JP2018063091A - Heat pump water heater with cooling function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely secure heating capacity of water to a hot water storage tank.SOLUTION: An outdoor fan control portion 410D increases an outdoor fan rotating speed N2 in an outdoor fan 67 according to lowering of an indoor fan rotating speed N1 in an indoor fan 66. As the outdoor fan rotating speed N2 is corrected to a high rotating speed side even when a heat absorbing amount in an indoor heat exchanger 27 is reduced due to reduction of the indoor fan rotating speed N1 with lapse of time after start of an operation, a heat absorbing amount in an outdoor heat exchanger 17 can be increased.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a heat pump water heater with a cooling function capable of performing boiling and cooling operations in which indoor air cooling and hot water in a hot water storage tank are heated in parallel.

  Conventionally, in this type of water heater, as described in Patent Document 1, a water refrigerant heat exchanger as a condenser is connected to the discharge side of the compressor during the boiling and cooling operation, and condensation is performed on the downstream side thereof. In some cases, an indoor heat exchanger as an evaporator is connected, and a heat pump heat exchanger (outdoor heat exchanger) as an evaporator is connected downstream thereof.

Japanese Patent No. 4610688

  During boiling / cooling operation, the heat load in the indoor heat exchanger generally increases immediately after the operation starts, so the heat absorption amount in the indoor heat exchanger increases. The endothermic amount at becomes small. In the above prior art, in such a case, the heat radiation amount in the water-refrigerant heat exchanger located on the upstream side is also reduced, so from the viewpoint of reliably ensuring the heating capacity of water to the hot water storage tank, There was a problem that it was not enough.

  In order to solve the above-described problems, in claim 1 of the present invention, an indoor heat exchanger as an evaporator that performs heat exchange between the refrigerant and room air, a hot water storage tank that stores hot water, a refrigerant passage, and a water passage. A water refrigerant heat exchanger as a condenser that exchanges heat between the refrigerant in the refrigerant passage and water in the water passage, and an evaporator that exchanges heat between the refrigerant and outside air. A heat pump heat exchanger and a compressor, the water passage of the water-refrigerant heat exchanger and the hot water storage tank are annularly connected by hot water piping to form a hot water circulation circuit, and the indoor heat exchanger The refrigerant passage of the water refrigerant heat exchanger, the heat pump heat exchanger, and the compressor are connected by a refrigerant pipe to form a refrigerant circulation circuit, and the indoor air is cooled by the indoor heat exchanger, and To the hot water storage tank by the water refrigerant heat exchanger In the heat pump water heater with a cooling function capable of performing boiling and cooling operations for heating the refrigerant, the refrigerant pipe connects the discharge side of the compressor to the inlet side of the refrigerant passage of the water refrigerant heat exchanger, Furthermore, the outlet side of the refrigerant passage of the water refrigerant heat exchanger is connected to the inlet side of the indoor heat exchanger, and the outlet side of the indoor heat exchanger is connected to the inlet side of the heat pump heat exchanger. Furthermore, the outlet side of the heat pump heat exchanger is connected to the suction side of the compressor, and the load detecting means detects the cooling load in the indoor heat exchanger, and is detected by the load detecting means An endothermic control means for increasing the endothermic amount in the heat pump heat exchanger is provided when the cooling load is reduced.

  According to a second aspect of the present invention, the refrigerant pipe includes a first pipe that connects between a discharge side of the compressor and an inlet side of the refrigerant passage of the water refrigerant heat exchanger, and the water refrigerant heat exchanger. A second pipe connecting between the outlet side of the refrigerant passage and the inlet side of the indoor heat exchanger; and a second pipe connecting between the outlet side of the indoor heat exchanger and the inlet side of the heat pump heat exchanger. 3 piping, and 4th piping which connects between the exit side of the said heat pump heat exchanger, and the suction side of the said compressor, In said 2nd piping, valve opening degree is variable according to an operating state. A controlled decompressor is provided.

  According to a third aspect of the present invention, the fan further includes a blower fan that sends outside air to the heat pump heat exchanger, and the heat absorption control unit is triggered by a decrease in the cooling load detected by the load detection unit. This is rotation control means for increasing the number of rotations.

  According to a fourth aspect of the present invention, there is further provided a cooling fan that is controlled in rotation based on at least the room temperature and blows out cool air from the indoor heat exchanger into the room, and the load detecting means detects the number of rotations of the cooling fan. The heat absorption control means increases the heat absorption amount in the heat pump heat exchanger when the number of rotations of the cooling fan detected by the rotation detection means decreases.

  Further, according to a fifth aspect of the present invention, the load detecting unit further includes a detection unit that detects the room temperature, and the load detection unit is configured to detect a temperature difference between a detected indoor temperature value detected by the detecting unit and a set indoor temperature value set by a user The heat absorption control means increases the heat absorption amount in the heat pump heat exchanger when the temperature difference calculated by the calculation means decreases.

  According to the first aspect of the present invention, the discharge side of the compressor is connected to the refrigerant passage of the water refrigerant heat exchanger by the refrigerant pipe, and the refrigerant passage of the water refrigerant heat exchanger is connected to the indoor heat exchanger. Further, the indoor heat exchanger is connected to the heat pump heat exchanger, and the heat pump heat exchanger is connected to the suction side of the compressor. As a result, the high-temperature and high-pressure refrigerant gas discharged from the compressor dissipates heat to the hot water piping that leads to the hot water storage tank in the water refrigerant heat exchanger, condenses into a liquid refrigerant, and then evaporates in the indoor heat exchanger, thereby After absorbing heat, it is further evaporated by a heat pump heat exchanger to absorb heat from the outside air and return to the compressor. Thus, boiling / cooling operation is realized in which the indoor air is cooled and the water to the hot water storage tank is heated.

  In this boiling / cooling operation, as described above, the heat absorption in the indoor heat exchanger (functioning as an evaporator) and the heat absorption in the heat pump heat exchanger (functioning as an evaporator) are totaled. What has been used is used for heating hot water in the water refrigerant heat exchanger (functioning as a condenser). At this time, although the cooling load is usually large immediately after the start of operation, the heat absorption amount in the indoor heat exchanger increases, but as the time passes, the cooling load decreases, so the heat absorption amount in the indoor heat exchanger is small. Become.

  Correspondingly, according to claim 1, a load detecting means and an endothermic control means are provided. When the cooling load detected by the load detection unit decreases as described above, the heat absorption control unit increases the heat absorption amount in the heat pump heat exchanger correspondingly. As a result, since the amount of heat absorbed by the indoor heat exchanger can be compensated for as described above, the sum of the heat absorbed by the indoor heat exchanger and the heat absorbed by the heat pump heat exchanger is small. Can be maintained. As a result, the heat radiation amount in the water refrigerant heat exchanger can be maintained without lowering, and the water heating capacity to the hot water storage tank can be reliably ensured.

  Further, according to claim 2, during the boiling / cooling operation, the compressor discharge side → the first pipe → the water / refrigerant heat exchanger → the second pipe → the indoor heat exchanger → the third pipe → the heat pump heat exchanger → A refrigerant path from the fourth pipe to the compressor suction side is formed. And the valve opening degree of the decompressor provided in the said 2nd piping is variably controlled. In this case, in the refrigerant path, the refrigerant after heat exchange with the water refrigerant heat exchanger can be reliably expanded to a low temperature and low pressure state in the decompressor of the second pipe and supplied to the indoor heat exchanger. Thereby, the highly efficient driving | operation using the heating (exhaust heat) of the water to a hot water storage tank can be performed. )

  According to the third aspect of the present invention, when a decrease in the cooling load is detected, the rotation control means increases the rotation speed of the blower fan that sends outside air into the heat pump heat exchanger. As a result, the amount of heat exchange between the refrigerant and the room air increases, so that the amount of heat absorbed in the heat pump heat exchanger can be reliably increased.

  According to claim 4, the number of rotations of the cooling fan provided in the indoor heat exchanger is controlled based on the room temperature. Therefore, for example, when the cooling load is large, the rotational speed of the cooling fan is high, and when the cooling load is small, the rotational speed of the cooling fan is low. Corresponding to this, according to the fourth aspect of the present invention, a rotation detecting means for detecting the number of rotations of the cooling fan is provided as the load detecting means. When the number of rotations of the cooling fan detected by the rotation detection unit decreases, the amount of heat absorbed in the heat pump heat exchanger increases due to the control of the heat absorption control unit (because the cooling load is small). As a result, the sum of the heat absorption amount in the indoor heat exchanger and the heat absorption amount in the heat pump heat exchanger can be reliably maintained.

  According to claim 5, the actual room temperature is detected by the detecting means. For example, when the difference between the room temperature setting value set by the user with a remote controller or the like and the room temperature detection value by the detection means is large, the cooling load is large. Conversely, when the difference is small, the cooling load is small. Correspondingly, according to claim 5, a calculation means for calculating a temperature difference between the detected indoor temperature value and the set indoor temperature value is provided as the load detecting means. When the temperature difference calculated by the calculating means decreases, the heat absorption amount in the heat pump heat exchanger increases under the control of the heat absorbing control means (because the cooling load is small). As a result, the sum of the heat absorption amount in the indoor heat exchanger and the heat absorption amount in the heat pump heat exchanger can be reliably maintained.

1 is an external configuration diagram of main units of a heat pump water heater with a cooling function according to an embodiment of the present invention. Circuit diagram of the entire heat pump water heater Functional configuration diagram of heat-pump control unit Functional configuration diagram of hot water storage control unit Functional configuration diagram of air conditioner control unit Diagram explaining operation during boiling operation The figure explaining the action at the time of heating operation Diagram explaining operation during boiling and heating operation The figure explaining the action at the time of cooling operation Diagram explaining operation during boiling / cooling operation The figure explaining the control content of the outdoor fan rotation speed in an outdoor fan control part The figure explaining the action | operation at the time of boiling-up and air_conditionaing | cooling operation in the modification in which an outdoor fan control part controls outdoor fan rotation speed based on indoor temperature and an air-conditioner preset temperature. Functional configuration diagram of heat-pump control unit Functional configuration diagram of air conditioner control unit The figure explaining the control content of the outdoor fan rotation speed in an outdoor fan control part

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows an external configuration of a main unit of a heat pump water heater 1 with a cooling function (but also with a heating function) according to the present embodiment. In FIG. 1, a heat pump water heater 1 of this embodiment includes a hot water storage unit 100 provided with a hot water storage tank 2 (see FIG. 2 and the like described later), a heat pump unit 300 as an outdoor unit, and an air conditioner unit 200 as an indoor unit. have.

  FIG. 2 shows a circuit configuration of the entire heat pump water heater 1 of the present embodiment. As shown in FIG. 2, the hot water storage unit 100 includes a refrigerant-side flow path 15 b and a water-side flow path 15 a for circulating the refrigerant, and exchanges heat between the high-temperature and high-pressure refrigerant and the hot water in the hot water storage tank 2. A water refrigerant heat exchanger 15 that functions as a condenser that performs heating, and a boiling pump 19. That is, the water-side flow path 15a of the water-refrigerant heat exchanger 15 and the hot water storage tank 2 are annularly connected by a heating forward pipe 5 and a heating return pipe 6 serving as hot water piping, and hot water is stored in the hot water storage unit 100. A heating circulation circuit 4 as a circulation circuit is formed.

  The heating forward pipe 5 is connected to the lower part of the hot water storage tank 2, and the heating return pipe 6 is connected to the upper part of the hot water storage tank 2. The boiling pump 19 is provided in the middle of the heating forward pipe 5, and the hot water from the heating forward pipe 5 is circulated to the heating return pipe 6 through the water-side flow path 15a while Circulate hot water. The heating forward pipe 5 is provided with an incoming water temperature sensor 23 for detecting an incoming water temperature T1 (hot water inlet temperature) flowing into the water-side flow path 15a of the water-refrigerant heat exchanger 15. The return pipe 6 is provided with a boiling temperature sensor 24 for detecting a boiling temperature Tb flowing out from the water-side flow path 15a toward the hot water storage tank 2.

  A plurality of hot water storage temperature sensors 12 for detecting the temperature of hot water in the hot water storage tank 2 (hot water storage temperature) and detecting the heating status of the hot water (in other words, the status of hot water storage) are provided on the side surface of the hot water storage tank 2. ing. A water supply pipe 7 for supplying water to the hot water storage tank 2 is connected to the lower part of the hot water storage tank 2, and a hot water discharge pipe 8 for discharging hot water stored therein is also connected to the upper part of the hot water storage tank 2. A water supply bypass pipe 9 is branched from the water supply pipe 7. Furthermore, a mixing valve 10 that mixes the hot water from the tap water pipe 8 and the water from the water supply bypass pipe 9 into hot water at a hot water supply set temperature, and a hot water temperature sensor 11 that detects the hot water temperature after mixing by the mixing valve 10; , Is provided.

  On the other hand, the refrigerant circulation circuit 30 capable of heating hot water in the hot water storage tank 2 by heat exchange (details will be described later) in the water refrigerant heat exchanger 15 includes the heat pump unit 300, the hot water storage unit 100, and the air conditioner unit 200. It is provided over. The refrigerant circuit 30 includes a heat pump circuit unit 30A disposed in the heat pump unit 300, a hot water storage circuit unit 30B disposed in the hot water storage unit 100, and an air conditioner circuit unit 30C disposed in the air conditioner unit 200. Including.

  The heat-pump circuit unit 30A includes a refrigerant pipe 18 serving as a flow path for the refrigerant, and a condenser or an evaporator by heat exchange between the compressor 14 that compresses the refrigerant, a four-way valve 31, and the refrigerant and outside air. And an outdoor heat exchanger 17 as a heat pump heat exchanger that selectively functions (details will be described later) are connected by the refrigerant pipe 18. The outdoor heat exchanger 17 is provided with an outdoor fan 67 as a blower fan for passing outside air through the outdoor heat exchanger 17.

  Specifically, the refrigerant pipe 18 is connected to the pipe section 18a via the pipe section 18a on the discharge side of the compressor 14 and the four-way valve 31 during the boiling operation (see FIG. 6 described later). And a piping part 18b. The pipe portion 18 b communicates with a communication conduit 101 that connects the heat pump unit 300 and the hot water storage unit 100 at a connection port 68 a that is an outlet to the outside of the heat pump unit 300.

  The refrigerant pipe 18 is connected to the pipe portion 18c on the suction side of the compressor 14 and the compressor 14 side (in other words, the boiling point) of the outdoor heat exchanger 17 during a boiling operation (see FIG. 6 described later). The outlet side during the upper operation, etc. The same applies hereinafter (see FIG. 6 and the like to be described later) and the piping part 18d for connecting to the piping part 18c via the four-way valve 31, and the anti-compressor 14 side of the outdoor heat exchanger 17 ( In other words, it includes a piping portion 18e connected to the inlet side during the above-mentioned boiling operation, etc., and so on (see FIG. 6 and the like described later). The pipe portion 18e includes an expansion valve 113, and communicates with a communication pipe line 102 that connects the heat pump unit 300 and the hot water storage unit 100 at a connection port 68b different from the connection port 68a.

  The four-way valve 31 is a valve having four ports, and the remaining pipe portions are respectively connected to the two ports for the pipe portions 18b and 18d (which constitute the refrigerant main path) in the refrigerant pipe 18. Which of the two ports for 18a and 18c is connected is switched. The two ports for the pipe portions 18a and 18c are connected to each other by a refrigerant sub route including the pipe portions 18a and 18c arranged in a loop shape, and the compressor 14 is provided on the refrigerant sub route. ing. For example, when the four-way valve 31 is switched to the state shown in FIG. 6 described later (hereinafter referred to as “switching to the heating side” or the like as appropriate), the pipe portion 18a on the discharge side of the compressor 14 is connected to the water. When connected to the pipe section 18b on the inlet side of the refrigerant heat exchanger 15 and switched to the state shown in FIG. 9 described later (hereinafter referred to as “switching to the cooling side” as appropriate), the pipe section 18a. Is communicated with the pipe portion 18d on the outdoor heat exchanger 17 side.

  The compressor 14, the four-way valve 31, the outdoor heat exchanger 17, the outdoor fan 67, the expansion valve 113, and the like are included in the housing of the heat pump unit 300 (see FIG. 1).

  The hot water storage circuit section 30 </ b> B includes a refrigerant pipe 25 that serves as the refrigerant flow path, and the refrigerant-side flow path 15 b of the water-refrigerant heat exchanger 15 is connected to the refrigerant pipe 25.

  Specifically, the refrigerant pipe 25 is connected to a pipe part 25a communicating with the communication pipe line 101 at a connection port 75a serving as an outlet to the outside of the hot water storage unit 100, and branched from the pipe part 25a. A pipe section 25b whose pipe section 25a side is connected to the inlet side of the water refrigerant heat exchanger 15 (specifically, the refrigerant-side flow path 15b), and the water refrigerant heat exchanger 15 (specifically, the refrigerant-side heat exchanger 15 And a piping part 25c connected to the outlet side of the flow path 15b). The pipe part 25b includes a two-way valve 121 that can open and close the pipe part 25b on the inlet side of the four-way valve 31 and the water-refrigerant heat exchanger 15, and the pipe part 25c has a fully-closed function. An expansion valve 111 is provided.

  The refrigerant pipe 25 includes a pipe part 25d branched from the pipe part 25a and connected in the same manner as the pipe part 25b. The side of the pipe portion 25d opposite to the pipe portion 25a communicates with a communication conduit 104 that connects the hot water storage unit 100 and the air conditioner unit 200 at a connection port 95a serving as an outlet to the outside of the hot water storage unit 100.

  Further, the refrigerant pipe 25 is branched and connected from the anti-water refrigerant heat exchanger 15 side of the pipe part 25c, and the anti-pipe part 25c side is connected to the communication pipe at a connection port 75b different from the connection port 75a. A piping portion 25e communicating with the passage 102, a piping portion 25f communicating the piping portion 25d and the piping portion 25e, and the piping portion 25c branch off from the anti-water refrigerant heat exchanger 15 side in the same manner as the piping portion 25e. In addition, a connection port 95b serving as an outlet to the outside of the hot water storage unit 100 includes a piping portion 25g that communicates with the communication pipe 103 that connects the hot water storage unit 100 and the air conditioner unit 200. The pipe part 25d includes a two-way valve 122 that can open and close the pipe part 25d between a connection point with the pipe part 25a and a connection point with the pipe part 25f. A two-way valve 123 capable of opening and closing the pipe part 25e is provided between a connection point with the part 25g and a connection point with the pipe part 25f, and the pipe part 25f is a two-way valve capable of opening and closing the pipe part 25f. 124, and the piping part 25g is provided with an expansion valve 112 having a fully-closed function as a decompressor. As a result, the two-way valve 123 has a function of opening and closing a pipe line between the expansion valve 113 and the expansion valve 112, and the expansion valve 111 is connected to the outlet side of the water refrigerant heat exchanger 15 and the A function of opening and closing a pipe line between the expansion valve 112 and the expansion valve 112 is provided. The communication conduit 101 has a function of communicating the two-way valves 121 and 122 and the four-way valve 31, and the communication conduit 102 connects the two-way valves 123 and 124 and the expansion valve 113. It has a function to communicate. In other words, the hot water storage unit 100 and the heat pump unit 300 are connected by the communication pipes 101 and 102 (see also FIG. 1).

  The two-way valves 121, 122, 123, 124, the expansion valves 111, 112, the water / refrigerant heat exchanger 15, the hot water storage tank 2, and the like are included in the casing of the hot water storage unit 100 (FIG. 1). reference). The expansion valve 112 may be provided in a piping part 26b described later (that is, in the casing of the air conditioner unit 200).

  The air conditioner circuit section 30C includes a refrigerant pipe 26 that serves as a flow path for the refrigerant, and indoor heat that selectively functions as a condenser or an evaporator (details will be described later) by heat exchange between the refrigerant and room air. An exchanger 27 is connected to the refrigerant pipe 26. The indoor heat exchanger 27 is provided with an indoor fan 77 (functioning as a cooling fan during cooling operation and boiling / cooling operation) for passing indoor air through the indoor heat exchanger 27.

  Specifically, the refrigerant pipe 26 communicates with the communication pipe 104 at a connection port 76 a serving as an outlet to the outside of the air conditioner unit 200, and the anti-communication pipe 104 side is the connection port 76 a of the indoor heat exchanger 27. The pipe portion 26a connected to the side (in other words, the inlet side during heating operation, the same applies hereinafter, see FIG. 7 and the like) and the communication pipe 103 communicate with the connection port 76b different from the connection port 76a. In addition, the anti-communicating pipe line 103 side is connected to the connecting port 76b side of the indoor heat exchanger 27 (in other words, the outlet side during heating operation, the same applies hereinafter; see FIG. 7 and the like described later) Is included. As a result, the two-way valve 122 has a function of opening and closing a pipe line between the pipe portion 26a on the side of the anti-expansion valve 112 of the indoor heat exchanger 27 and the compressor 14, and the two-way valve 124. Is provided with a function of opening and closing a pipe line between the piping part 26 a on the side of the anti-expansion valve 112 of the indoor heat exchanger 27 and the expansion valve 113. The communication line 103 has a function of communicating the expansion valve 112 with the expansion valve 112 side of the indoor heat exchanger 27, and the communication line 104 includes the two-way valves 122 and 124 and the The indoor heat exchanger 27 has a function of communicating with the anti-expansion valve 112 side. In other words, the hot water storage unit 100 and the air conditioner unit 200 are connected by the communication conduits 103 and 104 (see also FIG. 1).

  The indoor heat exchanger 27, the indoor fan 77, and the like are included in the casing of the air conditioner unit 200 (see FIG. 1).

  In the refrigerant circuit 30, for example, R32 refrigerant is used as a refrigerant to constitute a heat pump cycle. The refrigerant may be an HFC refrigerant, an HFO refrigerant, or a carbon dioxide refrigerant. And in the refrigerant | coolant piping 18 of the said heat-pon circuit part 30A, the discharge temperature sensor 20 which detects the refrigerant | coolant discharge temperature Tout discharged from the compressor 14 is provided in the said piping part 18a, The said piping part 18c has A suction temperature sensor 32 that detects the refrigerant suction temperature Tin of the refrigerant sucked into the compressor 14 is provided. An outdoor air temperature sensor 22 for detecting the outdoor air temperature Tair is provided on the air inlet side of the outdoor heat exchanger 17, and the heat exchanger heat exchange temperature Tex (acts as an evaporator) in the outdoor heat exchanger 17. A heat exchange temperature sensor 35 is provided for detecting the temperature of the evaporative refrigerant during The detection results of these sensors 20, 32, 22, and 35 are input to a heat pump control unit 410 provided in the heat pump unit 300 and further provided in the hot water storage control unit 420 and the air conditioner unit 200 provided in the hot water storage unit 100 as appropriate. It is also input to the air conditioner control unit 430 (which may be received via the heat pump control unit 410 or may be received directly from the sensors 20, 32, 22).

  In addition, in the refrigerant pipe 25 of the hot water storage circuit section 30B, the pipe section 25c is provided with an outflow temperature sensor 21 that detects the refrigerant outflow temperature T2 that flows out from the refrigerant-side flow path 15b and travels toward the expansion valve 111. It has been. The water refrigerant heat exchanger 15 is provided with a condensing temperature sensor 33 that detects a refrigerant condensing temperature when the refrigerant condenses in the flow path 15b on the refrigerant side. The detection results of these sensors 21 and 33 are input to a hot water storage control unit 420 provided in the hot water storage unit 100, and further, the heat pump control unit 410 provided in the heat pump unit 300 and the air conditioner unit 200 as appropriate. It is also input to the air conditioner control unit 430 (may be received via the hot water storage control unit 420 or may be received directly from the sensors 21 and 33).

  Further, with respect to the refrigerant pipe 26 of the air conditioner circuit unit 30C, the indoor heat exchanger 27 is provided with an indoor temperature sensor 34 as detection means for detecting the indoor temperature Tr of the air-conditioning target space. The detection results of these sensors 34 are input to an air conditioner control unit 430 provided in the air conditioner unit 200, and the hot water storage control provided in the heat pump control unit 410 provided in the heat pump unit 300 or the hot water storage unit 100 as appropriate. Also input to the unit 420 (may be received via the air conditioner control unit 430 or may be received directly from the sensor 34).

  The hot water storage control unit 420 of the hot water storage unit 100, the heat pump control unit 410 of the heat pump unit 300, and the air conditioner control unit 430 of the air conditioner unit 200 are connected to be communicable with each other. Based on the detection result, the operation of each device / actuator in the hot water storage unit 100, the heat pump unit 300, and the air conditioner unit 200 is controlled in cooperation with each other. In particular, the hot water in the hot water storage tank 2 is heated by controlling the opening / closing operation and the opening degree of the two-way valves 121, 122, 123, and 124 and the expansion valves 111, 112, and 113 and switching the flow path of the refrigerant. (Supplying heated hot water) and performing boiling operation, cooling operation for cooling the air-conditioned space, heating operation for heating the air-conditioned space, boiling and cooling in parallel The boiling / cooling operation performed in this manner, and the boiling / heating operation performed in parallel with the boiling and heating can be selectively executed.

  At this time, the air conditioner unit 200 can be operated by an appropriate operation unit 60 (hereinafter simply referred to as “remote controller 60”) such as a remote controller. That is, the remote controller 60 is connected to, for example, the air conditioner control unit 430 so as to be able to transmit and receive information, and the user manually operates the remote controller 60 appropriately to thereby perform the above-described boiling operation, cooling operation, and heating. It is possible to instruct which driving operation is performed. Regarding boiling / cooling operation (or boiling / heating operation), when the user gives an instruction for the cooling operation (or heating operation) via the remote controller 60, the state of hot water storage in the hot water storage tank 2 (unheated water) Depending on the amount of the water and the like) and automatically switching to the boiling / cooling operation (or boiling / heating operation) as appropriate. Further, by appropriate operation on the remote controller 60, the boiling mode during the boiling operation (for example, the strong boiling mode, the normal boiling mode, etc.), and the air conditioner operation mode (for example, the powerful mode) during the cooling operation or heating operation. Mode, normal mode, power saving mode, etc.), air conditioner set temperature Tcon, etc. can also be instructed. The contents of instructions from these remote controllers 60 are input to the air conditioner control unit 430 provided in the air conditioner unit 200, and further, the heat pump control unit 410 provided in the heat pump unit 300 and the hot water storage unit 100 as appropriate. It is also input to hot water storage control unit 420 (may be received via air conditioner control unit 430 or may be received directly from remote control 60).

  Next, the heat pump control unit 410 provided in the heat pump unit 300 will be described. Although not shown in detail, the heat-pon control unit 410 includes a storage unit that stores various data and programs, and a control unit that performs calculation / control processing. The functional configuration of the heat-pon control unit 410 will be described with reference to FIG.

  As shown in FIG. 3, the heat pump control unit 410 functionally includes a four-way valve control unit 410A, a compressor control unit 410B, an expansion valve control unit 410C, and an outdoor fan control unit 410D.

  The four-way valve control unit 410A is instructed by the remote controller 60 as to which operation to perform (boiling operation, cooling operation, heating operation), and the hot water storage temperature detected by the hot water storage temperature sensor 12. Are entered. The four-way valve control unit 410A actually operates the heat pump water heater 1 in accordance with the operation instruction and the heating state (hot water storage state) of the hot water corresponding to the hot water storage temperature (boiling operation, cooling operation). Operation, boiling / cooling operation, heating operation, boiling / heating operation), and corresponding operation information includes the compressor control unit 410B, the expansion valve control unit 410C, the outdoor fan control unit 410D, And it outputs to the hot water storage control part 420 and the air-conditioner control part 430. The four-way valve control unit 410A outputs an opening / closing signal corresponding to the determined operation mode to the four-way valve 31, and switches the four-way valve 31 (detailed control content will be described later).

  The compressor control unit 410B includes the outside air temperature Tair detected by the outside air temperature sensor 22, the indoor temperature Tr detected by the indoor temperature sensor 34, and the air conditioner set temperature Tcon set by the remote controller 60. And the boiling mode are input (in addition to the case of direct input, the indirect input is also included, and so on). The compressor control unit 410B is input from the four-way valve control unit 410A as described above (any of boiling operation, cooling operation, boiling / cooling operation, heating operation, and boiling / heating operation is performed). The number of rotations of the compressor 14 is controlled based on at least one of the input temperature and setting according to the operation information (detailed control content will be described later). The rotation speed (control value) of the compressor 14 at this time is also output to an expansion valve control unit 420B of a hot water storage control unit 420 (not shown).

  The expansion valve control unit 410C includes the refrigerant discharge temperature Tout detected by the discharge temperature sensor 20, the refrigerant outflow temperature T2 detected by the outflow temperature sensor 21, and the intake temperature sensor 32. The refrigerant suction temperature Tin and the heat-pon heat exchange temperature Tex detected by the heat exchange temperature sensor 35 are input. The expansion valve control unit 410C controls the opening of the expansion valve 113 based on at least one of the input temperatures in accordance with the operation information from the four-way valve control unit 410A (detailed control). The contents will be described later).

  The outdoor fan control unit 410D outputs the outside air temperature Tair detected by the outside air temperature sensor 22, the air conditioner operation mode set by the remote controller 60, and the output from the indoor fan control unit 430A of the air conditioner control unit 430 described later. The target rotational speed N1 (details will be described later) of the indoor fan 77 is input. The outdoor fan control unit 410D corresponds to the operation information from the four-way valve control unit 410A, and according to the outdoor air temperature Tair, the operation mode, and the target rotational speed N1 of the indoor fan 77, the outdoor fan 67. On the other hand, a drive control signal corresponding to the target rotational speed N2 (hereinafter simply referred to as “outdoor fan rotational speed N2”, also shown in the drawing) is output, thereby variably controlling the rotational speed of the outdoor fan 67 (details). The details of the control will be described later).

  The operation mode may be determined by the hot water storage control unit 420 or the air conditioner control unit 430. In this case, the operation information corresponding to the determined operation mode is input to the heat pump control unit 410 from the hot water storage control unit 420 and the air conditioner control unit 430, and the four-way valve control unit 410A according to the input operation information. The compressor control unit 410B, the expansion valve control unit 410C, and the outdoor fan control unit 410D perform various controls.

  Next, the hot water storage control unit 420 provided in the hot water storage unit 100 will be described. The hot water storage control unit 420 includes a storage unit and a control unit, similar to the heat pump control unit 410, and its functional configuration will be described with reference to FIG.

  As shown in FIG. 4, the hot water storage control unit 420 functionally includes a pump control unit 420A, an expansion valve control unit 420B, and a two-way valve control unit 420C.

  The operation information from the heat pump control unit 410 and the boiling temperature Tb detected by the boiling temperature sensor 24 are input to the pump control unit 420A. The pump control unit 420A is input from the heat pump control unit 410 as described above (whether boiling operation, cooling operation, boiling / cooling operation, heating operation, or boiling / heating operation is performed). The number of rotations of the boiling pump 19 is controlled based on the inputted boiling temperature Tb in accordance with the operation information (detailed control content will be described later).

  The expansion valve control unit 420B includes the operation information from the heat pump control unit 410, the outside air temperature Tair detected by the outside air temperature sensor 22, the air conditioner operation mode set by the remote controller 60, and the heat pump. The rotation speed of the compressor 14 (control value, but the actual rotation speed of the compressor 14 detected by a known method may be input) input from the compressor control section 410B of the control section 410; The refrigerant outflow temperature T2 detected by the outflow temperature sensor 21, the refrigerant intake temperature Tin detected by the intake temperature sensor 32, and the refrigerant discharge temperature Tout detected by the discharge temperature sensor 20 are input. The The expansion valve control unit 420B is configured to open the openings of the expansion valves 111 and 112 based on at least one of the input temperature, mode setting, and rotation speed in accordance with the operation information from the heat pump control unit 410. (Details of control contents will be described later).

  The operation information from the heat pump control unit 410 is input to the two-way valve control unit 420C. The two-way valve control unit 420C controls the opening / closing operation of the two-way valves 121, 122, 123, and 124 based on the operation information (detailed control content will be described later).

  As described above, the operation mode may be determined in the hot water storage control unit 420 (for example, the two-way valve control unit 420C) or the air conditioner control unit 430. In this case, the pump control unit 420A, the expansion valve control unit 420B, and the two-way valve control unit 420C perform various controls according to the operation information corresponding to the operation mode determined by the two-way valve control unit 420C and the air conditioner control unit 430. I do.

  Next, the air conditioner control unit 430 provided in the air conditioner unit 200 will be described. The air conditioner control unit 430 includes a storage unit and a control unit, similar to the heat pump control unit 410 and the hot water storage control unit 420, and its functional configuration will be described with reference to FIG.

  As shown in FIG. 5, the air conditioner control unit 430 functionally includes an indoor fan control unit 430A.

  The indoor fan control unit 430A receives the operation information from the heat-pump control unit 410, the indoor temperature Tr detected by the indoor temperature sensor 34, and the air conditioner set temperature Tcon set by the remote controller 60. Is done. The indoor fan control unit 430A responds to the operation information from the heat-pump control unit 410, and with respect to the indoor fan 77 according to the indoor temperature Tr and the air conditioner set temperature Tcon (hereinafter, as appropriate) A drive control signal corresponding to “indoor fan rotational speed N1” (similarly shown in the figure) is output, and thereby the rotational speed of the indoor fan 77 is variably controlled (detailed control content will be described later). The indoor fan rotation speed N1 is also output to the outdoor fan control unit 410D of the heat pump control unit 410 as described above.

  As described above, the operation mode may be determined in the air conditioner control unit 430 or the hot water storage control unit 420. In this case, the indoor fan control unit 430A performs the control according to the operation information corresponding to the operation mode determined by the air conditioner control unit 430 and the hot water storage control unit 420.

  As described above, the heat pump water heater 1 according to the present embodiment can selectively execute five types of operation including boiling operation, cooling operation, heating operation, boiling / cooling operation, and boiling / heating operation. . Hereinafter, details of each operation will be sequentially described.

  First, boiling operation will be described with reference to FIG. In the boiling operation shown in FIG. 6, the four-way valve control unit 410A causes the four-way valve 31 to connect the pipe part 18a to the pipe part 18b and to connect the pipe part 18c to the pipe part 18d. The position is switched to the heating position (the heating side described above). The two-way valve controller 420C switches the two-way valve 121 to the open state, the two-way valve 122 to the closed state, the two-way valve 123 to the open state, and the two-way valve 124 to the closed state. Further, the expansion valve control unit 420B controls the expansion valve 111 to be in a fully open state and the expansion valve 112 to be in a fully closed state, and the expansion valve control unit 410C opens the expansion valve 113 (details will be described later as ΔH Is being controlled).

  As a result, the discharge side piping section 18a → the piping section 18b → the communication pipe 101 → the piping section 25a → the piping section 25b → the refrigerant side flow path 15b of the water refrigerant heat exchanger 15 → the piping section 25c (expansion). Valve 111) → Pipe part 25e → Communication pipe line 102 → Pipe part 18e (expansion valve 113) → Outdoor heat exchanger 17 → Pipe part 18d → Refrigerant path of the suction side pipe part 18c of the compressor 14 is formed. Thereby, after the refrigerant in the gas state sucked at low temperature and low pressure is compressed by the compressor 14 to become high temperature and high pressure gas, the flow on the refrigerant side of the water refrigerant heat exchanger 15 functioning as a condenser is performed. In the channel 15b, heat exchange is performed with the water flowing through the water-side channel 15a to release heat to the water and change into a high-pressure liquid while heating. The refrigerant thus turned into a liquid is decompressed by the expansion valve 113 through the fully opened expansion valve 111 and becomes a low-temperature / low-pressure liquid and easily evaporates. In the outdoor heat exchanger 17 functioning as an evaporator, The heat is exchanged with the outside air to evaporate and change into gas, thereby absorbing heat and returning to the compressor 14 again as a low temperature / low pressure gas. At this time, the low-temperature water (unheated water) taken out from the heating forward pipe 5 connected to the lower part of the hot water storage tank 2 receives heat from the condensing refrigerant in the water-side flow path 15a of the water-refrigerant heat exchanger 15. Then, after being heated to a high temperature, the hot water is returned to the hot water storage tank 2 from the heating return pipe 6 connected to the upper part of the hot water storage tank 2 so that the hot water (heated water) is sequentially stored in the hot water storage tank 2 in a laminated form. The

  In the above operation, the rotational speed of the compressor 14 is determined based on the outside air temperature Tair under the control of the compressor controller 410B. That is, when the outside air temperature Tair is low, the compressor rotation speed is controlled to be large, and when the outside air temperature Tair is high, the compressor rotation speed is controlled to be small. The outdoor fan rotation speed N2 of the outdoor fan 67 is determined based on the outdoor air temperature Tair under the control of the outdoor fan control unit 410D. That is, when the outside air temperature Tair is low, the fan rotation speed is controlled to be large, and when the outside air temperature Tair is high, the fan rotation speed is controlled to be small.

  The number of rotations of the boiling pump 19 is feedback-controlled by the control of the pump control unit 420A so that the boiling temperature Tb becomes a predetermined target temperature. That is, when the boiling temperature Tb is lower than the target temperature, control is performed such that the pump rotational speed is decreased (the flow rate is decreased), and when the boiling temperature Tb is higher than the target temperature, the pump rotational speed is increased (the flow rate is decreased). To be increased). The indoor fan 77 is stopped from rotating under the control of the indoor fan control unit 430A.

  The opening degree of the expansion valve 113 is variably controlled by the expansion valve control unit 410C according to the operating state of the boiling operation. Specifically, the opening of the expansion valve 113 is set at a predetermined cycle so that the temperature difference ΔH = Tout−T2 between the refrigerant discharge temperature Tout and the refrigerant outflow temperature T2 becomes a predetermined target temperature difference ΔHm. Perform feedback control (ΔH control). That is, the expansion valve control unit 410C controls the opening degree of the expansion valve 113 to close when ΔH <ΔHm, and opens the opening degree of the expansion valve 113 when ΔH> ΔHm. If ΔH = ΔHm, the opening degree of the expansion valve 113 is maintained as it is. Alternatively, instead of the ΔH control, the opening degree of the expansion valve 113 may be feedback controlled so that the refrigerant discharge temperature Tout becomes a predetermined constant value (discharge control). In this case, the expansion valve control unit 410C controls the opening degree of the expansion valve 113 to close when the refrigerant discharge temperature Tout is too low, and opens the opening degree of the expansion valve 113 when the refrigerant discharge temperature Tout is too high. Control in the direction.

  Next, the heating operation will be described with reference to FIG. In the heating operation shown in FIG. 7, the four-way valve 31 is switched to the heating side by the four-way valve control unit 410A as in the boiling operation. The two-way valve controller 420C switches the two-way valve 121 to the closed state, the two-way valve 122 to the open state, the two-way valve 123 to the open state, and the two-way valve 124 to the closed state. Further, the expansion valve control unit 420B controls the expansion valve 111 to be fully closed and the expansion valve 112 to be fully open, and the expansion valve control unit 410C opens the expansion valve 113 (detailed below is SH control). Is controlled).

  As a result, the piping part 18a on the discharge side of the compressor 14 → the piping part 18b → the communication line 101 → the piping part 25a → the piping part 25d → the communication line 104 → the piping part 26a → the indoor heat exchanger 27 → the piping part 26b → Communication pipe 103 → pipe part 25g (expansion valve 112) → pipe part 25e → communication pipe line 102 → pipe part 18e (expansion valve 113) → outdoor heat exchanger 17 → pipe part 18d → pipe on the suction side of the compressor 14 A refrigerant path of the portion 18c is formed. As a result, after the refrigerant in the gas state sucked at low temperature and low pressure is compressed by the compressor 14 to become high temperature and high pressure gas, the indoor heat exchanger 27 functioning as a condenser exchanges heat with the indoor air. The heat is released to change into a high-pressure liquid while heating the air-conditioning target space. The refrigerant thus turned into a liquid is decompressed in the expansion valve 113 through the fully opened expansion valve 112 and becomes a low-temperature / low-pressure liquid and easily evaporates. In the outdoor heat exchanger 17 functioning as an evaporator, The heat is exchanged with the outside air to evaporate and change into gas, thereby absorbing heat and returning to the compressor 14 again as a low temperature / low pressure gas.

  In the above operation, the rotation speed of the compressor 14 is determined based on the difference between the room temperature Tr and the air conditioner set temperature Tcon under the control of the compressor control unit 410B. That is, when the value of Tcon-Tr is large, the compressor rotational speed is controlled to be large, and when the value of Tcon-Tr is small, the compressor rotational speed is controlled to be small. The outdoor fan rotation speed N2 of the outdoor fan 67 is determined based on the outdoor air temperature Tair and the air conditioner operation mode under the control of the outdoor fan control unit 410D. That is, in each of a plurality of prepared air conditioner operation modes (for example, the high power mode, the normal mode, the power saving mode, etc.), when the outside air temperature Tair is low, the fan speed is controlled to increase, and when the outside air temperature Tair is high. The fan speed is controlled to be small.

  The indoor fan rotation speed N1 of the indoor fan 77 is determined based on the difference between the indoor temperature Tr and the air conditioner set temperature Tcon under the control of the indoor fan control unit 430A. That is, when the value of Tcon-Tr is large, control is performed so that the fan rotational speed is increased, and when the value of Tcon-Tr is small, control is performed so that the fan rotational speed is decreased. The boiling pump 19 is stopped from rotating under the control of the pump control unit 420A.

  The opening degree of the expansion valve 113 is variably controlled by the expansion valve control unit 410C according to the operating state of the heating operation. Specifically, the opening degree of the expansion valve 113 is feedback-controlled so that the temperature difference Tin-Tex between the refrigerant suction temperature Tin and the heat-pump heat exchange temperature Tex becomes a predetermined constant value (SH control). That is, the expansion valve control unit 410C controls the opening of the expansion valve 113 to close when Tin-Tex is too small, and controls the opening of the expansion valve 113 to open when Tin-Tex is too large. To do.

  Next, boiling and heating operation will be described with reference to FIG. Also in the boiling / heating operation shown in FIG. 8, the four-way valve control unit 410A switches the four-way valve 31 to the heating side. The two-way valve controller 420C switches the two-way valve 121 to the open state, the two-way valve 122 to the open state, the two-way valve 123 to the open state, and the two-way valve 124 to the closed state. Further, the expansion valve control unit 420B controls the expansion valve 111 to be in a fully open state and the expansion valve 112 to be in a fully open state, and the expansion valve control unit 410C opens the expansion valve 113 (details are the discharge control described later). To be controlled).

  As a result, the refrigerant path is divided into two through the piping part 18a on the discharge side of the compressor 14 → the piping part 18b → the communication pipe 101 → the piping part 25a, and one is the piping part 25b → the water refrigerant heat exchanger 15. The refrigerant side flow path 15b → pipe part 25c (expansion valve 111) is reached to the pipe part 25e, and the other is the pipe part 25d → communication conduit 104 → pipe part 26a → indoor heat exchanger 27 → pipe part 26b → It joins to the said piping part 25e through the communication pipe line 103-> piping part 25g (expansion valve 112). The subsequent path is the piping portion 25e → the communication conduit 102 → the piping portion 18e (expansion valve 113) → the outdoor heat exchanger 17 → the piping portion 18d → the suction side piping portion 18c of the compressor 14.

  As a result, the refrigerant in the gas state sucked at a low temperature and a low pressure is compressed by the compressor 14 to become a high temperature and a high pressure gas, and then divided as described above, and the one flow is the water refrigerant heat exchanger. 15 (functions as a condenser) is condensed in the same manner as described above to heat the water flowing through the water-side flow path 15a, thereby supplying hot water (heated water) sequentially into the hot water storage tank 2, and the other flow is In the indoor heat exchanger 27 (functioning as a condenser), the air-conditioning target space is heated by condensing in the same manner as described above and releasing heat to the indoor air. The refrigerant that has changed into a high-pressure liquid by condensation in the heat exchangers 15 and 27 is decompressed by the expansion valve 113 to become a low-temperature / low-pressure liquid, and then in the outdoor heat exchanger 17 (functions as an evaporator). It evaporates and absorbs heat from the outside air, and returns to the compressor 14 again as a low temperature / low pressure gas.

  In the above operation, the rotation speed of the compressor 14 is determined based on the difference between the indoor temperature Tr and the air conditioner set temperature Tcon, as in the heating operation, under the control of the compressor control unit 410B. The determination based on the outside air temperature Tair, which is the same as in the upper operation, is taken into account (details are omitted). The outdoor fan rotation speed N2 is controlled by the outdoor fan control unit 410D, based on the outdoor air temperature Tair and the air conditioner operation mode, as in the heating operation, when the outdoor air temperature Tair is low in each air conditioner operation mode. When the outside air temperature Tair is high, the fan rotational speed is controlled to be small so that the rotational speed is large.

  The number of revolutions of the boiling pump 19 is controlled by the pump control unit 420A, as in the above-described boiling operation, when the boiling temperature Tb is lower than the target temperature, the number of revolutions of the pump becomes small, and the boiling temperature Tb is When the temperature is higher than the target temperature, the pump speed is controlled to be large. The indoor fan rotation speed N1 is controlled by the indoor fan control unit 430A, based on the difference between the indoor temperature Tr and the air conditioner set temperature Tcon, as in the heating operation, when the value of Tcon-Tr is large. When the value of Tcon-Tr is small, the fan rotational speed is controlled to be small so that the rotational speed is large.

  The opening degree of the expansion valve 113 is variably controlled by the expansion valve control unit 410C according to the operating state of the boiling / heating operation. Specifically, the opening degree of the expansion valve 113 is feedback controlled (discharge control) so that the refrigerant discharge temperature Tout becomes a predetermined constant value, and when the refrigerant discharge temperature Tout is too low, the opening degree of the expansion valve 113 is closed. If the refrigerant discharge temperature Tout is too high, the opening of the expansion valve 113 is controlled to open.

  Next, the cooling operation will be described with reference to FIG. In the cooling operation shown in FIG. 9, the four-way valve control unit 410A causes the four-way valve 31 to connect the pipe part 18a to the pipe part 18d and to connect the pipe part 18c to the pipe part 18b. It is switched to a position (cooling side different from the heating side). Further, the two-way valve control unit 420C switches the two-way valve 121 to the closed state, the two-way valve 122 to the open state, the two-way valve 123 to the open state, and the two-way valve 124 to the closed state as in the heating operation. It is done. Further, the expansion valve control unit 420B controls the expansion valve 111 to be in a fully closed state and the expansion valve 112 to be in an open state (specifically, feedforward control described below is performed), and the expansion valve control The expansion valve 113 is controlled to be fully opened by the portion 410C.

  As a result, the piping section 18a on the discharge side of the compressor 14 → the piping section 18d → the outdoor heat exchanger 17 → the piping section 18e (expansion valve 113) → the communication conduit 102 → the piping section 25e → the piping section 25g (expansion valve 112). → Communication line 103 → Pipe part 26b → Indoor heat exchanger 27 → Pipe part 26a → Communication line 104 → Pipe part 25d → Pipe part 25a → Communication line 101 → Pipe part 18b → Piping on the suction side of the compressor 14 A refrigerant path of the portion 18c is formed. Thereby, after the refrigerant in the gas state sucked at low temperature and low pressure is compressed by the compressor 14 to become high temperature and high pressure gas, the outdoor heat exchanger functioning as a condenser with the rotational driving of the outdoor fan 67. In 17, heat is exchanged with the outside air to release heat and change to a high-pressure liquid. The refrigerant that has become liquid in this manner is decompressed by the expansion valve 112 through the fully opened expansion valve 113 and becomes a low-temperature / low-pressure liquid that easily evaporates, and functions as an evaporator when the indoor fan 77 is driven to rotate. The indoor heat exchanger 27 absorbs heat from the indoor air, evaporates and changes to gas, thereby cooling the air-conditioning target space and returns to the compressor 14 again as low-temperature and low-pressure gas.

  In the above operation, as in the heating operation, the rotation speed of the compressor 14 is controlled by the compressor control unit 410B so that the compressor rotation speed increases when the value of Tcon-Tr is large. When the value of Tcon-Tr is small, the compressor rotational speed is controlled to be small. The outdoor fan rotation speed N2 of the outdoor fan 67 is controlled by the outdoor fan control unit 410D so that the fan rotation speed is increased when the air conditioner operation mode is, for example, the high power mode. In this case, the fan speed is controlled to be small. Further, in each air-conditioner operation mode, control is performed so that the fan speed decreases when the outside air temperature Tair is low, and the fan speed increases when the outside air temperature Tair is high. The indoor fan rotation speed N1 of the indoor fan 77 is controlled by the indoor fan control unit 430A so that the value of the Tcon-Tr increases so that the fan rotation speed increases when the Tcon-Tr value is large. When it is small, the fan speed is controlled to be small. The boiling pump 19 is stopped from rotating under the control of the pump control unit 420A.

  The opening degree of the expansion valve 112 is variably controlled by the expansion valve control unit 420B according to the operating state of the cooling operation. That is, it is determined based on the outside air temperature Tair, the air conditioner operation mode, and the rotational speed of the compressor 14. That is, the expansion valve control unit 420B determines whether the outside air temperature Tair is high or low and the compressor from the compressor control unit 410B in each of the plurality of air conditioner operation modes (for example, the strong mode, the normal mode, and the power saving mode). The opening degree of the expansion valve 112 is feedforward controlled in consideration of the rotational speed (details are omitted).

  Next, boiling / cooling operation will be described with reference to FIG. In the boiling / cooling operation shown in FIG. 10, the four-way valve control unit 410A switches the four-way valve 31 to the heating side (not the cooling side). Further, the two-way valve controller 420C switches the two-way valve 121 to the open state, the two-way valve 122 to the closed state, the two-way valve 123 to the closed state, and the two-way valve 124 to the open state. Further, the expansion valve control unit 420B controls the expansion valve 111 to be in a fully open state and the expansion valve 112 to be in an open state (detailed below, ΔH control is performed). The expansion valve 113 is controlled to be fully opened by the portion 410C.

  As a result, the refrigerant path is the piping side 18a on the discharge side of the compressor 14 → the piping part 18b → the communication pipe 101 → the piping part 25a → the piping part 25b → the flow path 15b on the refrigerant side of the water refrigerant heat exchanger 15 → the piping. Part 25c (expansion valve 111) → piping part 25g (expansion valve 112) → communication pipe line 103 → piping part 26b → indoor heat exchanger 27 → piping part 26a → communication pipe line 104 → piping part 25d → piping part 25f → piping Portion 25e → Communication pipeline 102 → Pipe portion 18e (expansion valve 113) → Outdoor heat exchanger 17 → Pipe portion 18d → Pipe portion 18c on the suction side of the compressor 14

  Thus, after the refrigerant in the gas state sucked at low temperature and low pressure is compressed by the compressor 14 to become high temperature and high pressure gas, first, the water refrigerant heat exchanger 15 (functioning as a condenser) is used in the same manner as described above. The high-temperature water (heated water) is sequentially supplied into the hot water storage tank 2 by heating the water flowing through the water-side flow path 15a and the liquid refrigerant passes through the expansion valve 111 in a fully opened state. The expansion valve 112 is depressurized to become a low-temperature / low-pressure liquid and easily evaporates. When the indoor fan 77 is driven to rotate, the indoor heat exchanger 27 functioning as an evaporator absorbs heat from the indoor air and evaporates. The air-conditioning target space is cooled by changing to the above, and further, through the expansion valve 113, the outdoor fan 67 rotates and exchanges heat with the outside air in the outdoor heat exchanger 17 that functions as an evaporator. Evaporated to me it absorbs heat by varying the gas returns to the compressor 14 as a low-temperature low-pressure gas.

  As described above, the pipe 18a, the pipe 25a, and the pipe 25b connect between the discharge side of the compressor 14 and the inlet side of the water refrigerant heat exchanger 15. It functions as the first piping. The piping part 25c, the piping part 25g, and the piping part 26b function as a second pipe that connects between the outlet side of the water-refrigerant heat exchanger 15 and the inlet side of the indoor heat exchanger 27. In addition, the piping part 26a, the piping part 25d (excluding the section with the two-way valve 122), the piping part 25f, the piping part 25e (excluding the section with the two-way valve 123), the piping part 18e, It functions as a third pipe that connects the outlet side of the indoor heat exchanger 27 and the inlet side of the outdoor heat exchanger 17. Further, the pipe portion 18d and the pipe portion 18c function as a fourth pipe that connects the outlet side of the outdoor heat exchanger 17 and the suction side of the compressor 14.

  In the above operation, the rotation speed of the compressor 14 is determined based on the difference between the room temperature Tr and the air conditioner set temperature Tcon, similar to that during the cooling operation, under the control of the compressor control unit 410B.

  The number of rotations of the boiling pump 19 is controlled by the pump control unit 420A, as in the case of the boiling operation and the boiling / heating operation, when the boiling temperature Tb is lower than the target temperature. When the boiling temperature Tb is higher than the target temperature, the pump rotation speed is controlled to increase. The indoor fan rotation speed N1 of the indoor fan 77 is controlled by the indoor fan control unit 430A based on the difference between the indoor temperature Tr and the air conditioner set temperature Tcon as in the cooling operation or the like. When the value of is large, the fan rotational speed is increased, and when the value of Tcon-Tr is small, the fan rotational speed is decreased.

  The opening degree of the expansion valve 112 is variably controlled by the expansion valve control unit 420B in accordance with the operating state of the boiling / cooling operation. Specifically, similar to the control to the expansion valve 113 by the expansion valve control unit 410C during the boiling operation, the temperature difference ΔH = Tout−T2 between the refrigerant discharge temperature Tout and the refrigerant outflow temperature T2 is a predetermined value. The opening degree of the expansion valve 112 is feedback-controlled at a predetermined cycle so that the target temperature difference ΔHm is obtained (ΔH control). That is, the expansion valve control unit 420B controls the opening degree of the expansion valve 112 to close when ΔH <ΔHm, and opens the opening degree of the expansion valve 112 when ΔH> ΔHm. If ΔH = ΔHm, the opening degree of the expansion valve 112 is maintained as it is. Alternatively, instead of this ΔH control, the opening degree of the expansion valve 112 may be feedback controlled so that the refrigerant discharge temperature Tout becomes a predetermined constant value (discharge control). In this case, the expansion valve control unit 420B controls the opening degree of the expansion valve 112 to close when the refrigerant discharge temperature Tout is too low, and opens the opening degree of the expansion valve 112 when the refrigerant discharge temperature Tout is too high. Control in the direction. The control of the outdoor fan rotation speed N2 in the outdoor fan 67 by the control of the outdoor fan control unit 410D will be described later.

  By the way, in the above boiling / cooling operation, the heat absorption in the indoor heat exchanger 27 (functioning as an evaporator) and the outdoor heat exchanger 17 ( The sum of the heat absorption in the evaporator) is used for heating the hot water into the hot water storage tank 2 in the water refrigerant heat exchanger 15 (functioning as a condenser).

  Here, in the present embodiment, as in the normal method, in the indoor fan control unit 430A of the air conditioner control unit 430, when the value of the indoor temperature Tr-air conditioner set temperature Tcon is large, the indoor fan rotation speed N1 increases. As described above, when the value of the indoor temperature Tr-the air conditioner set temperature Tcon is small, the indoor fan rotation speed N1 is controlled to be small. Therefore, immediately after the start of operation when Tr-Tcon representing the cooling load is large, the indoor fan rotation speed N1 is large and the heat absorption amount in the indoor heat exchanger 27 is large, but the Tr-Tcon is small as time passes thereafter. Accordingly, since the indoor fan rotation speed N1 is reduced, the heat absorption amount in the indoor heat exchanger 27 is reduced.

  Accordingly, in this embodiment, the indoor fan control unit 430A outputs the indoor fan rotation speed N1 to the outdoor fan control unit 410D that controls the outdoor fan rotation speed N2 of the outdoor fan 67. (Functions as rotation detection means and load detection means of the indoor fan control unit 430A). When the outdoor fan control unit 410D detects a decrease in the indoor fan rotation speed N1 corresponding to the decrease in the heat absorption amount, the outdoor fan control unit 410D increases the outdoor fan rotation speed N2 in the outdoor fan 67 in response to this, The heat absorption amount in the outdoor heat exchanger 17 is increased (functions as rotation control means and heat absorption control means of the outdoor fan control unit 410D). Hereinafter, details of the control contents by the outdoor fan control unit 410D will be described with reference to FIG.

  As shown by the characteristic line of the lower right in FIG. 11A, the outdoor fan rotation speed N2 of the outdoor fan 67 is controlled by the outdoor fan control unit 410D so as to increase when the outdoor air temperature Tair is low, When the outside air temperature Tair is high, it is controlled to be small. As in the case of the cooling operation, the control content represented by the downward-sloping characteristic line is prepared separately for each air-conditioner operation mode, and FIG. 11 (a) shows one of the operations. The mode is shown as an example.

  As described above, the outdoor fan control unit 410D increases the outdoor fan rotation speed N2 of the outdoor fan 67 in accordance with a decrease in the indoor fan rotation speed N1 of the indoor fan 66. In this example, among the three characteristic lines as shown in the figure, the characteristic lines to be used are switched in stages so that the characteristic line on the higher rotational speed side becomes a characteristic line as the indoor fan rotational speed N1 decreases. Specifically, as shown in FIG. 11B, there are three ranges of the indoor fan rotation speed N1, N1 <200 [rpm], 200 ≦ N1 <300 [rpm], and 300 ≦ N1 [rpm]. Divide into

  When the indoor fan rotation speed N1 is in the range of 300 ≦ N1 [rpm], which is the largest among the three sections, the outdoor fan control unit 410D uses the outdoor fan rotation speed N2 (as a control reference). Control is performed so that the characteristic indicated by the solid line at the bottom in FIG. When the indoor fan rotation speed N1 is in the range of 200 ≦ N1 <300 [rpm] in the middle of the three sections, the outdoor fan control unit 410D determines the outdoor fan rotation speed N2 as shown in FIG. A characteristic obtained by adding a correction value 100 [rpm] (see FIG. 11B) to the characteristic indicated by the solid line at the bottom in a), that is, the middle part in FIG. 11A that is one stage higher than the solid line. Control is performed so as to obtain the characteristics indicated by the two-dot chain line. Further, when the indoor fan rotation speed N1 is in the range of the smallest N1 <200 [rpm] among the three sections, the outdoor fan control unit 410D determines the outdoor fan rotation speed N2 as shown in FIG. A characteristic obtained by adding a correction value 200 [rpm] (see FIG. 11B) to the characteristic indicated by the solid line at the bottom in FIG. 11A, that is, one level above the two-dot chain line in FIG. Control is performed so that the characteristic indicated by the upper broken line is obtained.

  By performing such control in the outdoor fan control unit 410D, the indoor fan rotation speed N1 decreases with the passage of time after the start of operation as described above, and the heat absorption amount in the indoor heat exchanger 27 decreases. Even if this occurs, the amount of heat absorbed in the outdoor heat exchanger 17 can be increased by correcting the outdoor fan rotational speed N2 to the high rotational speed side as described above.

  As described above, according to the heat pump water heater 1 of the present embodiment, when the cooling load decreases after the start of operation, the heat absorption amount in the outdoor heat exchanger 17 is increased correspondingly. As a result, the amount of heat absorbed by the indoor heat exchanger 27 can be compensated for as described above, so the sum of the heat absorbed by the indoor heat exchanger 27 and the heat absorbed by the outdoor heat exchanger 17 can be compensated. However, it can be kept small. As a result, since the heat radiation amount in the water-refrigerant heat exchanger 15 can be maintained without lowering, the hot water heating capacity to the hot water storage tank 2 can be reliably ensured.

  Further, in the present embodiment, in particular, during the boiling / cooling operation shown in FIG. 10, the discharge side of the compressor 14 → pipe parts 18 b, 25 a, 25 b → water refrigerant heat exchanger 15 → pipe parts 25 c, 25 g, 26 b → The refrigerant path is formed as follows: indoor heat exchanger 27 → piping sections 26a, 25d, 25f, 25e, 18e → outdoor heat exchanger 17 → piping sections 18d, 18c → the suction side of the compressor 14. An expansion valve 112 whose valve opening degree is variably controlled according to the operating state is provided in the piping portion 25g. In this case, in the refrigerant path, the refrigerant after heat exchange by the water refrigerant heat exchanger 15 can be reliably expanded to a low temperature and low pressure state by the expansion valve 112 and supplied to the indoor heat exchanger 27. Thereby, the highly efficient driving | operation using the heating (exhaust heat) of the water to the hot water storage tank 2 can be performed.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not change the summary of invention.

  For example, in the above-described embodiment, the indoor fan rotation speed N1 controlled according to the value of the indoor temperature Tr−the air conditioner set temperature Tcon (= temperature difference ΔT; hereinafter, simply referred to as “temperature difference ΔT”) is Output from the indoor fan control unit 430A to the outdoor fan control unit 410D, the outdoor fan control unit 410D detects that the cooling load has decreased due to the decrease in the indoor fan rotation speed N1, and increases the outdoor fan rotation speed N2. I let you. Instead, the indoor temperature Tr and the air conditioner set temperature Tcon are directly input to the outdoor fan control unit 410D, and the outdoor fan control unit 410D reduces the cooling load due to the decrease in the temperature difference ΔT based on them. This may be detected and the outdoor fan rotation speed N2 may be increased.

  FIG. 12 shows the operation during boiling / cooling operation in such a modification, and FIG. 13 and FIG. 14 corresponding to FIG. 3 and FIG. 5 respectively show the functional configurations of the heat pump control unit and the air conditioner control unit. . As shown in FIG. 14, in this modification, the indoor fan rotation speed N1 (drive control signal) from the indoor fan control unit 430A is output to the indoor fan 77, and the outdoor fan control as in the above embodiment. It is not output to unit 410D. As shown in FIG. 13, in addition to the outdoor temperature Tair and the air conditioner operation mode, the indoor temperature Tr detected by the indoor temperature sensor 34 and the remote controller 60 are set in the outdoor fan control unit 410D. The air conditioner set temperature Tcon is input.

  The outdoor fan control unit 410D calculates a temperature difference ΔT (= indoor temperature Tr−air conditioner set temperature Tcon) according to the input room temperature Tr and the air conditioner set temperature Tcon (calculation means, load detection means). As a function). The temperature difference ΔT may be calculated by another part (for example, the compressor control unit 410B), and the calculated temperature difference Δ may be input to the outdoor fan control unit 410D for use. When the outdoor fan control unit 410D detects a decrease in the temperature difference ΔT corresponding to the decrease in the heat absorption amount, the outdoor fan control unit 410D increases the outdoor fan rotation speed N2 in the outdoor fan 67 in response to this, thereby increasing the outdoor heat. The heat absorption amount in the exchanger 17 is increased (functions as rotation control means and heat absorption control means of the outdoor fan control unit 410D).

  Details of the control contents of the outdoor fan control unit 410D in this modification will be described with reference to FIG. 15 corresponding to FIG.

  As shown in FIG. 15A, the outdoor fan rotation speed N2 of the outdoor fan 67 is increased by the outdoor fan control unit 410D when the outdoor air temperature Tair is low, as shown by the characteristic line that descends to the right in FIG. When the outside air temperature Tair is high, it is controlled to be small.

  As described above, the outdoor fan control unit 410D increases the outdoor fan rotation speed N2 in accordance with a decrease in the temperature difference ΔT (= Tr−Tcon). In this example, in the three characteristic lines prepared in the same manner as in FIG. 11, as the temperature difference ΔT decreases, the characteristic lines to be used are switched step by step so as to become a characteristic line on the higher rotational speed side. . That is, as shown in FIG. 15B, the temperature difference ΔT is divided into three ranges: ΔT <5 [° C.], 5 ≦ ΔT <10 [° C.], 10 ≦ ΔT [° C.]. Break down.

  When the temperature difference ΔT is the largest range of 10 ≦ ΔT [° C.] among the three sections, the outdoor fan control unit 410D uses the outdoor fan rotation speed N2 (as a control reference). Control is performed so that the characteristic indicated by the solid line at the bottom in FIG. When the temperature difference ΔT is in the range of 5 ≦ ΔT <10 [° C.] in the middle of the three sections, the outdoor fan control unit 410D determines the outdoor fan rotation speed N2 as shown in FIG. A characteristic obtained by adding a correction value 100 [rpm] (see FIG. 15B) to the characteristic indicated by the solid line at the bottom in a), that is, the middle part in FIG. 15A that is one stage above the solid line. Control is performed so as to obtain the characteristics indicated by the two-dot chain line. Furthermore, when the temperature difference ΔT is the smallest ΔT <5 [° C.] of the three sections, the outdoor fan control unit 410D determines the outdoor fan rotation speed N2 as shown in FIG. A characteristic obtained by adding a correction value 200 [rpm] (see FIG. 15B) to the characteristic indicated by the solid line at the bottom in FIG. 15A, that is, one stage higher than the two-dot chain line in FIG. Control is performed so that the characteristic indicated by the upper broken line is obtained.

  When such control is performed by the outdoor fan control unit 410D, the temperature difference ΔT (= indoor temperature Tr−air conditioner set temperature Tcon) becomes small with the passage of time after the start of operation as described above, and the indoor heat. Even if the heat absorption amount in the exchanger 27 is small, the outdoor fan rotation speed N2 is corrected to the large rotation speed side as described above, and thus the heat absorption amount in the outdoor heat exchanger 17 is corrected. Can be increased. As a result, the same effect as the above embodiment can be obtained.

  Further, for example, in the above embodiment, when it is detected that the refrigerant load is reduced, the heat absorption amount in the outdoor heat exchanger 17 is increased by increasing the outdoor fan rotation speed N2. Instead, for example, the outdoor heat exchanger 17 is provided with a plurality of sets of modules for performing heat exchange with the outside air as described above, and when the refrigerant load is large, one set is used while the refrigerant load is If it is small, a plurality of sets may be used (function as heat absorption control means) to increase the amount of heat absorption. For example, in the outdoor heat exchanger 17, the route of the refrigerant passage contributing to the heat exchange can be switched between a short-distance route and a long-distance route, and when the refrigerant load is large, the short-distance route is used. On the other hand, when the refrigerant load is small, the long distance route may be used (function as heat absorption control means) to increase the amount of heat absorption.

  Furthermore, the present invention is not limited to the above embodiment, and for example, at least one of the two-way valves 121 to 124 may be replaced with an expansion valve with a closing function. Further, instead of the expansion valves 111 to 113, an ejector may be used as a decompressor.

1 Heat pump water heater 2 Hot water storage tank 4 Heating circulation circuit (hot water circulation circuit)
5 Heating pipe (hot water pipe)
6 Heating return pipe (hot water pipe)
DESCRIPTION OF SYMBOLS 14 Compressor 15 Water refrigerant heat exchanger 15a Refrigerant side flow path 15b Water side flow path 17 Outdoor heat exchanger (heat pump heat exchanger)
18 Refrigerant piping 18a Piping section (first piping)
18c Piping section (4th piping)
18d Piping section (4th piping)
18e Piping section (third piping)
25a Piping section (first piping)
25b Piping section (first piping)
25c Piping section (second piping)
25d Piping section (third piping)
25e Piping section (third piping)
25f Piping section (third piping)
25g Piping section (second piping)
26a Piping section (third piping)
26b Piping section (second piping)
27 Indoor heat exchanger 30 Refrigerant circulation circuit 31 Four-way valve 34 Indoor temperature sensor (detection means)
67 Outdoor fan (fan)
77 Indoor fan (cooling fan)
100 Hot water storage unit 112 Expansion valve (pressure reducer)
121 Two-way valve 122 Two-way valve 123 Two-way valve 124 Two-way valve 200 Heat pump unit (outdoor unit)
300 Air conditioner unit (indoor unit)
410 Heat-pump control unit 420 Hot-water storage control unit 430 Air-conditioner control unit N1 Indoor fan rotation speed N2 Outdoor fan rotation speed Tair Outdoor air temperature Tcon Air-conditioner set temperature Tr Indoor temperature

Claims (5)

An indoor heat exchanger as an evaporator that exchanges heat between the refrigerant and room air;
A hot water storage tank for storing hot water,
A water refrigerant heat exchanger as a condenser, comprising a refrigerant passage and a water passage, and performing heat exchange between the refrigerant in the refrigerant passage and water in the water passage;
A heat pump heat exchanger as an evaporator that performs heat exchange between the refrigerant and outside air;
A compressor,
The water passage of the water refrigerant heat exchanger and the hot water storage tank are annularly connected by hot water piping to form a hot water circulation circuit, the indoor heat exchanger, the refrigerant passage of the water refrigerant heat exchanger, the heat pump A heat exchanger and the compressor are connected by refrigerant piping to form a refrigerant circulation circuit, indoor air is cooled by the indoor heat exchanger, and water to the hot water storage tank is discharged by the water refrigerant heat exchanger. In a heat pump water heater with a cooling function capable of performing boiling and cooling operations to be heated,
The refrigerant pipe is
The discharge side of the compressor is connected to the inlet side of the refrigerant passage of the water refrigerant heat exchanger, and the outlet side of the refrigerant passage of the water refrigerant heat exchanger is connected to the inlet side of the indoor heat exchanger. Connected, further connected the outlet side of the indoor heat exchanger to the inlet side of the heat pump heat exchanger, and further connected the outlet side of the heat pump heat exchanger to the suction side of the compressor,
And,
Load detection means for detecting a cooling load in the indoor heat exchanger;
A heat pump water heater with a cooling function, characterized by comprising heat absorption control means for increasing the amount of heat absorption in the heat pump heat exchanger when the cooling load detected by the load detection means decreases. The refrigerant pipe is
A first pipe connecting the discharge side of the compressor and the inlet side of the refrigerant passage of the water refrigerant heat exchanger;
A second pipe connecting the outlet side of the refrigerant passage of the water refrigerant heat exchanger and the inlet side of the indoor heat exchanger;
A third pipe connecting the outlet side of the indoor heat exchanger and the inlet side of the heat pump heat exchanger;
A fourth pipe connecting the outlet side of the heat pump heat exchanger and the suction side of the compressor;
The heat pump water heater with a cooling function according to claim 1, wherein the second pipe is provided with a decompressor whose valve opening is variably controlled according to an operating state. A fan further for sending outside air to the heat pump heat exchanger;
The endothermic control means includes
3. The heat pump with a cooling function according to claim 1, wherein the heat pump is a rotation control unit that increases the number of rotations of the blower fan when the cooling load detected by the load detection unit decreases. Water heater. The rotation is controlled based on at least the room temperature, and further includes a cooling fan that blows out cool air from the indoor heat exchanger into the room,
The load detecting means includes
Rotation detection means for detecting the number of rotations of the cooling fan;
The endothermic control means includes
4. The heat absorption amount in the heat pump heat exchanger is increased in response to a decrease in the number of rotations of the cooling fan detected by the rotation detection unit. 5. A heat pump water heater with a cooling function described in 1. It further has detection means for detecting the room temperature,
The load detecting means includes
Calculating means for calculating a temperature difference between an indoor temperature detection value detected by the detection means and an indoor temperature setting value set by a user;
The endothermic control means includes
The cooling according to any one of claims 1 to 3, wherein the heat absorption amount in the heat pump heat exchanger is increased when the temperature difference calculated by the calculating means decreases. Heat pump water heater with function.

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