JP6208506B2 - Air heat source heat pump and air conditioning method - Google Patents

Description

  The present invention relates to an air heat source heat pump and an air conditioning method.

  An air heat source heat pump for heating operation pumps up heat by exchanging heat between a refrigerant having a temperature lower than that of the outside air and the outside air using an evaporator. For this reason, when the outside air temperature decreases, the high-low pressure difference (lifting distance in terms of a pump) of the compressor to be pumped increases, and the operation efficiency decreases. In addition, when the outside air temperature is low and the outside air humidity is high, when the refrigerant temperature falls below freezing point, dew condensation water from outside air freezes on the evaporator surface, and the operation efficiency may be extremely reduced, leading to frosted operation. In this case, it is necessary to intermittently perform a defrosting operation in which frost is melted by some means.

  In order to improve the reduction in operating efficiency, an air heat source heat pump as shown in FIG. 1 has been put into practical use. This conventional air heat source heat pump 100 includes a compressor 101, a three-way valve 102, a four-way valve 103, a hot water supply heat exchanger 104, an air heat exchanger 105, a cold / hot water heat exchanger 106, and a flow rate adjustment valve 107. For example, during the heating operation of the air heat source heat pump, warm heat (heat source water) is supplied from the outside to improve the operation efficiency. Specifically, an evaporator for air heat exchange (air heat exchanger 105) and an evaporator for water heat exchange (hot water supply heat exchanger 104, cold / hot water heat exchanger 106) are installed in parallel, and both circuits are connected. Driving efficiency is improved by switching.

  Moreover, there exists a technique of patent document 1 as an air-conditioner system (air heat source heat pump) which can store heat | fever during operation | movement of an air conditioner. In the technique described in Patent Document 1, a heat exchanger is provided in a liquid pipe that joins an outdoor unit and an indoor unit, and heat is exchanged between the cold heat source sent from the cold heat source device to the heat exchanger and the liquid refrigerant in the liquid pipe, The liquid refrigerant is configured to be cooled or heated. Further, the cold heat source device includes a heat storage tank, and the heat storage medium in the heat storage tank is cooled or heated by the cooling and heating means, and is sent to the heat exchanger as a cold heat source.

JP 05-126428 A

  According to the air heat source heat pump as shown in FIG. 1, heating operation can be performed even when the heat source water temperature is as low as the outside air temperature. However, the air heat source heat pump as shown in FIG. 1 needs to be a special heat pump having two kinds of evaporators, and there is a problem that it lacks versatility. From the viewpoint of the tight supply and demand of electric power in recent years and the BCP (Business Continuity Plan), there are increasing cases of installing private generators in office buildings, but in general air heat source heat pumps that have only an evaporator for air heat exchange, Use of generator exhaust heat (co-generation) is difficult.

In the technique described in Patent Document 1, the heating capacity is improved by heating the refrigerant (liquid refrigerant) that returns from the indoor unit to the outdoor unit with warm water during the heating operation of the air heat source heat pump. However, the technique described in Patent Document 1 is a technique that assumes the heat generated by heat storage using nighttime power, and does not assume a situation where the heating amount of the liquid refrigerant greatly exceeds the heat absorption amount necessary for heating. Absent. Therefore, when the liquid refrigerant is heated excessively, its dryness (mixing ratio of gas and liquid) increases, the volume of refrigerant flowing in the liquid pipe increases, pressure loss increases, and superheat degree control by the expansion valve of the outdoor unit ( Since the refrigerant sucked into the compressor is in a gas state, there is a possibility that the control of adjusting the refrigerant circulation amount so that the temperature and the evaporation temperature become +2 to 5 ° C. may not be successful.

  The present invention uses the above-described conditions, for example, the exhaust heat of a cogeneration generator to improve the heating operation conditions of the air heat source heat pump without changing the control method of the air heat source heat pump itself. It is an object of the present invention to provide a technique for improving the heating operation efficiency without causing any trouble in the heating operation.

  The present invention employs the following means in order to solve the above-described problems. That is, the present invention is provided in an outside air temperature detecting unit that detects an outside air temperature, a pressure detecting unit that detects a refrigerant pressure at an inlet of the outdoor unit, and a refrigerant pipe between the outdoor unit and the indoor unit. Control for adjusting the flow rate of the exhaust water supplied to the refrigerant / water heat exchanger provided in the piping and the pipe through which the exhaust water supplied to the refrigerant / water heat exchanger that exchanges heat with the refrigerant flowing through the pipe The temperature of the refrigerant detected at the valve and the inlet of the outdoor unit is higher than the saturation pressure of the outside air calculated from the outside air temperature detected at the outside air temperature detecting unit. And an air heat source heat pump comprising a control unit for controlling the control valve.

In the air heat source heat pump according to the present invention, for example, when improving the heating operation condition of the air heat source heat pump using the exhaust heat of the cogeneration generator, without changing the control method of the air heat source heat pump itself, Heating operation efficiency can be improved without hindering heating operation. The control unit discharges the refrigerant pressure detected by the pressure detection unit so that the refrigerant pressure at the inlet of the outdoor unit is higher by 0 to 200 kPa than the saturation pressure of the outside temperature detected by the outside temperature detection unit. You may control the flow volume of warm water. As a result, it can be avoided that the pressure of the refrigerant at the inlet of the expansion valve is excessively lowered and hinders superheat degree control. Instead of the flow rate, the temperature of the discharged hot water may be controlled. In this case, for example, it can be realized by providing a bypass line around the control valve and performing control (bleed-in control) for mixing the return water with the outgoing water. Examples of the refrigerant include a fluorocarbon refrigerant, a CO ₂ refrigerant, and an ammonia refrigerant.

  Here, the air heat source heat pump according to the present invention includes the outdoor unit including an outdoor air heat exchanger that exchanges heat with the outside air, the indoor unit including an indoor heat exchanger that exchanges heat with the indoor air, and the outdoor unit. A refrigerant pipe that is connected to the indoor unit and through which the refrigerant flows, and a refrigerant / water heat exchanger that is provided in a refrigerant pipe between the outdoor unit and the indoor unit and exchanges heat with the refrigerant that flows through the refrigerant pipe; In the heating operation, the refrigerant / water heat exchanger may be supplied with 50 to 90 ° C. waste hot water.

In the air source heat pump according to the present invention, during the heating operation, the refrigerant temperature of the refrigerant pipe is, for example, the room temperature +5 to 15 ° C. (25 to 40 ° C.).
Heated by ˜90 ° waste water. Therefore, the power of the compressor necessary for performing the heat absorption necessary for the heating operation is reduced, and the operation efficiency can be improved as compared with the conventional technique in which the refrigerant / water heat exchanger is not provided. Further, according to the present invention, even when the amount of waste water is excessive with respect to the amount of heat absorption required for the heating operation of the air heat source heat pump, the heat exchange amount in the refrigerant / water heat exchanger is suppressed to an appropriate range and the outdoor It is possible to prevent the refrigerant pressure at the inlet of the expansion valve of the machine from excessively decreasing and to keep the superheat control without any trouble.

  Here, in the air source heat pump according to the present invention, during the cooling operation, the refrigerant pipe heat exchanger is supplied with cold water of 5 to 30 ° C. obtained by supplying waste hot water to the refrigerator. Also good. Thereby, the air source heat pump according to the present invention can improve not only the operation efficiency during the heating operation (for example, winter) but also the operation efficiency during the cooling operation (for example, summer). In addition, the hot water can be used effectively.

Here, this invention can also be specified as an air-conditioning method in the air heat source heat pump mentioned above. Specifically, the present invention detects the outside air temperature, detects the pressure of the refrigerant at the inlet of the outdoor unit, and the refrigerant pressure at the inlet of the outdoor unit is greater than the saturation pressure of the outside air calculated from the outside air temperature. An air conditioning method for adjusting a flow rate of exhaust water supplied to a refrigerant / water heat exchanger that is provided in a refrigerant pipe between the outdoor unit and the indoor unit and exchanges heat with the refrigerant flowing through the refrigerant pipe so as to be higher It is.

  According to the air conditioning method of the present invention, for example, when the heating operation conditions of the air heat source heat pump are improved by utilizing the exhaust heat of the cogeneration generator, the control method of the air heat source heat pump itself is not changed. The heating operation efficiency can be improved without causing any trouble in the heating operation. Further, according to the present invention, even when the amount of waste water is excessive with respect to the amount of heat absorption required for the heating operation of the air heat source heat pump, the heat exchange amount in the refrigerant / water heat exchanger is suppressed to an appropriate range and the outdoor It is possible to prevent the refrigerant pressure at the inlet of the expansion valve of the machine from excessively decreasing and to keep the superheat control without any trouble. In addition, 50-90 degreeC waste-water can be supplied to the heat exchanger for refrigerant pipes at the time of heating operation. In this case, even when the outside air temperature decreases, the pressure loss in the outdoor unit can be suppressed. Therefore, the operating efficiency is higher than that in the conventional technique in which the refrigerant pipe heat exchanger is not provided in the refrigerant pipe between the outdoor unit and the indoor unit. Can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, heating operation efficiency can be improved, without making a change in the control method of the air heat source heat pump itself, without causing trouble in heating operation.

An example of the air heat source heat pump which concerns on a prior art is shown. The piping system figure at the time of the heating operation of the air heat source heat pump which concerns on embodiment is shown. The piping system figure at the time of the heating operation of the air heat source heat pump which concerns on a comparative example is shown. The ph diagram at the time of heating operation is shown. The piping system figure at the time of air_conditionaing | cooling operation of the air heat source heat pump which concerns on embodiment is shown. The piping system figure at the time of air_conditionaing | cooling operation of the air heat source heat pump which concerns on a comparative example is shown. The ph diagram at the time of cooling operation is shown. The example of operation control of heating operation is shown.

  Next, embodiments of the present invention will be described with reference to the drawings. The embodiment described below is merely an example, and the present invention is not limited to the embodiment described below.

<Heating operation>
FIG. 2 shows a piping system diagram at the time of heating operation of the air source heat pump according to the first embodiment. The air heat source heat pump 200 according to the first embodiment includes an outdoor unit 210, an indoor unit 220, a refrigerant pipe 230, a refrigerant / water heat exchanger 240, a pipe 250, an outside air temperature sensor 260, a low pressure sensor 270, a water control valve 280, control. A device 290 is provided.

  The outdoor unit 210 is installed outside and exchanges heat with the outside air. Specifically, the outdoor unit 210 includes an expansion valve 211, a fan 212, an evaporator 213, a compressor 214, and the like. During the heating operation, in the outdoor unit 210, the low-temperature refrigerant (gas-liquid two-phase flow refrigerant: for example, −5 to + 5 ° C.) and the outside air (for example, 5 ° C.) whose pressure has dropped after passing through the expansion valve 211 are evaporated. Heat is exchanged at 213, the refrigerant absorbs heat from the outside air, becomes low-pressure gas, is compressed by the compressor 214, and high-pressure high-temperature gas refrigerant (for example, 70 to 100 ° C.) is sent to the indoor unit 220.

The indoor unit 220 exchanges heat with room air. Specifically, the indoor unit 220 includes a condenser 221, a fan 222, an expansion valve 223, and the like. During the heating operation, the indoor unit 220 has the outdoor unit 210.
After being condensed in the condenser 221, the high-temperature gas refrigerant (from 70 to 100 ° C.) is absorbed by the indoor air and becomes liquid refrigerant (eg 40 to 50 ° C.). It is sent to the water heat exchanger 240. In the present embodiment, two indoor units 220 are installed, but the number of indoor units 220 may be one, or three or more.

The refrigerant pipe 230 is connected to the outdoor unit 210 and the indoor unit 220, and the refrigerant flows. Examples of the refrigerant include a fluorocarbon refrigerant, a CO ₂ refrigerant, and an ammonia refrigerant.

  The refrigerant / water heat exchanger 240 (corresponding to the refrigerant pipe heat exchanger of the present invention) is provided in the refrigerant pipe 230 between the outdoor unit 210 and the indoor unit 220. Further, a pipe 250 through which hot water (for example, 50 to 90 ° C.) flows passes through the refrigerant / water heat exchanger 240. The refrigerant / water heat exchanger 240 exchanges heat between the refrigerant and hot water. The hot water is preferably the waste water from the generator or the waste water from the factory that uses the boiler. During the heating operation, the liquid refrigerant (for example, 40 to 50 ° C.) sent from the indoor unit 220 is heated with hot water by passing through the refrigerant / water heat exchanger 240, and a high-pressure gas-liquid two-layer refrigerant ( For example, the pressure decreases by flowing through the refrigerant pipe 230 and is sent to the expansion valve 211 of the outdoor unit 210.

  The pipe 250 is connected to a generator (not shown), and exhaust hot water (for example, 50 to 90 ° C.) using the exhaust heat of the generator flows.

  An outside air temperature sensor 260 (corresponding to an outside air temperature detector of the present invention) is installed outside the room and detects the outside air temperature. The outside temperature sensor 260 is electrically connected to the control device 290, and the detected outside temperature is sent to the control device 290. The outside air temperature sensor 260 can be configured by an existing temperature sensor.

  The low-pressure sensor 270 (corresponding to the pressure detection unit of the present invention) is installed at the inlet of the outdoor unit 210, in other words, upstream of the expansion valve 211, and the refrigerant at the inlet of the outdoor unit 210 (near the expansion valve 211). Detect pressure. The low pressure sensor 270 is electrically connected to the control device 290, and the detected pressure is sent to the control device 290. The low pressure sensor 270 can also be configured by an existing low pressure sensor.

  The water control valve 280 is installed in the pipe 250 and adjusts the flow rate of the exhaust warm water 0 supplied to the refrigerant / water heat exchanger 240. The water control valve 280 is configured by, for example, an electromagnetic valve, and is electrically connected to the control device 290, and the opening degree is controlled by the control device 290.

The control device 290 controls the water control valve 280 so that the refrigerant pressure detected by the low pressure sensor 270 at the inlet of the outdoor unit 210 is 0 to 200 kPa higher than the saturation pressure of the outside temperature detected by the outside temperature sensor 260. To control the opening degree. The control device 290 includes a CPU (Central Processing Unit), a memory, a storage device, and the like.
U controls the opening of the water control valve in accordance with a program developed in the memory.

Here, FIG. 3 shows a piping system diagram at the time of heating operation of the air heat source heat pump according to the comparative example. In addition, about the structure similar to this embodiment, the same code | symbol is attached | subjected and description is omitted. The piping system at the time of heating operation of the air heat source heat pump according to the comparative example is an example of a conventional piping system and does not include the refrigerant / water heat exchanger 240. Accordingly, the piping 250, the outside air temperature sensor 260, the low pressure sensor 270, the water control valve 280, and the control device 290 are also not provided. Therefore, the gas-liquid two-phase flow refrigerant after passing through the expansion valve 211 is, for example, −10 ° C., and the temperature difference (for example, 15 ° C.) from the outside air (for example, 5 ° C.) is the temperature difference of the above-described embodiment. (For example, 0 to 10 ° C.). Therefore, the temperature (for example, −5 ° C.) of the gas refrigerant after passing through the evaporator 213 is lower than the temperature (for example, 0 to 5 ° C.) of the gas refrigerant in the above-described embodiment.

  FIG. 4 shows a ph diagram during heating operation. In FIG. 4, the horizontal axis represents specific enthalpy, the vertical axis represents absolute pressure, the solid line represents a comparative example, and the dotted line represents an embodiment. As in the comparative example, generally, the refrigerant (C) condensed in the indoor unit 220 is reduced in pressure by the expansion valve 211 of the outdoor unit 210 to become a low-pressure gas-liquid two-phase flow (F), and from the outside air by the evaporator 213. It absorbs heat and becomes low-pressure gas (G) and is sucked into the compressor 214. On the other hand, in the embodiment, the refrigerant (C) condensed in the indoor unit 220 first passes through the refrigerant / water heat exchanger 240 and is heated with warm water to become a high-pressure gas-liquid two-phase flow (D). Then, the pressure is reduced in the refrigerant pipe 230 (E), and further the pressure is reduced in the expansion valve 211 of the outdoor unit 210 to become a low-pressure gas-liquid two-phase flow (F). In this embodiment, since the specific enthalpy of the refrigerant (F) at the inlet of the evaporator 213 is higher than that of the comparative example, the refrigerant can be completely gasified without reducing the refrigerant temperature of the evaporator 213 as much as that of the outside air. . For this reason, the evaporation pressure is increased, the enthalpy difference at the inlet / outlet of the compressor 214 is reduced, and the operation efficiency is improved.

  Here, it is necessary to pay attention to an increase in pressure drop (between C and E) caused by flowing a gas-liquid two-phase flow refrigerant having an increased volume through a refrigerant pipe 230 that is generally designed with a liquid refrigerant flow rate. is there. When the refrigerant is excessively heated by the refrigerant / water heat exchanger 240, simply by heating the return refrigerant of the indoor unit, the pressure of the refrigerant (E) at the inlet of the expansion valve 211 of the outdoor unit 210 is too low, and the expansion valve There is a concern that the superheat control of 211 cannot be performed. The superheat degree control is a control that ensures a superheat degree of the compressor inlet refrigerant (G) of 2 to 5 ° C. so that the complete gas refrigerant returns to the compressor 214, and is an endothermic heat from the outside air in the evaporator 213. The refrigerant circulation amount is controlled to such an extent that the refrigerant can be completely gasified. In the embodiment, the control device 290 detects the outside air temperature by the outside air temperature sensor 260, calculates the saturation pressure of the outside air temperature, and the pressure of the inlet refrigerant (E) of the expansion valve 211 detected by the low pressure sensor 270 is this. The amount of hot water heating is controlled to be 0 to 200 kPa higher than the value. For example, the control device 290 controls the opening degree of the water control valve 280 provided on the upstream side in the hot water flow of the refrigerant / water heat exchanger 240.

  In this embodiment, the pressure loss given by the expansion valve 211 in the heating operation of the air heat source heat pump 200 of the comparative example is divided into the pressure loss in the refrigerant pipe 230 and the pressure loss given by the expansion valve 211, and the total pressure loss is further reduced. It can be said that.

<Cooling operation>
When the air heat source heat pump according to the above-described embodiment is introduced into an air-cooled building mulch (also referred to as “billmaru”), cold water from the outside is supplied to the refrigerant / water heat exchanger 240 during the cooling operation in summer, thereby improving the cooling operation efficiency It can also be made. Here, FIG. 5 shows a piping system diagram at the time of cooling operation of the air heat source heat pump according to the embodiment. In addition, about the structure similar to the piping system diagram at the time of heating operation, the same code | symbol is attached | subjected and description is omitted.

  In the outdoor unit 210, during the cooling operation, the gas refrigerant (for example, 60 to 90 ° C.) compressed by the compressor 214 is condensed by the condenser 213 (corresponding to the evaporator during the heating operation), and the heat of the gas refrigerant is increased. It is absorbed in contact with outside air (for example, 30 ° C.), becomes a liquid refrigerant (for example, 40 to 45 ° C.), and is sent to the refrigerant / water heat exchanger 240.

  In the refrigerant / water heat exchanger 240, during the cooling operation, the liquid refrigerant (for example, 40 to 45 ° C.) sent from the outdoor unit 210 is cooled with cold water by passing through the refrigerant / water heat exchanger 240. It becomes a liquid refrigerant (for example, 10 to 35 ° C.) and is sent to the indoor unit 220.

In the indoor unit 220, during the cooling operation, the refrigerant whose pressure has dropped through the expansion valve 223 and the room air exchange heat with the evaporator 221 (corresponding to the condenser during the heating operation), and the refrigerant heats from the room air. Into the low-pressure gas, and the outdoor unit 21 as a gas refrigerant (for example, 15 to 20 ° C.)
0 to the compressor 214.

  The pipe 250 is connected to a cooler (not shown), and cold water obtained by charging waste water using waste heat from the generator into, for example, an absorption refrigerator flows.

  Control device 290 controls the opening degree of water control valve 280 based on the outside air temperature detected by outside air temperature sensor 260. The technique described in JP 2006-284083 A can be used as appropriate for the method of controlling the opening.

  Here, FIG. 6 shows a piping system diagram during cooling operation of the air source heat pump according to the comparative example. In addition, about the structure similar to this embodiment, the same code | symbol is attached | subjected and description is omitted. The piping system at the time of cooling operation of the air heat source heat pump according to the comparative example is an example of a conventional piping system, and does not include the refrigerant / water heat exchanger 240. Accordingly, the piping 250, the outside air temperature sensor 260, the low pressure sensor 270, the water control valve 280, and the control device 290 are also not provided. Therefore, the temperature of the liquid refrigerant (for example, 10 to 35 ° C.) sent from the outdoor unit 210 to the indoor unit 220 is higher than that of the liquid refrigerant (for example, 10 to 35 ° C.) of the above-described embodiment.

  FIG. 7 shows a ph diagram during cooling operation. In FIG. 7, the horizontal axis represents specific enthalpy, the vertical axis represents absolute pressure, the solid line represents a comparative example, and the dotted line represents an embodiment. As shown in FIG. 7, due to the cooling effect of the refrigerant / water heat exchanger 240, in the embodiment, the enthalpy of the refrigerant liquid (C) sent from the outdoor unit 210 is reduced, and the operation efficiency is improved.

<Effect>
In the air source heat pump 200 according to the embodiment, 50 to 90 ° C. waste hot water is supplied to the refrigerant / water heat exchanger 240 during the heating operation. Therefore, even when the outside air temperature decreases, the pressure loss in the outdoor unit 210 can be suppressed, so that the refrigerant / water heat exchanger 240 is not provided in the refrigerant pipe 230 between the outdoor unit 210 and the indoor unit 220. Operation efficiency can be improved more than (for example, the comparative example mentioned above). In addition, since the exhaust heat water of 50 to 90 ° C. is supplied to the refrigerant / water heat exchanger 240, the exhaust heat from the generator and the like can be effectively used, and the conventional heat assuming heat storage using night electricity is assumed. Driving efficiency can be improved over technology.

  Here, FIG. 8 shows an operation control example of the heating operation. FIG. 8 shows that when the outside air temperature is 7 ° C., the hot water heating is performed so that the heating water heating amount is different between Example 1 and Example 2 so that the pressure of the refrigerant at the inlet (point E) of the expansion valve 211 is 992 to 1192 kPa. This is an example in which the amount is controlled. It is assumed that the operation efficiency is improved by increasing the amount of hot water heating (increasing the opening of the water control valve 280 and increasing the flow rate of hot water). In another test, for example, when 2/3 of the required heat collection amount of the air heat source heat pump 200 is collected from hot water instead of outside air, the evaporation temperature increases by 7 to 10 ° C. and the operation efficiency is 14 to 30%. It is expected to improve.

  As mentioned above, although preferred embodiment of this invention was described, the air heat source heat pump 200 which concerns on this invention can contain these combinations as much as possible not only in these. For example, a hot water coil may be provided in the vicinity of the evaporator 213 of the outdoor unit 210, and warm air may be generated by flowing waste water from a generator or the like through the hot water coil to suppress generation of frost in the evaporator 213.

DESCRIPTION OF SYMBOLS 100 ... Conventional air source heat pump 101 ... Compressor 102 ... 3-way valve 103 ... 4-way valve 104 ... Hot water supply heat exchanger 105 ... Air heat exchanger 106 ... Cold temperature Water heat exchanger 107 ... Flow rate adjustment valve 200 ... Air heat source heat pump 201 ... Air heat source heat pump (comparative example)
210: outdoor unit 211 ... expansion valve 212 ... fan 213 ... evaporator (condenser)
214 ... Compressor 220 ... Indoor unit 221 ... Condenser (evaporator)
222 ... Fan 223 ... Expansion valve 230 ... Refrigerant tube 240 ... Refrigerant / water heat exchanger 250 ... Pipe 260 ... Outside temperature sensor 270 ... Low pressure sensor 280 ... Water Control valve 290 ... control device

Claims (4)

An outside temperature detector for detecting outside temperature;
A pressure detector for detecting the pressure of the refrigerant at the inlet of the outdoor unit;
A pipe through which exhausted hot water supplied to a refrigerant / water heat exchanger provided in a refrigerant pipe between the outdoor unit and the indoor unit and exchanges heat with the refrigerant flowing through the refrigerant pipe;
A control valve that is provided in the pipe and adjusts the flow rate of the exhaust hot water supplied to the refrigerant / water heat exchanger;
The control valve is controlled so that the pressure of the refrigerant detected by the pressure detection unit at the inlet of the outdoor unit is higher than the saturation pressure of the outside air calculated from the outside air temperature detected by the outside air temperature detection unit. An air heat source heat pump. The outdoor unit including an outside air heat exchanger for exchanging heat with outside air;
The indoor unit including an indoor heat exchanger for exchanging heat with indoor air;
A refrigerant pipe connected to the outdoor unit and the indoor unit, through which a refrigerant flows;
The refrigerant / water heat exchanger provided in a refrigerant pipe between the outdoor unit and the indoor unit and exchanging heat with the refrigerant flowing through the refrigerant pipe;
2. The air heat source heat pump according to claim 1, wherein the refrigerant / water heat exchanger is supplied with exhaust hot water of 50 to 90 ° C. during heating operation.   2. The air heat source heat pump according to claim 1, wherein during the cooling operation, the refrigerant / water heat exchanger is supplied with cold water of 5 to 30 ° C. obtained by supplying waste hot water to the refrigerator.   Detecting the outside air temperature, detecting the pressure of the refrigerant at the inlet of the outdoor unit, and adjusting the pressure of the refrigerant at the inlet of the outdoor unit to be higher than the saturation pressure of the outside air calculated from the outside air temperature. An air conditioning method for adjusting a flow rate of exhaust hot water supplied to a refrigerant / water heat exchanger that is provided in a refrigerant pipe between the indoor unit and exchanges heat with a refrigerant flowing through the refrigerant pipe.

Images