JP2018155453A - Water heating system - Google Patents

Abstract

A water heating system is miniaturized.
A heating / hot water supply system (20) includes an outdoor unit (23) and an indoor unit (25). The outdoor unit 23 includes a refrigerant circulation circuit and takes heat from the outside air. The indoor unit 25 includes a water circulation circuit, and heats the water flowing through the water circulation circuit by removing heat from the refrigerant flowing through the refrigerant circulation circuit. The indoor unit 25 includes a water storage tank 60 that stores heated water, and a heat storage member 61 that is disposed in the water storage tank 60 and exchanges heat with water.
[Selection] Figure 1

Description

  The present invention relates to a water heating system, and more particularly to a water heating system that generates hot water for hot water supply or heating.

  Conventionally, a water heating system for generating hot water for hot water supply or heating has been proposed. For example, in a heat pump hot water supply apparatus disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2013-174408), hot water heated by a heat pump is stored in a tank, and the hot water is used for hot water supply or heating.

  However, the hot water supply apparatus as described above generally requires a large tank, and securing the installation space for the tank is a problem.

  The subject of this invention is aiming at size reduction of a water heating system.

  The water heating system according to the first aspect of the present invention includes a heat pump device and a water circulation device. The heat pump device includes a refrigerant circulation circuit and takes heat from outside air. The water circulation device includes a water circulation circuit and heats water flowing through the water circulation circuit by removing heat from the refrigerant flowing through the refrigerant circulation circuit. The water circulation circuit includes a water storage tank that stores heated water, and a heat storage member that is disposed in the water storage tank and exchanges heat with water.

  Here, not only the heated water is stored in the water storage tank, but also a heat storage member is arranged in the water storage tank. For this reason, compared with the case where heat is stored only with water, even if the amount of stored water is reduced, it can be compensated by the heat storage function of the heat storage member, so the size of the water storage tank can be reduced. Thereby, size reduction of a water heating system is achieved.

  The water heating system which concerns on the 2nd viewpoint of this invention is a water heating system which concerns on a 1st viewpoint, Comprising: The control part is further provided. The control unit controls the heat pump device and the water circulation device to perform a heat storage operation for storing heat in the water in the heat storage member and the water storage tank.

  Here, in the heat storage operation, heat is taken from the outside air by the heat pump device, the water is heated using the heat, and the heat is stored in the water and the heat storage member in the water storage tank. Therefore, for example, high-temperature hot water supply or rapid heating can be performed using these water and the heat stored in the heat storage member.

  The water heating system according to the third aspect of the present invention is the water heating system according to the first aspect or the second aspect, and further includes a hot water supply device. The hot water supply apparatus includes a hot water supply unit and a water pipe. The hot water supply unit provides heated water according to the user's request. The water pipe guides water supplied from the water supply source to the hot water supply section. A part of the water pipe is arranged in a water storage tank. A part of the water pipe located in the water storage tank serves as a heat exchanger that takes heat away from the heat storage member and the water in the water storage tank.

  Here, a part of the water pipe extending to the hot water supply part serves as a heat exchanger in the water storage tank, so that water taken from the water supply source can be heated and provided to the user from the hot water supply part. And since not only the heat of the water in a water storage tank but the heat of a heat storage member can be used for the heating of the water which flows through a water piping, securing of the amount of high temperature hot water and hot water becomes easy.

  A water heating system according to a fourth aspect of the present invention is the water heating system according to any one of the first aspect to the third aspect, and further includes a heating device. The heating device is installed in a predetermined space in the building and warms the predetermined space with the heat of water flowing from the water storage tank. The water flowing from the water storage tank to the heating device is cooled by exchanging heat with air in a predetermined space, and returns to the water storage tank.

  Here, since the heat storage member is arranged in the water storage tank, the water temperature can be kept high even if the amount of water flowing from the water storage tank to the heating device is increased, or high temperature water is supplied from the water storage tank to the heating device. The advantage of being able to shed is born.

  The water heating system according to the fifth aspect of the present invention is the water heating system according to any one of the first to fourth aspects, and the heat storage member is a composite heat storage material. The composite heat storage material includes a main material and one or a plurality of sub-materials, and changes phase while maintaining the outer shape in the heat storage operation.

  Here, as the heat storage member, a composite heat storage material that changes phase while maintaining the outer shape in the heat storage operation is used. Since the heat storage density is improved by using the latent heat of the composite heat storage material, the size of the heat storage member is relatively smaller than the conventional one with respect to the heat storage capacity. Thereby, the magnitude | size of a water storage tank and by extension, the magnitude | size of a water heating system can be suppressed.

  A water heating system according to a sixth aspect of the present invention is the water heating system according to the fifth aspect, wherein the composite heat storage material has a phase change during heat storage that absorbs heat or heat dissipation that releases heat as a main material. Including material with. Moreover, a composite heat storage material contains the material for maintaining a shape as a submaterial, even if a main material changes phase.

  Here, the composite heat storage material includes a material (sub-material) for maintaining the shape even when the main material undergoes a phase change. Thereby, the external shape of the heat storage material at the time of phase change can be maintained.

  The water heating system which concerns on the 7th viewpoint of this invention is a water heating system which concerns on a 5th viewpoint or a 6th viewpoint, Comprising: A composite heat storage material contains the material for improving thermal conductivity as a submaterial.

  Here, for example, a composite heat storage material is generated by adding a material for improving thermal conductivity, such as graphite or carbon-based nanoparticles, to the main material. For this reason, the thermal conductivity of the heat storage member is improved, and the heat storage operation in the water heating system can be performed efficiently.

  In addition, as a main material, it is preferable to use a paraffin type material or erythritol, for example.

  Further, as a secondary material added to the main material in order to maintain the shape even when the phase of the main material changes, it is preferable to use at least one of high density polyethylene having a specific gravity of 0.94 or more, or ceramic.

  According to the present invention, the water heating system can be miniaturized.

The lineblock diagram of the heating and hot-water supply system which is a water heating system concerning a 1st embodiment of the present invention. The control block diagram of a heating and hot-water supply system. The conceptual diagram which shows arrangement | positioning of the thermal storage member in a water storage tank. The figure which shows the heating operation of a heating and hot-water supply system. The figure which shows the air_conditionaing | cooling operation of a heating / hot-water supply system. The figure which shows the hot-water supply driving | operation of a heating and hot-water supply system. The figure which shows the thermal storage driving | operation of a heating / hot-water supply system. The figure which shows the heat storage utilization hot water supply driving | operation of a heating and hot-water supply system. The conceptual diagram which shows arrangement | positioning of the thermal storage member in the water storage tank which concerns on the modification of 1st Embodiment. The block diagram of the heating and hot-water supply system which is a water heating system which concerns on 2nd Embodiment of this invention.

<First Embodiment>
FIG. 1 shows a heating / hot water supply system 20 that is a water heating system according to the first embodiment of the present invention.

(1) Configuration of Heating / Hot Water Supply System The heating / hot water system 20 includes an outdoor unit 23, an indoor unit 25, a heating device 26 such as a radiator or a fan coil unit, a hot water supply device 28 such as a faucet or shower, and an outdoor unit. 23 and a control unit 90 that controls each device of the indoor unit 25.

(1-1) Outdoor unit The outdoor unit 23 that functions as a heat pump device mainly includes a compressor 31, a four-way switching valve 32, an outdoor heat exchanger 33, an expansion valve 34, and a fan 39. Yes. The outdoor unit 23 has first and second ports 23 a and 23 b connected to the indoor unit 25, respectively.

  The compressor 31 has a variable capacity by inverter control. The compressor 31 sucks in the low-pressure gas refrigerant and discharges the gas refrigerant that has been compressed to a high pressure.

  The four-way switching valve 32 includes a first state in which the discharge pipe of the compressor 31 and the outdoor heat exchanger 33 communicate with each other and the suction pipe of the compressor 31 and the first port 23a communicate with each other, and the discharge pipe of the compressor 31. And a first port 23a, and a valve that switches between a second state in which the suction pipe of the compressor 31 and the outdoor heat exchanger 33 communicate with each other. In the cooling operation 92 described later, the four-way switching valve 32 is in the first state, and in the heating operation 91 and the like, the four-way switching valve 32 is in the second state.

  The outdoor heat exchanger 33 is a device that exchanges heat between the refrigerant flowing inside and the outdoor air flowing around by driving of the fan 39, and takes the cold air or the heat from the outdoor air and gives it to the refrigerant. In the cooling operation 92 described later, the outdoor heat exchanger 33 functions as a refrigerant condenser, and in the heating operation 91 and the like, the outdoor heat exchanger 33 functions as a refrigerant evaporator.

  The expansion valve 34 provided between the outdoor heat exchanger 33 and the second port 23b is a valve that functions as an expansion mechanism for decompressing the refrigerant, and the opening degree can be adjusted.

(1-2) Indoor Unit The indoor unit 25 that functions as a water circulation device mainly includes first to sixth water circulation pipes 51 to 56 and a refrigerant pipe 57. The indoor unit 25 includes first and second refrigerant pipe connection ports 25a and 25b that are connected to the first and second ports 23a and 23b of the outdoor unit 23, respectively, and a first and Second water pipe connection ports 25c and 25d and third and fourth water pipe connection ports 25e and 25f for connecting the hot water supply device 28 and the like are provided. Further, the indoor unit 25 includes a pump 71 for circulating water, an indoor heat exchanger 72 for exchanging heat between the refrigerant and water, a three-way valve 73 for switching the water circulation path, and first and second check. It has the valves 74 and 75 and the water storage tank 60 which stores the heated water.

(1-2-1) Pump The pump 71 is connected to the first water circulation pipe 51 in the water circulation path formed with the heating device 26 or the water circulation path formed with the water storage tank 60. To discharge.

(1-2-2) Indoor Heat Exchanger The indoor heat exchanger 72 is supplied from the outdoor unit 23 and flows through the refrigerant pipe 57, enters the first water circulation pipe 51, and enters the second water circulation pipe 52. Exchange heat with the flowing water.

(1-2-3) Water Storage Tank The water storage tank 60 is a container that stores high-temperature water that is a heat source for heating water supplied to the hot water supply device 28. A fifth water circulation pipe 55 is connected to the upper part of the water storage tank 60, and a sixth water circulation pipe 56 is connected to the lower part of the water storage tank 60. In addition, a hot water supply heat transfer pipe 63 is disposed and fixed in the water stored in the water storage tank 60. The inlet of the hot water supply heat transfer pipe 63 is connected to a water supply pipe 99a extending from a water supply source 99 such as a water supply via a fourth water pipe connection port 25f. The outlet of the hot water supply heat transfer pipe 63 is connected to the hot water supply device 28 via the third water pipe connection port 25e.

(1-2-4) Heat storage member Moreover, the water storage tank 60 has the some heat storage member 61 located in the water stored in the internal space. The heat storage member 61 is fixed in the water storage tank 60 and is disposed below the heat transfer pipe 63 for hot water supply.

  The heat storage member 61 is a composite heat storage material, and includes a main material and one or more sub-materials. This composite heat storage material undergoes a phase change while maintaining its outer shape in a heat storage operation 94 and a heat storage hot water supply operation 95 described later.

  Specifically, nanographite particles or nanocarbon particles for improving thermal conductivity are mixed as an additive to paraffin and erythritol that change phase, and high-density polyethylene (HDPE) or Ceramic particles are mixed to produce a composite heat storage material.

  For example, paraffin with a melting temperature of 60 ° C. is used as the phase change material, high-density polyethylene is used to maintain the shape of the paraffin during the phase change, and graphite and carbon particles are further increased in thermal conductivity. Only a few to 20% can be added to produce a solid composite heat storage material.

  The plurality of heat storage members 61 are formed in a columnar shape, and are arranged so as to extend long in the vertical direction, as shown in FIG. FIG. 3 is a conceptual diagram for showing the relative positions of the plurality of heat storage members 61 in the water storage tank 60. In FIG. 3, illustration of the bottom and top portions of the hot water supply heat transfer pipe 63 and the water storage tank 60 is omitted. The shape of the water storage tank 60 is also cylindrical, and the heat storage members 61 are densely arranged in the cylindrical internal space of the water storage tank 60 so that the gap between them becomes small.

(1-2-5) Three-way valve and check valve The three-way valve 73 includes a first state in which water circulates between the indoor heat exchanger 72 and the heating device 26, an indoor heat exchanger 72, a water storage tank 60, It is a valve which switches the 2nd state where water circulates between. In the first state, the water discharged from the pump 71 is the first water circulation pipe 51, the indoor heat exchanger 72, the second water circulation pipe 52, the three-way valve 73, the third water circulation pipe 53, the heating device 26, The water flows through the fourth water circulation pipe 54 and the first check valve 74 in order, and is sucked into the pump 71 again. In the second state, the water discharged from the pump 71 is the first water circulation pipe 51, the indoor heat exchanger 72, the second water circulation pipe 52, the three-way valve 73, the fifth water circulation pipe 55, the water storage tank 60, It flows through the sixth water circulation pipe 56 and the second check valve 75 in this order, and is sucked into the pump 71 again.

  The first check valve 74 is a check valve that allows the flow of water from the second water pipe connection port 25d connected to the heating device 26 to the pump 71 and does not allow the reverse flow. The second check valve 75 is a check valve that allows the flow of water from the water storage tank 60 to the pump 71 and does not allow the reverse flow.

(1-3) Heating device and hot water supply device The heating device 26 is a radiator, a fan coil unit, a floor heating unit, or the like that is provided in a building such as a house, and is heated by the heat of high-temperature water (hot water) flowing inside. Heat the building. Each heating device 26 is connected to the first and second water pipe connection ports 25c and 25d of the indoor unit 25 via the heating water communication pipes 26a and 26b.

  The hot water supply device 28 is a faucet or shower faucet that can supply hot water in a building, and is connected to a third water pipe connection port 25e of the indoor unit 25 via a hot water supply water connection pipe 28a. For example, when the faucet is opened, the water from the water supply source 99 causes the water from the water supply source 99 to be supplied to the water supply pipe 99a, the fourth water pipe connection port 25f, the hot water supply heat transfer pipe 63, the third water pipe connection port 25e, and the hot water supply. It flows out from the faucet through the water connection pipe 28a. This water exchanges heat with the hot water in the water storage tank 60 of the indoor unit 25 and the heat storage member 61 while passing through the hot water supply heat transfer pipe 63, and becomes hot water of about 40-50 ° C. In the hot water supply device 28, the hot water supply temperature is adjusted using a mixed faucet or the like.

(1-4) Control part The control part 90 is a controller which controls each apparatus and each valve | bulb of the outdoor unit 23 and the indoor unit 25, and performs various driving | operations. The control unit 90 mainly includes a CPU, and executes various processes by executing programs stored in a memory (not shown) including a RAM, a ROM, and a hard disk. As shown in FIG. 2, the control unit 90 is connected to the compressor 31, the four-way switching valve 32, the expansion valve 34, the fan 39, the pump 71, the three-way valve 73, and the like. In addition, a refrigerant temperature sensor and a water temperature sensor (not shown) are also connected to the control unit 90.

  As shown in FIG. 2, the control unit 90 performs a heating operation 91, a cooling operation 92, a hot water supply operation 93, a heat storage operation 94, a heat storage use hot water supply operation 95, and the like.

(2) Operation of Heating / Hot Water Supply System In the heating / hot water supply system 20, the following operations can be performed. In these operations, refrigerant and water flow as described below, and heating, cooling, hot water supply, and heat storage are performed.

(2-1) Heating Operation In the heating operation 91, as shown in FIG. 4, in the outdoor unit 23, the refrigerant circulates in the heating cycle, and the outdoor heat exchanger 33 removes the heat from the outdoor air. It flows to the indoor heat exchanger 72 of the unit 25. That is, in the heating operation 91, the control unit 90 puts the four-way switching valve 32 in the second state and throttles the opening of the expansion valve 34 to depressurize the refrigerant. Here, the refrigerant flows in the order of the compressor 31, the indoor heat exchanger 72, the expansion valve 34, and the outdoor heat exchanger 33, and returns to the compressor 31. The indoor heat exchanger 72 functions as a refrigerant condenser, and the outdoor heat exchanger 33 functions as a refrigerant evaporator. The high-temperature and high-pressure refrigerant discharged from the compressor 31 releases heat to the water circulating in the indoor unit 25 in the indoor heat exchanger 72.

  On the other hand, in the indoor unit 25, the three-way valve 73 is set to the first state, and the water discharged from the pump 71 is supplied to the first water circulation pipe 51, the indoor heat exchanger 72, the second water circulation pipe 52, the three-way valve 73, the first The control unit 90 controls each valve so that the three water circulation pipes 53, the heating device 26, the fourth water circulation pipe 54, and the first check valve 74 flow in order and are sucked into the pump 71 again. The water discharged from the pump 71 takes heat from the high-temperature refrigerant flowing through the refrigerant pipe 57 in the indoor heat exchanger 72 and becomes high temperature, and releases heat in the heating device 26. Thereby, heating by the heating device 26 is performed. The water radiated by the heating device 26 returns to the indoor unit 25 and is again discharged and circulated by the pump 71 toward the indoor heat exchanger 72.

(2-2) Cooling Operation The heating / hot water supply system 20 is basically a system that performs heating and hot water supply, but in this embodiment, a four-way switching valve 32 is provided in the outdoor unit 23 and the heating device 26 is provided. The system can also be cooled by flowing cold water.

  In the cooling operation 92, as shown in FIG. 5, the control unit 90 causes the refrigerant to flow through the compressor 31, the outdoor heat exchanger 33, the expansion valve 34, and the indoor heat exchanger 72 in this order and return to the compressor 31. Controls each valve. That is, the four-way switching valve 32 is set to the first state so that the refrigerant circulates in the cooling cycle, and the opening of the expansion valve 34 is reduced to depressurize the refrigerant. The outdoor heat exchanger 33 functions as a refrigerant condenser, and the indoor heat exchanger 72 functions as a refrigerant evaporator. The low-pressure two-phase refrigerant that leaves the outdoor heat exchanger 33 and is decompressed by the expansion valve 34 evaporates in the indoor heat exchanger 72 and takes heat from the water circulating in the indoor unit 25.

  On the other hand, in the indoor unit 25, the three-way valve 73 is set to the first state, and the water discharged from the pump 71 is supplied to the first water circulation pipe 51, the indoor heat exchanger 72, the second water circulation pipe 52, the three-way valve 73, the first The control unit 90 controls each valve so that the three water circulation pipes 53, the heating device 26, the fourth water circulation pipe 54, and the first check valve 74 flow in order and are sucked into the pump 71 again. The water discharged from the pump 71 is absorbed by the refrigerant flowing through the refrigerant pipe 57 in the indoor heat exchanger 72 to become a low temperature, and the heating device 26 absorbs the heat from the indoor air. Thereby, the room is cooled by the heating device 26. The water absorbed by the heating device 26 returns to the indoor unit 25 and is again discharged and circulated by the pump 71 toward the indoor heat exchanger 72.

(2-3) Hot-water supply operation In the hot-water supply operation 93, as shown in FIG. 6, in the outdoor unit 23, the refrigerant circulates in the heating cycle, and the outdoor heat exchanger 33 removes the heat from the outdoor air. It flows to the indoor heat exchanger 72 of the unit 25. That is, in the heating operation 91, the control unit 90 puts the four-way switching valve 32 in the second state and throttles the opening of the expansion valve 34 to depressurize the refrigerant. Here, the refrigerant flows in the order of the compressor 31, the indoor heat exchanger 72, the expansion valve 34, and the outdoor heat exchanger 33, and returns to the compressor 31. The indoor heat exchanger 72 functions as a refrigerant condenser, and the outdoor heat exchanger 33 functions as a refrigerant evaporator. The high-temperature and high-pressure refrigerant discharged from the compressor 31 releases heat to the water circulating in the indoor unit 25 in the indoor heat exchanger 72.

  On the other hand, in the indoor unit 25, the three-way valve 73 is set to the second state, and the water discharged from the pump 71 is supplied to the first water circulation pipe 51, the indoor heat exchanger 72, the second water circulation pipe 52, the three-way valve 73, the second The control unit 90 controls each valve so that it flows through the 5 water circulation pipe 55, the water storage tank 60, the sixth water circulation pipe 56, and the second check valve 75 in order and is sucked into the pump 71 again. The water discharged from the pump 71 takes heat from the high-temperature refrigerant flowing through the refrigerant pipe 57 in the indoor heat exchanger 72 and becomes high temperature, and flows into the upper portion of the water storage tank 60. Then, the relatively low temperature water below the water storage tank 60 is pushed out and returned to the pump 71.

  Then, the water flowing from the water supply pipe 99 a to the hot water supply device 28 through the hot water supply heat transfer pipe 63 in the water storage tank 60 exchanges heat with the high-temperature water in the water storage tank 60 and the heat storage member 61, and High temperature hot water is poured.

(2-4) Heat storage operation When there is no request for heating or hot water supply and the water temperature in the water storage tank 60 is low, the heat storage operation 94 is performed by the controller 90 in order to store the heat in the water in the water storage tank 60 and the heat storage member 61. Is executed. As shown in FIG. 7, in the heat storage operation 94, in the outdoor unit 23, the refrigerant circulates in the heating cycle, and the refrigerant that has taken the heat from the outdoor air in the outdoor heat exchanger 33 is used as the indoor heat exchanger of the indoor unit 25. To 72. Similar to the heating operation 91, the high-temperature and high-pressure refrigerant discharged from the compressor 31 releases heat to the water circulating in the indoor unit 25 in the indoor heat exchanger 72.

  On the other hand, in the indoor unit 25, similarly to the hot water supply operation 93, the three-way valve 73 is set to the second state, and the water discharged from the pump 71 is the first water circulation pipe 51, the indoor heat exchanger 72, and the second water circulation pipe. 52, the three-way valve 73, the fifth water circulation pipe 55, the water storage tank 60, the sixth water circulation pipe 56, and the second check valve 75 in this order, and the control unit 90 causes each valve to be sucked into the pump 71 again. Control. The water discharged from the pump 71 takes heat from the high-temperature refrigerant flowing through the refrigerant pipe 57 in the indoor heat exchanger 72 and becomes high temperature, and flows into the upper portion of the water storage tank 60. Then, the relatively low temperature water below the water storage tank 60 is pushed out and returned to the pump 71. In the water storage tank 60, heat is gradually stored in the heat storage member 61, and the proportion of high-temperature water in the water storage tank 60 increases.

(2-5) Hot water supply operation using heat storage If the water temperature in the water storage tank 60 is sufficiently high by the heat storage operation, it can be said that sufficient heat is also stored in the heat storage member 61. In this state, when there is a request for hot water supply, the compressor 31 of the outdoor unit 23 is not operated for a while, and the hot water supply operation using the water in the water storage tank 60 and the heat storage of the heat storage member 61 (heat storage use hot water supply operation). 95) is performed.

  As shown in FIG. 8, in the regenerative hot water supply operation 95, the control unit 90 operates the pump 71 of the indoor unit 25 without circulating the refrigerant of the outdoor unit 23. Similar to the hot water supply operation 93, the three-way valve 73 is set to the second state, and the water discharged from the pump 71 is the first water circulation pipe 51, the indoor heat exchanger 72, the second water circulation pipe 52, and the three-way valve 73. The fifth water circulation pipe 55, the water storage tank 60, the sixth water circulation pipe 56, and the second check valve 75 sequentially flow and are sucked into the pump 71 again.

  On the other hand, the water flowing from the water supply pipe 99 a to the hot water supply device 28 through the hot water supply heat transfer pipe 63 in the water storage tank 60 exchanges heat with the high temperature water in the water storage tank 60, and is heated toward the hot water supply device 28. Is done. The circulating water whose temperature has been reduced by exchanging heat with the water passing through the hot water transfer pipe 63 in the water storage tank 60 takes heat from the heat storage member 61 when it flows from the top to the bottom through the periphery of the heat storage member 61, and thus has a high temperature. Then, the water flows again into the upper part of the water storage tank 60 through the pump 71 and exchanges heat with the water passing through the heat transfer pipe 63 for hot water supply. And when the temperature of circulating water falls, it switches from the heat storage utilization hot water supply operation 95 shown in FIG. 8 to the hot water supply operation 93 shown in FIG. That is, when the temperature of the circulating water in the indoor unit 25 decreases, the control unit 90 operates the compressor 31 of the outdoor unit 23 to circulate the refrigerant in the outdoor unit 23 in the heating cycle.

(3) Features of the heating / hot water system (3-1)
The heating / hot water supply system 20 according to the present embodiment includes an outdoor unit 23 as a heat pump device and an indoor unit 25 as a water circulation device. The outdoor unit 23 is a unit including a refrigerant circulation circuit having a compressor 31, a four-way switching valve 32, an outdoor heat exchanger 33, and an expansion valve 34, and when performing a heat storage operation 94, the outdoor heat exchanger 33. Heat is taken from outside air (outdoor air). The outdoor unit 23 is a unit including a water circulation circuit having first to sixth water circulation pipes 51 to 56 and a pump 71, and in the indoor heat exchanger 72, heat is taken from the refrigerant flowing through the refrigerant circulation circuit, and the water circulation circuit Heat the water flowing through. The water storage tank 60 included in the water circulation circuit has a heat storage member 61 that exchanges heat with the water inside. Then, the control unit 90 executes a heat storage operation 94 that stores heat in the water in the heat storage member 61 and the water storage tank 60.

  Here, not only the heated water is stored in the water storage tank 60, but also the heat storage member 61 is arranged in the water storage tank 60. For this reason, since the heat storage function of the heat storage member 61 can compensate for the reduction in the amount of water to be stored, the size of the water storage tank 60 can be reduced as compared with the case where heat is stored using only water. Thereby, size reduction of the heating / hot-water supply system 20 is achieved.

(3-2)
The heating / hot water supply system 20 according to the present embodiment includes a hot water supply device including a water supply pipe 99a, a hot water supply heat transfer pipe 63, a hot water supply water communication pipe 28a, a hot water supply device 28, and the like. A hot water supply device 28 such as a shower or a faucet provides heated water according to a user's request. Of the water supply pipe 99 a that leads the water supplied from the water supply source 99 to the hot water supply device 28, the hot water supply heat transfer pipe 63, and the hot water supply water communication pipe 28 a, the hot water supply heat transfer pipe 63 is disposed in the water storage tank 60. . The hot water supply heat transfer pipe 63 serves as a heat exchanger that takes heat away from the water in the heat storage member 61 and the water storage tank 60.

  Here, since the heat transfer pipe 63 for hot water supply serves as a heat exchanger in the water storage tank 60, even if the compressor 31 of the outdoor unit 23 is stopped, the water taken from the water supply source 99 is heated. It can be provided to the user from the hot water supply device 28 (see the above-described heat storage hot water supply operation 95 shown in FIG. 8). And since not only the heat of the water in the water storage tank 60 but the heat of the heat storage member 61 can also be used for the heating of the water which flows through the hot water supply heat exchanger tube 63, it becomes easy to ensure a high-temperature hot water discharge and a hot water discharge amount. Yes.

(3-3)
In the heating / hot water supply system 20 according to the present embodiment, the heat storage member 61 stores heat by taking heat from the circulating water flowing through the water storage tank 60 in the water storage tank 60 in the heat storage operation 94. Further, the heat storage member 61 releases heat to the circulating water flowing through the water storage tank 60 in the heat storage hot water supply operation 95. As the heat storage member 61, a composite heat storage material that changes phase while maintaining the outer shape in the heat storage operation 94 or the heat storage hot water supply operation 95 is adopted. The composite heat storage material includes a main material and a plurality of sub-materials. Since the heat storage density is improved by using the latent heat of the composite heat storage material, the size of the heat storage member 61 with respect to the heat storage capacity is relatively smaller than that of water or hydrate slurry. Thereby, size reduction of the heating and hot water supply system 20 which performs the heat storage operation 94 is achieved.

(4) Modification In the first embodiment described above, the heat storage member 61 is formed into a cylindrical shape, and the plurality of heat storage members 61 are arranged in the water storage tank 60 so that the longitudinal direction thereof matches the direction in which the circulating water flows. However, a water storage tank 160 and a heat storage member 161 as shown in FIG. 9 may be employed instead.

  A large number of spherical heat storage members 161 are packed in the water storage tank 160 in a state where they are in contact with each other. Since each heat storage member 161 is spherical, the flow path of the circulating water formed in the water storage tank 160 becomes a naturally meandering flow path, and heat exchange between the circulating water and the heat storage member 161 is promoted.

  In addition, the arrow in FIG. 9 has shown the flow of the circulating water.

Second Embodiment
FIG. 10 shows a heating / hot water system 220 that is a water heating system according to the second embodiment of the present invention. The heating / hot water supply system 220 employs an indoor unit 225 instead of the indoor unit 25 while using the same outdoor unit 23 as the heating / hot water supply system 20 shown in FIG. 1, the heating device 26 and the hot water supply device 28. System.

  The indoor unit 225 is newly provided with a second three-way valve 279 in the fourth water circulation pipe 54 of the indoor unit 25 of the first embodiment, and the state of the second three-way valve 279 is switched, whereby the second three-way valve is switched from the heating device 26 to the second three-way valve. This is a unit that can select the third water circulation path through which the circulating water flows into the upper part of the water storage tank 60 through the valve 279 and the seventh water circulation pipe 254. The seventh water circulation pipe 254 is a pipe connecting the second three-way valve 279 and the fifth water circulation pipe 55.

  In this heating / hot water supply system 220, in addition to the heating operation 91, the cooling operation 92, the hot water supply operation 93, the heat storage operation 94 and the heat storage hot water supply operation 95 of the first embodiment described above, the refrigerant and circulating water indicated by the bold lines in FIG. It is possible to further perform heating and preliminary heat storage operation by flow.

  For example, while there is a request for heating, the control unit 90 preferentially stores water in the water storage tank 60 and heat storage member 61 at the same time as heating at a low temperature of 30 ° C. in the water storage tank 60. Sometimes heating / preliminary heat storage operation is performed.

(1) Heating / preliminary heat storage operation In the heating / preliminary heat storage operation, the control unit 90 causes the outdoor unit 23 to circulate the refrigerant in the heating cycle. The high-temperature and high-pressure refrigerant discharged from the compressor 31 releases heat to the water circulating in the indoor unit 25 in the indoor heat exchanger 72. On the other hand, in the indoor unit 225, the three-way valve 73 is set to the first state, and the second three-way valve 278 is circulated from the heating device 26 through the second three-way valve 279 and the seventh water circulation pipe 254 to the upper part of the water storage tank 60. The state that flows in. Then, the water discharged from the pump 71 becomes the first water circulation pipe 51, the indoor heat exchanger 72, the second water circulation pipe 52, the three-way valve 73, the third water circulation pipe 53, the heating device 26, and the second three-way valve. 279, the seventh water circulation pipe 254, the water storage tank 60, the sixth water circulation pipe 56, and the second check valve 75 are sequentially flowed and sucked into the pump 71 again. The water discharged from the pump 71 takes heat from the high-temperature refrigerant flowing through the refrigerant pipe 57 in the indoor heat exchanger 72 and becomes high temperature, and releases heat in the heating device 26. For example, the high-temperature water that has entered the heating device 26 at 60 ° C. reaches 40 to 50 ° C. and returns to the indoor unit 25. The water returned to the indoor unit 25 flows through the second three-way valve 279 and the seventh water circulation pipe 254 to the upper part of the water storage tank 60 to push out the water in the low temperature water storage tank 60 to the pump 71 and to store the heat storage member. Heat is released to 61. In other words, the heat storage member 61 having a low temperature of 30 ° C. or less exchanges heat with the circulating water of 40 to 50 ° C. flowing into the water storage tank 60, and takes heat from the circulating water to store heat.

(2) Rapid heating operation Moreover, the control part 90 will heat rather than the above-mentioned heating operation 91, if the heat storage operation 94 of the above-mentioned 1st Embodiment is performed and the water temperature in the water storage tank 60 is high enough. Rapid heating operation with high capacity can also be performed. When the refrigerant and water are circulated as shown in FIG. 10, the heating source of the circulating water becomes the heat storage member 61 in the indoor heat exchanger 72 and the water storage tank 60, and higher temperature circulating water can be provided to the heating device 26.

20 Heating / hot water system (water heating system)
23 Outdoor unit (heat pump device)
25 Indoor unit (water circulation device)
26 Heating equipment 28 Hot water supply equipment (hot water supply section)
28a Water supply piping for hot water supply (water piping)
60 Water storage tank 61 Heat storage member 63 Heat transfer pipe for hot water supply (water piping)
90 Control unit 94 Thermal storage operation 99 Water supply source 99a Water supply piping (water piping)
160 Water storage tank 161 Heat storage member 220 Heating / hot water supply system (water heating system)

JP 2013-174408 A

Claims (7)

A heat pump device (23) including a refrigerant circulation circuit and taking heat from outside air;
A water circulation device (25) that includes a water circulation circuit and heats water flowing through the water circulation circuit by removing heat from the refrigerant flowing through the refrigerant circulation circuit;
With
The water circulation circuit includes a water storage tank (60, 160) for storing heated water, and a heat storage member (61, 161) disposed in the water storage tank for exchanging heat with water.
Water heating system (20, 220). A controller (90) for controlling the heat pump device and the water circulation device to perform a heat storage operation (94) for storing heat in the water in the heat storage member and the water storage tank;
The water heating system according to claim 1, further comprising: A hot water supply unit (28) for supplying heated water according to a user's request, and water pipes (99a, 63, 28a) for guiding water supplied from a water supply source (99) to the hot water supply unit. Water heater,
Further comprising
A part (63) of the water pipe is disposed in the water storage tank and serves as a heat exchanger that takes heat from the heat storage member and water in the water storage tank,
The water heating system according to claim 1 or 2. A heating device (26) installed in a predetermined space in a building and heating the predetermined space by heat of water flowing from the water storage tank;
Further comprising
The water flowing from the water storage tank to the heating device is cooled by exchanging heat with the air in the predetermined space and returned to the water storage tank.
The water heating system (220) according to any one of claims 1 to 3. The heat storage member is a composite heat storage material that includes a main material and one or a plurality of sub-materials and changes phase while maintaining an outer shape in the heat storage operation.
The water heating system according to any one of claims 1 to 4. The composite heat storage material is
The main material includes a material that accompanies a phase change during heat storage for absorbing heat or heat dissipation for releasing heat,
As the secondary material, including a material for maintaining the shape even if the main material phase changes,
The water heating system according to claim 5. The composite heat storage material includes a material for improving thermal conductivity as the secondary material.
The water heating system according to claim 5 or 6.

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