obtain the mixture in the oil separator The enthalpy value of the eighth oil separator at the second outlet of the . Through the above device, the cooling capacity and/or the heating capacity of the multi-connected air-conditioning system can be obtained more accurately by utilizing the principle of energy conservation of each component in and out of the multi-connected air-conditioning system.

According to a third aspect, an embodiment of the present invention provides a computer device, at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores data executable by the at least one processor The computer program, the computer program is executed by the at least one processor, so that the at least one processor executes the replacement of the multi-connected air conditioning system in the first aspect or any one of the embodiments of the first aspect Heat measurement method.

According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the first aspect or the first aspect is implemented The method for measuring the heat exchange of a multi-connected air-conditioning system described in any one of the embodiments.

The technical scheme of the present invention has the following advantages:

The invention provides a method and a device for measuring heat exchange of a multi-connected air-conditioning system. The exhaust port of the compressor of the multi-connected air-conditioning system is connected to the inlet of an oil separator, and the first outlet of the oil separator is connected to an outlet of the compressor. The suction port, the second outlet of the oil separator is connected to the inlet of the four-way valve, the first outlet of the four-way valve is connected to the inlet of the outdoor heat exchanger, the outlet of the outdoor heat exchanger is connected to the inlet of the recooler, and the gas-liquid separation The first inlet of the cooler is connected to the bypass circuit outlet of the recooler, the second inlet is connected to the second outlet of the four-way valve, the outlet of the gas-liquid separator is connected to the compressor inlet, and the main circuit outlet of the recooler is connected to the indoor heat exchange The method for measuring the heat exchange of the multi-connected air-conditioning system includes: according to the principle of energy conservation of each component in and out of the multi-connected air-conditioning system, obtaining the mixture of refrigerant and lubricating oil at the second outlet of the four-way valve. At the fifth mass flow rate, obtain the eleventh enthalpy value of the mixture at the outlet of the main circuit of the subcooler, and obtain the fifth enthalpy value of the mixture at the second outlet of the four-way valve, according to the fifth mass flow rate, the fifth enthalpy value, the first Eleven enthalpy values, obtain the refrigerating capacity of the multi-stage air conditioning system; and/or, obtain the enthalpy value of the eighth oil separator of the mixture at the second outlet of the oil separator, according to the fifth mass flow rate, the enthalpy of the eighth oil separator value and the eleventh enthalpy value to obtain the heating capacity of the multi-connected air-conditioning system. Through the above steps, according to the principle of energy conservation of each component in and out of the multi-connected air conditioning system, first obtain the mass flow of the mixture at the outlet where the four-way valve is connected to the gas-liquid separator, and then obtain the mixture at the main circuit outlet of the subcooler The enthalpy value of the mixture and the enthalpy value of the mixture at the outlet where the four-way valve is connected to the gas-liquid separator, obtain the cooling capacity of the multi-connected air-conditioning system according to the above parameters, and/or, obtain the mixture at the oil separator and the four-way valve. The enthalpy value of the inlet, the heating capacity of the multi-connected air-conditioning system is obtained according to the above parameters, and the cooling capacity and/or heating capacity of the multi-connected air-conditioning system is obtained through this process. Since the enthalpy value and mixture at the outlet or inlet of each component are directly obtained The mass flow rate of the system can make the calculation result more accurately reflect the heat exchange of the system, which solves the problem of calculating the heating or cooling capacity by measuring the air volume in the prior art. The air volume cannot be measured accurately; if an external air duct is used for measurement, it will affect the operation state of the cooling and heat pump system, resulting in the problem that the test results cannot reflect the actual situation.

Description of drawings

The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be construed as limiting the invention in any way, in which:

1 is a flowchart of a method for measuring heat exchange of a multi-connected air-conditioning system according to an embodiment of the present invention;

2 is a schematic diagram (1) of a multi-connected air conditioning system according to an embodiment of the present invention;

3 is a schematic diagram (2) of a multi-connected air-conditioning system according to an embodiment of the present invention;

4 is a schematic diagram (3) of a multi-connected air conditioning system according to an embodiment of the present invention;

5 is a schematic diagram (4) of a multi-connected air-conditioning system according to an embodiment of the present invention;

6 is a schematic diagram (5) of a multi-connected air conditioning system according to an embodiment of the present invention;

7 is a structural block diagram of a device for measuring heat exchange of a multi-connected air-conditioning system according to an embodiment of the present invention;

8 is a schematic diagram of the hardware structure of a computer device for a method for measuring heat exchange of a multi-connected air-conditioning system provided by an embodiment of the present invention;

Reference numerals: compressor-21, oil separator-22, four-way valve-23, outdoor heat exchanger-24, subcooler-25, gas-liquid separator-26, indoor heat exchanger-27, compressor Oil return capillary -28, solenoid valve outlet return oil capillary -29.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

Embodiments of the present invention provide a method for measuring heat exchange of a multi-connected air conditioning system. In a preferred embodiment, the method for measuring heat exchange of a multi-stage air-conditioning system can be applied to the multi-stage air-conditioning system as shown in FIG. The inlet of the oil separator 22, the first outlet of the oil separator 22 is connected to the suction port of the compressor 21, the second outlet of the oil separator 22 is connected to the inlet of the four-way valve 23, and the first outlet of the four-way valve 23 is connected to the outdoor The inlet of the heat exchanger 24, the outlet of the outdoor heat exchanger 24 is connected to the inlet of the subcooler 25, the first inlet of the gas-liquid separator 26 is connected to the bypass loop outlet of the subcooler 25, and the second inlet is connected to the four-way valve 23 The second outlet of the gas-liquid separator 26 is connected to the inlet of the compressor 21 , and the main circuit outlet of the subcooler 25 is connected to the indoor heat exchanger 27 .

As shown in FIG. 1 , the method for measuring heat exchange of a multi-connected air conditioning system according to an embodiment of the present invention includes:

Step S101: According to the principle of energy conservation of each component in the multi-connected air conditioning system, obtain the fifth mass flow rate of the mixture of refrigerant and lubricating oil at the second outlet of the four-way valve; When each component in a multi-connected air-conditioning system, the energy entering the component and the energy outputting the component are conserved. According to this principle, the first number of the mixture of refrigerant and lubricating oil connected to the outlet of the gas-liquid separator by the four-way valve is obtained. Five mass flow.

Step S102: Obtain the eleventh enthalpy value of the mixture at the outlet of the main circuit of the subcooler. Since the subcooler is connected between the outdoor heat exchanger and the indoor heat exchanger, obtain the enthalpy of the mixture at the outlet of the main circuit of the subcooler. The enthalpy value can more accurately measure the cooling capacity of the multi-connected air conditioning system.

Step S103: Obtain the fifth enthalpy value of the mixture at the second outlet of the four-way valve, and obtain the cooling capacity of the multi-connected air-conditioning system according to the fifth mass flow rate, the fifth enthalpy value, and the eleventh enthalpy value; and/or ,

Step S104: Obtain the enthalpy value of the eighth oil separator of the mixture at the second outlet of the oil separator, and obtain the heating.

Through the above steps, according to the principle of energy conservation of each component in and out of the multi-connected air conditioning system, first obtain the mass flow of the mixture at the outlet where the four-way valve is connected to the gas-liquid separator, and then obtain the mixture at the main circuit outlet of the subcooler The enthalpy value of the mixture and the enthalpy value of the mixture at the outlet where the four-way valve is connected to the gas-liquid separator, obtain the cooling capacity of the multi-connected air-conditioning system according to the above parameters, and/or, obtain the mixture at the oil separator and the four-way valve. The enthalpy value of the inlet, the heating capacity of the multi-connected air-conditioning system is obtained according to the above parameters, and the cooling capacity and/or heating capacity of the multi-connected air-conditioning system is obtained through this process. Since the enthalpy value and mixture at the outlet or inlet of each component are directly obtained The mass flow rate of the system can make the calculation result more accurately reflect the heat exchange of the system, which solves the problem of calculating the heating or cooling capacity by measuring the air volume in the prior art. The air volume cannot be measured accurately; if an external air duct is used for measurement, it will affect the operation state of the cooling and heat pump system, resulting in the problem that the test results cannot reflect the actual situation.

Specifically, the cooling capacity of the multi-connected air-conditioning system is calculated by the following formula (1):

Q _e =G ₅ (h ₅ -h ₁₁ ) (1)

In formula (1), Q _e represents the cooling capacity of the multi-connected air-conditioning system, the unit is kW, and G ₅ represents the fifth mass flow rate of the mixture at the second outlet of the four-way valve 23, and the unit is kg/s, h ₅ represents the fifth enthalpy value of the mixture at the second outlet of the four-way valve 23, h ₁₁ represents the eleventh enthalpy value of the mixture at the main circuit outlet of the subcooler 25, in kJ /kg.

In a specific embodiment, as shown in FIG. 2 , the multi-stage air-conditioning system further includes a compressor oil return capillary 28, the inlet of the compressor oil return capillary 28 is connected to the first outlet of the oil separator 22, and the compressor returns The outlet of the oil capillary 28 is connected to the air inlet of the compressor 21, the solenoid valve outlet returns to the oil capillary 29, the inlet of the solenoid valve outlet returns the oil capillary 29 to the inlet of the four-way valve 23, and the solenoid valve outlet returns to the oil capillary 29. The outlet is connected to the second outlet of the four-way valve 23, and the fifth mass flow rate of the mixture of refrigerant and lubricating oil at the second outlet of the four-way valve in the above specific embodiment is the mixture at point 5 in FIG. 2 . The mass flow rate can be obtained by the following steps:

Obtain the power of the compressor 21, the heat leakage, the first enthalpy value of the mixture at the suction port of the compressor 21, the second enthalpy value of the mixture at the outlet of the compressor oil return capillary 28, and the mixture at the outlet of the gas-liquid separator 26 The third enthalpy value of the mixture, the fourth enthalpy value of the mixture at the outlet of the oil return capillary 29 at the outlet of the solenoid valve, the sixth enthalpy value of the mixture at the second inlet of the gas-liquid separator 26, the mixture at the bypass loop of the subcooler 25 The seventh enthalpy value of the outlet, the eighth compressor discharge enthalpy value of the mixture at the discharge port of the compressor 21, the ninth enthalpy value of the mixture at the inlet of the outdoor heat exchanger 24, and the first enthalpy value of the mixture at the inlet of the subcooler 25. Ten enthalpy values, the eleventh enthalpy value of the mixture at the outlet of the main circuit of the subcooler 25, wherein the enthalpy value of each point corresponds to the enthalpy value of the mixture at the positions of point 1 to point 11 in FIG. 2, specifically, point The enthalpy of the refrigerant from 1 to point 7 is calculated from the suction pressure of the compressor 21 and the temperature at each point, respectively. The suction pressure of the compressor 21 is obtained by a pressure sensor arranged at the suction port of the compressor 21, The temperature at each point is acquired by the temperature sensor set at each point; the enthalpy values of the refrigerant at points 8 and 9 are respectively calculated from the discharge pressure of the compressor 21 and the temperature at each point, wherein the compressor 21 The discharge pressure is obtained by the pressure sensor installed at the discharge port of the compressor 21; when the subcooler 25 is closed, the enthalpy value of the refrigerant at point 11 is calculated from the temperature at the point 11. When the cooler 26 is turned on, the enthalpy of the refrigerant at point 10 is calculated from the temperature at point 10 to calculate the saturated liquid enthalpy, and the enthalpy of the refrigerant at point 11 is calculated from the discharge pressure of the compressor 21 and the temperature at point 11. Obtained; the enthalpy value of the lubricating oil at each point is determined by the temperature at each point. The above process obtains the enthalpy of the refrigerant and the enthalpy of the lubricating oil at points 1 to 11 respectively, and the enthalpy at each point The enthalpy of the mixture of refrigerant and lubricating oil is calculated by the following formulas (2), (3):

G _n =G _n,ref +G _n,oil (2)

In formula (2), G _n represents the nth mass flow rate of the mixture composed of refrigerant and lubricating oil, the unit is kg/s; G _n,ref represents the mass flow rate of the refrigerant at the position of point n, the unit is kg/s; G _n,oil represents the mass flow rate of lubricating oil at the position of point n, the unit is kg/s; wherein, n=1,2,...,11.

h _n =G _n,ref ×h _n,ref +G _n,oil ×h _n,oil (3)

In formula (3), h _n represents the nth enthalpy value of the mixture composed of refrigerant and lubricating oil, and the unit is kJ/kg; G _n,ref represents the mass flow rate of the refrigerant at the position of point n, and the unit is Kg/s; G _n,oil represents the mass flow rate of lubricating oil at the position of point n, the unit is Kg/s; h _n,ref represents the enthalpy value of the refrigerant at the position of point n, the unit is kJ/kg; h _n,oil represents the position of point n The enthalpy value of the lubricating oil, in kJ/kg, where n=1,2,...,11.

According to the power of the compressor, the heat leakage, the first enthalpy value and the enthalpy value of the exhaust port of the eighth compressor, the first mass flow rate of the mixture at the suction port of the compressor is obtained. Specifically, the first mass flow rate of the mixture is calculated by the following formula (4). A mass flow:

P _e +G ₁ h ₁ =Q _loss +G ₁ h′ ₈ , (4)

In formula (4), P _e represents the power of the compressor 21, the unit is kW, G ₁ represents the first mass flow rate of the mixture at the suction port of the compressor 21, the unit is kg/s, and h ₁ represents the mixture in the compressor 21. The first enthalpy value of the suction port, the unit is kJ/kg, Q _loss is the heat leakage of the compressor 21, the unit is kW, and h′ ₈ is the eighth compressor discharge port enthalpy of the mixture at the discharge port of the compressor 21 value in kJ/kg.

According to the first mass flow of the mixture, the first enthalpy value, the second enthalpy value, the third enthalpy value, the fourth enthalpy value, the fifth enthalpy value, the sixth enthalpy value, the seventh enthalpy value, the eighth compressor discharge port The enthalpy value, the fifth mass flow rate of the mixture at the second outlet of the four-way valve 23 is obtained. Specifically, the fifth mass flow rate of the mixture at the second outlet of the four-way valve 23 is calculated by the following formula (5):

In formula (5), h ₂ represents the second enthalpy value of the mixture at the outlet of the compressor oil return capillary 28 , h ₃ represents the third enthalpy value of the mixture at the outlet of the gas-liquid separator 26 , h ₄ represents the mixture at the outlet of the solenoid valve The fourth enthalpy value of the outlet of the outlet oil return capillary 29 , h ₅ represents the fifth enthalpy value of the mixture at the second outlet of the four-way valve 23 , h ₆ represents the sixth enthalpy of the mixture at the second inlet of the gas-liquid separator 26 value, h ₇ represents the seventh enthalpy value of the mixture at the outlet of the bypass loop of the subcooler 25, the units of the above enthalpy values are all kJ/kg, G ₂ represents the second mass of the mixture at the outlet of the compressor oil return capillary 28 Flow rate, G3 represents the third mass flow of the mixture at the outlet of the gas-liquid separator ₂₆ , G4 represents the _fourth mass flow of the mixture at the outlet of the oil return capillary at the outlet of the solenoid valve, G5 represents the fourth mass flow of the _four -way valve 23 The fifth mass flow rate of the mixture at the second outlet, G6 represents the _sixth mass flow rate of the mixture at the second inlet of the gas-liquid separator 26, G7 represents the _seventh mass flow rate of the mixture at the bypass loop outlet of the subcooler 25, The units of the above mass flow rates are all kg/s.

Through formula (4), which is an energy conservation equation, the first mass flow rate G ₁ of the mixture can be obtained, and then G ₁ is substituted into formula (5), the parameters G ₂ to G ₇ can be obtained simultaneously, that is, the mixture can be obtained The fifth mass flow G ₅ , and then the cooling capacity of the multi-connected air-conditioning system is obtained by formula (1). Through this calculation method, since the temperature and pressure at the inlet and outlet of each component are collected in detail, the corresponding mass flow and enthalpy value of the mixture at each point position can be obtained, and then the cooling capacity can be calculated, making the calculation result of the cooling capacity more accurate.

As shown in Figure 3, in a specific embodiment, the fifth mass flow rate of the above mixture can also be obtained by the following steps:

Calculate the third mass flow of the mixture at the outlet of the gas-liquid separator 26:

P _e +G ₃ h ₃ =Q _loss +G ₃ h ₈ (6)

In formula (6), P _e represents the power of the compressor 21, in kW, G ₃ represents the third mass flow rate of the mixture at the outlet of the gas-liquid separator 26, in kg/s, h ₃ represents the mixture in the gas The third enthalpy value of the outlet of the liquid separator 26 in kJ/kg, Q _loss represents the heat leakage of the compressor 21 in kW, h ₈ represents the eighth oil separation of the mixture at the second outlet of the oil separator 22 The enthalpy value of the device is in kJ/kg, wherein the calculation method of each enthalpy value has been described in detail in the formula (3) in the above-mentioned specific embodiment, and will not be repeated here. After the third mass flow rate of the mixture is obtained, the fifth mass flow rate of the mixture at the second outlet of the four-way valve 23 is calculated by the following formula (7):

In formula (7), h ₃ represents the third enthalpy value of the mixture at the outlet of the gas-liquid separator 26, h ₄ represents the fourth enthalpy value of the mixture at the outlet of the oil return capillary 29 at the outlet of the solenoid valve, and h ₅ represents the mixture at the fourth enthalpy value. The fifth enthalpy value of the second outlet of the through valve 23, h6 represents the _sixth enthalpy value of the mixture at the second inlet of the gas-liquid separator 26, h7 represents the _seventh enthalpy value of the mixture at the bypass loop outlet of the subcooler 25 Enthalpy value, the unit of the above-mentioned enthalpy value is kJ/kg, G3 represents the third mass flow rate of the mixture at the outlet of the gas-liquid separator ₂₆ , G4 represents the _fourth mass of the mixture at the outlet of the solenoid valve outlet oil return capillary 29 Flow rate, G5 represents the _fifth mass flow of the mixture at the second outlet of the four-way valve 23, G6 represents the _sixth mass flow of the mixture at the second inlet of the gas-liquid separator ₂₆ , G7 represents the bypass of the subcooler 25 The seventh mass flow rate of the mixture at the outlet of the flow loop, and the unit of the above mass flow rate is kg/s. The calculation method of each enthalpy value has been described in detail in the formula (3) in the above-mentioned specific embodiment, and will not be repeated here. After the fifth mass flow rate of the mixture is obtained according to the above formula (7), it is substituted into the formula (1) to obtain the cooling capacity of the multi-connected air-conditioning system. The quantity calculation method reduces the required pressure sensor and temperature sensor, and simplifies the calculation process.

In the multi-connected air-conditioning system shown in Figure 3, the cooling capacity can also be calculated by the following formula (8):

Q _e =G ₃ (h ₃ -h ₁₀ ) (8)

In formula (8), Q _e represents the cooling capacity of the multi-connected air-conditioning system, in kW, G ₃ represents the third mass flow rate of the mixture at the outlet of the gas-liquid separator 26, in kg/s, h ₃ represents the mixture in the gas The third enthalpy value at the outlet of the liquid separator 26 is in kJ/kg, and h ₁₀ represents the tenth enthalpy value of the mixture at the inlet of the subcooler 25 in kJ/kg.

As shown in FIG. 4, in a specific embodiment, the fifth mass flow rate of the mixture at the second outlet of the four-way valve is calculated by the following formula (9):

In formula (9), P _e represents the power of the compressor 21, in kW, G ₅ represents the fifth mass flow rate of the mixture of refrigerant and lubricating oil at the second outlet of the four-way valve 23, in kg/ s, h ₅ represents the fifth enthalpy value of the mixture at the second outlet of the four-way valve 23, in kJ/kg, G ₇ represents the seventh mass flow of the mixture at the outlet of the bypass loop of the subcooler 25, in kg /s, h ₇ represents the seventh enthalpy value of the mixture at the outlet of the bypass loop of the subcooler 25, in kJ/kg, Q _loss represents the heat leakage of the compressor 21, in kW, h ₈ represents the mixture at the oil separation The enthalpy value of the eighth oil separator at the second outlet of the cooler 22, in kJ/kg, h ₁₀ represents the tenth enthalpy value of the mixture at the inlet of the subcooler 25, in kJ/kg, h ₁₁ represents the mixture in the subcooling Eleventh enthalpy value at the outlet of the main circuit of the device 25, in kJ/kg. As shown in FIG. 4 , the number of pressure sensors and temperature sensors required in FIG. 4 is much reduced compared to the specific embodiments corresponding to the above-mentioned FIGS. 2 and 3 . This calculation method also uses the principle of energy conservation. The fifth mass flow rate of the mixture is obtained, and then the fifth mass flow rate of the mixture is substituted into formula (1) to obtain the cooling capacity of the multi-connected air-conditioning system.

In another specific embodiment, the cooling capacity corresponding to the schematic diagrams of the multi-connected air-conditioning systems shown in FIG. 2 to FIG. 4 can also be obtained by the following formula (10):

Q _e =Q _c -P _e +Q _loss -P _f (10)

In formula (10), Q _e represents the cooling capacity of the multi-connected air-conditioning system, in kW, Q _c represents the exhaust heat of the outdoor heat exchanger 24, in kW, and P _e represents the power of the compressor 21, in kW , Q _loss is the heat leakage of the compressor 21, the unit is kW, P _f is the power of the outdoor side fan, the unit is kW, and the parameter P _f is considered when installing the outdoor side fan in the multi-connected air-conditioning system. If the outdoor side fan is not installed in the combined air-conditioning system, the parameter P _f does not need to be considered; the exhaust heat Q _c =(G ₇ +G ₅ )(h ₉ -h ₁₀ ) of the outdoor side heat exchanger 24, h ₉ represents The ninth enthalpy value of the mixture at the inlet of the outdoor heat exchanger 24, in kJ/kg, h ₁₀ represents the tenth enthalpy value of the mixture at the inlet of the subcooler 25, in kJ/kg, G ₅ represents the four-way valve _The fifth mass flow rate of the mixture of refrigerant and lubricating oil at the second outlet of is kg/s.

In a specific embodiment, the heating capacity of the multi-connected air-conditioning system is calculated by the following formula (11):

Q _c =G ₅ (h ₈ -h ₁₁ ) (11)

In formula (11), Q _c represents the heating capacity of the multi-stage air-conditioning system, in kW, G ₅ represents the fifth mass flow rate of the mixture at the second outlet of the four-way valve 23, in kg/s, h ₈ represents the eighth oil separator enthalpy value of the mixture at the second outlet of the oil separator 22, in kJ/kg, h ₁₁ represents the eleventh enthalpy value of the mixture at the main loop outlet of the subcooler 25, in kJ/ kg. The schematic diagrams of the multi-connected air-conditioning system corresponding to this formula are the structural diagrams of the air-conditioning system shown in FIGS. 5 to 6 . Through this formula, the fifth mass flow rate of the mixture is obtained first, and then the heating capacity of the multi-connected air conditioning system is calculated. The calculation process is simple, and the heating capacity of the multi-connected air conditioning system can be obtained simply and accurately.

In a specific embodiment, as shown in FIG. 5 , when the subcooler 25 is closed, the fifth mass flow rate of the above mixture is obtained by the following steps:

Obtain the power of the compressor 21, the leakage heat, and the fifth enthalpy value of the mixture at the second outlet of the four-way valve 23, and obtain the power, leakage heat, fifth enthalpy value, and eighth oil separator enthalpy value of the compressor 21 according to The fifth mass flow of the mixture at the second outlet of the four-way valve 23 . Specifically, the fifth mass flow rate of the mixture at the outlet of the four-way valve is calculated by the following formula (12):

P _e +G ₅ h ₅ =Q _loss +G ₅ h ₈ (12)

In formula (12), P _e represents the power of the compressor 21 in kW, G ₅ represents the fifth mass flow rate of the mixture of refrigerant and lubricating oil at the second outlet of the four-way valve, in kg/s , h ₅ is the fifth enthalpy value of the mixture at the second outlet of the four-way valve, in kJ/kg, Q _loss is the heat leakage of the compressor, in kW, h ₈ is the mixture at the second outlet of the oil separator The enthalpy of the eighth oil separator, in kJ/kg. The enthalpy of the refrigerant at point 5 is calculated from the suction pressure of compressor 21 and the temperature at point 5, and the enthalpy of refrigerant at point 8 is calculated from the discharge pressure of compressor 21 and the temperature at point 8. The enthalpy value of the lubricating oil at each point is determined by the temperature of each point, and the enthalpy value of the mixture composed of refrigerant and lubricating oil is calculated from the enthalpy value and mass flow rate of the refrigerant and lubricating oil at each point. obtained, and the specific calculation process is shown in the detailed description of formula (3), which will not be repeated here. Through this energy conservation equation, the fifth mass flow rate of the mixture can be calculated and then substituted into formula (11) to calculate the heating capacity of the multi-connected air-conditioning system.

In another specific embodiment, as shown in FIG. 6 , when the subcooler is turned on, the fifth mass flow rate of the mixture is obtained by the following steps:

Calculate the third mass flow of the mixture:

P _e +G ₃ h ₃ =Q _loss +G ₃ h ₈ (13)

In formula (13), the power of the compressor 21 in P _e is in kW, G ₃ represents the third mass flow rate of the mixture at the outlet of the gas-liquid separator 26, in kg/s, and h ₃ represents the mixture in the gas-liquid separation The third enthalpy value at the outlet of the oil separator 26, the unit is kJ/kg, Q _loss is the heat leakage of the compressor 21, the unit is kW, h ₈ is the eighth oil separator enthalpy value of the mixture at the second outlet of the oil separator 22 , the unit is kJ/kg, after the third mass flow rate of the mixture is obtained, the fifth mass flow rate of the mixture at the second outlet of the four-way valve 23 is calculated by the following formula (14):

In formula (14), G ₃ represents the third mass flow rate of the mixture at the outlet of the gas-liquid separator 26, in kg/s, and h ₃ represents the third enthalpy of the mixture at the outlet of the gas-liquid separator 26, in kJ/kg , G ₅ represents the fifth mass flow rate of the mixture at the second outlet of the four-way valve 23, the unit is kg/s, h ₅ represents the fifth enthalpy value of the mixture at the second outlet of the four-way valve 23, the unit is kJ/kg , G7 represents the _seventh mass flow rate of the mixture at the outlet of the bypass loop of the subcooler 25, the unit is kg/s, h7 represents the _seventh enthalpy value of the mixture at the outlet of the bypass loop of the subcooler 25, the unit is kJ /kg. Among them, the enthalpy values of the refrigerant at points 3, 5 and 7 are calculated from the suction pressure of the compressor 22 of the multi-stage air-conditioning system and the temperature at each point, and the enthalpy value of the lubricating oil at the point 8 of the compressor 21 Calculate the discharge pressure and temperature, and the corresponding enthalpy value of the mixture composed of the refrigerant and the lubricating oil can be obtained from the refrigerant and the lubricating oil. The fifth mass flow rate of the mixture is calculated through this formula, and then substituted into formula (11) to obtain the heating capacity of the multi-connected air-conditioning system.

For the multi-connected air-conditioning system shown in Figure 5, the heating value can also be calculated by the following formula (15):

Q _c =Q _e +P _e -Q _loss (15)

In formula (15), Q _c represents the heating capacity of the multi-stage air-conditioning system, in kW, Q _e represents the heat absorption of the outdoor heat exchanger 24, in kW, and P _e represents the power of the compressor 21, in the unit of kW, Q _loss represents the heat leakage of the compressor, in kW, where Q _e =G ₃ (h ₃ -h ₁₁ ), G ₃ represents the third mass flow rate of the mixture at the outlet of the gas-liquid separator 26 , h ₃ represents the third enthalpy value of the mixture at the outlet of the gas-liquid separator, and h ₁₁ represents the eleventh enthalpy value of the mixture at the outlet of the main circuit of the subcooler 25 . Specifically, the enthalpy of the refrigerant at point 3 is calculated from the suction pressure of the compressor 21 and the temperature at this point, and the enthalpy of the refrigerant at point 8 is calculated from the discharge pressure of the compressor 21 and the temperature at this point. The enthalpy value of the refrigerant at point 11 is obtained by calculating the saturated liquid enthalpy value of the temperature, the enthalpy value of the lubricating oil at each point is determined by the temperature of each point, and the enthalpy of the mixture composed of refrigerant and lubricating oil is obtained. The value is calculated from the enthalpy value and mass flow rate of the refrigerant and lubricating oil at each point. The specific calculation process has been described in detail in formula (3), and will not be repeated here.

This embodiment also provides a device for measuring heat exchange of a multi-connected air-conditioning system, the device is used to implement the above embodiments and preferred implementations, and what has been described will not be repeated. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, implementations in hardware, or a combination of software and hardware, are also possible and contemplated.

In a preferred embodiment, the apparatus for measuring the heat exchange of the multi-stage air conditioning system according to the embodiment of the present invention can be used to measure the heat exchange amount of the multi-stage air conditioning system as shown in FIG. 2 . The exhaust port of the compressor 21 of the multi-stage air conditioning system is connected to the inlet of the oil separator 22, the first outlet of the oil separator 22 is connected to the suction port of the compressor 21, and the second outlet of the oil separator 22 is connected to the four The inlet of the through valve 23, the first outlet of the four-way valve 23 is connected to the inlet of the outdoor heat exchanger 24, the outlet of the outdoor heat exchanger 24 is connected to the inlet of the subcooler 25, and the first inlet of the gas-liquid separator 26 is connected to the subcooler The outlet of the bypass circuit of the cooler 25, the second inlet is connected to the second outlet of the four-way valve 23, the outlet of the gas-liquid separator 26 is connected to the inlet of the compressor 21, and the main circuit outlet of the subcooler 25 is connected to the indoor heat exchanger 27.

As shown in FIG. 7 , the apparatus for measuring heat exchange of a multi-connected air-conditioning system according to an embodiment of the present invention includes: a first processing module 31, which is used to obtain a four-way connection according to the principle of energy conservation of components in and out of the multi-connected air-conditioning system. the fifth mass flow rate of the mixture composed of refrigerant and lubricating oil at the second outlet of the valve 23; the first acquisition module 32 is used to acquire the eleventh enthalpy value of the mixture at the outlet of the main circuit of the subcooler 25; the second The processing module 33 is configured to obtain the fifth enthalpy value of the mixture at the second outlet of the four-way valve 23, and obtain the cooling capacity of the multi-connected air-conditioning system according to the fifth mass flow rate, the fifth enthalpy value, and the eleventh enthalpy value; And/or, the third processing module 34 is configured to obtain the eighth oil separator enthalpy value of the mixture at the second outlet of the oil separator 22, according to the fifth mass flow rate, the eighth oil separator enthalpy value, and the eleventh enthalpy value to get the heating capacity of the multi-connected air-conditioning system.

Through the multi-connected air conditioning system heat exchange measurement device, the first processing module 31 utilizes the principle of energy conservation in and out of each component to obtain the mass flow of the mixture at the second outlet of the four-way valve 23, and then the second processing module 32 obtains the heating value of the multi-connected air-conditioning system through the obtained enthalpy value of each point and the fifth mass flow rate, and/or, the third processing module 33 obtains the multi-stage air conditioning system through the obtained enthalpy value of each point and the fifth mass flow rate. The heating capacity of the connected air-conditioning system can be obtained through the enthalpy value and mass flow rate to obtain the heat exchange, which solves the problem of inaccurate calculation results in the prior art that the cooling capacity or heating capacity is converted by measuring the air volume.

Further functional descriptions of the above-mentioned modules are the same as those of the above-mentioned corresponding embodiments, and are not repeated here.

An embodiment of the present invention also provides a computer device. FIG. 8 is a schematic diagram of the hardware structure of a computer device for a method for measuring heat exchange of a multi-connected air conditioning system provided by an embodiment of the present invention. As shown in FIG. 8 , the computer device includes a or multiple processors 41 and a memory 42, one processor 41 is taken as an example in FIG. 8 .

The computer equipment may further include: an input device 43 and an output device 44 .

The processor 41 , the memory 42 , the input device 43 and the output device 44 may be connected by a bus or in other ways, and the connection by a bus is taken as an example in FIG. 8 .

The processor 41 may be a central processing unit (Central Processing Unit, CPU). The processor 41 may also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA) or Other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components and other chips, or a combination of the above types of chips. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

As a non-transitory computer-readable storage medium, the memory 42 can be used to store non-transitory software programs, non-transitory computer-executable programs and modules, such as the method for measuring heat exchange of a multi-connected air conditioning system in the embodiment of the present invention. Corresponding program instructions/modules (for example, the first processing module 31, the first acquisition module 32, the second processing module 33, the third processing module 34, etc. shown in FIG. 7). The processor 41 executes various functional applications and data processing of the server by running the non-transitory software programs, instructions and modules stored in the memory 42, that is, to realize the heat exchange of the multi-connected air conditioning system described in the above method embodiments. Measurement methods.

The memory 42 may include a stored program area and a stored data area, wherein the stored program area may store an operating system and an application program required by at least one function; created data, etc. Additionally, memory 42 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 42 may optionally include a memory located remotely relative to the processor 41, and these remote memories may be connected to the heat exchange measuring device of the multi-connected air conditioning system through a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

The input device 43 can receive the query request (or other numerical or character information) input by the user, and generate key signal input related to the user setting and function control of the heat exchange measuring device of the multi-connected air conditioning system. The output device 44 may include a display device such as a display screen, and is used to output the calculation result.

The one or more modules are stored in the memory 42 , and when executed by the one or more processors 41 , perform the methods shown in FIGS. 1 to 6 .

The above product can execute the method provided by the embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the method. For technical details that are not described in detail in this embodiment, reference may be made to the related descriptions in the embodiments shown in FIG. 1 to FIG. 6 for details.

Embodiments of the present invention further provide a non-transitory computer storage medium, where computer-executable instructions are stored in the computer storage medium, and the computer-executable instructions can execute the heat exchange measurement of a multi-connected air conditioning system in any of the above method embodiments method. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a flash memory (Flash Memory), a hard disk (Hard) Disk Drive, abbreviation: HDD) or solid-state drive (Solid-State Drive, SSD), etc.; the storage medium may also include a combination of the above-mentioned types of memories.

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. And the obvious changes or changes derived from this are still within the protection scope of the present invention.

Claims (16)

1. A method for measuring the heat exchange capacity of a multi-connected air conditioning system, wherein an exhaust port of a compressor of the multi-connected air conditioning system is connected with an inlet of an oil separator, a first outlet of the oil separator is connected with an air suction port of the compressor, a second outlet of the oil separator is connected with an inlet of a four-way valve, a first outlet of the four-way valve is connected with an inlet of an outdoor heat exchanger, an outlet of the outdoor heat exchanger is connected with an inlet of a recooler, a first inlet of a gas-liquid separator is connected with an outlet of a bypass loop of the recooler, a second inlet of the gas-liquid separator is connected with a second outlet of the four-way valve, an outlet of the gas-liquid separator is connected with an inlet of the compressor, and a main loop outlet of the recoole:

obtaining a fifth mass flow of a mixture consisting of the refrigerant and the lubricating oil at a second outlet of the four-way valve according to the principle of energy conservation of each component in the multi-connected air conditioning system;

obtaining an eleventh enthalpy value of the mixture at the outlet of the main loop of the subcooler;

acquiring a fifth enthalpy value of the mixture at a second outlet of a four-way valve, and acquiring the refrigerating capacity of the multi-connected air conditioning system according to the fifth mass flow, the fifth enthalpy value and the eleventh enthalpy value; and/or the presence of a gas in the gas,

and acquiring an enthalpy value of an eighth oil separator of the mixture at a second outlet of the oil separator, and acquiring the heating capacity of the multi-connected air-conditioning system according to the fifth mass flow, the enthalpy value of the eighth oil separator and the eleventh enthalpy value.

2. The method for measuring the amount of heat exchanged by the multi-connected air conditioning system according to claim 1, wherein the cooling capacity of the multi-connected air conditioning system is calculated by the following formula:

Q_e＝G₅(h₅-h₁₁)，

wherein Q is_eThe unit of the refrigerating capacity of the multi-connected air conditioning system is kW and G₅Represents a fifth mass flow of the mixture at the second outlet of the four-way valve in kg/s, h₅Represents the fifth enthalpy value, h, of the mixture at the second outlet of the four-way valve₁₁Represents the eleventh enthalpy of the mixture at the outlet of the main circuit of the subcooler, in kJ/kg.

3. The method for measuring the amount of heat exchanged by the multi-connected air conditioning system according to claim 2, wherein the multi-connected air conditioning system further comprises: an inlet of the compressor oil return capillary tube is connected with a first outlet of the oil separator, and an outlet of the compressor oil return capillary tube is connected with an air inlet of the compressor; an inlet of the solenoid valve outlet oil return capillary tube is connected with an inlet of the four-way valve, an outlet of the solenoid valve outlet oil return capillary tube is connected with a second outlet of the four-way valve,

the obtaining of the fifth mass flow of the mixture of the refrigerant and the lubricating oil at the second outlet of the four-way valve according to the principle of energy conservation of each component in the multi-connected air conditioning system includes:

acquiring the power of the compressor, the heat leakage quantity, a first enthalpy value of the mixture at a suction port of the compressor, a second enthalpy value of the mixture at an outlet of an oil return capillary tube of the compressor, a third enthalpy value of the mixture at an outlet of a gas-liquid separator, a fourth enthalpy value of the mixture at an outlet of an oil return capillary tube of an electromagnetic valve, a sixth enthalpy value of the mixture at a second inlet of the gas-liquid separator, a seventh enthalpy value of the mixture at an outlet of a bypass circuit of a recooler and an eighth enthalpy value of an exhaust port of the compressor of the mixture at an exhaust port of the compressor; a ninth enthalpy of the mixture at the inlet of the outdoor heat exchanger, a tenth enthalpy of the mixture at the inlet of the sub-cooler, and an eleventh enthalpy of the mixture at the outlet of the main loop of the sub-cooler;

obtaining a first mass flow of the mixture at the air suction port of the compressor according to the power, the heat leakage quantity, the first enthalpy value and the enthalpy value of the exhaust port of the eighth compressor;

and obtaining a fifth mass flow rate of the mixture at a second outlet of the four-way valve according to the first mass flow rate, the first enthalpy value, the second enthalpy value, the third enthalpy value, the fourth enthalpy value, the fifth enthalpy value, the sixth enthalpy value, the seventh enthalpy value and the enthalpy value of an exhaust port of the eighth compressor of the mixture.

4. The method of claim 3, wherein the first mass flow rate of the mixture at the compressor suction is calculated by the following equation:

P_e+G₁h₁＝Q_loss+G₁h＇₈,

wherein, P_eRepresents the power of the compressor in kW, G₁A first mass flow rate of said mixture, expressed in kg/s, h, representing the suction of said compressor₁Represents a first enthalpy value of the mixture at the suction port of the compressor, expressed in kJ/kg, Q_lossDenotes the heat leakage quantity of the compressor, and the unit is kW, h'₈Expressing the enthalpy of the eighth compressor discharge at the compressor discharge of said mixture in kJ/kg;

calculating a fifth mass flow rate of the mixture at the second outlet of the four-way valve by the equation:

wherein h is₂Indicating a second enthalpy value, h, of said mixture at the outlet of the oil return capillary of the compressor₃Represents the third enthalpy value, h, of the mixture at the outlet of the gas-liquid separator₄Represents the fourth enthalpy value, h, of the mixture at the outlet of the solenoid valve return capillary₅Represents the fifth enthalpy value, h, of the mixture at the second outlet of the four-way valve₆Represents a sixth enthalpy value, h, of said mixture at the second inlet of the gas-liquid separator₇Represents a seventh enthalpy value of the mixture at the outlet of the bypass circuit of the recooler, said enthalpy values all being expressed in kJ/kg, G₂Representing a second mass flow, G, of said mixture at the outlet of said compressor oil return capillary₃Representing a third mass flow, G, of said mixture at the outlet of said gas-liquid separator₄Representing a fourth mass flow, G, of said mixture at the outlet of said solenoid valve outlet return capillary₅Represents a fifth mass flow, G, of the mixture at the second outlet of the four-way valve₆Represents a sixth mass flow, G, of said mixture at the second inlet of said gas-liquid separator₇Represents a seventh mass flow of the mixture at the bypass loop outlet of the subcooler, said mass flow being in kg/s.

5. The method for measuring the amount of heat exchanged by the multi-connected air conditioning system according to claim 2, wherein the multi-connected air conditioning system further comprises: an inlet of the solenoid valve outlet oil return capillary tube is connected with an inlet of the four-way valve, an outlet of the solenoid valve outlet oil return capillary tube is connected with a second outlet of the four-way valve,

the obtaining of the fifth mass flow of the mixture of the refrigerant and the lubricating oil at the second outlet of the four-way valve according to the principle of energy conservation of each component in the multi-connected air conditioning system includes:

obtaining power of the compressor, heat leakage, a third enthalpy of the mixture at an outlet of the gas-liquid separator, a fourth enthalpy of the mixture at an outlet of an oil return capillary tube at an outlet of a solenoid valve, a sixth enthalpy of the mixture at a second inlet of the gas-liquid separator, a seventh enthalpy of the mixture at an outlet of a bypass circuit of a recooler, an eighth compressor discharge port enthalpy of the mixture at a discharge port of the compressor, a ninth enthalpy of the mixture at an inlet of an outdoor heat exchanger, a tenth enthalpy of the mixture at an inlet of the recooler, and an eleventh enthalpy of the mixture at an outlet of a main circuit of the recooler;

obtaining a third mass flow of the mixture at the outlet of the gas-liquid separator according to the power of the compressor, the heat leakage quantity, the third enthalpy value and the enthalpy value of the exhaust port of the eighth compressor;

and obtaining a fifth mass flow of the mixture at a second outlet of the four-way valve according to the third mass flow, the third enthalpy, the fourth enthalpy, the fifth enthalpy, the sixth enthalpy and the seventh enthalpy.

6. The method of claim 5, wherein the third mass flow of the mixture at the outlet of the gas-liquid separator is calculated by the following formula:

P_e+G₃h₃＝Q_loss+G₃h₈,

wherein, P_eRepresents the power of the compressor in kW, G₃Represents a third mass flow of said mixture at the outlet of said gas-liquid separator in kg/s, h₃Represents the third enthalpy value of the mixture at the outlet of the gas-liquid separator, and has the unit of kJ/kg, Q_lossRepresents the heat leakage of the compressor in kW, h₈An eighth oil separator enthalpy value, expressed in kJ/k, representing the second outlet of the oil separator of said mixtureg；

Calculating a fifth mass flow rate of the mixture at the second outlet of the four-way valve by the equation:

wherein h is₃Represents the third enthalpy value, h, of the mixture at the outlet of the gas-liquid separator₄Represents the fourth enthalpy value, h, of the mixture at the outlet of the solenoid valve return capillary₅Represents the fifth enthalpy value, h, of the mixture at the second outlet of the four-way valve₆Represents a sixth enthalpy value, h, of said mixture at the second inlet of the gas-liquid separator₇Represents a seventh enthalpy value of the mixture at the outlet of the bypass circuit of the recooler, said enthalpy values all being expressed in kJ/kg, G₃Representing a third mass flow, G, of said mixture at the outlet of said gas-liquid separator₄Representing a fourth mass flow, G, of said mixture at the outlet of said solenoid valve outlet return capillary₅Represents a fifth mass flow, G, of the mixture at the second outlet of the four-way valve₆Represents a sixth mass flow, G, of said mixture at the second inlet of said gas-liquid separator₇Represents a seventh mass flow of the mixture at the bypass loop outlet of the subcooler, said mass flow being in kg/s.

7. The method for measuring the heat exchange capacity of the multi-connected air conditioning system according to claim 2, wherein the obtaining of the fifth mass flow of the mixture of the refrigerant and the lubricating oil at the second outlet of the four-way valve according to the principle of energy conservation of each component in the multi-connected air conditioning system comprises:

obtaining power from the compressor, heat leakage, a seventh enthalpy of the mixture at the bypass circuit outlet of the subcooler, a tenth enthalpy of the mixture at the subcooler inlet, and an eleventh enthalpy of the mixture at the main circuit outlet of the subcooler;

and obtaining a fifth mass flow of the mixture at a second outlet of the four-way valve according to the power of the compressor, the heat leakage quantity, the fifth enthalpy value, the seventh enthalpy value, the tenth enthalpy value and the eleventh enthalpy value.

8. The method of claim 7, wherein the fifth mass flow of the mixture at the second outlet of the four-way valve is calculated by the following equation:

wherein, P_eRepresents the power of the compressor in kW, G₅A fifth mass flow rate in kg/s, h representing a mixture of refrigerant and lubricating oil at a second outlet of the four-way valve₅Represents the fifth enthalpy value of the mixture at the second outlet of the four-way valve, and the unit is kJ/kg, G₇Represents a seventh mass flow of the mixture at the bypass loop outlet of the recooler in kg/s, h₇Represents the seventh enthalpy of the mixture at the outlet of the bypass circuit of the recooler, in kJ/kg, Q_lossRepresents the heat leakage of the compressor in kW, h₈An eighth oil separator enthalpy value representing the mixture at the second outlet of the oil separator in kJ/kg, h₁₀Represents the tenth enthalpy of the mixture at the inlet of the recooler in kJ/kg, h₁₁Represents the eleventh enthalpy of the mixture at the outlet of the main circuit of the subcooler, in kJ/kg.

9. The method for measuring the amount of heat exchanged by the multi-connected air conditioning system according to claim 1, wherein the heating capacity of the multi-connected air conditioning system is calculated by the following formula:

Q_c＝G₅(h₈-h₁₁)，

wherein Q is_cRepresents the heating capacity of the multi-connected air conditioning system, and the unit is kW and G₅Second of said four-way valveA fifth mass flow of said mixture at the outlet in kg/s, h₈An eighth oil separator enthalpy value representing the mixture at the second outlet of the oil separator in kJ/kg, h₁₁Represents the eleventh enthalpy of the mixture at the outlet of the main circuit of the subcooler, in kJ/kg.

10. The method of claim 9, wherein a fifth mass flow of the mixture is obtained by the steps of, when the sub-cooler is off:

acquiring the power of the compressor, the heat leakage quantity and a fifth enthalpy value of the mixture at a second outlet of the four-way valve;

and obtaining a fifth mass flow of the mixture at a second outlet of the four-way valve according to the power of the compressor, the heat leakage quantity, the fifth enthalpy value and the enthalpy value of the eighth oil separator.

11. The method of claim 10, wherein the fifth mass flow of the mixture at the outlet of the four-way valve is calculated by the following formula:

P_e+G₅h₅＝Q_loss+G₅h₈，

wherein, P_eRepresents the power of the compressor in kW, G₅A fifth mass flow rate in kg/s, h representing a mixture of refrigerant and lubricating oil at a second outlet of the four-way valve₅Represents the fifth enthalpy value of the mixture at the second outlet of the four-way valve, and has the unit of kJ/kg, Q_lossRepresents the heat leakage of the compressor in kW, h₈An eighth oil separator enthalpy value, expressed in kJ/kg, representing the mixture at the second outlet of the oil separator.

12. The method of claim 9, wherein the fifth mass flow of the mixture is obtained by the steps of, when the sub-cooler is on:

acquiring the power of the compressor, the heat leakage quantity and a third enthalpy value of the mixture at the outlet of the gas-liquid separator;

obtaining a third mass flow of the mixture at the outlet of the gas-liquid separator according to the power of the compressor, the heat leakage quantity, the third enthalpy value and the enthalpy value of the eighth oil separator;

obtaining a seventh enthalpy value of the mixture at the bypass circuit outlet of the subcooler;

and obtaining a fifth mass flow of the mixture at a second outlet of the four-way valve according to the third mass flow, the third enthalpy, the fifth enthalpy and the seventh enthalpy.

13. The method of claim 12, wherein the third mass flow of the mixture is calculated by the following equation:

P_e+G₃h₃＝Q_loss+G₃h₈

wherein, P_eRepresents the power of the compressor in kW, G₃Represents a third mass flow of said mixture at the outlet of said gas-liquid separator in kg/s, h₃Represents the third enthalpy value of the mixture at the outlet of the gas-liquid separator and has the unit of kJ/kg, Q_lossRepresents the heat leakage of the compressor in kW, h₈An eighth oil separator enthalpy value, expressed in kJ/kg, representative of said mixture at the second outlet of the oil separator;

calculating a fifth mass flow rate of the mixture at the second outlet of the four-way valve by the equation:

wherein G is₃Represents a third mass flow of said mixture at the outlet of said gas-liquid separator in kg/s, h₃Means that the mixture is in a gas-liquid separatorThe third enthalpy of the outlet is expressed in kJ/kg, G₅Represents a fifth mass flow of said mixture at the second outlet of said four-way valve in kg/s, h₅Represents the fifth enthalpy value of the mixture at the second outlet of the four-way valve, and the unit is kJ/kg, G₇Represents a seventh mass flow of the mixture at the bypass loop outlet of the recooler in kg/s, h₇Represents the seventh enthalpy of the mixture at the outlet of the bypass circuit of the subcooler, in kJ/kg.

14. The utility model provides a multiple air conditioning system heat transfer volume measuring device, the entry of oil separator is connected to the gas vent of multiple air conditioning system's compressor, the first exit linkage of oil separator the induction port of compressor, the second export of oil separator is through the entry of connecting the cross valve, the entry of the outdoor heat exchanger of first exit linkage of cross valve, the entry of the exit linkage recooler of outdoor heat exchanger, the first entry linkage of vapour and liquid separator the bypass circuit export of recooler, the second entry linkage the second export of cross valve, the exit linkage of vapour and liquid separator the entry of compressor, the main loop exit linkage indoor heat exchanger of recooler, its characterized in that, multiple air conditioning system heat transfer volume measuring device includes:

the first processing module is used for obtaining a fifth mass flow of a mixture consisting of the refrigerant and the lubricating oil at a second outlet of the four-way valve according to the principle of energy conservation of each component in the multi-connected air conditioning system;

a first capture module for capturing an eleventh enthalpy of the mixture at the main circuit outlet of the subcooler;

the second processing module is used for acquiring a fifth enthalpy value of the mixture at a second outlet of the four-way valve and obtaining the refrigerating capacity of the multi-connected air conditioning system according to the fifth mass flow, the fifth enthalpy value and the eleventh enthalpy value; and/or the presence of a gas in the gas,

and the third processing module is used for acquiring an enthalpy value of an eighth oil separator of the mixture at a second outlet of the oil separator, and obtaining the heating capacity of the multi-connected air-conditioning system according to the fifth mass flow, the enthalpy value of the eighth oil separator and the eleventh enthalpy value.

15. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method for measuring a heat exchange amount of a multi-type air conditioning system according to any one of claims 1 to 13.

16. A computer device, comprising:

at least one processor; and

a memory communicatively coupled to the at least one processor; wherein the memory stores a computer program executable by the at least one processor to cause the at least one processor to perform the method of measuring a heat exchange amount of a multi-connected air conditioning system according to any one of claims 1 to 13.

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