JP2010249378A - Air conditioning equipment and its operation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily improve heating capacity especially in winter in an air conditioning facility. <P>SOLUTION: The air conditioning facility 1 makes outside air OA pass through an outdoor air conditioning unit 10 to supply the air to an indoor space 13. The outdoor air conditioning unit 10 is provided with a heat exchanger 25 for heating, a heat exchanger 26 for cooling, and a blower 27 for making the outside air OA thermally contact the heating heat exchanger 25 with the cooling heat exchanger 26 to supply the air to the indoor space 13. The air conditioning facility 1 is equipped with a water heater 30 for supplying hot water to the heating heat exchanger 25 and a heat source machine 40 for supplying coolant to the cooling heat exchanger 26. When the temperature of the outside air OA is within a predetermined low-temperature range, the facility is in a heating operation mode, and hot water is supplied from the water heater 30 to the heating heat exchanger 25. When the temperature of the outside air OA is within a predetermined high-temperature range, the facility is in a cooling operation mode, and the coolant is supplied from the heat source machine 40 to the cooling heat exchanger 26. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air conditioning facility capable of heating operation and an operation method thereof.

  For example, air conditioning equipment installed in a medium-sized building is known. Patent Literature 1 discloses an air conditioning facility configured to blow out air adjusted to a predetermined temperature by a heat source machine from an indoor unit into the room.

  In addition, the air-conditioning equipment of this patent document 1 also shows the structure which supplies hot water from a water heater to a heat source machine, and removes the frost attached to the heat source machine. Moreover, as a thing using a hot water heater, the hot water heating which supplies hot water from a hot water heater to the hot water heating piping installed in the heating object location is disclosed by patent document 2. FIG. Patent Document 3 discloses a hot water heater that supplies hot water from a water heater to an air conditioner or a hot water mat. Furthermore, Patent Literature 4 discloses an air conditioner that supplies hot water from a water heater to a floor heating device or a wall heating device.

JP-A-7-260294 JP 2006-292309 A JP 2002-295844 A JP 2008-25864 A

  However, the conventional air conditioning equipment has a low heating capacity especially in winter, and some auxiliary heating is required in addition to the air conditioning equipment in cold districts. In addition, if the electrical output of the heater built in the heat source device is increased in order to improve the heating capacity, there is a problem that the equipment cost increases and a large installation space for the heat source device is required.

  This invention is made | formed in view of the said subject, and it aims at improving easily the heating capability in winter especially in an air-conditioning installation.

  In order to solve the above-described problems, according to the present invention, air conditioning equipment that supplies outside air to an indoor space by passing the outside air is provided, and the external air conditioner includes a heat exchanger for heating, a cooling device A heat exchanger for heating, and a blower for bringing the outside air into thermal contact with the heat exchanger for heating and the heat exchanger for cooling and supplying the indoor space to the indoor space. There is provided an air conditioner including a hot water supply device that supplies the heat and a heat source device that supplies a refrigerant to the cooling heat exchanger.

  In this air conditioning equipment, a sensor that measures the temperature of the outside air, a hot water control valve that controls the supply of hot water to the heating heat exchanger, and a refrigerant supply to the cooling heat exchanger are controlled. You may have a control apparatus which controls the said control valve for hot water and the said control valve for refrigerant | coolants based on the control temperature for refrigerant | coolants and the measured temperature of the said sensor.

  Further, according to the present invention, the operating method of the air-conditioning equipment for passing the outside air through the external air conditioner, bringing the outside air into thermal contact with the heat exchanger for heating and the heat exchanger for cooling, and supplying the air to the indoor space When the temperature of the outside air is in the predetermined low temperature range, the heating operation mode is set, hot water is supplied from the water heater to the heat exchanger for heating, and the temperature of the outside air is in the predetermined high temperature range. In this case, there is provided a method for operating an air conditioning facility in which the cooling operation mode is set and the refrigerant is supplied from the heat source unit to the cooling heat exchanger.

  In this operation method, when the temperature of the outside air is an intermediate temperature range between the low temperature range and the high temperature range, the outside air cooling operation mode is set, and hot water from the water heater to the heating heat exchanger is set. The supply and the supply of the refrigerant from the heat source unit to the cooling heat exchanger may both be stopped. In addition, an anti-freezing operation mode in which supply of air to the indoor space is stopped, hot water is supplied from the water heater to the heat exchanger for heating, and refrigerant is supplied from the heat source device to the heat exchanger for cooling. You may have. In the freeze prevention operation mode, the refrigerant may be supplied to the cooling heat exchanger without cooling the refrigerant in the heat source unit.

  ADVANTAGE OF THE INVENTION According to this invention, a warming operation can be performed by supplying warm water from a water heater to a heat exchanger for heating built in an external air conditioner. Since the heating operation can be performed using the hot water of the water heater, the heating capacity can be easily improved particularly in winter. For this reason, equipment cost can be kept low and the installation space of a heat source machine can also be made small.

  When the temperature of the outside air is in the intermediate temperature range between the low temperature range and the high temperature range, the hot water is supplied from the water heater to the heating heat exchanger, and from the heat source device to the cooling heat exchanger. By setting the outside air cooling operation mode in which all the refrigerant supply is stopped, energy saving is achieved, running cost is reduced, and global warming is prevented. Also, especially in severe winters, freeze-off operation stops supplying air to the indoor space, supplies hot water from the water heater to the heat exchanger for heating, and supplies refrigerant from the heat source unit to the heat exchanger for cooling. By performing the mode, freezing in each heat exchanger and piping can be avoided.

It is explanatory drawing of the air-conditioning equipment concerning this Embodiment. It is explanatory drawing of the relationship between each operation mode and a temperature range. It is a graph which shows the relationship between outside temperature and the opening degree of the control valve for refrigerant | coolants. It is a graph which shows the relationship between the open air temperature and the opening degree of the hot water control valve (three-way valve). It is explanatory drawing of freezing prevention operation mode. It is explanatory drawing of the modification of the hot water piping connected to the heat exchanger for heating. It is explanatory drawing of embodiment which connected the several water heater to the hot water piping in parallel.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

As shown in FIG. 1, the air-conditioning equipment 1 according to this embodiment allows the outside air OA to pass through the external air conditioner 10, and the supply air SA having a predetermined temperature is supplied to the inside of the building 12 through the air supply duct 11. In this configuration, the indoor space 13 is supplied. A temperature sensor 14 is attached to the air supply duct 11. Temperature sensor 14 measures the temperature T _S of the supply air SA to be supplied to the indoor space 13, the temperature T _S of the temperature sensor 14 with the measured supply air SA is the controller 15 which controls the entire air conditioning 1 Entered.

An external air intake duct 20 is connected to the external air conditioner 10, and external air OA is taken into the external air conditioner 10 through the external air intake duct 20. A temperature sensor 21 and a motor damper 22 are attached to the outside air intake duct 20. Temperature sensor 21 measures the temperature T _O of the outside air OA that is incorporated in the outer conditioner 10, the temperature T _O of the measured ambient air OA at this temperature sensor 21 is input to the control unit 15. The opening and closing of the motor damper 22 is controlled by the control device 15.

  Inside the external air conditioner 10, a heat exchanger 25 for heating, a heat exchanger 26 for cooling, and a blower 27 are provided. With the operation of the blower 27, the outside air OA is taken into the external air conditioner 10 and brought into thermal contact with the heat exchanger 25 for heating and the heat exchanger 26 for cooling. As a result, the temperature-adjusted outside air OA becomes the supply air SA and is supplied to the indoor space 13. The operation of the blower 27 is controlled by the control device 15.

  Hot water heated by the water heater 30 is circulated and supplied to the heat exchanger 25 for heating via the hot water pipe 31. As the water heater 30, for example, an instantaneous gas water heater or a hot water storage water heater that uses gas, electricity or the like as a heat source is used. The hot water pipe 31 is provided with a pump 32, and the hot water is circulated from the water heater 30 to the heat exchanger 25 for heating by the operation of the pump 32. In addition, a bypass path 33 that bypasses the heat exchanger 25 for heating is branched and connected to the hot water pipe 31, and the downstream end of the bypass path 33 supplies hot water to the heat exchanger 25 for heating. The hot water pipe 31 is joined and connected via a three-way valve 34 as a hot water control valve for controlling. By opening and closing the three-way valve 34, it is possible to switch between a state in which hot water is passed through the heat exchanger 25 for heating and a state in which hot water is passed through the bypass path 33 without passing through the heat exchanger 25 for heating. Further, by adjusting the opening degree of the three-way valve 34, the ratio of the flow rate of hot water that passes through the heat exchanger 25 and the flow rate of hot water that passes through the bypass path 33 can be changed. The water heater 30, the pump 32, and the three-way valve 34 are all controlled by the control device 15.

  Refrigerant is circulated and supplied to the heat exchanger 26 for cooling through a refrigerant pipe 41 from a heat source device 40 such as a heat pump chiller having a cooling function. The heat source device 40 is disposed outdoors such as a rooftop or a garden of the building 12, for example. For example, cold water is used as the refrigerant that is circulated and supplied to the cooling heat exchanger 26. The refrigerant pipe 41 is provided with a pump 42 and a refrigerant control valve 43. With the operation of the pump 42, the refrigerant cooled by the heat source device 40 is circulated and supplied to the cooling heat exchanger 26 through the refrigerant pipe 41. Further, by adjusting the opening degree of the refrigerant control valve 43, the flow rate of the refrigerant passing through the cooling heat exchanger 26 can be changed. The heat source device 40, the pump 42, and the refrigerant control valve 43 are all controlled by the control device 15.

  In the air conditioning equipment 1 configured as described above, as shown in FIG. 2, when the outside air temperature is 19 ° C. or higher, the cooling operation mode is set in the high temperature range, and when the outside air temperature is 15 ° C. or lower. An example will be described in which the heating operation mode is set in the low temperature range and the outside air cooling operation mode is set in the intermediate temperature range when the outside air temperature is 15 to 19 ° C.

First, the blower 27 provided in the external air handler 10 is operated by an instruction from the control device 15, and the air conditioning operation by the air conditioning equipment 1 is started. Although the blower 27 and the motor damper 22 may be interlocked and interlocked, in this embodiment, the motor damper 22 is opened by a command from the control device 15. Further, when the outside air OA is taken into the external air conditioner 10 through the outside air intake duct 20, the temperature T _{O of the} outside air OA measured by the temperature sensor 21 is input to the control device 15.

Here, if the high temperature range the temperature T _O is above 19 ° C. of outdoor air OA, the cooling operation mode is performed. In the case of the cooling operation mode, the heat source device 40 is operated and the refrigerant is cooled by a command from the control device 15. Further, in response to a command from the control device 15, the pump 42 is operated and the refrigerant control valve 43 is opened, so that the refrigerant cooled by the heat source device 40 passes through the refrigerant pipe 41 to the cooling heat exchanger 26. Circulated. When performing the cooling operation mode, both the water heater 30 and the pump 32 are stopped.

Thus, when the cooling operation mode is performed, the outside air OA taken into the external air conditioner 10 by the operation of the blower 27 is brought into thermal contact with the cooling heat exchanger 26 and cooled. As a result, the outside air OA cooled to a desired temperature becomes the supply air SA and is supplied to the indoor space 13. The temperature T _S of the supply air SA to be supplied to the indoor space 13 is input to the control device 15 is measured by the temperature sensor 14.

Furthermore, when performing the cooling operation mode in this way, proportional control of the cooling capacity by the heat exchanger 26 for cooling is performed. That is, in accordance with a command from the controller 15, as shown in FIG. 3, in proportion to the difference between the air-conditioning target temperature T and the ambient temperature T _O of the interior space 13, the opening degree of the refrigerant control valve 43 is adjusted . For example, when the difference between the air-conditioning target temperature T and the ambient temperature T _O of the interior space 13 is small, in accordance with a command from the controller 15, the opening degree of the refrigerant control valve 43 is reduced, thereby, the heat of the cooling The amount of refrigerant supplied to the exchanger 26 is reduced. As a result, the cooling capacity by the heat exchanger 26 for cooling is suppressed. On the other hand, when the difference between the air-conditioning target temperature T and the ambient temperature T _O of the interior space 13 is large, in accordance with a command from the controller 15, the opening degree of the refrigerant control valve 43 is increased, thereby, the heat of the cooling The amount of refrigerant supplied to the exchanger 26 is increased. As a result, the cooling capacity of the cooling heat exchanger 26 is increased.

Thus, the outside air OA is always cooled to a desired temperature by controlling the cooling capacity of the cooling heat exchanger 26 in proportion to the difference between the air conditioning target temperature T and the outside air temperature T _O in the indoor space 13. Then, the supply air SA having a constant temperature is supplied to the indoor space 13. The cooling capacity of the cooling heat exchanger 26 can also be achieved by controlling the output of the pump 42 and the heat source device 40.

On the other hand, the temperature T _O of the outside air OA is as long as the low temperature range of 15 ℃ or less, the heating operation mode is performed. In the case of the heating operation mode, the water heater 30 is operated by the command from the control device 15 and the hot water is heated. Further, in response to a command from the control device 15, the pump 32 is operated, the three-way valve 34 is opened, and the hot water is passed through the heat exchanger 25 for heating. Thereby, the hot water heated by the water heater 30 is circulated and supplied to the heat exchanger 25 for heating through the hot water pipe 31. In addition, when performing heating operation mode, both the heat source machine 40 and the pump 42 are stopped.

Thus, when the heating operation mode is performed, the outside air OA taken into the external air conditioner 10 by the operation of the blower 27 is brought into thermal contact with the heat exchanger 25 for heating and is heated. As a result, the outside air OA heated to a desired temperature becomes the supply air SA and is supplied to the indoor space 13. The temperature T _S of the supply air SA to be supplied to the indoor space 13 is input to the control device 15 is measured by the temperature sensor 14.

Further, even when the heating operation mode is performed as described above, proportional control of the temperature raising capability by the heat exchanger 25 for heating is performed. That is, in accordance with a command from the controller 15, as shown in FIG. 4, in proportion to the difference between the air-conditioning target temperature T and the ambient temperature T _O of the interior space 13, the opening degree of the three-way valve 343 is adjusted. For example, when the difference between the air-conditioning target temperature T and the ambient temperature T _O of the interior space 13 is small, in accordance with a command from the controller 15, the opening degree of the three-way valve 34 is reduced, thereby, the heat exchanger for heating The amount of hot water supplied to 25 is reduced, and the amount of hot water passed through the bypass path 33 is increased. As a result, the temperature raising capability by the heat exchanger 25 for heating is suppressed. On the other hand, when the difference between the air-conditioning target temperature T and the ambient temperature T _O of the interior space 13 is large, in accordance with a command from the controller 15, the opening degree of the three-way valve 34 is large, thereby, the heat exchanger for heating The amount of hot water supplied to 25 is increased, and the amount of hot water passed through the bypass path 33 is reduced. As a result, the heating capability by the heat exchanger 25 for heating is enhanced.

In this way, the temperature rise capability of the heat exchanger 25 for heating is controlled in proportion to the difference between the air conditioning target temperature T of the indoor space 13 and the outside air temperature T _O , so that the outside air OA is always at a desired temperature. The temperature is raised, and the supply air SA having a constant temperature is supplied to the indoor space 13. Note that the heating capability of the heat exchanger 25 for heating can also be achieved by controlling the output of the pump 32 and the water heater 30.

On the other hand, the temperature T _O of the outside air OA is as long as the intermediate temperature range of 15 to 19 ° C., outside air cooling operation mode is performed. In the outside air cooling operation mode, the operation of the heat source device 40 is stopped by the command from the control device 15, and the refrigerant is not cooled. Further, the operation of the water heater 30 is stopped by the command from the control device 15, and the hot water is not heated. Furthermore, the operation of the pumps 42 and 32 is also stopped by a command from the control device 15.

For this reason, when the outside air cooling operation mode is performed, the outside air OA taken into the external air conditioner 10 by the operation of the blower 27 is raised by the heating heat exchanger 25 and the cooling heat exchanger 26. It is not cooled and passes through the external air conditioner 10 without adjusting the temperature. Thus, the outside air OA is directly supplied to the indoor space 13 as the supply air SA. The temperature T _S of the supply air SA to be supplied to the indoor space 13 is input to the control device 15 is measured by the temperature sensor 14.

In addition, in this air conditioner 1, when the temperature T _{O of the} outside air OA is in an extremely low temperature range of 4 ° C. or less, the supply of air to the indoor space 13 is stopped and the water heater 30 is used for heating. A freeze prevention operation mode is performed in which hot water is supplied to the heat exchanger 25 and refrigerant is supplied from the heat source unit 40 to the cooling heat exchanger 26.

That is, as shown in FIG. 5, when the temperature _{T O} of the outside air OA is 4 ° C. or less (Yes in step S1 in FIG. 5), the freeze prevention operation mode (step S2 in FIG. 5). The anti-freezing operation mode (the temperature T _{O of the} outside air OA is 4 ° C. or less) is within the range of the heating operation mode (the temperature T _{O of the} outside air OA is 15 ° C. or less). For this reason, in the freeze prevention operation mode, the water heater 30 is operated by the command from the control device 15 and the hot water is heated. Further, in response to a command from the control device 15, the pump 32 is operated, the three-way valve 34 is opened, and hot water is passed through the heat exchanger 25 for heating. Thereby, the hot water heated by the water heater 30 is circulated and supplied to the heat exchanger 25 for heating through the hot water pipe 31 (step S3 in FIG. 5). Further, the cooling of the refrigerant is stopped in the heat source device 40 in accordance with a command from the control device 15. However, in the freeze prevention operation mode, the pump 42 is operated, the refrigerant control valve 43 is opened, and the refrigerant is circulated and supplied to the cooling heat exchanger 26 through the refrigerant pipe 41, so that the refrigerant is frozen. It is avoided (step S4 in FIG. 5).

Thus, when the freeze prevention operation mode is performed, the outside air OA taken into the external air conditioner 10 by the operation of the blower 27 is in thermal contact with the heat exchanger 25 for heating, as in the heating operation mode. The temperature is raised. As a result, the outside air OA heated to a desired temperature becomes the supply air SA and is supplied to the indoor space 13. The temperature T _S of the supply air SA to be supplied to the indoor space 13 is input to the control device 15 is measured by the temperature sensor 14. In the freeze prevention operation mode, the operation of the blower 27 may be stopped and the supply of the supply air SA to the indoor space 13 may be stopped during a period when the heating operation is unnecessary, such as at night.

Further, even when the freeze prevention operation mode is performed in this way, proportional control of the temperature raising capability by the heat exchanger 25 for heating is performed. That is, in accordance with a command from the controller 15, as shown in FIG. 4, in proportion to the difference between the air-conditioning target temperature T and the ambient temperature T _O of the interior space 13, the opening degree of the three-way valve 343 is adjusted. For example, when the difference between the air-conditioning target temperature T and the ambient temperature T _O of the interior space 13 is small, in accordance with a command from the controller 15, the opening degree of the three-way valve 34 is reduced, thereby, the heat exchanger for heating The amount of hot water supplied to 25 is reduced, and the amount of hot water passed through the bypass path 33 is increased. As a result, the temperature raising capability by the heat exchanger 25 for heating is suppressed. On the other hand, when the difference between the air-conditioning target temperature T and the ambient temperature T _O of the interior space 13 is large, in accordance with a command from the controller 15, the opening degree of the three-way valve 34 is large, thereby, the heat exchanger for heating The amount of hot water supplied to 25 is increased, and the amount of hot water passed through the bypass path 33 is reduced. As a result, the heating capability by the heat exchanger 25 for heating is enhanced.

In this way, the temperature rise capability of the heat exchanger 25 for heating is controlled in proportion to the difference between the air conditioning target temperature T of the indoor space 13 and the outside air temperature T _O , so that the outside air OA is always at a desired temperature. The temperature is raised, and the supply air SA having a constant temperature is supplied to the indoor space 13. Note that the heating capability of the heat exchanger 25 for heating can also be achieved by controlling the output of the pump 32 and the water heater 30.

Then, when the temperature _{T O} of the outside air OA is 4 ° C. or less (Yes in step S1 in FIG. 5), the freeze prevention operation mode is maintained (Step S2~S4 in FIG. 5).

On the other hand, when the temperature _{T O} of the outside air OA exceeds 4 ° C. (No in step S1 in FIG. 5), preventing the operation mode is finished frozen (step S5 in FIG. 5).

  Thus, according to the air-conditioning equipment 1 according to this embodiment, since the heating operation can be performed using the hot water of the water heater 30, the heating capacity particularly in winter can be easily improved. By using an instantaneous gas water heater or a hot water storage water heater that uses gas, electricity, etc. as a heat source for the water heater 30, heating capacity can be improved at a relatively fixed price, so that the equipment cost can be kept low. In addition, the installation space for the heat source device can be reduced. In particular, if the water heater 30 is installed near the external air conditioner 10, there is an advantage that the hot water pipe 31 can be shortened.

  Further, by performing proportional control of the cooling capacity in the cooling operation mode and proportional control of the temperature raising capacity in the heating operation mode, the supply air SA at a constant temperature is supplied to the indoor space 13 and comfortable air conditioning is performed. Furthermore, excessive cooling and heating can be avoided, energy saving can be achieved, running costs can be reduced, and global warming can be prevented.

  In addition, when the temperature of the outside air is in an intermediate temperature range between the low temperature range and the high temperature range, supply of hot water from the water heater 30 to the heat exchanger 25 for heating and heat for cooling from the heat source device 40 By setting the outside air cooling operation mode in which all the refrigerant supply to the exchanger 26 is stopped, further energy saving can be achieved, running costs can be reduced, and global warming can be prevented.

  Further, particularly in the severe winter season, by performing a freeze prevention operation mode in which hot water is supplied from the water heater 30 to the heat exchanger 25 for heating and refrigerant is supplied from the heat source device 40 to the heat exchanger 26 for cooling, Freezing in the heat exchangers 25 and 26 and the pipes 31 and 41 can be avoided.

  As mentioned above, although an example of preferable embodiment of this invention was demonstrated, this invention is not limited to the form of illustration. It will be apparent to those skilled in the art that various changes or modifications can be made within the scope of the ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs. In the above embodiment, when the outside air temperature is 19 ° C. or higher, the cooling operation mode is set in the high temperature range, and when the outside air temperature is 15 ° C. or less, the heating operation mode is set in the low temperature range. In the case where the temperature is 15 to 19 ° C., the case where the outside air cooling operation mode is set as an intermediate temperature range has been described as an example, but each temperature range can be arbitrarily set.

  In the example shown in FIG. 6, a hot water supply bypass path 50 and a flow rate adjustment path 51 are added to the hot water pipe 31 connected to the heat exchanger 25 for heating. The upstream end of the water heater bypass path 50 is branched and connected from the hot water pipe 31 via a three-way valve 52 on the upstream side of the water heater 30. The downstream end of the water heater bypass path 50 joins and is connected to the hot water pipe 31 on the downstream side of the water heater 30. The three-way valve 52 is a wax valve whose opening degree changes depending on the temperature of the hot water. When the temperature of the hot water increases, the flow rate of the hot water to the water heater bypass path 50 relatively increases, and the hot water to the water heater 30 is increased. When the flow rate is relatively reduced and the temperature of the hot water is lowered, the flow rate of the hot water to the water heater bypass path 50 is relatively reduced, and the flow rate of the hot water to the water heater 30 is relatively increased.

  The flow rate adjusting path 51 and the hot water pipe 31 are provided with a pair of constant flow valves 55 and 56. The flow rate ratio of the hot water flowing toward the water heater 30 and the water heater bypass path 50 and the temperature of the hot water bypassing the water heater 30 and the water heater bypass path 50 are adjusted by the opening balance of the constant flow valves 55 and 56. . In addition, a hot water reservoir 57 is connected to the hot water pipe 31, and hot water is appropriately supplied to and from the hot water reservoir 57 so that the hot water in the hot water pipe 31 is excessive or insufficient. Is to be compensated.

  According to the example shown in FIG. 6, when the temperature of the hot water is high due to the use of the wax valve for the three-way valve 52, the flow rate of the hot water to the hot water heater 30 is relatively reduced and the temperature of the hot water is low. Therefore, the flow rate of the hot water to the water heater 30 is relatively increased, and hot water having a constant temperature (for example, 60 ° C.) is always supplied to the heat exchanger 25 for heating.

  Moreover, as shown in FIG. 7, the temperature rising capability of warm water can be easily improved by connecting a plurality (three in the figure) of water heaters 30 in parallel to the warm water pipe 31. In this case, by controlling the number of operating hot water heaters 30, the temperature of the hot water can be changed and the temperature raising capability of the heat exchanger 25 for heating can be controlled.

In addition, although the example which controls the three-way valve 34 as a hot water control valve by the control apparatus 15 was demonstrated in FIG. 1, the three-way valve 34 uses a self-powered valve and is not the control by the control apparatus 15, but hot water piping 31. It is good also as self-control by the temperature of the warm water which flows through. Also in this case, the opening degree control by the temperature sensor 21 can be performed by the heat source device 40 controlling the temperature of the heat medium by the outside air temperature T _O. Further, so-called season switching may be performed in which the operation of the water heater 30 is permitted only in the winter season and the operation of the water heater 30 is prohibited in the summer season.

  The present invention is useful for air conditioning equipment installed in a medium-sized building or the like.

OA outside air SA air supply 1 air conditioning equipment 10 air conditioner 11 air supply duct 12 building 13 indoor space 13 temperature sensor 15 control device 20 outside air intake duct 21 temperature sensor 22 motor damper 25 heat exchanger 26 for heating 26 heat exchange for cooling Equipment 27 Blower 30 Water heater 31 Hot water pipe 32 Pump 33 Bypass path 34 Three-way valve 40 Heat source machine 41 Refrigerant pipe 42 Pump 43 Refrigerant control valve

Claims (6)

An air conditioner that passes outside air through an air conditioner and supplies it to the indoor space,
In the external air conditioner, outside air is brought into thermal contact with the heat exchanger for heating, the heat exchanger for cooling, and the heat exchanger for cooling and the heat exchanger for cooling to enter the indoor space. A blower to supply is provided,
An air conditioner comprising a water heater that supplies hot water to the heat exchanger for heating, and a heat source device that supplies refrigerant to the heat exchanger for cooling. A sensor that measures the temperature of the outside air, a control valve for hot water that controls supply of hot water to the heat exchanger for heating, and a control valve for refrigerant that controls supply of refrigerant to the heat exchanger for cooling The air conditioning equipment according to claim 1, further comprising a control device that controls the control valve for hot water and the control valve for refrigerant based on a measured temperature of the sensor. An operation method of an air conditioning system that allows outside air to pass through an external air conditioner, causes the outside air to come into thermal contact with a heat exchanger for heating and a heat exchanger for cooling, and supplies the air to the indoor space,
When the temperature of the outside air is in a predetermined low temperature range, it becomes a heating operation mode, hot water is supplied from the water heater to the heat exchanger for heating,
When the temperature of the outside air is in a predetermined high temperature range, the cooling operation mode is set, and the refrigerant is supplied from the heat source unit to the cooling heat exchanger. When the temperature of the outside air is an intermediate temperature range between the low temperature range and the high temperature range, the outside air cooling operation mode is set, supply of hot water from the water heater to the heat exchanger for heating, and the heat source The operation method of the air-conditioning equipment according to claim 3, wherein supply of the refrigerant from the machine to the cooling heat exchanger is stopped. 5. The air conditioner according to claim 3, further comprising an antifreezing operation mode in which hot water is supplied from the water heater to the heat exchanger for heating and refrigerant is supplied from the heat source device to the heat exchanger for cooling. Driving method. The method of operating an air conditioning facility according to claim 5, wherein in the freeze prevention operation mode, the refrigerant is supplied to the heat exchanger for cooling without cooling the refrigerant in the heat source unit.

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