JPWO2012114462A1 - Air conditioning and hot water supply system and control method for air conditioning and hot water supply system - Google Patents

Abstract

An air-conditioning hot-water supply system for a multi-heat source in which a dual refrigeration cycle is formed, and an air-conditioning hot-water supply system that can suitably recover refrigerant from an unused heat exchanger and use it in a used heat exchanger, and a control method for the air-conditioning hot-water supply system In order to provide the first operation in the first state in which the intermediate heat exchanger (23) is not used and the heat source side heat exchanger (24) for air conditioning and the heat source side heat exchanger (44) for hot water supply are used, air conditioning When switching the second operation in the second state in which the heat source side heat exchanger (24) and the hot water supply heat source side heat exchanger (44) are not used and the intermediate heat exchanger (23) is used, the intermediate heat exchanger (23) and an air conditioning refrigerant recovery operation for shutting off the inflow of the air conditioning refrigerant to the air conditioning heat source side heat exchanger (24) and recovering the air conditioning refrigerant by the air conditioning compressor (21), and an intermediate heat exchanger (23) and the hot water supply refrigerant to the hot water supply heat source side heat exchanger (44). A refrigerant recovery operation for hot water supply to recover the hot water supply refrigerant in the hot water supply compressor (41) by blocking the entrance to the air-conditioning hot-water supply system in which at least one is performed the.

Description

  The present invention relates to a multi-heat source air-conditioning hot water supply system in which an air conditioning refrigerant circuit and a hot water supply refrigerant circuit are connected to each other via an intermediate heat exchanger so as to be able to exchange heat with each other to form a dual refrigeration cycle of an air conditioning cycle and a hot water supply cycle. The present invention relates to a control method for an air conditioning and hot water supply system.

The refrigerant circuit for air conditioning and the refrigerant circuit for hot water supply are connected to each other via an intermediate heat exchanger so as to be able to exchange heat with each other, and the multi-heat source air conditioning hot water supply system including the air conditioning cycle and the hot water supply cycle exchanges heat with many heat sources. It is configured with more heat exchangers than conventional room air conditioners and heat pump water heaters.
In such an air conditioning hot water supply system, an air conditioning operation (cooling operation, heating operation) of an air conditioning cycle and a hot water supply operation of a hot water supply cycle are independently operated, and an exhaust generated in an air conditioning operation (cooling operation) of the air conditioning cycle. Some heat exchangers (used heat exchangers) that are used in the exhaust heat recovery operation that uses heat for the hot water supply operation of the hot water supply cycle can be switched.
However, since such an air-conditioning hot-water supply system includes many heat exchangers, the amount of necessary refrigerant (the amount of refrigerant enclosed) may increase.
Since the refrigerant is one of the substances that promote global warming, it is not preferable to increase the amount of refrigerant enclosed, and a reduction in the amount of refrigerant enclosed is required.

For example, Patent Literature 1 discloses a multi-air conditioner system that can recover a refrigerant from a stopped indoor unit (heat exchanger).
The multi air conditioner system disclosed in Patent Document 1 is configured to include a plurality of indoor units (heat exchangers). Then, the valve opening degree of the refrigerant flow rate adjustment valve corresponding to the stopped indoor unit is set to a valve opening degree corresponding to the set horsepower of the indoor unit over a predetermined time, and after the predetermined time has elapsed, the flow rate adjustment valve Return the valve opening to. With this configuration, the refrigerant stored in the stopped indoor unit can be recovered. And the refrigerant | coolant enclosure amount can be reduced by utilizing the refrigerant | coolant collect | recovered from the indoor unit which has stopped as a refrigerant | coolant of the indoor unit which is drive | operating.
Therefore, when the technique disclosed in Patent Document 1 is applied to an air-conditioning hot-water supply system with multiple heat sources, a heat exchanger (used heat exchanger) that recovers and uses a refrigerant from an unused heat exchanger (unused heat exchanger). It is possible to reduce the amount of refrigerant enclosed.

JP-A-2-13760

By the way, an air-conditioning hot-water supply system of a multi-heat source provided with an air-conditioning cycle and a hot water supply cycle switches between an independent operation and an exhaust heat recovery operation according to the state of the heat source to be used, and an unused heat exchanger and a used heat exchanger are switched accordingly. Therefore, the unused heat exchanger and the used heat exchanger may be frequently switched. For example, when the heat source is exhaust heat of the air conditioner, the single operation and the exhaust heat recovery operation are switched according to a change in the air conditioning capacity required of the air conditioner. Moreover, when using solar heat as a heat source, the independent operation and the exhaust heat recovery operation are switched according to the change in the amount of solar radiation. As described above, when the single operation and the exhaust heat recovery operation are frequently switched, the operation of recovering the refrigerant from the unused heat exchanger (refrigerant recovery operation) is required to be promptly terminated. Further, since the refrigerant recovery operation is frequently executed, it is required to reduce the load that the refrigerant recovery operation gives to the air conditioning hot water supply system.
However, the multi air conditioner system disclosed in Patent Document 1 increases the valve opening degree of the flow rate adjustment valve over a predetermined time without determining that the refrigerant has been recovered. For this reason, there is a problem that it is impossible to quickly determine that the refrigerant has been recovered from the unused heat exchanger, and the refrigerant recovery operation cannot be completed quickly.

A plurality of heat exchangers are arranged in parallel in each cycle (air conditioning cycle, hot water supply cycle) of the air conditioning and hot water supply system of a multi-heat source. Since each heat exchanger is configured to exchange heat with a different heat source, the refrigerant exchanges heat with a heat source having a different temperature in each heat exchanger. For example, when the temperature of the heat source that is in contact with the unused heat exchanger that operates as an evaporator during use is lower than the temperature of the heat source of the other used heat exchanger (evaporator) that is operating, the unused heat When the refrigerant is stored in the exchanger, the temperature difference between the refrigerant and the heat source is smaller in the unused heat exchanger than in the used heat exchanger, and the evaporation (vaporization) of the refrigerant stored in the unused heat exchanger is reduced. It will not be promoted. As a result, more refrigerant is stored in the unused heat exchanger, and the refrigerant flow rate in the cycle is insufficient, causing a malfunction in the cycle operation.
In the multi-air conditioner system disclosed in Patent Document 1, the heat sources of the plurality of heat exchangers are all the same (atmosphere), and the pressure generated by the difference in the amount of heat absorbed between the heat exchangers is small. For this reason, it is comprised so that the refrigerant | coolant of an unused heat exchanger may be collect | recovered during operation | use of a use heat exchanger, and it is control which does not consider the temperature difference between the heat sources which each heat exchanger contacts.
In view of this point, it is difficult to apply the technique disclosed in Patent Document 1 as it is to refrigerant recovery of an air-conditioning hot-water supply system with multiple heat sources.

  Accordingly, the present invention is an air-conditioning hot-water supply system for a multi-heat source in which a dual refrigeration cycle is formed, and an air-conditioning hot-water supply system and an air-conditioning hot-water supply that can suitably recover the refrigerant of an unused heat exchanger and use it in the used heat exchanger It is an object to provide a system control method.

  In order to solve the above problems, the present invention provides an air conditioning refrigerant circuit in which an air conditioning refrigerant circulates to form an air conditioning cycle, a hot water supply refrigerant circuit in which a hot water supply refrigerant circulates to form a hot water supply cycle, and a control device. And in parallel with the air-conditioning heat source side heat exchanger for exchanging heat between the air-conditioning refrigerant and the atmosphere in the air-conditioning refrigerant circuit, and between the hot-water supply refrigerant and the atmosphere in the hot-water supply refrigerant circuit An intermediate heat exchanger connected in parallel with the hot water supply heat source side heat exchanger for exchanging heat at the air conditioner and exchanging heat between the air conditioning refrigerant and the hot water supply refrigerant, and the control device includes the air conditioning cycle When performing the cooling operation at the same time and the hot water supply operation in the hot water supply cycle, the intermediate heat exchanger is not used and the heat source side heat exchanger for air conditioning and the heat source side heat exchanger for hot water supply are used. With the first driving A second operation in which the intermediate heat exchanger is used to select and use the heat source side heat exchanger for air conditioning and the heat source side heat exchanger for hot water supply according to the operating state, Let it be an air-conditioning hot-water supply system controlled to switch based on conditions. The control device causes the air-conditioning refrigerant to flow into the intermediate heat exchanger and the air-conditioning heat source side heat exchanger by the air-conditioning refrigerant shut-off means when switching between the first operation and the second operation. Air conditioning refrigerant recovery operation for shutting off and operating the air conditioning compressor provided in the air conditioning refrigerant circuit to recover the air conditioning refrigerant from the intermediate heat exchanger and the heat source side heat exchanger, and for hot water supply The refrigerant shut-off means shuts off the flow of the hot water supply refrigerant into the intermediate heat exchanger and the hot water supply heat source side heat exchanger, and operates the hot water compressor provided in the hot water supply refrigerant circuit to operate the intermediate heat. At least one of a hot water supply refrigerant recovery operation for recovering the hot water supply refrigerant from the exchanger and the hot water supply heat source side heat exchanger is performed.

  According to the present invention, there is provided an air conditioning and hot water supply system of a multi-heat source formed by a dual refrigeration cycle, wherein the air conditioning refrigerant circuit and the circulating refrigerant amount of the hot water supply refrigerant circuit are maintained in a suitable state and operated. A control method can be provided.

It is a distribution diagram of an air-conditioning hot-water supply system concerning this embodiment. It is a figure which shows the operation mode of an air-conditioning hot-water supply system. It is a figure which shows the air-conditioning hot-water supply system at the time of air_conditioning | cooling / hot-water supply independent operation. It is a figure showing an air-conditioning hot-water supply system at the time of exhaust heat recovery operation. It is a flowchart which shows the procedure of air_conditioning | cooling / hot-water supply independent operation. (A) is a flowchart which shows the procedure of the 1st air-conditioning refrigerant | coolant collection | recovery driving | operation, (b) is a flowchart which shows the procedure of the 1st hot water supply refrigerant | coolant collection | recovery driving | operation. It is a flowchart which shows the procedure of an exhaust heat recovery driving | operation. (A) is a flowchart which shows the procedure of the refrigerant | coolant recovery driving | operation for 2nd air conditioning, (b) is a flowchart which shows the procedure of the refrigerant | coolant recovery driving | operation for 2nd hot water supply.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, an air conditioning and hot water supply system 100 according to the present embodiment includes an air conditioning refrigerant circuit 5 that drives an air conditioning compressor 21 to switch between a cooling operation and a heating operation, and a hot water supply compressor. The hot water supply refrigerant circuit 6 that drives the hot water supply 41 by driving 41, the air conditioning refrigerant circuit 5 that exchanges heat with the air conditioning cold / hot water circulation circuit 8 that performs the air conditioning of the interior of the house 60, the hot water supply refrigerant circuit 6 and the heat A hot water supply passage 9 for supplying hot water by exchanging and a control device 1a for controlling each operation are provided, and the refrigerant circuit 5 for air conditioning and the refrigerant circuit 6 for hot water supply are thermally connected via an intermediate heat exchanger 23. This is a system for constructing a dual refrigeration cycle.
Hereinafter, the cooling operation and the heating operation indicate a cooling operation and a heating operation of an air conditioning cycle including the air conditioning refrigerant circuit 5. The hot water supply operation refers to a hot water supply operation of a hot water supply cycle including the hot water supply refrigerant circuit 6.

This air conditioning and hot water supply system 100 includes a heat pump unit 1 disposed outside a house 60 and an indoor unit 2 disposed indoors.
The heat pump unit 1 includes an air conditioning refrigerant circuit 5, a hot water supply refrigerant circuit 6, an air conditioning cold / hot water circulation circuit 8, a hot water supply passage 9, and a control device 1a.
The indoor unit 2 includes an indoor heat exchanger 61 that exchanges heat between the indoor air of the house 60 and the cold / hot water flowing through the cold / hot water circulation circuit 8 for air conditioning.

  The air-conditioning refrigerant circuit 5 is a circuit in which a refrigeration cycle (air-conditioning cycle) is formed by circulating air-conditioning refrigerant (hereinafter referred to as air-conditioning refrigerant). The air-conditioning compressor 21 compresses the air-conditioning refrigerant. A four-way valve (air conditioning flow path switching valve) 22 for switching the refrigerant flow path, and an intermediate heat exchanger 23 for exchanging heat between the refrigerant circulating in the hot water supply refrigerant circuit 6 (hereinafter referred to as hot water supply refrigerant) and the air conditioning refrigerant. Heat between the air conditioning refrigerant tank 26, the air conditioning expansion valve 27 for decompressing the air conditioning refrigerant, and the air conditioning cold / hot water circulating in the air conditioning cold / hot water circulation circuit 8 and the air conditioning refrigerant circulating in the air conditioning refrigerant circuit 5. The air conditioning refrigerant main circuit 5a, in which the air conditioning use-side heat exchanger 28 for exchanging is connected in a ring shape with a refrigerant pipe, exchanges heat between the air blown by the air conditioning outdoor fan 25 and the air conditioning refrigerant. The heat source side heat exchanger 24 for air conditioning And it has a connection configuration.

  In FIG. 1, the air-conditioning refrigerant circulating in the air-conditioning refrigerant circuit 5 and the air-conditioning cold / hot water circulating in the air-conditioning cold / hot water circulation circuit 8 exchange heat, and the air-conditioning cold / warm water and indoor air in the house 60 exchange indoor heat. However, the air-conditioning refrigerant and the indoor air of the house 60 may directly exchange heat without using the air-conditioning cold / hot water circulation circuit 8.

The air-conditioning refrigerant circuit 5 will be described in more detail. The air-conditioning heat source side heat exchanger 24 is provided between the four-way valve 22 and the air-conditioning expansion valve 27 of the air-conditioning refrigerant main circuit 5a. The intermediate heat exchanger 23 is connected in parallel to the air conditioning expansion valve 27.
A first control valve 35c and a second control valve 35d for controlling the flow rate of the air-conditioning refrigerant are provided as control valves for the air-conditioning heat exchanger, respectively, at the entrance / exit of the air-conditioning heat source side heat exchanger 24.
The first control valve 35c and the second control valve 35d are configured to block the flow of the air conditioning refrigerant when closed, and block the flow of the air conditioning refrigerant into the heat source side heat exchanger 24 for air conditioning. It is preferable that
Reference numeral 24a denotes a cooling air-conditioning refrigerant inlet (first air-conditioning refrigerant inlet) that serves as an inlet for the air-conditioning refrigerant to the air-conditioning heat source side heat exchanger 24 during the cooling operation, and reference numeral 24b denotes an air-conditioning heat source side during the cooling operation. An air conditioning refrigerant outlet (first air conditioning refrigerant outlet) serving as an outlet for air conditioning refrigerant from the heat exchanger 24 is shown.
Incidentally, at the time of heating operation in the air conditioning cycle, the air conditioning refrigerant outlet / inlet in the air conditioning heat source side heat exchanger 24 is reversed.
Specifically, during the heating operation in the air conditioning cycle, in the air conditioning heat source side heat exchanger 24, the air conditioning refrigerant outlet 24b serves as an air conditioning refrigerant inlet, and the air conditioning refrigerant inlet 24a serves as an air conditioning refrigerant outlet. It becomes.
Note that the air conditioning refrigerant circulating in the air conditioning refrigerant circuit 5, R410a, R134a, HFO1234yf, HFO1234ze, CO 2, the refrigerant suitable for use condition from the propane used.

Next, each device provided in the above-described air conditioning refrigerant circuit 5 will be described.
The air conditioning compressor 21 is preferably a variable capacity compressor capable of capacity control. As such a compressor, a piston type, a rotary type, a scroll type, a screw type, or a centrifugal type can be adopted.

Although not shown in the drawing, the air-conditioning use-side heat exchanger 28 is an air-conditioning heat transfer pipe through which air-conditioning refrigerant flows and an air-conditioning cold / hot water heat-transfer pipe through which an antifreeze liquid such as water or brine (a heat transfer medium on the air-conditioning use side) flows. And a plate type heat exchanger can be used.
The air conditioning refrigerant tank 26 functions as a liquid receiver that adjusts the circulation amount of the air conditioning refrigerant that is changed by switching the flow path of the air conditioning refrigerant circuit 5.
The air conditioning expansion valve 27 functions as a decompression device and also functions as an air conditioning refrigerant shut-off means that shuts off the flow of the air conditioning refrigerant when the valve is closed. The intermediate heat exchanger 23 and the air conditioning heat source side heat exchanger It is preferable that the air-conditioning refrigerant flow into the air-conditioning refrigerant 24 (specifically, the air-conditioning refrigerant inflow from the cooling air-conditioning refrigerant outlets 23b and 24b described later) is blocked.

  The air-conditioning cold / hot water circulation circuit 8 is a circuit through which water (heat transfer medium on the air-conditioning use side) that exchanges heat with the refrigerant circulating in the air-conditioning refrigerant circuit 5 flows, and the four-way valve 53, the air-conditioning cold / hot water circulation pump 52, The indoor heat exchanger 61 installed in the house 60 is connected by an air conditioning cold / hot water pipe 55a having an opening / closing valve 54a, and the indoor heat exchanger 61 and the four-way valve 53 are connected by an air conditioning cold / hot water having an opening / closing valve 54b. It is a circuit formed in an annular shape by connecting with a pipe 55b and connecting the four-way valve 53 and the air-conditioning use side heat exchanger 28 with an air-conditioning cold / hot water pipe 55c. The water (cold water or hot water) flowing through the cold / hot water circulation circuit 8 for air conditioning exchanges heat with the indoor air of the house 60 via the indoor heat exchanger 61 to cool or heat the house 60. Here, a brine such as ethylene glycol may be used in place of water as the heat transfer medium on the air conditioning use side that flows in the cold / hot water circulation circuit 8 for air conditioning. When brine is used, it can be applied even in cold regions.

  In the following description, the term “cold water” or “warm water” is used as the water flowing through the air-conditioning cold / hot water circulation circuit 8, and “cold water” refers to water flowing through the air-conditioning cold / hot water circulation circuit 8 during cooling operation. “Warm water” indicates water flowing through the cold / hot water circulation circuit 8 for air conditioning during heating operation.

  The hot water supply refrigerant circuit 6 forms a refrigeration cycle (hot water supply cycle) by circulating hot water supply refrigerant. The hot water supply compressor 41 compresses the hot water supply refrigerant and the water flowing through the hot water supply passage 9 ( Hot water use side heat exchanger 42 that exchanges heat between the hot water supply and the hot water supply refrigerant, a hot water supply refrigerant tank 46 that functions as a liquid receiver that adjusts the amount of the hot water supply refrigerant, and a hot water supply that depressurizes the hot water supply refrigerant A hot water supply refrigerant main circuit 6a in which an intermediate heat exchanger 23 that performs heat exchange between the expansion valve 43 and the air conditioning refrigerant circulating in the air conditioning refrigerant circuit 5 and the hot water supply refrigerant is connected in a ring shape with a refrigerant pipe, A hot water supply heat source side heat exchanger 44 that performs heat exchange between the air blown by the hot water supply outdoor fan 45 and the hot water supply refrigerant is connected.

The hot-water supply refrigerant circuit 6 will be described in more detail. The third control valve 49a and the fourth control valve 49c for controlling the flow rate of the hot water supply refrigerant are respectively connected to the hot water supply heat source side heat exchanger 44 by a refrigerant pipe so as to be in parallel with the hot water supply heat exchanger 44. It is arranged as a dexterous control valve.
The third control valve 49a and the fourth control valve 49c are configured to block the flow of the hot water supply refrigerant when the valve is closed, and block the inflow of the hot water supply refrigerant to the hot water supply heat source side heat exchanger 44. It is preferable that
Further, the hot water supply expansion valve 43 functions as a hot water supply refrigerant shut-off means that shuts off the flow of the hot water supply refrigerant when the valve is closed, and serves as a hot water supply refrigerant to the intermediate heat exchanger 23 and the hot water supply heat source side heat exchanger 44. It is preferable to be configured to block the inflow of water (specifically, the inflow of hot water supply refrigerant from the hot water supply refrigerant inlets 23c and 44a described later).
In the present embodiment, a finned tube heat exchanger is used for the hot water supply heat source side heat exchanger 44. Reference numeral 44a denotes a hot water supply refrigerant inlet (first hot water supply refrigerant inlet), and reference numeral 44b denotes a hot water supply refrigerant outlet (first hot water supply refrigerant outlet).
Note that the hot water supply refrigerant circulating in the hot water supply refrigerant circuit 6, R410a, R134a, HFO1234yf, HFO1234ze, CO 2, the refrigerant suitable for use condition from the propane used.

Next, each device provided in the hot water supply refrigerant circuit 6 will be described.
The hot water supply compressor 41 is capable of capacity control by inverter control similarly to the air conditioning compressor 21 and preferably has a variable rotational speed from a low speed to a high speed.
Although not shown, the hot water use side heat exchanger 42 is in thermal contact with a hot water supply water heat transfer pipe through which water supplied to the hot water supply passage 9 flows and a hot water supply refrigerant heat transfer pipe through which hot water supply refrigerant flows. Those configured in this way are available.
The hot water supply expansion valve 43 can reduce the pressure of the hot water supply refrigerant to a predetermined pressure by adjusting the valve opening.

On / off ports of the intermediate heat exchanger 23 are provided with on / off valves 35a and 35b as air conditioning heat exchanger on / off valves, respectively.
Reference numeral 23a of the intermediate heat exchanger 23 is an air conditioning refrigerant inlet (second air conditioning refrigerant inlet) that serves as an air conditioning refrigerant inlet during the cooling operation, and reference numeral 23b is an air conditioning refrigerant outlet during the cooling operation. The air-conditioning refrigerant outlet (second air-conditioning refrigerant outlet) is shown.
In the intermediate heat exchanger 23, an on-off valve 49b is disposed at a hot water supply refrigerant inlet (second hot water supply refrigerant inlet) 23c that serves as an inlet for hot water supply refrigerant during hot water supply operation, and serves as an outlet for hot water supply refrigerant. An on-off valve 49d is provided at the refrigerant outlet (second hot water supply refrigerant outlet) 23d.
Incidentally, at the time of the heating operation in the air conditioning cycle, the inlet / outlet of the air conditioning refrigerant in the intermediate heat exchanger 23 is reversed.
Specifically, during the heating operation in the air conditioning cycle, in the intermediate heat exchanger 23, the cooling air conditioning refrigerant outlet 23c serves as an air conditioning refrigerant inlet, and the cooling air conditioning refrigerant inlet 23d serves as an air conditioning refrigerant outlet.

The hot water supply passage 9 is a passage through which water as a heat transfer medium on the use side for hot water supply circulates, and connects the water side inlet 42 a and the water supply port 78 of the use side heat exchanger 42 for hot water supply with a hot water supply pipe 72. The flow path is formed by connecting the water-side outlet 42 b of the hot-water supply-use heat exchanger 42 and the hot-water supply port 79 with a hot-water supply pipe 73. The hot water supply pipe 73 is provided with a hot water storage tank 70, and the water supplied from the water supply port 78 is heated by exchanging heat with the hot water supply refrigerant in the hot water supply use side heat exchanger 42, and becomes hot water. Hot water is stored in 70.
The hot water stored in the hot water storage tank 70 is supplied from the hot water supply port 79 to the hot water supply load side (tub, washroom, kitchen, etc.). A drain pipe 71 a and a drain valve 71 b are provided at the bottom of the hot water storage tank 70. The drain valve 71b is normally closed, and is opened based on a command from the control device 1a so that the hot water stored in the hot water storage tank 70 flows through the drain pipe 71a and is discharged to the outside. Composed. The hot water supply passage 9 is provided with a flow rate sensor (not shown) for detecting the flow rate of water or hot water.

Moreover, the air conditioning and hot water supply system 100 according to the present embodiment includes a plurality of temperature sensors TH1 to TH23. Specifically, in order to measure the temperature of the water or hot water flowing through the hot water supply passage 9, the temperature sensor TH2 is provided at the water side inlet 42a of the hot water use side heat exchanger 42, and the temperature sensor TH1 is further provided at the water supply port 78. Each is equipped.
Further, in order to measure the temperature of the cold / hot water flowing through the air-conditioning cold / hot water circulation circuit 8, a temperature sensor TH4 is provided at the water inlet (heating-time water-side inlet 28a) of the air-conditioning use-side heat exchanger 28 during heating operation. A temperature sensor TH3 is provided at the water outlet (water heating side outlet 28b) of the air conditioning use-side heat exchanger 28 during heating operation, and a temperature sensor TH5 is provided at the refrigerant outlet 61b of the indoor heat exchanger 61. Reference numeral 61 a is a refrigerant inlet of the indoor heat exchanger 61.

Further, in order to measure the temperature of the hot water supply refrigerant flowing through the hot water supply refrigerant circuit 6, temperature sensors TH 6 and TH 7 are respectively provided in the suction port 41 a and the discharge port 41 b of the hot water supply compressor 41, and the hot water supply expansion valve 43 A temperature sensor TH8 is provided at the outlet. Furthermore, a temperature sensor TH22 (hot water supply temperature measurement means) is provided at the hot water supply refrigerant inlet 44a of the hot water supply side heat exchanger 44, a temperature sensor TH9 (hot water supply temperature measurement means) is provided at the hot water supply refrigerant outlet 44b, and the intermediate heat exchanger 23. The hot water supply refrigerant inlet 23c is provided with a temperature sensor TH23 (hot water supply temperature measurement means), and the hot water supply refrigerant outlet 23d is provided with a temperature sensor TH10 (hot water supply temperature measurement means).
The temperature sensors TH9, TH10, TH22, and TH23, which are temperature measuring means for hot water supply, are, for example, thermistors disposed so as to be attached to the outer wall surface of the refrigerant pipe, and the temperature of the hot water supply refrigerant in the refrigerant pipe is set as the refrigerant. Measure through piping. The temperature measured by the temperature sensor TH9 is the temperature of the hot water supply refrigerant outlet 44b, the temperature measured by the temperature sensor TH22 is the temperature of the hot water supply refrigerant inlet 44a, the temperature measured by the temperature sensor TH10 is the temperature of the hot water supply refrigerant outlet 23d, The temperature measured by the temperature sensor TH23 is defined as the temperature of the hot water supply refrigerant inlet 23c.

Further, in order to measure the temperature of the air conditioning refrigerant flowing through the air conditioning refrigerant circuit 5, temperature sensors TH 11 and TH 12 are respectively provided in the suction port 21 a and the discharge port 21 b of the air conditioning compressor 21, and the intermediate heat exchanger 23 The air conditioning refrigerant inlet 23a is provided with a temperature sensor TH13 (air conditioning temperature measuring means), and the air conditioning refrigerant outlet 23b is provided with a temperature sensor TH14 (air conditioning temperature measuring means). Further, the temperature sensor TH17 is provided at the outlet of the air conditioning expansion valve 27 during the cooling operation, the temperature sensor TH15 (air conditioning temperature measuring means) is provided at the cooling air conditioning refrigerant inlet 24a of the heat source side heat exchanger 24, and the air conditioning is used during cooling. A temperature sensor TH16 (air-conditioning temperature measuring means) is provided at the refrigerant outlet 24b, and a temperature sensor TH18 is provided at the air-conditioning refrigerant outlet 28d serving as the air-conditioning refrigerant outlet of the air-conditioning use-side heat exchanger 28 during the cooling operation. Yes.
The temperature sensors TH13, TH14, TH15, and TH16, which are air conditioning temperature measuring means, are, for example, thermistors arranged so as to be attached to the outer wall surface of the refrigerant pipe, and the temperature of the air conditioning refrigerant in the refrigerant pipe is set as the refrigerant. Measure through piping. The temperature measured by the temperature sensor TH13 is the temperature of the cooling air conditioning refrigerant inlet 23a, the temperature measured by the temperature sensor TH14 is the temperature of the cooling air conditioning refrigerant outlet 23b, and the temperature measured by the temperature sensor TH15 is the temperature for cooling air conditioning. The temperature of the refrigerant inlet 24a and the temperature measured by the temperature sensor TH16 are set as the temperature of the air conditioning refrigerant outlet 24b.
Reference numeral 28c denotes a cooling air-conditioning refrigerant inlet that serves as an inlet of the air-conditioning refrigerant to the air-conditioning use-side heat exchanger 28 during the cooling operation.

  Further, in the air conditioning and hot water supply system 100 according to the present embodiment, the temperature sensor TH19 as an outside air temperature measuring unit that measures the outside air temperature, the temperature sensor TH20 that measures the indoor temperature of the house 60, and the hot water stored in the hot water storage tank 70 are stored. A temperature sensor TH21 for measuring the temperature of the hot water is also provided.

Further, the air conditioning compressor 21 is provided with a rotation speed detection sensor RA for detecting the rotation speed, and the hot water supply compressor 41 is provided with a rotation speed detection sensor RH for detecting the rotation speed.
The air conditioning expansion valve 27 is provided with a valve opening degree detection sensor PA for detecting the valve opening degree, and the hot water supply expansion valve 43 is provided with a valve opening degree detection sensor PH for detecting the valve opening degree.

  The control device 1a is configured such that command signals from a remote controller (not shown), temperature sensors TH1 to TH23, rotational speed detection sensors RA and RH, and detection signals from valve opening degree detection sensors PA and PH are input. The Based on these input signals, the control device 1a starts and stops the air conditioning compressor 21 and the hot water supply compressor 41, switches between the four-way valves 22 and 53, the air conditioning expansion valve 27, and the hot water supply expansion valve 43. Setting of opening, setting of valve opening of first control valve 35c, second control valve 35d, third control valve 49a, fourth control valve 49c, driving or stopping of air-conditioning cold / hot water circulation pump 52, open / close valve 35a, The control required for opening and closing of 35b, 49b, 49d, 54a, 54b and other operations of the air conditioning and hot water supply system 100 is executed.

  For example, in the air conditioning and hot water supply system 100 according to the present embodiment, the cooling operation of the air conditioning cycle, the “cooling / hot water supply independent operation (first operation)” for performing the hot water supply operation of the hot water supply cycle alone, and the intermediate heat exchanger 23 are used. “Exhaust heat recovery operation for performing cooling operation of the air conditioning cycle and hot water supply operation of the hot water supply cycle while exchanging heat between the air conditioning refrigerant flowing through the air conditioning refrigerant circuit 5 and the hot water supply refrigerant flowing through the hot water supply refrigerant circuit 6. (Second operation) "is possible.

At the time of cooling / hot water supply independent operation (first operation), the air conditioning and hot water supply system 100 is set to the “cooling / hot water supply independent operation mode” shown in FIG. That is, in the hot water supply cycle, the hot water supply compressor 41 is operated, the hot water supply use side heat exchanger 42 is used as a condenser, the hot water supply heat source side heat exchanger 44 is used as an evaporator, and the intermediate heat exchanger 23. Is not used. In the air conditioning cycle, the air conditioning compressor 21 is operated, the air conditioning use side heat exchanger 28 is used as an evaporator, the air conditioning heat source side heat exchanger 24 is used as a condenser, and the intermediate heat exchanger 23 is not used. It is used. The state of the air conditioning and hot water supply system 100 set to the “cooling / hot water supply independent operation mode” is referred to as a first state.
In this way, when the air conditioning and hot water supply system 100 is set to the “cooling / hot water supply single operation mode” and the air conditioning and hot water supply system 100 is in the first state, the heat exchanger in which the intermediate heat exchanger 23 is not used (hereinafter referred to as an unused heat exchanger). And other heat exchangers (hot water supply use side heat exchanger 42, hot water supply heat source side heat exchanger 44, air conditioning use side heat exchanger 28, and air conditioning heat source side heat exchanger 24) are used. It becomes a heat exchanger (hereinafter, used heat exchanger).

On the other hand, during the exhaust heat recovery operation (second operation), the air conditioning hot water supply system 100 is set to the “exhaust heat recovery operation mode” shown in FIG. That is, the hot water supply compressor 41 is operated in the hot water supply cycle, the hot water supply use side heat exchanger 42 is used as a condenser, the hot water supply heat source side heat exchanger 44 is not used, and the intermediate heat exchanger 23 is evaporated. Used as a vessel. In the air conditioning cycle, the air conditioning compressor 21 is operated, the air conditioning use side heat exchanger 28 is used as an evaporator, the air conditioning heat source side heat exchanger 24 is not used, and the intermediate heat exchanger 23 is a condenser. Used as. The state of the air conditioning and hot water supply system 100 set to the “exhaust heat recovery operation mode” is referred to as a second state.
Thus, when the air conditioning hot water supply system 100 is set to the “exhaust heat recovery operation mode” and the air conditioning hot water supply system 100 enters the second state, the air conditioning heat source side heat exchanger 24 and the hot water supply heat source side heat exchanger 44 are disabled. Other heat exchangers (the intermediate heat exchanger 23, the hot water use side heat exchanger 42, and the air conditioning use side heat exchanger 28) are used heat exchangers.
As described above, the first state set to the “cooling / hot water supply single operation mode” is a state for the air conditioning / hot water supply system 100 to perform the cooling / hot water supply single operation (first operation). The second state set to “” is a state for the air conditioning and hot water supply system 100 to perform the exhaust heat recovery operation (second operation).

Referring to FIG. 3 and FIG. 4, the flow of the refrigerant (air conditioning refrigerant, hot water supply refrigerant) and the water (heat transfer medium) flowing through the air conditioning cold / hot water circulation circuit 8 in the cooling / hot water supply independent operation and the exhaust heat recovery operation are referred to. The flow will be described.
3 and 4, the heat exchanger (intermediate heat exchanger 23, air-conditioning use side heat exchanger 28, air-conditioning heat source side heat exchanger 24, hot water supply use side heat exchanger 42, hot water supply heat source side. The thick arrows attached to the heat exchanger 44) indicate the flow of heat, and are attached to each circuit (air conditioning refrigerant circuit 5, hot water supply refrigerant circuit 6, air conditioning cold / hot water circulation circuit 8, hot water supply flow path 9). The arrows indicate the direction in which refrigerant (air conditioning refrigerant, hot water supply refrigerant) or fluid (water, hot water) flows through each circuit. The white on-off valves (35a, 35b, 49b, 49d) and the white flow control valves (first control valve 35c, second control valve 35d, third control valve 49a, fourth control valve 49c) are opened. The state, the black on-off valve, and the black flow control valve indicate a closed state. In the four-way valve (22, 53), the arc indicated by the solid line indicates the refrigerant and fluid flow paths. Further, the outdoor fans (air conditioning outdoor fan 25 and hot water supply outdoor fan 45) are in operation when white, and are stopped when black. The heat exchangers (intermediate heat exchanger 23, air-conditioning heat source side heat exchanger 24, hot water supply heat source side heat exchanger 44) indicated by broken lines are heat exchangers that are not used, that is, heat that does not circulate refrigerant. A heat exchanger indicated by a solid line indicates a heat exchanger to be used, that is, a heat exchanger in which refrigerant flows (used heat exchanger).

With reference to FIG. 3, the flow of the refrigerant (air conditioning refrigerant, hot water supply refrigerant) and the flow of water (heat transfer medium) flowing through the air conditioning cold / hot water circulation circuit 8 in the cooling / hot water supply single operation will be described.
When the air-conditioning / hot-water supply system 100 is operated in a cooling / hot-water supply single operation, the control device 1a sets the air-conditioning / hot-water supply system 100 to the “cooling / hot-water supply single operation mode” and sets the first state. That is, the control device 1 a flows the high-temperature and high-pressure gas refrigerant discharged from the discharge port 21 b of the air-conditioning compressor 21 into the air-conditioning heat source side heat exchanger 24 and also flows through the air-conditioning use-side heat exchanger 28. The four-way valve 22 is switched so that the air conditioning refrigerant flows into the suction port 21a of the air conditioning compressor 21.
Further, the control device 1a opens the first control valve 35c and the second control valve 35d, operates the air-conditioning outdoor fan 25, opens the third control valve 49a and the fourth control valve 49c, and supplies hot water. The outdoor fan 45 is operated.
Further, the control device 1a closes the on-off valves 35a, 35b, 49b, and 49d.
Thus, the cooling / hot water supply single operation is executed in the first state.
In the “cooling / hot water supply independent operation mode”, the on / off valves 35a and 35b, which are air conditioner heat exchanger on / off valves, are closed to shut off the flow of air conditioning refrigerant into the intermediate heat exchanger 23, thereby exchanging hot water supply heat. By closing the on-off valves 49b and 49d, which are the on-off valves for the appliance, the inflow of the hot water supply refrigerant to the intermediate heat exchanger 23 is blocked, and the intermediate heat exchanger 23 can be made unused.
Further, the first control valve 35c and the second control valve 35d, which are air conditioning heat exchanger control valves, are opened so that the heat source side heat exchanger 24 for air conditioning can be used, which is a hot water supply heat exchanger control valve. When the third control valve 49a and the fourth control valve 49c are opened, the hot water supply heat source side heat exchanger 44 can be used.
When the intermediate heat exchanger 23 is not used, the control device 1a recovers the refrigerant (air conditioning refrigerant, hot water supply refrigerant) from the intermediate heat exchanger 23. Details of the refrigerant recovery will be described later.

  The high-temperature and high-pressure gas refrigerant discharged from the air-conditioning compressor 21 passes through the four-way valve 22 and flows into the air-conditioning heat source side heat exchanger 24. The high-temperature and high-pressure gas refrigerant flowing in the air-conditioning heat source side heat exchanger 24 dissipates heat to the atmosphere sent from the air-conditioning outdoor fan 25 and condenses and liquefies. This high-pressure liquid refrigerant flows through the air-conditioning refrigerant tank 26 and then is decompressed and expanded by the air-conditioning expansion valve 27 adjusted to a predetermined opening degree to become a low-temperature and low-pressure gas-liquid two-phase refrigerant. It flows into the exchanger 28. The gas-liquid two-phase refrigerant flowing in the air-conditioning use-side heat exchanger 28 absorbs heat from the relatively high-temperature cold water flowing in the air-conditioning cold / hot water circulation circuit 8 and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 21a of the air-conditioning compressor 21 through the four-way valve 22, and is compressed again by the air-conditioning compressor 21 to become a high-temperature and high-pressure gas refrigerant.

  In the cold / hot water circulation circuit 8 for air conditioning, the cold water radiated to the air-conditioning refrigerant flowing through the air-conditioning use-side heat exchanger 28 is circulated through the air-conditioning cold / hot water pipe 55 a by the air-conditioning cold / hot water circulation pump 52, to the indoor heat exchanger 61. Inflow. In the indoor heat exchanger 61, heat exchange is performed between the cold water in the cold / hot water circulation circuit 8 for air conditioning and the high-temperature air in the house 60, and the air in the house 60 is cooled. That is, the room in the house 60 is cooled. At this time, the cold water flowing through the indoor heat exchanger 61 is heated by absorbing heat from the air in the house 60. The raised cold water flows through the air conditioning cold / hot water pipes 55b and 55c by the air conditioning cold / hot water circulation pump 52, and again flows through the air conditioning refrigerant circuit 5 while flowing through the air conditioning use-side heat exchanger 28. It is cooled by exchanging heat with the refrigerant.

  On the other hand, in the hot water supply refrigerant circuit 6, the gas refrigerant compressed to a high temperature and high pressure by the hot water supply compressor 41 flows into the hot water use side heat exchanger 42. The high-temperature and high-pressure gas refrigerant that circulates in the hot water use side heat exchanger 42 dissipates heat to the water that circulates in the hot water supply passage 9 and condenses and liquefies. The liquefied high-pressure liquid refrigerant is decompressed and expanded by the hot-water supply expansion valve 43 adjusted to a predetermined opening after flowing through the hot-water supply refrigerant tank 46 to become a low-temperature low-pressure gas-liquid two-phase refrigerant. While flowing through the hot water supply heat source side heat exchanger 44, the gas-liquid two-phase refrigerant absorbs heat from the atmosphere sent by the hot water supply outdoor fan 45 and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 41a of the hot water supply compressor 41 and is compressed again by the hot water supply compressor 41 to become a high-temperature and high-pressure gas refrigerant.

In the hot water supply channel 9, the water flowing into the water inlet 78 flows through the hot water supply pipe 72 and is guided to the hot water use side heat exchanger 42. The water flowing into the hot water supply use side heat exchanger 42 absorbs heat from the hot water supply refrigerant flowing through the hot water supply refrigerant circuit 6 in the hot water supply use side heat exchanger 42 to become high-temperature water (hot water). This hot water is circulated through the hot water supply pipe 73 and stored in the hot water storage tank 70, and hot water is supplied from the hot water supply port 79 according to the user's request.
In the “cooling / hot water supply independent operation mode”, the on-off valves 35a, 35b, 49b, and 49d are closed, and the flow path through which the refrigerant (air conditioning refrigerant, hot water supply refrigerant) flows into the intermediate heat exchanger 23 is closed. Heat exchange is not performed between the air conditioning refrigerant and the hot water supply refrigerant.

Next, with reference to FIG. 4, the flow of the refrigerant (air conditioning refrigerant, hot water supply refrigerant) and the flow of water (heat carrier medium) flowing through the air conditioning cold / hot water circulation circuit 8 in the exhaust heat recovery operation will be described.
When the exhaust heat recovery operation of the air conditioning hot water supply system 100 is performed, the control device 1a sets the air conditioning hot water supply system 100 to the “exhaust heat recovery operation mode” to enter the second state. That is, the control device 1a is configured such that the high-temperature and high-pressure gas refrigerant discharged from the discharge port 21b of the air-conditioning compressor 21 flows into the intermediate heat exchanger 23 and flows through the air-conditioning use-side heat exchanger 28. Switches the four-way valve 22 so as to flow into the suction port 21a of the air conditioning compressor 21.
Further, the control device 1a closes the first control valve 35c and the second control valve 35d, stops the air-conditioning outdoor fan 25, closes the third control valve 49a and the fourth control valve 49c, and supplies hot water. The outdoor fan 45 is stopped.
Further, the control device 1a opens the on-off valves 35a, 35b, 49b, 49d.
Thus, the exhaust heat recovery operation is executed in the second state.
In the “exhaust heat recovery operation mode”, the on / off valves 35a and 35b, which are air conditioner heat exchanger on / off valves, are opened so that the air conditioning refrigerant can flow into the intermediate heat exchanger 23, and the hot water supply heat exchanger on / off valve is opened. When the on-off valves 49b and 49d are opened, the hot water supply refrigerant can flow into the intermediate heat exchanger 23, and the intermediate heat exchanger 23 can be used.
Further, when the first control valve 35c and the second control valve 35d, which are control valves for the air conditioning heat exchanger, are closed, the inflow of the air conditioning refrigerant to the air conditioning heat source side heat exchanger 24 is blocked, and the air conditioning heat source side The heat exchanger 24 can be disabled, and the third control valve 49a and the fourth control valve 49c, which are control valves for the hot water supply heat exchanger, are closed to supply hot water to the heat source side heat exchanger 44 for hot water supply. The inflow of the refrigerant is blocked, and the hot water supply heat source side heat exchanger 44 can be made unusable.
When the air-conditioning heat source side heat exchanger 24 and the hot water supply heat source side heat exchanger 44 are not used, the control device 1a collects the refrigerant (air conditioning refrigerant, hot water supply refrigerant) from each heat exchanger. Details on the collection will be described later.

  The high-temperature and high-pressure gas refrigerant discharged from the air conditioning compressor 21 flows into the intermediate heat exchanger 23, dissipates heat to the low-temperature hot water supply refrigerant, and is condensed and liquefied. This high-pressure liquid refrigerant is decompressed and expanded by an air-conditioning expansion valve 27 that is opened at a predetermined opening after flowing through the air-conditioning tank 26 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant. It flows into the heat exchanger 28. The gas-liquid two-phase refrigerant flowing in the air-conditioning use-side heat exchanger 28 absorbs heat from the relatively high-temperature cold water flowing through the air-conditioning cold / hot water circulation circuit 8 and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 21a of the air-conditioning compressor 21 via the four-way valve 22, and is compressed again by the air-conditioning compressor 21 to become a high-temperature and high-pressure gas refrigerant.

  In the cold / hot water circulation circuit 8 for air conditioning, the cold water radiated to the air-conditioning refrigerant flowing through the air-conditioning use-side heat exchanger 28 is circulated through the air-conditioning cold / hot water pipe 55 a by the air-conditioning cold / hot water circulation pump 52 and flows into the indoor heat exchanger 61. To do. In the indoor heat exchanger 61, heat is exchanged between the cold water in the cold / hot water circulation circuit 8 for air conditioning and the hot air in the room of the house 60, and the air in the house 60 is cooled. That is, the room of the house 60 is cooled. At this time, the cold water flowing through the indoor heat exchanger 61 absorbs heat from the indoor air of the house 60 and rises in temperature. The heated cold water flows through the air conditioning cold / hot water pipes 55b and 55c by the air conditioning cold / hot water pump 52, and is again radiated to the air conditioning refrigerant by the air conditioning use side heat exchanger 28 and cooled.

  In the hot water supply refrigerant circuit 6, the gas refrigerant compressed by the hot water supply compressor 41 and having a high temperature and high pressure flows into the hot water supply use side heat exchanger 42. The high-temperature and high-pressure gas refrigerant flowing in the hot water use side heat exchanger 42 dissipates heat to the water flowing in the hot water supply passage 9 and condenses and liquefies. The liquefied high-pressure liquid refrigerant flows through the hot water supply refrigerant tank 46, and then is decompressed and expanded by the hot water supply expansion valve 43 opened at a predetermined opening degree to become a low-temperature low-pressure gas-liquid two-phase refrigerant. . While flowing through the intermediate heat exchanger 23, the gas-liquid two-phase refrigerant absorbs heat from the high-temperature air-conditioning refrigerant flowing through the intermediate heat exchanger 23 and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 41a of the hot water supply compressor 41 and is compressed again by the hot water supply compressor 41 to become a high-temperature high-pressure gas refrigerant.

  In the hot water supply passage 9, the water flowing into the water supply port 78 flows through the hot water supply pipe 72 and flows into the hot water use side heat exchanger 42. Then, the hot water supply side heat exchanger 42 absorbs heat from the hot water supply refrigerant flowing through the hot water supply refrigerant circuit 6 and becomes high-temperature water (hot water). This hot water is circulated through the hot water supply pipe 73 and stored in the hot water storage tank 70, and hot water is supplied from the hot water supply port 79 according to the user's request.

As described above, the control device 1a according to the present embodiment is configured to be able to appropriately switch between the cooling / hot water supply single operation and the exhaust heat recovery operation.
In the present embodiment, when the controller 1a performs the hot water supply operation in the hot water supply cycle and the cooling operation in the air conditioning cycle at the same time, the amount of heat required for the water flowing through the hot water supply pipe 72 (this heat amount). Corresponds to the amount of heat absorbed by the hot water supply refrigerant circuit 6 and is hereinafter referred to as hot water supply heat absorption amount) and the amount of heat released from the air conditioning refrigerant flowing through the air conditioning refrigerant circuit 5 (this amount of heat is the amount of heat released from the air conditioning refrigerant circuit 5). (Hereinafter referred to as air conditioning heat radiation amount), the exhaust heat recovery operation is executed, and when the hot water supply heat absorption amount and the air conditioning heat radiation amount are not equal, the cooling / hot water single operation is executed.
In other words, the control device 1a according to the present embodiment switches between the exhaust heat recovery operation and the cooling / hot water supply single operation with the hot water heat absorption amount and the air conditioning heat radiation amount as predetermined conditions.

In the cooling / hot water supply single operation, the hot water supply refrigerant in the hot water supply refrigerant circuit 6 flows only through the hot water supply heat source side heat exchanger 44, and in the exhaust heat recovery operation, the hot water supply refrigerant in the hot water supply refrigerant circuit 6 is used. Circulates only the intermediate heat exchanger 23. That is, during the cooling / hot water supply single operation, the hot water supply refrigerant does not flow through the intermediate heat exchanger 23, and during the exhaust heat recovery operation, the hot water supply refrigerant does not flow through the hot water supply heat source side heat exchanger 44. Accordingly, in the hot water supply refrigerant circuit 6, the hot water supply refrigerant corresponding to the flow rate flowing through the intermediate heat exchanger 23 becomes excessive during the cooling / hot water supply independent operation, and during the exhaust heat recovery operation, the hot water supply heat source side heat exchanger is used. The hot water supply refrigerant corresponding to the flow rate flowing through 44 becomes redundant.
Similarly, in the air-conditioning refrigerant circuit 5, the air-conditioning refrigerant corresponding to the flow rate through the intermediate heat exchanger 23 becomes excessive during the cooling / hot water supply single operation, and the air-conditioning heat source side heat exchange during the exhaust heat recovery operation. The air-conditioning refrigerant corresponding to the flow rate flowing through the vessel 24 becomes redundant.

Therefore, when the cooling / hot water supply single operation is switched to the exhaust heat recovery operation, the hot water supply refrigerant circulating through the hot water supply heat source side heat exchanger 44 during the cooling / hot water supply single operation is temporarily recovered, and the recovered hot water supply refrigerant is exhausted. By circulating the heat to the intermediate heat exchanger 23 during operation, the operation can be performed with an appropriate amount of the hot water supply refrigerant in the hot water supply refrigerant circuit 6.
Similarly, when the cooling / hot water supply single operation is switched to the exhaust heat recovery operation, the air conditioning refrigerant circulating through the air-conditioning heat source side heat exchanger 24 during the cooling / hot water supply single operation is temporarily recovered, and the recovered air conditioning refrigerant is discharged. By circulating it through the intermediate heat exchanger 23 during the heat recovery operation, the air conditioning refrigerant circuit 5 can be operated with an appropriate amount of the air conditioning refrigerant enclosed in the air conditioning refrigerant circuit 5.
In this case, when switching from the exhaust heat recovery operation to the cooling / hot water single operation, the hot water supply refrigerant flowing through the intermediate heat exchanger 23 is temporarily recovered during the exhaust heat recovery operation, and the recovered hot water supply refrigerant is used for the cooling / hot water single operation. In some cases, the hot air supply heat source side heat exchanger 44 is circulated, the air conditioning refrigerant flowing through the intermediate heat exchanger 23 is temporarily recovered during the exhaust heat recovery operation, and the recovered air conditioning refrigerant is used as the air conditioning heat source during the cooling / hot water supply single operation. What is necessary is just to set it as the structure distribute | circulated to the side heat exchanger 24. FIG.

With reference to FIGS. 5-8, the procedure when the control apparatus 1a which concerns on this embodiment switches the air_conditioning | cooling hot-water supply system 100 cooling / hot-water supply independent operation and waste heat recovery operation is demonstrated (refer FIGS. 1-4 suitably). .
For example, when a cooling operation is started during a hot water supply operation by a command signal from a remote controller (not shown) operated by a user, the control device 1a performs a cooling / hot water supply single operation as shown in FIG. When the control device 1a starts the cooling / hot water single operation, the inlet / outlet of the intermediate heat exchanger 23 (cooling air conditioning refrigerant inlet 23a, cooling air conditioning refrigerant outlet 23b, hot water supply refrigerant inlet 23c, hot water supply refrigerant outlet 23d). All of the on-off valves 35a, 35b, 49b, 49d disposed in the valve are closed, and the inlet / outlet of the heat source side heat exchanger 24 for air conditioning (cooling air conditioning refrigerant inlet 24a, cooling air conditioning refrigerant outlet 24b) The first control valve 35c and the second control valve 35d, and the third control valve 49a disposed at the inlet / outlet of the hot water supply heat source side heat exchanger 44 (hot water supply refrigerant inlet 44a, hot water supply refrigerant outlet 44b). The fourth control valve 49c is opened. In addition, the air-conditioning refrigerant discharged from the discharge port 21b of the air-conditioning compressor 21 flows into the air-conditioning heat source side heat exchanger 24, and the air-conditioning refrigerant flowing through the air-conditioning use-side heat exchanger 28 is compressed by the air-conditioning. The four-way valve 22 is switched so as to flow into the suction port 21a of the machine 21 (step S1). Then, various data reception processing is performed (step S2). Specifically, the control device 1a receives data indicating the target hot water temperature (boiling temperature), the target hot water amount (flow rate), and the water temperature (water supply temperature) of water supplied from the water supply port 78 in the hot water supply cycle. In addition, data indicating the target temperature (set room temperature), the target air volume, and the room temperature in the air conditioning cycle is received.
Data indicating the target hot water temperature and target hot water volume of the hot water supply cycle is data input to the control device 1a from a remote controller operated by the user, and data indicating the hot water temperature is data input from the temperature sensor TH1.
The data indicating the target temperature and target air volume of the air conditioning cycle is data input to the control device 1a from the remote controller operated by the user, and the data indicating the room temperature is data input from the temperature sensor TH20.

The control device 1a executes arithmetic processing based on each data received in step S2 (step S3). Specifically, the control device 1a sets the target hot water supply capacity “Qh” in the hot water supply cycle, the target rotation speed of the hot water supply compressor 41, the target discharge temperature “Td” of the hot water supply compressor 41, and the input “ Whcomp "is calculated.
Further, the control device 1a sets the target air conditioning capacity “Qc” in the air conditioning cycle, the target rotational speed of the air conditioning compressor 21, the target evaporation temperature “Te” of the air conditioning refrigerant, and the input “Wccomp” of the air conditioning compressor 21. Calculate.
Further, the control device 1a calculates the amount of heat absorbed by the hot water supply from the difference between the target hot water supply capacity “Qh” of the hot water supply cycle and the input “Whcomp” of the hot water supply compressor 41, and the target air conditioning capacity “Qc” of the air conditioning cycle and the air conditioning. The air conditioning heat radiation amount is calculated from the sum of the input “Wccomp” of the compressor 21 (step S4).

And control device 1a operates a hot-water supply cycle and an air-conditioning cycle according to a calculation result in Step S3. Specifically, the control device 1a operates the hot water supply compressor 41 at the target rotational speed calculated in step S3 in the hot water supply cycle, and operates the air conditioning compressor 21 at the target rotational speed calculated in step S3 in the air conditioning cycle. To do. Further, the control device 1a sets the valve opening degree of the hot water supply expansion valve 43 and the rotation speed of the hot water supply outdoor fan 45 so that the discharge temperature of the hot water supply refrigerant in the hot water supply cycle becomes the target discharge temperature “Td”, and air conditioning. The valve opening degree of the air conditioning expansion valve 27 and the rotational speed of the air conditioning outdoor fan 25 are set so that the evaporation temperature of the air conditioning refrigerant in the cycle becomes the target evaporation temperature “Te” (step S5).
For example, a map indicating the relationship between the target discharge temperature, the valve opening degree of the hot water supply expansion valve 43 and the rotational speed of the hot water supply outdoor fan 45 is determined in advance, and the control device 1a is based on the calculated target discharge temperature “Td”. The valve opening degree of the hot water supply expansion valve 43 and the rotational speed of the hot water supply outdoor fan 45 may be set by referring to the map.
Further, a map indicating the relationship between the target evaporation temperature, the valve opening degree of the air conditioning expansion valve 27 and the rotational speed of the air conditioning outdoor fan 25 is determined in advance, and the control device 1a is based on the calculated target evaporation temperature “Te”. By referring to the map, the valve opening degree of the air conditioning expansion valve 27 and the rotational speed of the air conditioning outdoor fan 25 may be set.

Then, the control device 1a compares the hot water supply heat absorption amount calculated in step S4 with the air conditioning heat dissipation amount (step S6), and determines whether the hot water supply heat absorption amount and the air conditioning heat dissipation amount are equal. In step S6, control device 1a determines that the hot water supply heat absorption amount and the air conditioning heat radiation amount are equal when the difference between the hot water heat absorption amount and the air conditioning heat radiation amount is within a preset range.
When the hot water supply heat absorption amount and the air conditioning heat dissipation amount are not equal (step S6 → No), the procedure is returned to step S2, and the cooling / hot water supply single operation is continued.
On the other hand, when the hot water supply heat absorption amount is equal to the air conditioning heat dissipation amount (step S6 → Yes), the control device 1a switches to the exhaust heat recovery operation.
At this time, the control device 1a of the present embodiment is configured to switch the air conditioning hot water supply system 100 to the exhaust heat recovery operation after the procedure proceeds to step S7 and the refrigerant recovery operation (first refrigerant recovery operation) is executed. .
Here, the refrigerant recovery operation (first refrigerant recovery operation) is performed when the air conditioning and hot water supply system 100 is set to the “cooling / hot water supply single operation mode” and the cooling / hot water supply single operation (first operation) is performed in the first state. The air-conditioning refrigerant recovery operation (first air-conditioning refrigerant recovery operation) for temporarily recovering the air-conditioning refrigerant flowing through the air-conditioning heat source side heat exchanger 24 and distributing the recovered air-conditioning refrigerant to the intermediate heat exchanger 23 ) And a hot water supply refrigerant recovery operation for temporarily recovering the hot water supply refrigerant flowing through the hot water supply heat source side heat exchanger 44 during the cooling / hot water supply single operation and distributing the recovered hot water supply refrigerant to the intermediate heat exchanger 23 ( 1st hot water supply refrigerant recovery operation). The procedure of the first refrigerant recovery operation (first air conditioning refrigerant recovery operation, first hot water supply refrigerant recovery operation) will be described with reference to FIG.
During the first refrigerant recovery operation, the first air-conditioning refrigerant recovery operation in the air-conditioning cycle and the first hot-water supply refrigerant recovery operation in the hot-water supply cycle are executed simultaneously, and the first air-conditioning refrigerant recovery operation and the first hot-water supply refrigerant It is assumed that the controller 1a finishes the first refrigerant recovery operation when the recovery operation ends.

FIG. 6A shows the procedure of the first air-conditioning refrigerant recovery operation. That is, a specific procedure in the air conditioning cycle is shown in the procedure in step S7 of FIG. When the first air-conditioning refrigerant recovery operation is started, the control device 1a closes the air-conditioning expansion valve 27 and opens the on-off valve 35a disposed at the air-conditioning refrigerant inlet 23a of the intermediate heat exchanger 23. To do. Furthermore, the control device 1a switches the four-way valve 22 so that the air-conditioning refrigerant flowing through the intermediate heat exchanger 23 or the air-conditioning heat source side heat exchanger 24 flows into the suction port 21a of the air-conditioning compressor 21 (step S701a). ). At this time, the first control valve 35c disposed at the air conditioning refrigerant inlet 24a for cooling and the second control valve 35d disposed at the air conditioning refrigerant outlet 24b of the air conditioning heat source side heat exchanger 24 are opened. Is in a state. Therefore, the air-conditioning heat source side heat exchanger 24 does not enter a state (liquid seal) in which the liquid air-conditioning refrigerant is sealed. Further, by closing the air-conditioning expansion valve 27, the air-conditioning refrigerant flows into the air-conditioning refrigerant outlet 24b of the air-conditioning heat source side heat exchanger 24 and the air-conditioning refrigerant outlet 23b of the intermediate heat exchanger 23. Blocked. Note that step S701a may be configured such that the control device 1a closes the second control valve 35d instead of the air conditioning expansion valve 27. Even with this configuration, the inflow of the air conditioning refrigerant to the cooling air conditioning refrigerant outlet 24b of the air conditioning heat source side heat exchanger 24 and the cooling air conditioning refrigerant outlet 23b of the intermediate heat exchanger 23 can be blocked.
Further, by switching the four-way valve 22 and opening the on-off valve 35a and the first control valve 35c, the air conditioning refrigerant inlet 23a of the intermediate heat exchanger 23 and the air conditioning heat source side heat exchanger 24 are used for air conditioning during cooling. The refrigerant inlet 24a and the suction port 21a of the air conditioning compressor 21 can communicate with each other, and the air conditioning refrigerant remaining in the intermediate heat exchanger 23 and the heat source side heat exchanger 24 is transferred to the air conditioning compressor 21 by the air conditioning compressor 21. Can suck.

The control device 1a continues the operation of the air conditioning compressor 21 (compression of the air conditioning refrigerant), the temperature of the cooling air conditioning refrigerant inlet 24a of the air conditioning heat source side heat exchanger 24, and the cooling air conditioning refrigerant outlet. The temperature of 24b is calculated (step S702a).
Specifically, the control device 1a calculates the temperature of the cooling air conditioning refrigerant inlet 24a based on data received from the temperature sensor TH15 provided in the cooling air conditioning refrigerant inlet 24a of the air conditioning heat source side heat exchanger 24. Based on the data received from the temperature sensor TH16 provided on the air conditioning refrigerant outlet 24b side of the air conditioning heat source side heat exchanger 24, the temperature of the air conditioning refrigerant outlet 24b is calculated.
In the air-conditioning heat source side heat exchanger 24 during the cooling / hot water supply single operation, since the gas refrigerant having a temperature higher than the outside air temperature exists in the air-conditioning refrigerant inlet 24a during the cooling, the temperature of the air-conditioning refrigerant inlet 24a during the cooling is the outside air temperature. Get higher. In addition, since there is a liquid refrigerant that is liquefied by releasing heat to the atmosphere at the air conditioning refrigerant outlet 24b during cooling, the temperature of the air conditioning refrigerant outlet 24b during cooling is close to the outside air temperature. Thus, during cooling / hot water supply single operation, there is a temperature difference between the cooling air conditioning refrigerant inlet 24a and the cooling air conditioning refrigerant outlet 24b.
When the air-conditioning compressor 21 is operated in this state and the air-conditioning refrigerant is recovered from the air-conditioning heat source side heat exchanger 24, the air-conditioning refrigerant inlet 24a at the time of cooling loses high-temperature air-conditioning refrigerant. The temperature of the refrigerant inlet 24a for the time air conditioning is close to the outside air temperature. Similarly, the cooling air-conditioning refrigerant outlet 24b runs out of air-conditioning refrigerant, and the temperature of the cooling air-conditioning refrigerant outlet 24b becomes close to the outside air temperature. Therefore, the temperature difference between the cooling air conditioning refrigerant inlet 24a and the cooling air conditioning refrigerant outlet 24b is eliminated.

Therefore, the control device 1a waits until the temperature difference between the cooling air-conditioning refrigerant inlet 24a and the cooling air-conditioning refrigerant outlet 24b is equal to or lower than a predetermined temperature difference (for example, 5 ° C.) (step S703a → No). When the temperature difference between the air conditioning refrigerant inlet 24a and the cooling air conditioning refrigerant outlet 24b is equal to or less than the predetermined temperature difference (step S703a → Yes), the air conditioning refrigerant is recovered from the air conditioning heat source side heat exchanger 24. And the end of the first air-conditioning refrigerant recovery operation is determined. Then, the control device 1a closes the first control valve 35c and the second control valve 35d.
The predetermined temperature difference here is a temperature difference at which it can be considered that the air-conditioning refrigerant is recovered from the air-conditioning heat source side heat exchanger 24, and is not limited to the above-described 5 ° C., but is the air-conditioning heat source side heat exchanger 24. Any value can be used as long as it is not a temperature difference caused by the phase change of the air-conditioning refrigerant remaining in the tank.
By closing the first control valve 35c and the second control valve 35d, the state where the inflow of the air-conditioning refrigerant to the air-conditioning heat source side heat exchanger 24 is maintained is maintained.
Further, the high-temperature and high-pressure gas refrigerant discharged from the discharge port 21b of the air-conditioning compressor 21 flows into the intermediate heat exchanger 23, and the air-conditioning refrigerant flowing through the air-conditioning use-side heat exchanger 28 is the air-conditioning compressor. The four-way valve 22 is switched so as to flow into the suction port 21a. Then, the air conditioning expansion valve 27 is opened (step S704a).
The air-conditioning refrigerant in the air-conditioning refrigerant circuit 5 is recovered from the air-conditioning heat source side heat exchanger 24 by the procedure from step S701a to step S704a.

FIG. 6B shows the procedure of the first hot water supply refrigerant recovery operation. That is, a specific procedure in the hot water supply cycle is shown in the procedure in step S7 of FIG. When the first hot water supply refrigerant recovery operation is started, the control device 1a closes the hot water supply expansion valve 43 and opens the on-off valve 49d disposed at the hot water supply refrigerant outlet 23d of the intermediate heat exchanger 23 ( Step S701b). At this time, the third control valve 49a provided at the hot water supply refrigerant inlet 44a of the hot water supply heat source side heat exchanger 44 and the fourth control valve 49c provided at the hot water supply refrigerant outlet 44b are in an opened state. . Therefore, the hot water supply heat source side heat exchanger 44 does not enter a state (liquid seal) in which the liquid hot water supply refrigerant is sealed. In addition, by closing the hot water supply expansion valve 43, the flow of hot water supply refrigerant into the hot water supply refrigerant inlet 44a of the hot water supply heat source side heat exchanger 44 and the hot water supply refrigerant inlet 23c of the intermediate heat exchanger 23 is blocked. Step S701b may be configured such that the control device 1a closes the third control valve 49a instead of the hot water supply expansion valve 43. Even with this configuration, it is possible to block the flow of the hot water supply refrigerant into the hot water supply refrigerant inlet 44 a of the hot water supply heat source side heat exchanger 44 and the hot water supply refrigerant inlet 23 c of the intermediate heat exchanger 23.
Further, by opening the on-off valve 49d and the fourth control valve 49c, the hot water supply refrigerant outlet 23d of the intermediate heat exchanger 23, the hot water supply refrigerant outlet 44b of the hot water supply heat source side heat exchanger 44, and the hot water supply compressor 41 The suction port 41 a can be communicated with, and the hot water supply refrigerant remaining in the intermediate heat exchanger 23 and the hot water supply heat source side heat exchanger 44 can be sucked by the hot water supply compressor 41.

Then, the control device 1a continues the operation of the hot water supply compressor 41 (compression of the hot water supply refrigerant), and determines the temperature of the hot water supply refrigerant inlet 44a and the temperature of the hot water supply refrigerant outlet 44b of the hot water supply heat source side heat exchanger 44. Calculation is performed (step S702b).
Specifically, the control device 1a calculates the temperature of the hot water supply refrigerant inlet 44a based on data received from the temperature sensor TH22 provided on the hot water supply refrigerant inlet 44a side of the hot water supply heat source side heat exchanger 44, and supplies the hot water supply Based on the data received from the temperature sensor TH9 provided in the hot water supply refrigerant outlet 44b of the heat source side heat exchanger 44, the temperature of the hot water supply refrigerant outlet 44b is calculated.
In the hot water supply heat source side heat exchanger 44 during the cooling / hot water supply single operation, the hot water supply refrigerant inlet 44a includes a gas-liquid two-phase refrigerant having a temperature lower than the outside air temperature. Lower. Further, since there is a gas refrigerant that has absorbed and vaporized from the atmosphere at the hot water supply refrigerant outlet 44b, the temperature of the hot water supply refrigerant outlet 44b is close to the outside air temperature. Thus, during cooling / hot water supply single operation, a temperature difference occurs between the hot water supply refrigerant inlet 44a and the hot water supply refrigerant outlet 44b.
When the hot water supply compressor 41 is operated in this state and the hot water supply refrigerant is recovered from the hot water supply heat source side heat exchanger 44, the low temperature hot water supply refrigerant disappears in the hot water supply refrigerant inlet 44a. The temperature of 44a is close to the outside air temperature. Similarly, the hot water supply refrigerant outlet 44b runs out of hot water supply refrigerant, and the temperature of the hot water supply refrigerant outlet 44b becomes close to the outside air temperature. Therefore, the temperature difference between the hot water supply refrigerant inlet 44a and the hot water supply refrigerant outlet 44b is eliminated.

Therefore, the control device 1a waits until the temperature difference between the hot water supply refrigerant inlet 44a and the hot water supply refrigerant outlet 44b is equal to or less than a predetermined temperature difference (for example, 5 ° C.) (step S703b → No). When the temperature difference of the hot water supply refrigerant outlet 44b is equal to or smaller than the above-described predetermined temperature difference (step S703b → Yes), it is determined that the hot water supply refrigerant has been recovered from the hot water supply heat source side heat exchanger 44, and the first hot water supply The end of the refrigerant recovery operation is determined. The predetermined temperature difference here is a temperature difference that can be considered that the hot water supply refrigerant has been recovered from the hot water supply heat source side heat exchanger 44, and is not limited to the above-described 5 ° C., but is a hot water supply heat source side heat exchanger 44. Any value can be used as long as it is not a temperature difference caused by the phase change of the hot water supply refrigerant remaining in the tank. For example, the temperature difference is preferably set in advance by a prior experimental measurement or the like. Then, the control device 1a closes the third control valve 49a and the fourth control valve 49c, and further opens the hot water supply expansion valve 43 (step S704b).
By closing the third control valve 49a and the fourth control valve 49c, the state where the flow of the hot water supply refrigerant to the hot water supply heat source side heat exchanger 44 is blocked is maintained.
The hot water supply refrigerant in the hot water supply refrigerant circuit 6 is recovered from the hot water supply heat source side heat exchanger 44 by the procedure from step S701b to step S704b.
Then, when both the first air conditioning refrigerant recovery operation and the first hot water supply refrigerant recovery operation are completed, the control device 1a ends the first refrigerant recovery operation shown in step S7 of FIG. Proceeding to S8, exhaust heat recovery operation is executed.

With reference to FIG. 7, the procedure of the exhaust heat recovery operation according to the present embodiment (the specific procedure of step S8 in FIG. 5) will be described.
The on-off valve 35a disposed at the air conditioning refrigerant inlet 23a and the on-off valve 35b disposed at the air conditioning refrigerant outlet 23b of the intermediate heat exchanger 23 are opened by the first refrigerant recovery operation. doing.
When the exhaust heat recovery operation is started, the control device 1a performs various data reception processing (step S801). Specifically, the control device 1a receives data indicating the target hot water temperature (boiling temperature), the target hot water amount (flow rate), and the water temperature (water supply temperature) of water supplied from the water supply port 78 in the hot water supply cycle. In addition, data indicating the target temperature (set room temperature), the target air volume, and the room temperature in the air conditioning cycle is received. This process is equivalent to step S2 in FIG.
The control device 1a executes arithmetic processing based on each data received in step S801 (step S802). Specifically, the control device 1a sets the target hot water supply capacity “Qh” in the hot water supply cycle, the target rotation speed of the hot water supply compressor 41, the target discharge temperature “Td” of the hot water supply compressor 41, and the input “ Whcomp "is calculated.
Further, the control device 1a sets the target air conditioning capacity “Qc” in the air conditioning cycle, the target rotational speed of the air conditioning compressor 21, the target evaporation temperature “Te” of the air conditioning refrigerant, and the input “Wccomp” of the air conditioning compressor 21. Calculate. This process is equivalent to step S3 in FIG.
And the control apparatus 1a stops the hot water supply outdoor fan 45 (step S803). Further, the air conditioning outdoor fan 25 is stopped (step S804).
That is, in the control device 1a, the intermediate heat exchanger 23 includes an air-conditioning refrigerant that flows through the air-conditioning refrigerant circuit 5 of the air-conditioning cycle that is operated for cooling and a hot-water supply refrigerant that flows through the hot-water supply refrigerant circuit 6 of the hot-water supply cycle that is operated for hot water supply. The air conditioning and hot water supply system 100 is set to the “waste heat recovery operation mode” shown in FIG.

And control device 1a operates a hot-water supply cycle and an air-conditioning cycle according to a calculation result in Step S802. Specifically, the control device 1a operates the hot water supply compressor 41 at the target rotational speed calculated in step S802 in the hot water supply cycle, and the discharge temperature of the hot water supply refrigerant in the hot water supply cycle is calculated in step S802. The valve opening degree of the hot water supply expansion valve 43 is set to be “Td” (step S805).
For example, a map indicating the relationship between the target discharge temperature and the valve opening of the hot water supply expansion valve 43 is determined in advance, and the controller 1a refers to the map based on the calculated target discharge temperature “Td”. What is necessary is just to set it as the structure which sets the valve opening degree of the expansion valve 43. FIG.
Then, the control device 1a operates the air conditioning compressor 21 at the calculated target rotational speed in the air conditioning cycle, and the evaporation temperature of the air conditioning refrigerant in the air conditioning cycle is equal to the target evaporation temperature “Te” calculated in step S802. The valve opening degree of the air conditioning expansion valve 27 is set so as to be (step S806).
For example, a map indicating the relationship between the target evaporation temperature and the valve opening degree of the air conditioning expansion valve 27 is determined in advance, and the control device 1a refers to the calculated map based on the calculated target evaporation temperature “Te”. What is necessary is just to set it as the structure which sets the valve opening degree of the expansion valve 27. FIG.

Furthermore, the control device 1a calculates the hot water supply heat absorption amount and the air conditioning heat dissipation amount in the same procedure as step S4 shown in FIG. 5 (step S807), and determines whether the hot water supply heat absorption amount and the air conditioning heat dissipation amount are equal (step S808). ). In step S808, the control device 1a determines that the hot water supply heat absorption amount and the air conditioning heat radiation amount are equal when the difference between the hot water heat absorption amount and the air conditioning heat radiation amount is within a preset range.
While the hot water supply heat absorption amount is equal to the air conditioning heat dissipation amount (step S808 → Yes), the control device 1a returns the procedure to step S801 and continues the exhaust heat recovery operation. With this configuration, for example, power of the air conditioning outdoor fan 25 and the hot water supply outdoor fan 45 can be reduced, and the air conditioning hot water supply system 100 can be operated with energy saving.
On the other hand, when the hot water supply heat absorption amount and the air conditioning heat dissipation amount are not equal (step S808 → No), the control device 1a switches to the cooling / hot water supply single operation. At this time, the control device 1a advances the procedure to step S809, and collects the air conditioning refrigerant of the intermediate heat exchanger 23 in the air conditioning refrigerant circuit 5 and the hot water supply refrigerant of the intermediate heat exchanger 23 in the hot water supply refrigerant circuit 6. Then, the refrigerant recovery operation (second refrigerant recovery operation) is executed.
The refrigerant recovery operation (second refrigerant recovery operation) here is intermediate when the air-conditioning hot water supply system 100 is set to the “exhaust heat recovery operation mode” and the exhaust heat recovery operation (second operation) is performed in the second state. When the air-conditioning refrigerant circulating through the heat exchanger 23 is temporarily recovered and the recovered air-conditioning refrigerant is distributed to the air-conditioning heat source side heat exchanger 24 and the exhaust heat recovery operation. And a second hot water supply refrigerant recovery operation for temporarily recovering the hot water supply refrigerant flowing through the intermediate heat exchanger 23 and distributing the recovered hot water supply refrigerant to the hot water supply heat source side heat exchanger 44. With reference to FIG. 8, the procedure of the second refrigerant recovery operation (second air conditioning refrigerant recovery operation, second hot water supply refrigerant recovery operation) will be described.
During the second refrigerant recovery operation, the second air-conditioning refrigerant recovery operation in the air-conditioning cycle and the second hot-water supply refrigerant recovery operation in the hot-water supply cycle are executed simultaneously, and the second air-conditioning refrigerant recovery operation and the second hot-water supply refrigerant are performed. When the recovery operation is completed, the control device 1a assumes that the second refrigerant recovery operation is completed.

FIG. 8A shows the procedure of the second air-conditioning refrigerant recovery operation. That is, a specific procedure in the air conditioning cycle is shown in the procedure in step S809 of FIG. When the second air-conditioning refrigerant recovery operation is started, the control device 1a closes the air-conditioning expansion valve 27, and the first control disposed at the air-conditioning refrigerant inlet 24a of the air-conditioning heat source side heat exchanger 24. The valve 35c is opened. Further, the control device 1a switches the four-way valve 22 so that the air-conditioning refrigerant flowing through the intermediate heat exchanger 23 or the air-conditioning heat source side heat exchanger 24 flows into the suction port 21a of the air-conditioning compressor 21 (step S890a). ). At this time, the on-off valves 35a and 35b disposed at the inlet / outlet of the intermediate heat exchanger 23 (the air conditioning refrigerant inlet 23a for cooling and the refrigerant outlet 23b for air conditioning during cooling) are in an opened state. Therefore, the intermediate heat exchanger 23 does not enter a state (liquid seal) in which the liquid air-conditioning refrigerant is sealed. In addition, by closing the air conditioning expansion valve 27, the flow of the air conditioning refrigerant to the cooling air conditioning refrigerant outlet 23b of the intermediate heat exchanger 23 is blocked. Note that step S890a may be configured such that the control device 1a closes the on-off valve 35b disposed in the air conditioning refrigerant outlet 23b of the intermediate heat exchanger 23 in place of the air conditioning expansion valve 27. . Even with this configuration, the inflow of the air conditioning refrigerant to the cooling air conditioning refrigerant outlet 23b of the intermediate heat exchanger 23 can be blocked.
Further, by switching the four-way valve 22 and opening the on-off valve 35a and the first control valve 35c, the air conditioning refrigerant inlet 23a of the intermediate heat exchanger 23 and the air conditioning heat source side heat exchanger 24 are used for air conditioning during cooling. The refrigerant inlet 24a and the suction port 21a of the air conditioning compressor 21 can communicate with each other, and the air conditioning refrigerant remaining in the intermediate heat exchanger 23 and the heat source side heat exchanger 24 is transferred to the air conditioning compressor 21 by the air conditioning compressor 21. Can suck.

The control device 1a continues the operation of the air conditioning compressor 21 (compression of the air conditioning refrigerant), and the temperature of the cooling air conditioning refrigerant inlet 23a of the intermediate heat exchanger 23 and the temperature of the cooling air conditioning refrigerant outlet 23b. Is calculated (step S891a).
Specifically, the control device 1a calculates the temperature of the cooling air conditioning refrigerant inlet 23a based on data received from the temperature sensor TH13 provided on the cooling air conditioning refrigerant inlet 23a side of the intermediate heat exchanger 23, Based on the data received from the temperature sensor TH14 provided in the cooling air conditioning refrigerant outlet 23b of the heat exchanger 23, the temperature of the cooling air conditioning refrigerant outlet 23b is calculated.
In the intermediate heat exchanger 23 during the exhaust heat recovery operation, there is a gas refrigerant having a temperature higher than the outside air temperature at the cooling air conditioning refrigerant inlet 23a, and the cooling air conditioning refrigerant outlet 23b dissipates heat to the hot water supply refrigerant and condenses. Therefore, there is a temperature difference between the cooling air-conditioning refrigerant inlet 23a and the cooling air-conditioning refrigerant outlet 23b.
When the air-conditioning compressor 21 is operated in this state and the air-conditioning refrigerant is recovered from the intermediate heat exchanger 23, the air-conditioning refrigerant inlet 23a disappears from the high-temperature air-conditioning refrigerant. The temperature of the inlet 23a is close to the outside air temperature. Similarly, the air conditioning refrigerant outlet 23b for cooling is free of condensed air conditioning refrigerant, and the temperature of the air conditioning refrigerant outlet 23b for cooling is close to the outside air temperature. Therefore, the temperature difference between the cooling air conditioning refrigerant inlet 23a and the cooling air conditioning refrigerant outlet 23b is eliminated.

Therefore, the control device 1a waits until the temperature difference between the cooling air conditioning refrigerant inlet 23a and the cooling air conditioning refrigerant outlet 23b of the intermediate heat exchanger 23 is equal to or lower than a predetermined temperature difference (for example, 5 ° C.) (step S892a). → No), when the temperature difference between the cooling air-conditioning refrigerant inlet 23a and the cooling air-conditioning refrigerant outlet 23b is equal to or less than the predetermined temperature difference described above (step S892a → Yes), the air-conditioning refrigerant from the intermediate heat exchanger 23 Is determined to be recovered, and the end of the second air-conditioning refrigerant recovery operation is determined. Then, the control device 1a opens the air conditioning expansion valve 27 (step S893a), and ends the second air conditioning refrigerant recovery operation.
The predetermined temperature difference here is a temperature difference that can be considered that the air-conditioning refrigerant has been recovered from the intermediate heat exchanger 23 and is not limited to the above-described 5 ° C., but the air-conditioning refrigerant remaining in the intermediate heat exchanger 23 Any value can be used as long as it is not a temperature difference caused by the phase change.
The air-conditioning refrigerant of the intermediate heat exchanger 23 in the air-conditioning refrigerant circuit 5 is recovered by the procedure from step S890a to step S893a.

FIG. 8B shows the procedure of the second hot water supply refrigerant recovery operation. That is, a specific procedure in the hot water supply cycle is shown in the procedure in step S809 in FIG.
When the second hot water supply refrigerant recovery operation is started, the control device 1a closes the hot water supply expansion valve 43, and further includes a fourth control disposed at the hot water supply refrigerant outlet 44b of the hot water supply heat source side heat exchanger 44. The valve 49c is opened (step S890b). At this time, the on-off valves 49b and 49d disposed at the inlet / outlet of the intermediate heat exchanger 23 (the hot water supply refrigerant inlet 23c and the hot water supply refrigerant outlet 23d) are open. Therefore, the intermediate heat exchanger 23 does not enter a state (liquid seal) in which the liquid hot water supply refrigerant is sealed. Further, the hot water supply expansion valve 43 is closed to block the flow of the hot water supply refrigerant into the hot water supply refrigerant inlet 23c of the intermediate heat exchanger 23. Note that step S890b may be configured such that the control device 1a closes the on-off valve 49b provided at the hot water supply refrigerant inlet 23c of the intermediate heat exchanger 23 instead of the hot water supply expansion valve 43. Even with this configuration, the inflow of hot water supply refrigerant to the hot water supply refrigerant inlet 23c of the intermediate heat exchanger 23 can be blocked.
Further, by opening the on-off valve 49d and the fourth control valve 49c, the hot water supply refrigerant outlet 23d of the intermediate heat exchanger 23, the hot water supply refrigerant outlet 44b of the hot water supply heat source side heat exchanger 44, and the hot water supply compressor 41 The suction port 41 a can be communicated with, and the hot water supply refrigerant remaining in the intermediate heat exchanger 23 and the hot water supply heat source side heat exchanger 44 can be sucked by the hot water supply compressor 41.

Then, the control device 1a continues the operation of the hot water supply compressor 41 (compression of the hot water supply refrigerant), and calculates the temperature of the hot water supply refrigerant inlet 23c and the temperature of the hot water supply refrigerant outlet 23d of the intermediate heat exchanger 23 ( Step S891b).
Specifically, the control device 1a calculates the temperature of the hot water supply refrigerant inlet 23c based on data received from the temperature sensor TH23 provided on the hot water supply refrigerant inlet 23c side of the intermediate heat exchanger 23. Furthermore, the control device 1a calculates the temperature of the hot water supply refrigerant outlet 23d based on data received from the temperature sensor TH10 provided in the hot water supply refrigerant outlet 23d of the intermediate heat exchanger 23.
In the intermediate heat exchanger 23 during the exhaust heat recovery operation, a gas-liquid two-phase refrigerant having a temperature lower than the outside air temperature exists at the hot water supply refrigerant inlet 23c, and heat is absorbed from the air conditioning refrigerant at the hot water supply refrigerant outlet 23d and vaporized. Since a high-temperature gas refrigerant exists, a temperature difference occurs between the hot water supply refrigerant inlet 23c and the hot water supply refrigerant outlet 23d.
When the hot water supply compressor 41 is operated in this state and the hot water supply refrigerant is recovered from the intermediate heat exchanger 23, the hot water supply refrigerant inlet 23c disappears, and the temperature of the hot water supply refrigerant inlet 23c disappears. Becomes a temperature close to the outside air temperature. Similarly, the hot water supply refrigerant outlet 23d runs out of hot water supply refrigerant, and the temperature of the hot water supply refrigerant outlet 23d becomes close to the outside air temperature. Therefore, the temperature difference between the hot water supply refrigerant inlet 23c and the hot water supply refrigerant outlet 23d is eliminated.

Therefore, the control device 1a waits until the temperature difference between the hot water supply refrigerant inlet 23c and the hot water supply refrigerant outlet 23d of the intermediate heat exchanger 23 becomes a predetermined temperature difference (for example, 5 ° C.) or less (step S892b → No). When the temperature difference between the hot water supply refrigerant inlet 23c and the hot water supply refrigerant outlet 23d is equal to or less than the predetermined temperature difference (step S892b → Yes), it is determined that the hot water supply refrigerant has been recovered from the intermediate heat exchanger 23; The end of the hot water supply refrigerant recovery operation is determined. The predetermined temperature difference here is a temperature difference that can be regarded as the recovery of the hot water supply refrigerant from the intermediate heat exchanger 23, and is not limited to the above-described 5 ° C., but the hot water supply refrigerant remaining in the intermediate heat exchanger 23 Any value can be used as long as it is not a temperature difference caused by the phase change. Then, the control device 1a opens the hot water supply expansion valve 43 (step S893b), and ends the second hot water supply refrigerant recovery operation.
The hot water supply refrigerant of the intermediate heat exchanger 23 in the hot water supply refrigerant circuit 6 is recovered by the procedure from step S890b to step S893b.
Then, when both the second air conditioning refrigerant recovery operation and the second hot water supply refrigerant recovery operation are completed, the control device 1a assumes that the second refrigerant recovery operation shown in step S809 of FIG. Returning to step S1 shown, the cooling / hot water supply single operation is executed.

As described above, the air conditioning and hot water supply system 100 (see FIG. 1) according to the present embodiment includes the cooling operation of the air conditioning cycle, the cooling and hot water supply single operation that performs the hot water supply operation of the hot water supply cycle alone, and the intermediate heat exchanger 23. Exhaust heat recovery operation for performing cooling operation of the air conditioning cycle and hot water supply operation of the hot water supply cycle while exchanging heat between the air conditioning refrigerant flowing through the air conditioning refrigerant circuit 5 and the hot water supply refrigerant flowing through the hot water supply refrigerant circuit 6. Can be switched according to the amount of heat absorbed by the hot water supply and the amount of heat released from the air conditioning.
The refrigerant recovery operation (first refrigerant recovery operation, second refrigerant recovery operation) is executed by the air conditioning refrigerant circuit 5 and the hot water supply refrigerant circuit 6 when switching between the cooling / hot water supply single operation and the exhaust heat recovery operation. And

According to this configuration, for example, when the air conditioning and hot water supply system 100 (see FIG. 1) switches from the cooling / hot water supply single operation to the exhaust heat recovery operation, the hot water supply refrigerant circuit 6 (see FIG. 1) always has the hot water supply heat source side. The heat exchanger 44 (see FIG. 1) can be brought into a state where the hot water supply refrigerant is recovered.
The control device 1a (see FIG. 1) includes an inlet / outlet (hot water supply refrigerant inlet 44a, hot water supply refrigerant outlet 44b) of the hot water supply heat source side heat exchanger 44 and an inlet / outlet of the intermediate heat exchanger 23 (hot water supply refrigerant inlet 23c, It is possible to quickly determine that the hot water supply refrigerant has been recovered based on the temperature difference of the hot water supply refrigerant outlet 23d), and the flow rate control valves (third control valve 49a, fourth control valve) provided at the inlet / outlet of the hot water supply heat source side heat exchanger 44. 49c) can be quickly closed. Therefore, the hot water supply compressor 44 (see FIG. 1) can be shortened while the hot water supply refrigerant is recovered from the hot water supply heat source side heat exchanger 44, and the hot water supply compressor 44 can be shortened. It is possible to suitably prevent an excessive load from being applied.
In the air conditioning refrigerant circuit 5 (see FIG. 1), the air conditioning heat source side heat exchanger 24 (see FIG. 1) can always be in a state where the air conditioning refrigerant is recovered. Is collected, the inlet / outlet of the air-conditioning heat source side heat exchanger 24 (cooling air-conditioning inlet 24a, cooling air-conditioning refrigerant outlet 24b) and the intermediate heat exchanger 23 (air-conditioning inlet 23a, cooling) It is possible to quickly determine the temperature difference of the refrigerant outlet for air conditioning 23b), and to appropriately prevent an excessive load from being applied to the air conditioning compressor 21 (see FIG. 1).

For example, when the cooling / hot water supply single operation is switched to the exhaust heat recovery operation, the remaining amount of the hot water supply refrigerant in the hot water supply heat source side heat exchanger 44 varies depending on the state of the refrigerant (liquid, gas, gas-liquid two phases). However, in the case of liquid, a large amount of hot water supply refrigerant remains in the hot water supply heat source side heat exchanger 44.
As a result, the circulation amount of the hot water supply refrigerant in the hot water supply refrigerant circuit 6 during the exhaust heat recovery operation is reduced. That is, according to the state of the hot water supply refrigerant in the hot water supply heat source side heat exchanger 44, the circulation amount of the hot water supply refrigerant in the hot water supply refrigerant circuit 6 during the exhaust heat recovery operation changes. Therefore, the flow rate of the hot water supply refrigerant may be different for each exhaust heat recovery operation, and as a result, the stability of the exhaust heat recovery operation decreases.
The same thing occurs also in the air conditioning refrigerant circuit 5 (see FIG. 1).
It also occurs when the exhaust heat recovery operation is switched to the cooling / hot water single operation, which causes a decrease in the stability of the cooling / hot water single operation.

The air conditioning and hot water supply system 100 according to the present embodiment (see FIG. 1), when switching from the cooling / hot water single operation to the exhaust heat recovery operation as described above, the hot water supply refrigerant recovery operation (the first hot water supply refrigerant recovery operation, the second The hot water supply refrigerant in the hot water supply heat source side heat exchanger 44 can be recovered by the hot water supply refrigerant recovery operation), and the circulation amount of the hot water supply refrigerant in the hot water supply refrigerant circuit 6 during the exhaust heat recovery operation is always constant. Can do. Therefore, the stability of the exhaust heat recovery operation can be improved.
Similarly, the flow rate of the air-conditioning refrigerant in the air-conditioning refrigerant circuit 5 during the exhaust heat recovery operation can always be made constant, and the stability of the exhaust heat recovery operation can be further improved.
In addition, the flow rate of the hot water supply refrigerant in the hot water supply refrigerant circuit 6 and the flow rate of the air conditioning refrigerant in the air conditioning refrigerant circuit 5 during cooling and hot water supply independent operation can always be made constant, so that the cooling and hot water supply independent operation is stable. Can also be improved.

In the air conditioning refrigerant circuit 5 (see FIG. 1), the intermediate heat exchanger 23 is not used during the cooling / hot water supply single operation, and the air conditioning heat source side heat exchanger 24 is not used during the exhaust heat recovery operation. The air-conditioning hot-water supply system 100 (refer FIG. 1) which concerns on this embodiment collect | recovers the air-conditioning refrigerant | coolants of the heat exchanger (unused heat exchanger) which is not used, and utilizes it with the used heat exchanger (use heat exchanger). Since it is a structure, when the refrigerant | coolant for air conditioning is not collect | recovered, the quantity of the refrigerant | coolant for air conditioning which remains in an unused heat exchanger can be reduced. Therefore, the amount of air-conditioning refrigerant enclosed in the air-conditioning refrigerant circuit 5 can be reduced.
Similarly, the amount of hot water supply refrigerant enclosed in the hot water supply refrigerant circuit 6 can be reduced.
Air-conditioning refrigerants and hot water supply refrigerants are one of the substances that promote global warming, and reducing the amount enclosed (use) contributes to the suppression of global warming.
That is, the air conditioning and hot water supply system 100 (see FIG. 1) according to the present embodiment executes the refrigerant recovery operation (first refrigerant recovery operation, second refrigerant recovery operation) when switching between the cooling / hot water supply single operation and the exhaust heat recovery operation. As a result, the amount of refrigerant (air-conditioning refrigerant, hot water supply refrigerant) used is reduced, which contributes to the suppression of global warming.

In addition, since the cooling / hot water supply independent operation and the exhaust heat recovery operation are switched according to changes in the hot water supply heat absorption amount and the air conditioning heat dissipation amount, for example, the temperature of the water supplied from the water inlet 78 (see FIG. 1), the hot water storage tank 70 Depending on changes in the temperature (set temperature) of hot water stored in (see FIG. 1), the set temperature of the house 60, the outside air temperature, etc., the cooling / hot water supply independent operation and the exhaust heat recovery operation may be frequently switched.
Although not shown, in the case of a configuration that includes a solar heat collector and uses solar heat as a heat source, the hot water supply heat absorption amount and the air conditioning heat dissipation amount change according to the change in the amount of solar radiation. Waste heat recovery operation switches more frequently.
For this reason, it is preferable that the cooling / hot water supply single operation and the exhaust heat recovery operation are switched quickly, and for this purpose, it is preferable that the refrigerant recovery operation (the first refrigerant recovery operation and the second refrigerant recovery operation) be executed quickly. .
The air conditioning and hot water supply system 100 (see FIG. 1) according to the present embodiment is configured such that the air conditioning expansion valve 27 (see FIG. 1) and the hot water supply expansion valve 43 (see FIG. 1) are closed, and the first control valve 35c (see FIG. 1). ), The refrigerant recovery operation can be performed only by the opening / closing operation of the fourth control valve 49c (see FIG. 1), the on-off valve 35a (see FIG. 1) and the on-off valve 49d (see FIG. 1). Since setting or the like is unnecessary, the refrigerant recovery operation can be performed quickly. Furthermore, it is only necessary to calculate the temperatures at the entrances and exits of the intermediate heat exchanger 23 (see FIG. 1), the heat source side heat exchanger 24 (see FIG. 1), and the hot water supply heat source side heat exchanger 44 (see FIG. 1). The end of recovery of the refrigerant (air-conditioning refrigerant, hot water supply refrigerant) can be easily determined, and the refrigerant recovery operation can be executed quickly in this respect as well.

In addition, the refrigerant (air conditioning refrigerant, hot water supply refrigerant) can be easily recovered simply by calculating the temperatures at the inlet and outlet of the intermediate heat exchanger 23, the air conditioning heat source side heat exchanger 24, and the hot water supply heat source side heat exchanger 44. Since the end can be determined, the operating time of the air conditioning compressor 21 (see FIG. 1) in a state in which the air conditioning refrigerant is recovered from the inside of the intermediate heat exchanger 23 and the air conditioning heat source side heat exchanger 24, And the operating time of the hot water supply compressor 41 (refer FIG. 1) in the state by which the hot water supply refrigerant | coolant was collect | recovered from the inside of the intermediate heat exchanger 23 and the hot water supply heat source side heat exchanger 44 can be shortened.
The compressor (air conditioning refrigerant, hot water supply refrigerant) is recovered from the inside of the heat exchanger (intermediate heat exchanger 23, air conditioning heat source side heat exchanger 24, hot water supply heat source side heat exchanger 44). When the air conditioning compressor 21 and the hot water supply compressor 41) are operated, an excessive load is applied to the compressor and the heat exchanger. In this embodiment, based on the temperature at the inlet / outlet of the heat exchanger, it is possible to quickly determine that the refrigerant has been recovered from the heat exchanger, and the operation time in a state where an excessive burden is placed on the compressor Can be shortened.
And the temperature sensor previously arrange | positioned is used for the calculation of the temperature of the entrance / exit of a heat exchanger (intermediate heat exchanger 23, the heat source side heat exchanger 24 for air conditioning, and the heat source side heat exchanger 44 for hot water supply). be able to. Therefore, it is not necessary to provide a member (sensor or the like) for the refrigerant recovery operation (first refrigerant recovery operation, second refrigerant recovery operation), and the air-conditioning hot water supply system 100 (see FIG. 1) having a simple configuration is provided. Can do.

As described above, the air conditioning and hot water supply system 100 (see FIG. 1) according to the present embodiment is configured to collect the refrigerant of the unused heat exchanger and distribute the refrigerant circuit as the refrigerant of the used heat exchanger. For example, in the hot water supply refrigerant circuit 6 (see FIG. 1) during the exhaust heat recovery operation, the hot water supply refrigerant of the hot water supply heat source side heat exchanger 44 (see FIG. 1), which becomes an unused heat exchanger, is recovered and used. The hot water supply refrigerant circuit 6 is circulated as the hot water supply refrigerant of the intermediate heat exchanger 23 (see FIG. 1) serving as a heat exchanger.
For example, the flow rate of the hot water supply refrigerant flowing through the intermediate heat exchanger 23 may be configured to be smaller than the flow rate of the hot water supply refrigerant flowing through the hot water supply heat source side heat exchanger 44. In this case, if all of the hot water supply refrigerant recovered from the hot water supply heat source side heat exchanger 44 flows into the hot water supply refrigerant circuit 6, an excessive amount of hot water supply refrigerant flows.
Therefore, in the refrigerant recovery operation (first refrigerant recovery operation) executed when switching from the cooling / hot water supply single operation to the exhaust heat recovery operation, the surplus hot water supply refrigerant is stored in the hot water supply heat source side heat exchanger 44. It is good.
For example, in the first hot water supply refrigerant recovery operation shown in FIG. 6B, the controller 1a (see FIG. 1) determines that the hot water supply refrigerant has been recovered from the hot water supply heat source side heat exchanger 44 in step S703b. (Step S703b → Yes), if a configuration for opening the hot water supply expansion valve 43 (see FIG. 1) and closing the on-off valve 49b (see FIG. 1) over a predetermined time, a predetermined amount of hot water supply is provided. The refrigerant for cooling can flow into the heat source side heat exchanger 44 for hot water supply. Thereafter, the control device 1a closes the third control valve 49a (see FIG. 1) and the fourth control valve 49c (see FIG. 1), so that a predetermined amount of hot water supply refrigerant is supplied to the hot water supply heat source side heat exchanger 44. Can be stored.

The storage amount of the hot water supply refrigerant in the hot water supply heat source side heat exchanger 44 (see FIG. 1) is the amount of the hot water supply refrigerant enclosed in the hot water supply refrigerant circuit 6 (see FIG. 1), the hot water supply heat source side heat exchanger 44 This amount is determined as appropriate according to the flow rate of the hot water supply refrigerant and the flow rate of the hot water supply refrigerant in the intermediate heat exchanger 23 (see FIG. 1). The predetermined time for opening the hot water supply expansion valve 43 and closing the on-off valve 49b is the amount of flow of hot water supply refrigerant into the hot water supply heat source side heat exchanger 44 per unit time and storage of the hot water supply refrigerant. The time is determined appropriately according to the amount.
The inflow amount of the hot water supply refrigerant to the hot water supply heat source side heat exchanger 44 per unit time depends on the rotational speed of the hot water supply compressor 41, the valve opening degrees of the hot water supply expansion valve 43 and the third control valve 49a, and the like. It is determined. Therefore, the predetermined time for closing the on-off valve 49b can be easily determined based on the rotation speed of the hot water supply compressor 41, the valve opening degrees of the hot water supply expansion valve 43, the third control valve 49a, and the like.
The air-conditioning hot water supply system 100 (see FIG. 1) of the present embodiment is configured so that surplus hot water supply refrigerant is transferred to the hot water supply heat source side heat exchanger 44 from the state where all of the hot water supply refrigerant in the hot water supply heat source side heat exchanger 44 has been recovered. Therefore, the storage amount of the hot water supply refrigerant in the hot water supply heat source side heat exchanger 44 can be accurately managed.
That is, since the remaining amount of the hot water supply refrigerant in the hot water supply heat source side heat exchanger 44 is zero, the hot water supply refrigerant can flow into the hot water supply heat source side heat exchanger 44 over a predetermined time. An accurate amount of hot water supply refrigerant can be made to flow into the hot water supply heat source side heat exchanger 44 in accordance with the amount of refrigerant flowing in per unit time and for a predetermined time.
Therefore, for example, a larger amount of hot water supply refrigerant than surplus hot water supply refrigerant does not flow into the hot water supply heat source side heat exchanger 44, and consequently, for hot water supply that circulates through the hot water supply refrigerant circuit 6 during the exhaust heat recovery operation. It can be prevented that the flow rate of the refrigerant is insufficient.
Similarly, in the air conditioning refrigerant circuit 5, the air conditioning refrigerant can be stored in the air conditioning heat source side heat exchanger 24, and the flow rate of the air conditioning refrigerant flowing through the air conditioning refrigerant circuit 5 is insufficient during the exhaust heat recovery operation. Can be prevented.

  The air conditioning and hot water supply system 100 (see FIG. 1) according to the present embodiment is configured as described above, but the design can be changed as appropriate without departing from the spirit of the invention.

For example, the air conditioning and hot water supply system 100 according to the present embodiment (see FIG. 1) includes a hot water supply refrigerant recovery operation (first hot water supply refrigerant recovery operation, second hot water supply refrigerant recovery operation) and an air conditioning refrigerant recovery operation (first air conditioning). However, it may be configured to execute one of the hot water supply refrigerant recovery operation and the air conditioning refrigerant recovery operation.
In addition, the air conditioning and hot water supply system 100 according to the present embodiment is configured so that the cooling and hot water supply is independently operated when the hot water supply heat absorption amount and the air conditioning heat dissipation amount are not equal. In such a case, a configuration may be employed in which a heat quantity greater than the hot water supply heat absorption quantity among the air conditioning heat radiation quantity is radiated by the air conditioning heat source side heat exchanger 24 (see FIG. 1).
Specifically, when the air conditioning heat dissipation amount is larger than the hot water supply heat absorption amount, the control device 1a (see FIG. 1), in the air conditioning cycle, the first control valve 35c (see FIG. 1) and the second control valve 35d (see FIG. 1). Is opened to allow a part of the air-conditioning refrigerant to flow through the air-conditioning heat source side heat exchanger 24, and the air-conditioning outdoor fan 25 (see FIG. 1) is operated. The air-conditioning refrigerant in the air-conditioning cycle flows to the intermediate heat exchanger 23 (see FIG. 1) and the air-conditioning heat source side heat exchanger 24, dissipates heat to the hot water supply refrigerant in the intermediate heat exchanger 23, and the air-conditioning heat source side heat. The exchanger 24 radiates heat to the atmosphere.
Also in this configuration, when switching to exhaust heat recovery operation when the air conditioning heat dissipation amount and hot water supply heat absorption amount are equal, the air conditioning refrigerant recovery operation improves the stability of the exhaust heat recovery operation. it can.

In the air conditioning and hot water supply system 100 according to the present embodiment, the heat exchanger (air conditioning heat source side heat exchanger 24, The speed at which the refrigerant (air conditioning refrigerant, hot water supply refrigerant) is recovered from the hot water supply heat source side heat exchanger 44 and the intermediate heat exchanger 23) can be changed. That is, the higher the rotational speed of the compressor, the faster the refrigerant can be recovered from the heat exchanger. Therefore, the time required for the refrigerant recovery operation (the first refrigerant recovery operation and the second refrigerant recovery operation) can be adjusted by adjusting the rotation speed of the compressor.
Specifically, the time required for the refrigerant recovery operation can be shortened by operating the compressor at a high rotational speed.

  Further, for example, in the hot water supply refrigerant recovery operation (first hot water supply refrigerant recovery operation, second hot water supply refrigerant recovery operation), the control device 1a uses the hot water supply heat source side heat exchanger 44 (see FIG. 1). Although the end of the hot water supply refrigerant recovery operation is determined based on the temperature difference between the inlet 44a and the hot water supply refrigerant outlet 44b, it can be modified as follows (see FIGS. 1 to 4 as appropriate).

<< Modification 1 >>
In the hot water supply heat source side heat exchanger 44 during single operation of cooling and hot water supply, there is a low temperature and low pressure hot water supply refrigerant (gas-liquid two-phase refrigerant) flowing through the hot water supply expansion valve 43 at the hot water supply refrigerant inlet 44a. The temperature is lower than the outside air temperature. When the hot water supply refrigerant is recovered from this state, when the hot water supply refrigerant at the hot water supply refrigerant inlet 44a runs out, the temperature of the hot water supply refrigerant inlet 44a rises to a temperature close to the outside air temperature. In other words, when the temperature of the hot water supply refrigerant inlet 44a rises to a temperature close to the outside air temperature and the temperature difference between the hot water supply refrigerant inlet 44a and the outside air temperature becomes small, the hot water supply from the heat source side heat exchanger for hot water supply 44 is supplied. It can be determined that the refrigerant for use has been recovered.
Therefore, for example, in step S702b of FIG. 6B, the control device 1a determines the outside air temperature based on the received data from the temperature sensor TH19 instead of the temperature of the hot water supply refrigerant outlet 44b of the hot water supply heat source side heat exchanger 44. Is configured to calculate. Furthermore, in step S703b, the control device 1a sets the temperature of the hot water supply refrigerant inlet 44a until the temperature difference between the temperature of the hot water supply refrigerant inlet 44a and the outside air temperature becomes less than a predetermined outside air temperature difference (for example, 15 ° C.). When the temperature rises, it may be determined that the hot water supply refrigerant has been recovered from the hot water supply heat source side heat exchanger 44 and the end of the first hot water supply refrigerant recovery operation is determined.
In addition, instead of the temperature of the hot water supply refrigerant inlet 44a, when the temperature difference between the temperature of the hot water supply refrigerant outlet 44b and the outside air temperature becomes less than the above-described difference between the outside air temperatures, the control device 1a performs heat exchange on the heat source side for hot water supply The configuration may be such that it is determined that the hot water supply refrigerant has been recovered from within the vessel 44.
Further, during the second hot water supply refrigerant recovery operation for recovering the hot water supply refrigerant from the intermediate heat exchanger 23, the control device 1a causes the temperature difference between the temperature of the hot water supply refrigerant inlet 23c and the outside air temperature to be less than the above described outside air temperature difference. It is good also as a structure which determines that the hot water supply refrigerant | coolant was collect | recovered from the inside heat exchanger 23, and the temperature difference of the hot water supply refrigerant | coolant exit 23d and external temperature becomes less than the above-mentioned external air temperature difference. It is good also as a structure which determines that the refrigerant | coolant for hot water supply was collect | recovered from the inside of the intermediate heat exchanger 23.
That is, the control device 1a determines the temperature difference between the hot water supply refrigerant inlet 44a and the outside air temperature of the hot water supply heat source side heat exchanger 44, the temperature difference between the hot water supply refrigerant outlet 44b and the outside air temperature, and the intermediate heat exchanger 23. Based on at least one of the temperature difference between the temperature of the hot water supply refrigerant inlet 23c and the outside air temperature, and the temperature difference between the temperature of the hot water supply refrigerant outlet 23d and the outside air temperature, the hot water supply refrigerant recovery operation (first hot water supply refrigerant recovery operation, The end of the second hot water supply refrigerant recovery operation) can be determined.
Even if it is such a structure, it is not necessary to arrange | position members (sensor etc.) other than a temperature sensor, and it can be set as the air-conditioning hot-water supply system 100 of a simple structure.

Note that the first modification can also be applied to the air conditioning refrigerant recovery operation (first air conditioning refrigerant recovery operation, second air conditioning refrigerant recovery operation).
When applied to the first air-conditioning refrigerant recovery operation, the control device 1a uses the outside air instead of the temperature of the cooling air-conditioning refrigerant outlet 24b of the air-conditioning heat source side heat exchanger 24 in step S702a of FIG. In step S703a, when the temperature difference between the cooling air-conditioning refrigerant inlet 24a and the outside air temperature is less than the predetermined outside air temperature difference, the air-conditioning heat source side heat exchanger 24 It is determined that the air-conditioning refrigerant has been recovered, and the end of the first air-conditioning refrigerant recovery operation is determined.
In addition, instead of the temperature of the cooling air conditioning refrigerant inlet 24a, when the temperature difference between the cooling air conditioning refrigerant outlet 24b and the outside air temperature becomes less than the above-mentioned outside air temperature difference, the control device 1a It is good also as a structure which determines with the refrigerant | coolant for an air conditioning having been collect | recovered from the heat source side heat exchanger 24 inside.
Further, during the second air-conditioning refrigerant recovery operation for recovering the air-conditioning refrigerant from the intermediate heat exchanger 23, the control device 1a causes the temperature difference between the cooling air-conditioning refrigerant inlet 23a and the outside air temperature to be less than the above-described outside air temperature difference. It is good also as a structure which determines that the air-conditioning refrigerant | coolant was collect | recovered from the inside heat exchanger 23 when it becomes, and the temperature difference of the temperature of the air-conditioning refrigerant | coolant exit 23b at the time of air_conditioning | cooling and external temperature is mentioned above outside temperature It may be configured to determine that the air-conditioning refrigerant has been recovered from the intermediate heat exchanger 23 when the difference is less than the difference.
That is, the control device 1a determines the temperature difference between the cooling air-conditioning refrigerant inlet 24a and the outside air temperature of the air-conditioning heat source side heat exchanger 24, the temperature difference between the cooling air-conditioning refrigerant outlet 24b and the outside air temperature, and intermediate heat. Based on at least one of the temperature difference between the cooling air-conditioning refrigerant inlet 23a and the outside air temperature of the exchanger 23 and the temperature difference between the cooling air-conditioning refrigerant outlet 23b and the outside air temperature, the air-conditioning refrigerant recovery operation ( It can be set as the structure which determines completion | finish of the refrigerant | coolant collection | recovery driving | operation for 1st air conditioning, and the refrigerant | coolant collection | recovery operation for 2nd air conditioning.

<< Modification 2 >>
In the first modification, the temperature of the hot water supply refrigerant inlet 44a rises when the hot water supply refrigerant at the hot water supply refrigerant inlet 44a runs out. Based on the rate of temperature increase, the control device 1a performs heat supply side heat source heat supply. It may be configured to determine that the hot water supply refrigerant has been collected from the exchanger 44.
Since the temperature of the hot water supply refrigerant inlet 44a rapidly rises when there is no hot water supply refrigerant, the controller 1a has no hot water supply refrigerant at the hot water supply refrigerant inlet 44a when the temperature increase rate of the hot water supply refrigerant inlet 44a is large. It can be determined that the hot water supply refrigerant inside the hot water supply heat source side heat exchanger 44 has been recovered.
Therefore, for example, in step S702b of FIG. 6B, the control device 1a is configured to calculate only the temperature of the hot water supply refrigerant inlet 44a of the hot water supply heat source side heat exchanger 44. Further, in step S703b, the control device 1a calculates the temperature of the hot water supply refrigerant inlet 44a calculated in step S702b and the hot water supply refrigerant inlet calculated when executing step S702b a predetermined unit time (for example, 1 second). The temperature increase rate per unit time of the temperature of the hot water supply refrigerant inlet 44a is calculated from the temperature of 44a.
Then, when the temperature increase rate of the hot water supply refrigerant inlet 44a becomes larger than a predetermined increase rate (for example, 0.5 ° C./second), the control device 1a includes the hot water supply heat source side heat exchanger 44. It is good also as a structure which determines that it was in the state by which the hot water supply refrigerant | coolant was collect | recovered from, and complete | finished the 1st hot water supply refrigerant | coolant collection driving | operation.

When the temperature rise rate of the hot water supply refrigerant outlet 44b of the hot water supply heat source side heat exchanger 44 becomes higher than the above-mentioned predetermined rate of increase instead of the temperature of the hot water supply refrigerant inlet 44a, the control device 1a It may be configured to determine that the hot water supply refrigerant has been recovered from the heat source side heat exchanger 44.
Further, during the second hot water supply refrigerant recovery operation for recovering the hot water supply refrigerant from the intermediate heat exchanger 23, the control device 1a causes the temperature increase rate of the hot water supply refrigerant inlet 23c of the intermediate heat exchanger 23 to be higher than the predetermined increase rate described above. It may be configured that it is determined that the hot water supply refrigerant has been recovered from the intermediate heat exchanger 23 when the temperature increases, and the temperature increase rate of the hot water supply refrigerant outlet 23d of the intermediate heat exchanger 23 increases as described above. It may be configured to determine that the hot water supply refrigerant has been recovered from the intermediate heat exchanger 23 when the rate becomes larger than the rate.
That is, the control device 1a determines the temperature increase rate of the hot water supply refrigerant inlet 44a of the hot water supply side heat exchanger 44, the temperature increase rate of the hot water supply refrigerant outlet 44b, and the temperature increase of the hot water supply refrigerant inlet 23c of the intermediate heat exchanger 23. The end of the hot water supply refrigerant recovery operation (first hot water supply refrigerant recovery operation, second hot water supply refrigerant recovery operation) is determined based on one of the rate, the temperature rise rate of the hot water supply refrigerant outlet 23d, or a combination thereof. Can be configured.
Even if it is such a structure, it is not necessary to arrange | position members (sensor etc.) other than a temperature sensor, and it can be set as the air-conditioning hot-water supply system 100 of a simple structure.

It is also possible to apply this modified example 2 to the air conditioning refrigerant recovery operation (first air conditioning refrigerant recovery operation, second air conditioning refrigerant recovery operation).
When applied to the first air-conditioning refrigerant recovery operation, the control device 1a calculates only the temperature of the cooling air-conditioning refrigerant inlet 24a of the air-conditioning heat source side heat exchanger 24 in step S702a of FIG. The configuration. Furthermore, in step S703a, the control device 1a calculates the temperature of the cooling air conditioning refrigerant inlet 24a calculated in step S702a and the cooling air conditioning calculated when executing step S702a before a predetermined unit time such as 1 second, for example. The temperature increase rate per unit time of the temperature of the cooling air conditioning refrigerant inlet 24a is calculated from the temperature of the refrigerant inlet 24a. Then, when the temperature increase rate of the air conditioning refrigerant inlet 24a during cooling becomes larger than the predetermined increase rate set in advance, the control device 1a receives the air conditioning refrigerant from the heat source side heat exchanger 24 for air conditioning. It is good also as a structure which determines having collect | recovered and complete | finishes the 1st air-conditioning refrigerant | coolant collection | recovery driving | operation.
When the temperature rise rate of the air conditioning refrigerant outlet 24b of the air conditioning heat source side heat exchanger 24 becomes larger than the above-mentioned predetermined rate of increase instead of the temperature of the air conditioning refrigerant inlet 24a, the control device 1a is good also as a structure which determines with the refrigerant | coolant for an air conditioning having been collect | recovered from the heat source side heat exchanger 24 for an air conditioning. ,
Further, during the second air conditioning refrigerant recovery operation for recovering the air conditioning refrigerant from the intermediate heat exchanger 23, the controller 1a causes the temperature increase rate of the cooling air conditioning refrigerant inlet 23a of the intermediate heat exchanger 23 to increase as described above. It is good also as a structure which determines that the refrigerant | coolant for air-conditioning was collect | recovered from the inside of the intermediate heat exchanger 23 when it becomes larger than a rate, and the temperature increase rate of the air-conditioning refrigerant | coolant outlet 23b at the time of the air conditioning of the intermediate heat exchanger 23 A configuration may be adopted in which it is determined that the air-conditioning refrigerant has been recovered from the intermediate heat exchanger 23 when the rate of increase is greater than the predetermined increase rate.
In other words, the control device 1a uses the temperature increase rate of the air conditioning refrigerant inlet 24a of the air conditioning heat source side heat exchanger 24, the temperature increase rate of the cooling air conditioning refrigerant outlet 24b, and the air conditioning air conditioning of the intermediate heat exchanger 23 for cooling. Based on one of the temperature rise rate of the refrigerant inlet 23a, the temperature rise rate of the air conditioning refrigerant outlet 23b, or a combination thereof, the air conditioning refrigerant recovery operation (first air conditioning refrigerant recovery operation, second air conditioning use) It can be configured to determine the end of the refrigerant recovery operation.

DESCRIPTION OF SYMBOLS 1a Control apparatus 5 Air-conditioning refrigerant circuit 6 Hot-water supply refrigerant circuit 21 Air-conditioning compressor 23 Intermediate heat exchanger 23a Cooling air-conditioning refrigerant inlet (second air-conditioning refrigerant inlet)
23b Cooling air-conditioning refrigerant outlet (second air-conditioning refrigerant outlet)
23c Hot water supply refrigerant inlet (second hot water supply refrigerant inlet)
23d Hot water supply refrigerant outlet (second hot water supply refrigerant outlet)
24 Heat source side heat exchanger for air conditioning 24a Air conditioning refrigerant inlet for cooling (first air conditioning refrigerant inlet)
24b Cooling air conditioning refrigerant outlet (first air conditioning refrigerant outlet)
27 Expansion valve for air conditioning (refrigerant shut-off means for air conditioning)
35a, 35b open / close valve (open / close valve for air conditioning heat exchanger)
35c 1st control valve (control valve for air conditioning heat exchanger)
35d Second control valve (control valve for air conditioning heat exchanger)
41 Hot-water supply compressor 43 Hot-water supply expansion valve (hot-water supply refrigerant shut-off means)
44 Heat source side heat exchanger for hot water supply 44a Hot water supply refrigerant inlet (first hot water supply refrigerant inlet)
44b Hot water supply refrigerant outlet (first hot water supply refrigerant outlet)
49a Third control valve (control valve for hot water supply heat exchanger)
49b, 49d On-off valve (on-off valve for hot water heat exchanger)
49c 4th control valve (control valve for hot water supply heat exchanger)
100 Air conditioning hot water supply system TH9, TH10, TH22, TH23 Temperature sensor (temperature measuring means for air conditioning)
TH13, TH14, TH15, TH16 Temperature sensor (temperature measuring means for hot water supply)
TH19 temperature sensor (outside temperature measuring means)

Claims (9)

An air conditioning refrigerant circuit in which an air conditioning refrigerant circulates to form an air conditioning cycle, a hot water supply refrigerant to circulate to form a hot water supply cycle, and a control device,
Heat exchange between the air-conditioning heat source side heat exchanger in the air-conditioning refrigerant circuit and the air in parallel with the air-conditioning heat source side heat exchanger and heat exchange between the hot-water supply refrigerant and the air in the hot-water supply refrigerant circuit An intermediate heat exchanger connected in parallel with the heat source side heat exchanger for hot water supply to exchange heat between the refrigerant for air conditioning and the refrigerant for hot water supply,
The control device includes:
When performing the cooling operation in the air conditioning cycle and the hot water supply operation in the hot water supply cycle at the same time,
A first operation to be performed in a first state in which the intermediate heat exchanger is not used and the heat source side heat exchanger for air conditioning and the heat source side heat exchanger for hot water supply are used;
The second operation executed in the second state in which the intermediate heat exchanger is used without using the heat source side heat exchanger for air conditioning and the heat source side heat exchanger for hot water supply is switched based on a predetermined condition. An air conditioning hot water supply system to be controlled,
The control device includes:
When switching between the first operation and the second operation,
The air conditioning refrigerant shut-off means shuts off the inflow of the air conditioning refrigerant to the intermediate heat exchanger and the air conditioning heat source side heat exchanger, and operates the air conditioning compressor provided in the air conditioning refrigerant circuit to An air conditioning refrigerant recovery operation for recovering the air conditioning refrigerant from the intermediate heat exchanger and the air conditioning heat source side heat exchanger;
The hot water supply refrigerant shut-off means shuts off the flow of the hot water supply refrigerant to the intermediate heat exchanger and the hot water supply heat source side heat exchanger, and operates the hot water supply compressor provided in the hot water supply refrigerant circuit to An air conditioning and hot water supply system that performs at least one of a hot water supply refrigerant recovery operation for recovering the hot water supply refrigerant from an intermediate heat exchanger and the hot water supply heat source side heat exchanger. A first air-conditioning refrigerant inlet serving as an inlet for the air-conditioning refrigerant to the air-conditioning heat source-side heat exchanger during the cooling operation in the air-conditioning cycle; and the air-conditioning from the air-conditioning heat source-side heat exchanger during the cooling operation. From the first air conditioning refrigerant outlet serving as a refrigerant outlet, the second air conditioning refrigerant inlet serving as the air conditioning refrigerant inlet to the intermediate heat exchanger during the cooling operation, and the intermediate heat exchanger from the intermediate heat exchanger during the cooling operation Air-conditioning temperature measuring means for measuring the temperature of the second air-conditioning refrigerant outlet serving as the outlet of the air-conditioning refrigerant;
When the control device executes the refrigerant recovery operation for air conditioning,
At least one of a temperature difference between the first air-conditioning refrigerant inlet and the first air-conditioning refrigerant outlet and a temperature difference between the second air-conditioning refrigerant inlet and the second air-conditioning refrigerant outlet;
Alternatively, the temperature rise rate of the first air conditioning refrigerant inlet, the temperature rise rate of the first air conditioning refrigerant outlet, the temperature rise rate of the second air conditioning refrigerant inlet, and the temperature of the second air conditioning refrigerant outlet At least one of the rate of increase,
The air conditioning hot water supply system according to claim 1, wherein the end of the air conditioning refrigerant recovery operation is determined based on the air conditioning. A first air-conditioning refrigerant inlet that serves as an inlet for the air-conditioning refrigerant to the air-conditioning heat source side heat exchanger during the cooling operation in the air-conditioning cycle; From the first air conditioning refrigerant outlet serving as a refrigerant outlet, the second air conditioning refrigerant inlet serving as the air conditioning refrigerant inlet to the intermediate heat exchanger during the cooling operation, and the intermediate heat exchanger from the intermediate heat exchanger during the cooling operation Air-conditioning temperature measuring means for measuring the temperature of the second air-conditioning refrigerant outlet serving as the outlet of the air-conditioning refrigerant, and outside air temperature measuring means for measuring the outside air temperature,
When the control device executes the refrigerant recovery operation for air conditioning,
The temperature difference between the temperature of the first air conditioning refrigerant inlet and the outside air temperature, the temperature difference between the first air conditioning refrigerant outlet and the outside air temperature, and the temperature difference between the temperature of the second air conditioning refrigerant inlet and the outside air temperature The end of the air-conditioning refrigerant recovery operation is determined based on at least one of a temperature difference between the temperature of the second air-conditioning refrigerant outlet and the outside air temperature. The air conditioning hot water supply system described. A first hot water supply refrigerant inlet serving as an inlet of the hot water supply refrigerant to the hot water supply heat source side heat exchanger during the hot water supply operation in the hot water supply cycle, and for the hot water supply from the hot water supply heat source side heat exchanger during the hot water supply operation A first hot water supply refrigerant outlet serving as a refrigerant outlet, a second hot water supply refrigerant inlet serving as an inlet for the hot water supply refrigerant to the intermediate heat exchanger during the hot water operation, and an intermediate heat exchanger from the intermediate heat exchanger during the hot water operation Hot water supply temperature measuring means for measuring the temperature of the second hot water supply refrigerant outlet serving as the outlet of the hot water supply refrigerant;
When the controller performs the hot water supply refrigerant recovery operation,
At least one of a temperature difference between the first hot water supply refrigerant inlet and the first hot water supply refrigerant outlet and a temperature difference between the second hot water supply refrigerant inlet and the second hot water supply refrigerant outlet;
Alternatively, the temperature increase rate of the first hot water supply refrigerant inlet, the temperature increase rate of the first hot water supply refrigerant outlet, the temperature increase rate of the second hot water supply refrigerant inlet, and the temperature of the second hot water supply refrigerant outlet At least one of the rate of increase,
The air conditioning hot water supply system according to any one of claims 1 to 3, wherein the end of the hot water supply refrigerant recovery operation is determined based on the above. A first hot water supply refrigerant inlet serving as an inlet of the hot water supply refrigerant to the hot water supply heat source side heat exchanger during the hot water supply operation in the hot water supply cycle, and for the hot water supply from the hot water supply heat source side heat exchanger during the hot water supply operation A first hot water supply refrigerant outlet serving as a refrigerant outlet, a second hot water supply refrigerant inlet serving as an inlet for the hot water supply refrigerant to the intermediate heat exchanger during the hot water operation, and an intermediate heat exchanger from the intermediate heat exchanger during the hot water operation Hot water supply temperature measurement means for measuring the temperature of the second hot water supply refrigerant outlet serving as the outlet of the hot water supply refrigerant, and outside air temperature measurement means for measuring the outside air temperature,
When the controller performs the hot water supply refrigerant recovery operation,
The temperature difference between the temperature of the first hot water supply refrigerant inlet and the outside air temperature, the temperature difference between the temperature of the first hot water supply refrigerant outlet and the outside air temperature, the temperature difference between the temperature of the second hot water supply refrigerant inlet and the outside air temperature, The end of the hot water supply refrigerant recovery operation is determined based on at least one of the temperature difference between the temperature of the second hot water supply refrigerant outlet and the outside air temperature. The air conditioning hot water supply system according to any one of claims 3 to 4. The control device includes:
When performing the cooling operation in the air conditioning cycle and the hot water supply operation in the hot water supply cycle at the same time, the air conditioning heat radiation amount in the air conditioning refrigerant circuit and the hot water supply heat absorption amount in the hot water refrigerant circuit are calculated,
When the air-conditioning heat dissipation amount and the hot water supply heat absorption amount are equal, the second operation is executed in the second state, and heat is exchanged between the hot water supply refrigerant and the air conditioning refrigerant in the intermediate heat exchanger. ,
When the air-conditioning heat dissipation amount and the hot water supply heat absorption amount are not equal, the first operation is executed in the first state, and heat exchange is performed between the atmosphere and the air-conditioning refrigerant in the air-conditioning heat source side heat exchanger. And heat exchange between the atmosphere and the hot water supply refrigerant in the hot water supply heat source side heat exchanger. Air conditioning and hot water supply system. The control device includes:
When performing the cooling operation in the air conditioning cycle and the hot water supply operation in the hot water supply cycle at the same time, the air conditioning heat radiation amount in the air conditioning refrigerant circuit and the hot water supply heat absorption amount in the hot water refrigerant circuit are calculated,
When the air-conditioning heat dissipation amount and the hot water supply heat absorption amount are equal, the second operation is executed in the second state, and heat is exchanged between the hot water supply refrigerant and the air conditioning refrigerant in the intermediate heat exchanger. ,
When the air-conditioning heat dissipation amount and the hot water supply heat absorption amount are not equal, the first operation is executed in the first state, and heat exchange is performed between the atmosphere and the air-conditioning refrigerant in the air-conditioning heat source side heat exchanger. In addition, the air-conditioning hot water supply system according to claim 4, wherein heat is exchanged between the atmosphere and the hot water supply refrigerant by the hot water supply heat source side heat exchanger. The control device includes:
When performing the cooling operation in the air conditioning cycle and the hot water supply operation in the hot water supply cycle at the same time, the air conditioning heat radiation amount in the air conditioning refrigerant circuit and the hot water supply heat absorption amount in the hot water refrigerant circuit are calculated,
When the air-conditioning heat dissipation amount and the hot water supply heat absorption amount are equal, the second operation is executed in the second state, and heat is exchanged between the hot water supply refrigerant and the air conditioning refrigerant in the intermediate heat exchanger. ,
When the air-conditioning heat dissipation amount and the hot water supply heat absorption amount are not equal, the first operation is executed in the first state, and heat exchange is performed between the atmosphere and the air-conditioning refrigerant in the air-conditioning heat source side heat exchanger. The air-conditioning hot water supply system according to claim 5, wherein heat is exchanged between the atmosphere and the hot water supply refrigerant by the hot water supply heat source side heat exchanger. An air conditioning refrigerant circuit in which an air conditioning refrigerant circulates to form an air conditioning cycle, a hot water supply refrigerant to circulate to form a hot water supply cycle, and a control device,
Heat exchange between the air-conditioning heat source side heat exchanger in the air-conditioning refrigerant circuit and the air in parallel with the air-conditioning heat source side heat exchanger and heat exchange between the hot-water supply refrigerant and the air in the hot-water supply refrigerant circuit A control method for an air conditioning and hot water supply system comprising an intermediate heat exchanger that is connected in parallel with the hot water supply heat source side heat exchanger to exchange heat between the air conditioning refrigerant and the hot water supply refrigerant,
When the control device performs a cooling operation in the air conditioning cycle and a hot water supply operation in the hot water supply cycle at the same time,
Calculating an air-conditioning heat dissipation amount in the air-conditioning refrigerant circuit, and a hot-water supply heat absorption amount in the hot-water supply refrigerant circuit;
Comparing the air conditioning heat dissipation amount and the hot water supply heat absorption amount;
When the air-conditioning heat dissipation amount and the hot water supply amount are not equal, the first operation is performed in the first state in which the intermediate heat exchanger is not used and the air-conditioning heat source side heat exchanger and the hot water supply heat source side heat exchanger are used. A step of performing
When the air-conditioning heat dissipation amount and the hot-water supply amount are equal, the second operation is performed in the second state in which the intermediate heat exchanger is used without using the air-conditioning heat source side heat exchanger and the hot water supply heat source side heat exchanger. And performing the steps
Furthermore, at the time of switching between the first operation and the second operation,
Shutting off the inflow of the air conditioning refrigerant to the intermediate heat exchanger and the heat source side heat exchanger by the air conditioning refrigerant shut-off means, and operating the air conditioning compressor provided in the air conditioning refrigerant circuit, An air conditioning refrigerant recovery operation comprising a step of recovering the air conditioning refrigerant from an intermediate heat exchanger and the air conditioning heat source side heat exchanger;
Shutting off the flow of the hot water supply refrigerant into the intermediate heat exchanger and the hot water source heat exchanger with the hot water supply refrigerant shut-off means, and operating the hot water supply compressor provided in the hot water supply refrigerant circuit A hot water supply refrigerant recovery operation comprising a step of recovering the hot water supply refrigerant from an intermediate heat exchanger and the hot water supply heat source side heat exchanger;
A method for controlling an air conditioning and hot water supply system comprising the step of executing at least one of the following.

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