JPH09145196A - Air conditioner operation control method - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] An air conditioner capable of cooling / heating and dehumidifying operation, in which power consumption is reduced especially during dehumidifying operation, and indoor air temperature and humidity are appropriately adjusted. A reheater (5) is divided into two parts, and a dehumidifying throttle valve (6) used during dehumidifying operation is provided between them to control the rotation speeds of a compressor (1), an outdoor fan (7) and an indoor fan (9), In addition, an electric expansion valve 4 having a variable throttling amount is provided between the reheaters 5a and 5b and the other cooler 3 during the dehumidifying operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner operation control method capable of cooling, heating and dehumidifying operations.

[0002]

2. Description of the Related Art As an air conditioner having a conventional dehumidifying function, there is JP-A-7-139848, which has a structure as shown in FIG. This air conditioner is a compressor 2
1, four-way valve 22, outdoor heat exchanger 23, main throttle device 24,
The two-way valves 25, 28, the indoor heat exchangers 26a, 26b, the dehumidifying expansion device 27, and the connecting pipes that connect them constitute a refrigeration cycle. Four-way valve 2 during dehumidification operation
2 is switched in the same manner as during the cooling operation, and the two-way valve 25 is opened and the two-way valve 28 is closed, so that the refrigerant, the compressor 21, the four-way valve 22, the outdoor heat exchanger 23, and the two-way valve are indicated by the one-dot chain line. 25, the indoor heat exchanger 26a, the dehumidifying expansion device 27, the indoor heat exchanger 26b, the four-way valve 22, and the compressor 21 are circulated in this order, the outdoor heat exchanger 23 is the upstream condenser, and the indoor heat exchanger 26a is the downstream. When the side condenser and the indoor heat exchanger 26b are set to be evaporators and the indoor air is made to flow by the indoor fan 32 as indicated by an arrow 35, the air is evaporated, that is,
After being cooled and dehumidified by the indoor heat exchanger 26b acting as a cooler, it is heated again by the downstream condenser, that is, the indoor heat exchanger 26a serving as a reheater, and blown out into the room. In this case, the capacities of the cooler 26b and the reheater 26a can be adjusted by further controlling the rotation speed of the compressor 21 and the rotation speeds of the indoor fan 32 and the outdoor fan 30, and finally the dehumidification amount. It is possible to control the temperature of the blown air and the air temperature according to the purpose of use. For example, (1)
Although the temperature is not so high in the rainy season and autumn rain, it is a so-called comfortable dehumidifying operation that dehumidifies while maintaining the set temperature when damp, It is a so-called mold that keeps the relative humidity at around 50% to prevent the growth of mold and dregs, so that you can sleep comfortably by lowering the humidity without reducing too much. In addition, there are (4) so-called landli dehumidification operation, which is used when drying the laundry dried in the house during the rainy season or autumn rain. Looking at the operating states of the compressor, indoor fan, and outdoor fan during dehumidifying operation for various purposes, especially in the good night / smooth dehumidifying operation, low air volume dehumidifying operation with no airflow feeling, low noise, and high dehumidifying amount is performed. In Randry dehumidification operation, especially high air flow dehumidification operation where air flow reaches a wide range and has high drying capacity, comfortable dehumidification operation and mold / dust prevention dehumidification operation, low air flow dehumidification operation and high air flow dehumidification operation Perform dehumidification operation that properly uses the operation,
In addition, for low air volume dehumidification operation and high air volume dehumidification operation,
Further, depending on the room temperature, a cooling-like operation, an isothermal-like operation, or a heating-like operation is performed.

[0003]

The conventional air conditioner that performs various dehumidifying operations as described above does not mention anything about the control method of the dehumidifying expansion device provided on the indoor side, and particularly (1) There is a problem that it is not sufficient for application to many purposes such as ~ (4), and reliable and highly efficient power saving operation cannot be performed.

[0004]

In order to achieve the above object, the present invention has a variable throttling amount between an indoor heat exchanger as a reheater and an indoor heat exchanger as a cooler during dehumidifying operation. The dehumidifying throttling device is provided, and the throttling amount of the dehumidifying throttling device is controlled so that the refrigeration cycle is properly maintained and highly efficient power-saving operation can be performed in various dehumidifying operations.

With such a configuration, the outside air temperature, the room temperature, the temperature of the indoor heat exchanger, the temperature of the compressor, etc. are detected during the dehumidifying operation, and the throttle amount of the dehumidifying expansion device is controlled so that the refrigeration cycle becomes appropriate. As a result, an air conditioner having excellent reliability and capable of highly efficient power saving operation can be obtained.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a system diagram of a refrigerating cycle of an air conditioner according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of a PAD of an operation control method according to an embodiment of the present invention, and FIG. 3 is an optimum during dehumidifying operation. FIG. 4 is an explanatory diagram showing an example of a target temperature value, and FIG. 4 is a diagram showing an example of an indoor heat exchanger. The air conditioner of this embodiment is shown in FIG.
It is configured as shown in FIG. In FIG. 1, 1 is a compressor, 2
Is a four-way valve, 3 is an outdoor heat exchanger, 4 is a cooling / heating expansion valve, 5a and 5b are indoor heat exchangers divided into two, 6 is a dehumidification expansion valve, 7 is an outdoor fan, and 8 is an outdoor fan motor. , 9
Is an indoor fan, 10 is an indoor fan motor, 11 and 12 are arrows indicating the wind directions inside and outside the room, and 13, 14 and 1, respectively.
5, 16 are temperature sensors for detecting the temperature of each device in the refrigeration cycle, 17 is an outside air temperature sensor, 18 is an indoor temperature sensor,
Reference numeral 19 is an indoor humidity sensor, which is a sensor for detecting air temperature and humidity. Further, the compressor 1, the outdoor fan motor 8, and the indoor fan motor 10 can control the number of revolutions, the expansion valve 4 for cooling / heating and the expansion valve 6 for dehumidification can be changed in throttle amount, and the distribution resistance of the flow resistance in the fully opened state can be changed. It uses few electric expansion valves.

With the above cycle configuration, during cooling and heating operations, the dehumidifying expansion valve 6 is fully opened, the throttle amount of the cooling and heating expansion valve 4 is properly controlled, and various operating conditions and operating modes are used. Performs highly reliable power saving operation with an optimal refrigeration cycle. In the dehumidifying operation, the four-way valve 2 is switched in the same manner as in the cooling operation, and the refrigerant is compressed by the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the cooling / heating expansion valve 4, the indoor heat exchanger 5.
A, the dehumidification expansion valve 6, the indoor heat exchanger 5b, the four-way valve 2, and the compressor 1 are circulated in this order. Here, the cooling / heating expansion valve 4 is fully opened, so that the outdoor heat exchanger 3 serves as an upstream condenser, the indoor heat exchanger 5a serves as a downstream condenser, and the indoor heat exchanger 5b serves as an evaporator. Set. Then, when the indoor air is made to flow by the indoor fan 9 as shown by the arrow 12, the air is cooled and dehumidified by the evaporator, that is, the indoor heat exchanger 5b acting as a cooler, and then the condenser on the downstream side, that is, It is heated again by the indoor heat exchanger 5a serving as a heater and blown out into the room.

In this case, the temperatures and capacities of the cooler 5b and the reheater 5a are adjusted by controlling the rotational speeds of the compressor 1, the outdoor fan 7 and the indoor fan 9 and the throttle amount of the dehumidifying expansion valve 6. Finally, the indoor temperature and humidity can be widely controlled according to the purpose of use. Here, as shown in FIG. 2, room temperature control is prioritized over humidity control during dehumidification operation.
(1) The rotation speed Nc of the compressor 1 is controlled based on the difference between the room temperature Ti detected by the room temperature sensor 18 and the target room temperature Ti0, and (2) the rotation speed Nof of the outdoor fan 7 is detected by the room temperature sensor 18. The temperature Tch detected by the compressor temperature sensor 13 and the target compressor temperature Tch0 (for example, FIG. 3) are controlled based on the difference between the room temperature Ti and the target room temperature Ti0. (4) The control is performed on the basis of the difference in the optimum compressor head temperature), and as the humidity control, (4) the rotation speed Nif of the indoor fan 10 is set to the temperature Te detected by the indoor heat exchanger temperature sensor 15. Control based on the difference between the target indoor heat exchanger temperature Te0, and (5) the difference between the temperature Te detected by the indoor heat exchanger temperature sensor 15 and the target indoor heat exchanger temperature Te0 for the rotation speed Nc of the compressor 1. To control based on Ri, in various conditions of use and operation mode, the power consumption can be operated with excellent reliability. still,
Although the cooler 5b and the reheater 5a are arranged on the upstream side and the downstream side of the wind in the embodiment, the cooler 5b is on the lower side as shown in FIG.
The same effect can be obtained by vertically arranging the indoor heat exchangers with the reheater 5a arranged on the upper side.

[0010]

According to the air conditioner of the present invention, by optimally controlling the throttle amount of the expansion valve for dehumidification during the dehumidifying operation, the range of its use is greatly expanded, and various operating conditions and operating modes are provided. Thus, it is possible to provide an air conditioner that is highly reliable and capable of highly efficient power saving operation.

[Brief description of the drawings]

FIG. 1 is a system diagram of an air conditioner that is an embodiment of the present invention.

FIG. 2 is a PAD explanatory diagram of a control method during a dehumidifying operation.

FIG. 3 is a characteristic diagram showing a target value of an optimum temperature during dehumidifying operation.

FIG. 4 is an explanatory diagram showing an example of an indoor heat exchanger.

FIG. 5 is a system diagram showing a configuration of an air conditioner according to a conventional technique.

[Explanation of symbols]

 1 ... Compressor, 2 ... Four-way valve, 3 ... Outdoor heat exchanger, 4 ... Cooling / heating expansion valve, 5a, 5b ... Indoor heat exchanger, 6 ... Dehumidification expansion valve, 7 ... Outdoor fan, 8 ... Outdoor Fan motor, 9 ... Indoor fan, 10 ... Indoor fan motor.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Sou Morimoto 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Hitachi Co., Ltd.

Claims (5)

[Claims] 1. An air-conditioning air conditioner including a compressor for controlling the number of revolutions, a four-way valve, an indoor heat exchanger, an electric expansion valve, and an outdoor heat exchanger, wherein the indoor heat exchanger is a cooler and reheats. An electric expansion valve is provided between the recuperator and the cooler and the reheater,
At the time of dehumidifying operation, controlling the four functions of the rotation speed of the compressor, the indoor fan, the rotation speed of the outdoor fan, and the expansion valve throttle amount, and adjusting the temperature and capacity of the cooler and the reheater to set room temperature, An operation control method for an air conditioner, characterized by efficiently obtaining a set humidity. 2. An air-conditioning air conditioner including a compressor for controlling the number of revolutions, a four-way valve, an indoor heat exchanger, a motor-operated expansion valve, and an outdoor heat exchanger, wherein the indoor heat exchanger is a cooler and a reheater. A motor and an electric expansion valve between the cooler and the reheater,
During the dehumidification operation, the rotation speed of the compressor and the rotation speed of the outdoor fan are controlled based on the difference between the room temperature detected by the indoor temperature sensor and the target room temperature, and the throttle amount of the expansion valve for dehumidification is controlled by the compressor temperature sensor. A method for controlling the operation of an air conditioner, characterized in that control is performed based on the difference between the temperature detected by and the target compressor temperature so that each target temperature is reached. 3. An air conditioner including a compressor for controlling the number of revolutions, a four-way valve, an indoor heat exchanger, an electric expansion valve, and an outdoor heat exchanger, wherein the indoor heat exchanger is a cooler and a reheater. A motor and an electric expansion valve between the cooler and the reheater,
In the dehumidifying operation, the number of revolutions of the compressor and the number of revolutions of the indoor fan are controlled based on the difference between the temperature detected by the indoor heat exchanger temperature sensor and the target temperature, and are controlled to reach the target humidity. And air conditioner operation control method. 4. An air-conditioning air conditioner including a compressor for controlling the number of revolutions, a four-way valve, an indoor heat exchanger, an electric expansion valve, and an outdoor heat exchanger, wherein the indoor heat exchanger is a cooler and a reheater. A motor and an electric expansion valve between the cooler and the reheater,
During dehumidification operation, the rotation speed of the compressor and the rotation speed of the outdoor fan are controlled based on the difference between the room temperature detected by the indoor temperature sensor and the target room temperature, and the throttle amount of the expansion valve for dehumidification is controlled by the compressor temperature sensor. Controlling based on the difference between the detected temperature and the target compressor temperature, while controlling to reach each target temperature, the rotation speed of the compressor and the indoor fan rotation speed,
An operation control method for an air conditioner, characterized in that control is performed on the basis of a difference between a temperature detected by the indoor temperature sensor and a target temperature so as to attain a target humidity. 5. An air-conditioning air conditioner including a compressor for controlling the number of revolutions, a four-way valve, an indoor heat exchanger, an electric expansion valve, and an outdoor heat exchanger, wherein the indoor heat exchanger is a cooler and a reheater. An electric expansion valve is provided between the cooler and the cooler, and the reheater, and the compressor rotation speed and the outdoor fan rotation speed during dehumidification operation, and the difference between the room temperature detected by the indoor temperature sensor and the target room temperature Room temperature control to control the throttle amount of the dehumidification expansion valve based on the difference between the temperature detected by the compressor temperature sensor and the target compressor temperature to reach each target temperature. , The compressor rotation speed and the indoor fan rotation speed are controlled based on the difference between the temperature detected by the indoor heat exchanger temperature sensor and the target temperature, and the humidity control is controlled to reach the target humidity. A method for controlling the operation of an air conditioner, which is characterized in that