JP2008185273A - Hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply system advantageous in reduction of a hot water storage space, and improvement of energy efficiency. <P>SOLUTION: The hot water supply system has a heat pump 20 carrying a first medium, a heat storage unit 50 thermally connected to the heat pump 20 and storing heat from the heat pump 20, and a supply unit 30 carrying a second medium. The heat pump 20 has a compressing part 22 compressing the first medium in multiple stages. In the supply unit 30, the second medium is heated by heat from at least one of the heat storage unit 50 or the heat pump 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water supply system using a heat pump.

Since a hot water supply system equipped with a heat pump (heat pump circuit) uses the heat of the atmosphere, the energy use efficiency during water heating is relatively high compared to other general hot water heaters such as electric water heaters. Known (see, for example, Patent Documents 1 and 2).
JP 2004-28479 A JP 2005-16759 A

  Conventionally, heat pump hot water supply systems have a problem that the capacity of a hot water storage space (tank) is relatively large. In order to further spread the heat pump hot water supply system to general households, it is desired to reduce the hot water storage space. In addition, further improvement in energy efficiency is desired.

  According to an aspect of the present invention, the heat pump is a heat pump through which the first medium flows, the heat pump having a compression section that compresses the first medium in multiple stages, and the heat pump that is thermally connected to store heat from the heat pump. There is provided a hot water supply system including a heat storage unit and a supply unit through which a second medium flows, and the supply unit in which the second medium is heated by heat from at least one of the heat storage unit and the heat pump.

  According to this hot water supply system, since the heat storage unit for water heating is provided separately from the heat pump circuit, the capacity of the hot water storage tank can be reduced or the entire hot water storage tank can be deleted as compared with the conventional hot water supply system.

  In this hot water supply system, the heat pump may further include a first heat radiating portion where the heat storage material is latently heated and a second heat radiating portion where the second medium is sensible heat heated.

  In this case, the heat pump includes a bypass path in which a part of the first medium from the first heat radiating part bypasses the second heat radiating part, and heat from the first medium in the bypass path is the compressing part. And a regenerator that is transmitted to the first medium upstream of the first medium.

  The supply unit may include a tank that stores the second medium heated by the second heat radiating unit.

  In this hot water supply system, it is a first mode in which the heat pump operates, an operation of storing heat from the first heat radiating unit in the heat storage unit, and the second medium heated by the second heat radiating unit to the tank. A first mode having a storing operation; a second mode in which the second medium heated by the second heat radiating unit is supplied from the tank; and the second medium heated by heat from the heat storage unit. A third mode to be supplied.

The hot water supply system may further include a control device that controls the operating state of the heat pump according to a time zone.
In the hot water supply system, the heat storage unit may include a latent heat storage material.

  In this case, the latent heat storage material can include a plurality of materials having different melting points.

  The heat storage unit further includes a first heat storage unit from which the second medium having the first temperature is supplied, and a second heat storage unit from which the second medium having the second temperature is supplied. Can have.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the first embodiment. In FIG. 1, the hot water supply system 10 includes a heat pump (heat pump circuit) 20, a supply unit 30, a heat storage unit 50, and a control device 70. The control device 70 comprehensively controls the entire system. The configuration of the hot water supply system 10 can be variously changed according to design requirements.

  The heat pump 20 is a circuit that transfers heat between a plurality of objects by using a change in the state of the refrigerant by a cycle including evaporation, compression, condensation, and expansion, and has an advantage of relatively high energy efficiency. Have In the present embodiment, the heat pump 20 pumps heat from the atmosphere and heats water using it as a heat source.

  In the present embodiment, the heat pump 20 includes a heat absorption part 21, a compression part 22, a heat radiation part 23, and an expansion part 24, which are sequentially connected via a pipe. In the heat absorption part 21, the working medium flowing in the main path 25 absorbs heat from a heat source (atmosphere) outside the cycle. In addition, the heat absorption part 21 can also be set as the structure which absorbs the heat | fever of heat sources (for example, cold supply apparatus) other than air | atmosphere.

  The compression unit 22 compresses the working medium using a compressor or the like. In the present embodiment, the compression unit 22 has a structure for compressing the working medium in multiple stages. The compression unit 22 in FIG. 1 has a four-stage compression structure including a first compression unit 22A, a second compression unit 22B, a third compression unit 22C, and a fourth compression unit 22D. The number of stages of compression is set according to the specification of the hot water supply system 10 and is 2, 3, 4, 5, 6, 7, 8, 9, or 10 or more. Among the various compressors such as an axial flow compressor, a centrifugal compressor, a reciprocating compressor, and a rotary compressor, a compressor suitable for compressing a working medium is applied. Power is supplied to the compressor. The compression unit 22 may have a multiaxial compression structure in which the rotation speeds corresponding to the compression units 22A, 22B, 22C, and 22D are individually controlled. Alternatively, the compression unit 22 can have a coaxial compression structure. In the present embodiment, the compression units 22A and 22B are configured coaxially, and the compression units 22C and 22D are configured coaxially. Power is supplied to each of the two shafts. The compression ratios (pressure ratios) of the compression units 22A, 22B, 22C, and 22D are set according to the specifications of the hot water supply system 10.

  The heat radiating unit 23 has a pipe through which the working medium compressed by the compressing unit 22 flows, and gives heat of the working medium flowing in the main path 25 to an object outside the cycle. In the present embodiment, the heat dissipating part 23 has five heat dissipating parts 23A to 23E arranged in series along the flow direction of the working medium. The number of heat radiating units is set according to the specifications of the hot water supply system 10 and is 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11 or more. The first heat radiating portion 23A is disposed between the compression portions 22A and 22B, the second heat radiating portion 23B is disposed between the compression portions 22B and 22C, and the third heat radiating portion 23C includes the compression portions 22C and 22D. The fourth heat dissipating part 23D is disposed downstream of the compression part 22D, and the fifth heat dissipating part 23E is disposed downstream of the fourth heat dissipating part 23D. The first to fourth heat radiating portions 23 </ b> A to 23 </ b> D are thermally connected to the heat storage unit 50. The fifth heat radiating portion 23E is thermally connected to a part of the supply unit 30.

  The expansion unit 24 expands the working medium using a pressure reducing valve, a turbine, or the like. When a turbine is used, power can be taken out from the expansion unit 24, and the power may be supplied to the compression unit 22, for example. As a working medium used for the heat pump 20, various known heat mediums such as a chlorofluorocarbon medium (such as HFC 245fa), ammonia, water, carbon dioxide, and air are used according to the specifications and heat balance of the hot water supply system 10. It is done.

  In the present embodiment, the heat pump 20 further includes a bypass path 27 and a regenerator 28. The inlet end of the bypass path 27 is fluidly connected to a pipe between the fourth heat radiating part 23D and the fifth heat radiating part 23E in the main path 25 of the heat pump 20. An outlet end of the bypass path 27 is fluidly connected to a pipe between the fifth heat radiating part 23 </ b> E and the expansion part 24 in the main path 25. A flow rate control valve for controlling the bypass flow rate of the working medium can be provided at the inlet of the bypass path 27. In the bypass path 27, a part of the working medium from the fourth heat radiating unit 23 </ b> D bypasses the fifth heat radiating part 23 </ b> E and merges with the working medium from the fifth heat radiating part 23 </ b> E before the expansion unit 24. The remaining working medium from the fourth heat radiating section 23D flows through the fifth heat radiating section 23E, and the working medium and water in the supply unit 30 exchange heat in the first heat exchanger 61.

  The regenerator 28 has a configuration in which a part of the pipe of the bypass path 27 and a part of the pipe of the main path 25 of the heat pump 20 (a pipe between the heat absorption part 21 and the compression part 22) are thermally connected. Have. For example, both pipes are arranged in contact with or adjacent to each other. In the heat pump 20, the working medium from the fourth heat radiating unit 23 </ b> D is hotter than the working medium from the heat absorbing unit 21. In the regenerator 28, the working medium from the fourth heat radiating part 23 </ b> D flowing through the bypass path 27 and the working medium from the heat absorbing part 21 flowing through the main path 25 of the heat pump 20 exchange heat. By this heat exchange, the temperature of the working medium in the bypass path 27 is lowered, and the temperature of the working medium in the main path 25 is raised. The regenerator 28 can have a countercurrent heat exchange system in which a low-temperature fluid (a working medium in the main passage 25) and a high-temperature fluid (a working medium in the bypass passage 27) face each other. Alternatively, the regenerator 28 may have a parallel flow type heat exchange system in which a high-temperature fluid and a low-temperature fluid flow in parallel.

  The supply unit 30 includes a water supply source 15, a first path 32, a second path 34, a hot water storage tank 36, and a discharge pipe 38. The supply unit 30 further includes a pump and a valve as necessary. In the present embodiment, water from the supply source 15 is sent to the first path 32 and / or the second path 34 via the valve 41. Under the control of the control device 70, the flow rate of water flowing through the first path 32 and the flow rate of water flowing through the second path 34 are controlled via the valve 41 and / or other flow rate control means.

  The first path 32 includes a first heating pipe 42 that is thermally connected to the fifth heat radiating portion 23E of the heat pump 20 and through which water from the supply source 15 flows. The first heat exchanger 61 is configured by the first heating pipe 42 and the fifth heat radiating portion 23E. The first heat exchanger 61 may have a countercurrent heat exchange system in which a low-temperature fluid (water in the first heating pipe 42) and a high-temperature fluid (working fluid in the heat pump 20) flow opposite to each other. it can. Alternatively, the first heat exchanger 61 may have a parallel flow type heat exchange method in which a high-temperature fluid and a low-temperature fluid flow in parallel. In the present embodiment, various known ones can be adopted as the heat exchange structure of the first heat exchanger 61. The first heating pipe 42 and the pipe of the fifth heat radiating portion 23E are arranged in contact with or adjacent to each other. For example, the pipe of the fifth heat radiating portion 23E can be disposed on the outer peripheral surface or inside of the pipe of the first heating pipe 42. Due to the heat transferred from the fifth heat radiating portion 23E of the heat pump 20, the temperature of the water in the first heating pipe 42 rises.

  The second path 34 includes a second heating pipe 44 that is thermally connected to the heat storage unit 50 and through which water from the supply source 15 flows. The water in the second heating pipe 44 rises in temperature due to the heat transferred from the heat storage unit 50.

  The first path 32 and the second path 34 are fluidly connected to the hot water storage tank 36. Hot water from the first heating pipe 42 of the first path 32 is sent to the tank 36. Hot water from the second heating pipe 44 of the second path 34 is also sent to the tank 36. A level sensor and / or a gas-liquid separator that measures the liquid level may be disposed in the tank 36. Hot water from the tank 36 is sent to the water distribution unit 95 via the discharge pipe 38.

  The heat storage unit 50 includes a heat storage material 52 that stores heat transmitted from the first to fourth heat radiation units 23 </ b> A to 23 </ b> D of the heat pump 20. The heat of the heat storage material 52 is transmitted to the second heating pipe 44 of the supply unit 30. The material characteristics of the heat storage material 52 are determined according to the specifications of the hot water supply system 10. In the present embodiment, the heat storage material 52 includes a latent heat storage material (PCM: Phase Change Material) that stores and releases heat with a liquid-solid phase change. That is, the heat storage material 52 stores heat when melting and dissipates heat when solidified. In the present embodiment, the melting point of the latent heat storage material is preferably about the same as the outlet temperature of the hot water from the supply unit 30 in terms of thermal efficiency. Melting | fusing point of a latent heat storage material is set according to the specification of the hot water supply system 10, for example, 20-30 degreeC, 30-40 degreeC, 40-50 degreeC, 50-60 degreeC, 60-70 degreeC, 70-80 degreeC, It is 80-90 degreeC, 90-100 degreeC, or 100 degreeC or more. Examples of the latent heat storage material include materials mainly composed of hydrocarbons such as erythritol and alkanes, wax systems (paraffin wax, microcrystalline wax, etc.), sodium acetate, sodium acetate trihydrate, or inorganic hydrate salts. It is done. Examples include the RUBITHERM RT series (registered trademark) manufactured by RUBITHRM, the PULSE ICE E series (registered trademark) manufactured by ENVIRONMENTAL PROCESS SYSTEMS, and the STL series (registered trademark) manufactured by Mitsubishi Chemical Engineering. The latent heat storage material has a small volume change accompanying a phase change (that is, a high stored energy density), and is advantageous for downsizing the apparatus. As the heat storage material 52, other substances such as a sensible heat storage material, a chemical reaction heat storage material, and a heat storage material using a supercritical fluid may be used.

  2A and 2B are cross-sectional views showing an example of the structure of the heat storage unit 50. In FIG. 2A, the heat storage unit 50 has a structure in which a heat storage material 52, the piping of the heat radiating portions 23 </ b> A to 23 </ b> D of the heat pump 20, and the second heating piping 44 of the supply unit 30 are arranged in a housing 54. The heat storage material 52 covers the piping of the heat dissipation portions 23A to 23D and the second heating piping 44 in the internal space of the housing 54 including the gap between the piping of the heat dissipation portions 23A to 23D and the second heating piping 44. Have been placed. The heat storage material 52 is in direct contact with the outer surfaces of the heat radiating portions 23 </ b> A to 23 </ b> D and the second heating pipe 44.

  2B, the heat storage unit 50 has a structure in which the heat storage material 52 and the second heating pipe 44 of the supply unit 30 are arranged inside the pipes of the heat radiation units 23A to 23D of the heat pump 20. The piping of the heat radiating portions 23A to 23D has a flow path having an annular cross section. The heat storage material 52 is disposed in a space between the heat radiation portions 23 </ b> A to 23 </ b> D and the second heating pipe 44. Moreover, as shown to FIG. 2C, the thermal storage unit 50 has the thermal storage material 52 and the several 2nd heating piping 44 of the supply unit 30 arrange | positioned inside the piping of the thermal radiation part 23A-23D of the heat pump 20. As shown in FIG. It can also have a structure. In another embodiment, the heat storage unit 50 has a structure in which the heat storage material 52 and the pipes of the heat radiating portions 23A to 23D are arranged inside the second heating pipe 44 having a channel having an annular cross section. Also good.

  In addition, the shape, arrangement | sequence, material, etc. of each piping can be set arbitrarily, and various forms are applicable about the heat storage unit 50. FIG. A heat insulating material is disposed in the heat storage unit 50 as necessary. Each pipe is provided with fins as necessary.

  Returning to FIG. 1, the control device 70 performs overall control of the hot water supply system 10 by controlling each device in the heat pump 20 and various piping devices including a pump and a valve, and performs calculation and control. In addition to the calculation unit, it includes a storage unit, an input / output unit, and the like. Measuring instruments such as a temperature sensor and a flow rate sensor (not shown) are appropriately disposed in each pipe of the tank 36 and the supply unit 30. The control device 70 performs the above control based on the measurement results of these measuring instruments, for example.

  Next, the basic operation of the hot water supply system 10 will be described. Various operation methods of the hot water supply system 10 using the heat storage unit 50 will be described later.

  In the hot water supply system 10, when the heat pump 20 is operated, water flowing through the first path 32 is heated by the first heat exchanger 61, and the hot water is stored in the tank 36. Furthermore, the heat from the heat pump 20 is stored in the heat storage unit 50 (heat storage material 52). Further, the hot water stored in the tank 36 is sent to the water distribution unit 95 through the discharge pipe 38 in accordance with the hot water demand. At this time, the water flowing through the second path 34 is heated by the heat from the heat storage unit 50, and the hot water is sent to the tank 36. Hot water from the water distribution unit 95 is supplied to various facilities such as a bath, a kitchen, and a washroom. The hot water may be supplied to a manufacturing plant, a cooking facility, an air conditioning facility, a power plant, and the like.

  In this embodiment, since at least a part of the function of the conventional hot water storage tank is supplemented by the use of the heat storage unit 50 having the latent heat storage material 52 having a high stored energy density, the required capacity of the tank 36 can be reduced. As a result, the entire apparatus can be made compact.

  In the present embodiment, since the heat pump 20 includes the multistage compression unit 22, there is little loss in heating the latent heat storage material 52. Furthermore, heat utilization efficiency is optimized by the heat pump 20 having the regenerator 28. As a result, this embodiment is advantageous in improving COP (coefficient of performance).

  3 and 4 are diagrams schematically showing an example of temperature changes of the working medium of the heat pump and the latent heat storage material (PCM) accompanying heat exchange. FIG. 3 corresponds to the hot water supply system 10 of FIG. FIG. 4 corresponds to a form in which a latent heat storage material is applied to a conventional hot water supply system.

  As shown in FIGS. 3 and 4, when heat is applied, the latent heat storage material changes from a solid to a liquid while maintaining a substantially constant temperature in the vicinity of the melting point. As shown in FIG. 4, in the form in which the conventional hot water supply system and the latent heat storage material are simply combined, the temperature tends to approach or reverse between the latent heat storage material and the working medium. This is disadvantageous in terms of heat exchange efficiency.

  On the other hand, in this embodiment, as shown in FIG. 1, the heat pump 20 includes a multistage compression unit 22. The heat storage unit 50 takes heat from the first heat radiating part 23A, the second heat radiating part 23B, and the third heat radiating part 23C, which are between the stages of the compression part 22, respectively. As a result, as shown in part (a) of FIG. 3, the temperature of the working medium in the compression process repeatedly rises and falls within a certain range. Moreover, as shown in FIG. 1, the working medium that has come out of the compression unit 22 flows through the fourth heat dissipation unit 23D. In the fourth heat radiating portion 23D, the working medium changes phase from vapor to liquid in the vicinity of the boiling point. As a result, as shown in part (b) of FIG. 3, the temperature of the working medium in the condensation process is kept constant.

  Thus, in this embodiment, since the compression part 22 of the heat pump 20 is a multistage type, in addition to a condensation process, the temperature of the working medium in a compression process is maintained in a fixed range. Thereby, the temperature profile can be preferably fitted between the latent heat storage material and the working medium. This is advantageous in terms of heat exchange efficiency. Further, it is advantageous in terms of compression efficiency and reduction of compressor power. The number of repetitions of the temperature rise and fall of the working medium (the number of reheating stages) is 2, 3, 4, 5, 6, 7, 8, 9, or 10 or more. It is advantageous for improving energy efficiency that the number of stages of reheating is large within the range of restrictions on the apparatus configuration.

  In the present embodiment, a part of the working medium bypasses the first heat exchanger 61 via the bypass path 27, so that the flow rate of the working medium entering the first heat exchanger 61 is optimized. This is advantageous in effectively using the retained heat of the working medium. The amount of bypass of the working medium is determined according to each physical property value (such as specific heat) of water and the working medium.

  The working medium flowing through the bypass path 27 exchanges heat with the working medium from the heat absorbing portion 21 flowing through the main path 25 of the heat pump 20 in the regenerator 28. By this heat exchange, the temperature of the working medium in the bypass path 27 is lowered, and the temperature of the working medium in the main path 25 of the heat pump 20 is raised. Due to the increase in the input temperature of the working medium to the compression unit 22, the power of the compression unit 22 is reduced.

  Further, in the present embodiment, the working medium in the bypass path 27 whose temperature has dropped in the regenerator 28 is the first heat exchanger 61 (the fifth heat radiating section 23E) that flows through the main path 25 of the heat pump 20 before the expansion section 24. ) From the working medium. Due to the effect of the flow rate optimization described above, the output temperature of the working medium from the first heat exchanger 61 is also sufficiently low. Therefore, a working medium having a relatively low temperature is introduced into the expansion portion 24. The reduction of the input temperature of the working medium to the expansion part 24 is advantageous for optimizing the liquid gas ratio of the working medium. As a result, the heat absorption unit 21 effectively absorbs heat from a heat source (atmosphere) outside the cycle.

  As described above, in the present embodiment, the working medium after being used for heating the heat storage unit 50 is used for warming water and regenerating the working medium, thereby effectively using heat.

  FIG. 5 is a diagram illustrating an example of a heat storage mode of the hot water supply system 10. 6 and 7 are diagrams showing examples of the hot water supply mode in which at least one of the tank 36 and the heat storage unit 50 is used as a heat source.

  As shown in FIG. 5, in the heat storage mode, the heat pump 20 of the hot water supply system 10 is operated mainly using nighttime power (midnight power). The operation of the heat pump 20 is, for example, a time zone in which the power rate is set low. The energy cost can be reduced by using the power in such a time zone. Heat from the first to fourth heat radiation portions 23 </ b> A to 23 </ b> D of the heat pump 20 is stored in the heat storage material 52. That is, the heat storage material 52 is heated by the heat transmitted from the first to fourth heat radiation portions 23A to 23D, and the heat storage material 52 changes from the solid phase to the liquid phase. The melting point of the latent heat storage material is, for example, 50 to 65 ° C. The control device 70 comprehensively controls the system. In the heat storage unit 50, the latent heat of fusion of the heat storage material 52 is stored with the liquefaction of the heat storage material 52. At this time, when there is no demand for hot water, water does not have to be introduced into the second path 34 of the supply unit 30.

  In parallel with the heat storage of the heat storage unit 50, hot water is stored in the tank 36 using the first heat exchanger 61. That is, water is introduced from the supply source 15 to the first path 32 in the operating state of the heat pump 20. The water flowing through the first heating pipe 42 of the first path 32 is heated by the heat transferred from the fifth heat radiating portion 23E, and the hot water is stored in the tank 36. The temperature of water from the supply source 15 is, for example, about 20 ° C., and the temperature of hot water in the tank 36 is, for example, about 50-55 ° C.

  When a predetermined time elapses, a predetermined amount of hot water is stored in the tank 36, and a predetermined amount of heat is stored in the heat storage material 52. For example, the end of the heat storage mode is determined based on the time, the processing time, and / or the amount of water stored in the tank 36. You may repeat at least one part of heat storage mode as needed. For example, at night or other than at night, the heat storage unit 50 can store heat appropriately according to the decrease in the amount of stored heat. In parallel with this, the tank 36 stores hot water according to the decrease in the amount of stored hot water. Can be stored.

  FIG. 6 shows a hot water supply mode using the first heat exchanger 61. As shown in FIG. 6, in the heat storage mode, hot water using the first heat exchanger 61 as a heat source is stored in the tank 36. Hot water from the tank 36 is introduced into the water distribution unit 95 by control of a valve, a pump, and the like. The warm water is supplied from the water distribution unit 95 to facilities such as a bath, a kitchen, and a washroom. In this mode, the heat pump 20 is normally not operating. This mode is preferably used mainly at the start of hot water supply or when a small amount of hot water is supplied. In this mode, the time required for hot water supply from the instruction is relatively short, and hot water can be continuously supplied within the range of the hot water storage capacity of the tank 36.

  FIG. 7 shows a hot water supply mode using the heat storage unit 50. In the hot water supply mode of FIG. 6, water is introduced from the supply source 15 to the second path 34 by control of a valve, a pump, or the like. The introduction of water into the second path 34 may be started when hot water supply from the tank 36 is started, or may be started when the amount of hot water stored in the tank 36 becomes a certain amount or less. The water flowing through the second heating pipe 44 of the second path 34 is heated by the heat transferred from the heat storage material 52 of the heat storage unit 50, and the hot water is sent to the tank 36. Along with this heat transfer, a part of the heat storage material 52 changes from a liquid to a solid. The temperature of the hot water is, for example, about 50 to 55 ° C. The hot water is supplied to facilities such as a bath, a kitchen, and a washroom through the water distribution unit 95. In this mode, the heat pump 20 is normally not operating. This mode has a hot water supply capacity (hot water storage amount) corresponding to the heat storage capacity of the heat storage unit 50. In this mode, it is possible to perform hot water supply in a certain range continuously and stably over a long period of time.

  Thus, according to this embodiment, the heat pump 20 is operated at night when the electricity rate is low, and hot water is supplied according to demand. In the heat storage mode, heat is stored at two locations, the heat storage material 52 and the tank 36. The hot water is stored in the tank 36, which is advantageous for shortening the rising time of the hot water supply. The capacity | capacitance (hot water storage space) of the tank 36 should just be a magnitude | size corresponding to stand-up time (time until hot water supply using the thermal storage material 52 becomes possible), for example, and can be reduced compared with the past.

  In the hot water supply mode using the heat storage material 52, the heat source for water heating is only the heat storage material 52, and the water is heated to a temperature approximately equal to the melting point of the heat storage material 52. As described above, the temperature of the water in the supply source 15 is, for example, about 20 ° C., and the melting point of the heat storage material 52 is, for example, 50-65 ° C. A small temperature difference between the two objects subjected to heat exchange is advantageous for improving COP. This can be achieved by effectively using the latent heat storage material 52 having a high heat capacity (accumulated energy density) as a heating source.

  The low temperature level of the entire system is advantageous for reducing the apparatus cost, heat loss, and COP. The outlet temperature of each compression part 22A-22D in the compression part 22 of the heat pump 20 is 55-75 degreeC, for example. In the present embodiment, by effectively using the latent heat storage material 52, it is possible to bring the heating temperature of the hot water close to the actual use temperature while the hot water storage space is small.

  In another embodiment, a heat storage material can be disposed in the first heat exchanger 61. In this case, in the heat storage mode, heat is stored in the heat storage material of the first heat exchanger 61 instead of or in addition to the hot water storage in the tank 36. The tank 36 can be deleted. It is also possible to arrange the heat storage material in other places such as the heat absorption part 21 and / or the regenerator 28.

  The heat storage by the latent heat storage material 52 is advantageous for suppressing the initial cost as compared with the heat storage using the battery, and the heat storage efficiency equal to or higher than that can be expected. It is also possible to use a battery as a power complement. For example, the energy stored in the battery can be used for heating water at the start of hot water supply.

  FIG. 8 is a schematic diagram showing the second embodiment. In the following description, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  In the hot water supply system 10 </ b> A of FIG. 8, the first to fourth heat radiation units 23 </ b> A to 23 </ b> D of the heat pump 20 and the second heating pipe 44 of the supply unit 30 are thermally connected. A second heat exchanger 62 is configured including the second heating pipe 44 and the first heat radiating portion 23A. Similarly, the 3rd heat exchanger 63 is comprised including the 2nd heating piping 44 and the 2nd thermal radiation part 23B. A fourth heat exchanger 64 is configured including the second heating pipe 44 and the third heat radiating portion 23C, and a fifth heat exchanger 65 is configured including the second heating pipe 44 and the fourth heat radiating portion 23D. . The second to fifth heat exchangers 62 to 65 employ a counter-current heat exchange method in which a low-temperature fluid (water in the supply unit 30) and a high-temperature fluid (working fluid in the heat pump 20) flow opposite to each other. Can have. Alternatively, the second to fifth heat exchangers 62 to 65 may have a parallel flow type heat exchange system in which a high-temperature fluid and a low-temperature fluid flow in parallel. As the heat exchange structure of the second to fifth heat exchangers 62 to 65, various known ones can be adopted. In this embodiment, the heat storage unit 50 is provided with respect to the 2nd-5th heat exchangers 62-65. The heat storage unit 50 includes a heat storage material 52 that stores heat transmitted from the heat pump 20. The heat of the heat storage material 52 is transmitted to the second heating pipe 44.

  9A to 9C are cross-sectional views illustrating structural examples of the heat storage unit 50 corresponding to the second heat exchanger 62. In FIG. 9A, the second heat exchanger 62 has a structure in which the piping of the heat radiating portion 23 </ b> A of the heat pump 20 and the second heating piping 44 are in direct contact within the housing 54. Further, a heat storage material 52 is arranged in the housing 54 so as to cover the piping of the heat radiating portion 23 </ b> A and the second heating piping 44. The second heating pipe 44 is directly thermally connected to the heat radiating portion 23A.

  In FIG. 9B, the second heat exchanger 62 has a structure in which the piping of the heat radiating portion 23A of the heat pump 20 is disposed inside the second heating piping 44 having an annular cross-section flow path. Moreover, the heat storage material 52 is arrange | positioned in the clearance gap between the 2nd heating piping 44 and the piping of the thermal radiation part 23A. The second heating pipe 44 is thermally connected to the heat radiating part 23 </ b> A via the heat storage material 52. A housing 54 surrounding the second heating pipe 44 is provided, and the heat storage material 52 can also be arranged in the gap between the housing 54 and the second heating pipe 44. In another embodiment, in the second heat exchanger 62, the second heating pipe 44 may be disposed inside the pipe of the heat dissipating part 23A having a channel having an annular cross section. In order to promote heat transfer from the heat radiating portion 23 </ b> A to the second heating pipe 44, the heat storage material 52 may include a heat conductive material.

  9C, the second heat exchanger 62 has a structure in which a plurality of (two in this example) pipes of the heat dissipating part 23A are arranged inside the second heating pipe 44 having a channel having an annular cross section. Each pipe of the heat radiating portion 23 </ b> A is in direct contact with the second heating pipe 44. A heat storage material 52 is disposed in the space inside the second heating pipe 44. The second heating pipe 44 is directly thermally connected to the heat radiating part 23 </ b> A or is thermally connected to the heat radiating part 23 </ b> A via the heat storage material 52. A housing 54 surrounding the second heating pipe 44 is provided, and the heat storage material 52 can also be arranged in the gap between the housing 54 and the second heating pipe 44.

  In addition, the shape, arrangement | sequence, material, etc. of each piping can be set arbitrarily, and various forms are applicable about the 2nd heat exchanger 62 in which the heat storage unit 50 was provided. A heat insulating material is disposed in the second heat exchanger 62 as necessary. Each pipe is provided with fins as necessary. The other heat exchangers 63, 64 and 65 can be configured in the same manner as the second heat exchanger 62.

  Also in this embodiment, as shown in FIG. 8, when the heat pump 20 is operated, the water flowing through the first path 32 is heated by the first heat exchanger 61, and the hot water is stored in the tank 36. Furthermore, the heat from the heat pump 20 is stored in the heat storage unit 50 (heat storage material 52). Further, the hot water stored in the tank 36 is sent to the water distribution unit 95 through the discharge pipe 38 in accordance with the hot water demand. At this time, the water flowing through the second path 34 is heated by the heat from the heat storage unit 50, and the hot water is sent to the tank 36. Hot water from the water distribution unit 95 is supplied to various facilities such as a bath, a kitchen, and a washroom.

  This embodiment is compatible with the hot water supply mode shown in FIGS. 10 and 11 in addition to the heat storage mode of FIG. 5 and the hot water supply modes of FIGS. 6 and 7.

  FIG. 10 shows a hot water supply mode using the heat pump 20. In the hot water supply mode of the heat storage unit 50 in FIG. 7, the heat pump 20 is operated when the heat storage amount of the heat storage unit 50 becomes lower than a predetermined level. As a result, as shown in FIG. 10, the hot water heated by the heat pump 20 is introduced into the water distribution unit 95. That is, in the operating state of the heat pump 20, water is introduced from the supply source 15 to the first path 32, and the water flowing through the first heating pipe 42 of the first path 32 is heated by the heat transferred from the fifth heat radiating unit 23E. The warm water is stored in the tank 36. In parallel with this, water is also introduced from the supply source 15 to the second path 34, and the water flowing through the second heating pipe 44 of the second path 34 is heated by the heat transferred from the first to fourth heat radiating portions 23D. The hot water is stored in the tank 36. Hot water from the tank 36 is supplied from the water distribution unit 95 to facilities such as a bath, a kitchen, and a washroom. The temperature of water from the supply source 15 is, for example, about 20 ° C., and the temperature of hot water in the tank 36 is, for example, about 50-55 ° C. This mode can be used, for example, as a complementary hot water supply mode when the heat storage amount of the heat storage unit 50 is reduced.

  FIG. 11 shows a hot water supply mode using the heat storage unit 50 and the heat pump 20. As shown in FIG. 11, the heat pump 20 is operated in a state where the heat storage material 52 of the heat storage unit 50 retains heat at a certain level or higher. As a result, hot water heated by the heat storage unit 50 and the heat pump 20 is introduced into the water distribution unit 95. That is, in the operating state of the heat pump 20, water is introduced from the supply source 15 to the first path 32, and the water flowing through the first heating pipe 42 of the first path 32 is heated by the heat transferred from the fifth heat radiating unit 23E. The warm water is stored in the tank 36. In parallel with this, water is also introduced from the supply source 15 to the second path 34, and the water flowing through the second heating pipe 44 of the second path 34 is transferred heat from the heat storage material 52 and the first to fourth heat dissipation. Heated by the heat transferred from the section 23 </ b> D, the hot water is stored in the tank 36. Hot water from the tank 36 is supplied from the water distribution unit 95 to facilities such as a bath, a kitchen, and a washroom. The temperature of water from the supply source 15 is, for example, about 20 ° C., and the temperature of hot water in the tank 36 is, for example, about 50-55 ° C. This mode can be used as a complementary hot water supply mode when, for example, a relatively large hot water supply demand occurs.

  FIG. 12 is a schematic diagram showing the third embodiment. In the following description, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  In the hot water supply system 10B of FIG. 12, a plurality (two) of heat storage materials 52A and 52B having different melting points are used as the heat storage materials. In the present embodiment, the supply unit 30 includes a water supply source 15, a first path 32, a second path 34, a third path 36, a hot water storage tank (first tank 36A and second tank 36B), and a discharge pipe (first tank). 1 discharge pipe 38A and 2nd discharge pipe 38B). The supply unit 30 further includes a pump and a valve as necessary. In the present embodiment, water from the supply source 15 is sent to the first path 32 and / or the second path 34 via the valve 41. Under the control of the control device 70, the flow rate of water flowing through the first path 32 and the flow rate of water flowing through the second path 34 are controlled via the valve 41 and / or other flow rate control means. Further, the warm water from the first tank 36A is sent to the third path 36 and / or the first discharge pipe 38A via the valve 43. The flow rate of water flowing through the third path 36 is controlled by the control of the control device 70 via the valve 43 and / or other flow rate control means.

  The second path 34 includes a second heating pipe 44 that is thermally connected to the heat storage unit 50 and through which water from the supply source 15 flows. The water in the second heating pipe 44 rises in temperature due to the heat transferred from the heat storage unit 50. The first path 32 and the second path 34 are fluidly connected to the first tank 36A. That is, the hot water from the first heating pipe 42 of the first path 32 is sent to the first tank 36A. Hot water from the second heating pipe 44 of the second path 34 is also sent to the first tank 36A. You may arrange | position the level sensor and / or gas-liquid separator which measure a liquid level in the 1st tank 36A. Hot water from the first tank 36 </ b> A is sent to the water distribution unit 95 via the first discharge pipe 38 </ b> A, or is sent to the third path 36 via the valve 43.

  The third path 36 includes a third heating pipe 46 that is thermally connected to the heat storage unit 50 and through which hot water from the first tank 36A flows. The temperature of the hot water in the third heating pipe 46 is further increased by the heat transferred from the heat storage unit 50. The third path 36 is fluidly connected to the second tank 36B. Hot water from the third heating pipe 46 of the third path 36 is sent to the second tank 36B. You may arrange | position the level sensor and / or gas-liquid separator which measure a liquid level in the 2nd tank 36B. Hot water from the second tank 36B is sent to the water distribution unit 95 via the second discharge pipe 38B.

  The heat storage unit 50 stores the first heat storage unit 50A having the first heat storage material 52A that stores heat transmitted from the fourth heat radiation unit 23D of the heat pump 20 and the heat transmitted from the first to third heat radiation units 23A to 23C of the heat pump 20. It has the 2nd heat storage part 50B which has the 2nd heat storage material 52B. As each structure of the heat storage units 50A and 50B of the heat storage unit 50, for example, the form shown in FIGS. 2A-2C or 9A-9C can be applied. The heat of the first heat storage material 52 </ b> A of the first heat storage unit 50 </ b> A is transmitted to the second heating pipe 44 of the supply unit 30. The heat of the second heat storage material 52 </ b> B of the second heat storage unit 50 </ b> B is transmitted to the third heating pipe 46 of the supply unit 30.

  Depending on the specifications of the hot water supply system 10, the material characteristics of the heat storage materials 52A and 52B are determined. Both the heat storage materials 52A and 52B include a latent heat storage material (PCM) that stores and dissipates heat with a liquid-solid phase change. That is, the heat storage materials 52A and 52B store heat when melting and dissipate heat when solidified. In the present embodiment, the melting point of the second heat storage material 52B is higher than the melting point of the first heat storage material 52A. For example, the melting point of the first heat storage material 52A is 50 to 65 ° C., and the melting point of the second heat storage material 52B is 70 to 120 ° C. Further, the compression ratios of the first to third compression portions 22A to 22C of the heat pump 20 are set according to the melting point of the first heat storage material 52A, and the fourth of the heat pump 20 is set according to the melting point of the second heat storage material 52B. The compression ratio of the compression unit 22D is set.

  In the present embodiment, when the heat pump 20 is operated, the water flowing through the first path 32 is heated by the first heat exchanger 61, and the hot water is stored in the first tank 36A. The temperature of water from the supply source 15 is, for example, about 20 ° C., and the temperature of hot water in the first tank 36A is, for example, about 50-55 ° C. Furthermore, heat from the fourth heat radiating unit 23D of the heat pump 20 is stored in the first heat storage unit 50A (first heat storage material 52A), and heat from the first to third heat radiating units 23A to 23C of the heat pump 20 is second heat storage. It is stored in the part 50B (second heat storage material 52B). That is, in the first heat storage unit 50A, the first heat storage material 52A is heated by the heat transmitted from the fourth heat dissipation unit 23D, and the first heat storage material 52A melts as the phase of the first heat storage material 52A changes from solid to liquid. Latent heat is stored. Moreover, in the 2nd heat storage part 50B, the 2nd heat storage material 52B is heated with the heat | fever transmitted from the 1st-3rd thermal radiation part 23A-23C, and with the phase change from the solid of the 2nd heat storage material 52B to 2nd, it is 2nd. The latent heat of fusion of the heat storage material 52B is stored.

  Hot water stored in the first tank 36A is sent to the first water distribution unit 95A via the first discharge pipe 38A by control of a valve, a pump, or the like in response to a relatively low temperature hot water demand. At this time, the water flowing through the second path 34 is heated by the heat from the first heat storage unit 50A, and the hot water is sent to the first tank 36A. The warm water temperature of the first water distribution unit 95A is, for example, 50 to 55 ° C.

  Further, the hot water stored in the first tank 36 </ b> A flows through the third path 36 by controlling valves and pumps according to the demand for hot water at a relatively high temperature. The water in the 3rd heating piping 46 of the 3rd path | route 36 is further heated with the heat from the 2nd heat storage part 50B, and the warm water is sent to the 2nd tank 36B. Hot water from the second tank 36B is sent to the second water distribution section 95B. The warm water temperature of the 2nd water distribution part 95B is 65-90 degreeC, for example. The hot water from the second water distribution unit 95B is mixed with the hot water of the first water distribution unit 95A as necessary, and supplied to various facilities such as a bath, a kitchen, and a washroom.

  Thus, in this embodiment, it is possible to meet low-temperature and high-temperature hot water demands by using two heat storage materials 52A and 52B having different melting points. By selecting the heat storage material 52 and optimizing the compression ratios of the compression units 22A to 22D, it is possible to flexibly cope with various temperature demand patterns. Moreover, the temperature control precision of the heating temperature (output temperature) of water can be improved by mixing the warm water from two tanks 36A and 38B suitably.

  Also in the present embodiment, the hot water is stored in the tanks 36A and 36B, which is advantageous for shortening the rising time of the hot water supply. The capacity (hot water storage space) of the tanks 36A and 36B only needs to have a size corresponding to, for example, a rising time (time until hot water supply using the heat storage material 52 is possible), and can be reduced as compared with the conventional case.

  Moreover, in this embodiment, in hot hot water supply, the hot water heated by the 1st heat exchanger 61 or the 1st heat storage part 50A is reheated by the 2nd heat storage part 50B. A small temperature difference between the two objects subjected to heat exchange is advantageous for improving COP.

  FIG. 13 is a schematic diagram showing the fourth embodiment. In the following description, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  In the hot water supply system 10C of FIG. 13, as in the third embodiment, a plurality (two) of heat storage materials 52A and 52B having different melting points are used as the heat storage materials. In the present embodiment, unlike the third embodiment, the second heat storage material 52B having a low melting point is used for the front part of the compression part 22 of the heat pump 20, and the first heat storage having a high melting point for the rear part of the compression part 22. Material 52A is used.

  In the present embodiment, the supply unit 30 includes a water supply source 15, a first path 32, a second path 34, a third path 36, a hot water storage tank (first tank 36A and second tank 36B), and a discharge pipe (first tank). 1 discharge pipe 38A and 2nd discharge pipe 38B). The supply unit 30 further includes a pump and a valve as necessary. In the present embodiment, water from the supply source 15 is sent to the first path 32 and / or the second path 34 via the valve 41. Under the control of the control device 70, the flow rate of water flowing through the first path 32 and the flow rate of water flowing through the second path 34 are controlled via the valve 41 and / or other flow rate control means. Further, the warm water from the first tank 36A is sent to the third path 36 and / or the first discharge pipe 38A via the valve 43. The flow rate of water flowing through the third path 36 is controlled by the control of the control device 70 via the valve 43 and / or other flow rate control means.

  The second path 34 includes a second heating pipe 44 that is thermally connected to the heat storage unit 50 and through which water from the supply source 15 flows. The water in the second heating pipe 44 rises in temperature due to the heat transferred from the heat storage unit 50. In the present embodiment, the first path 32 is fluidly connected to the second tank 36B, and the second path 34 is fluidly connected to the first tank 36A. That is, the hot water from the first heating pipe 42 of the first path 32 is sent to the second tank 36B. Hot water from the second heating pipe 44 of the second path 34 is sent to the first tank 36A. Hot water from the first tank 36 </ b> A is sent to the water distribution unit 95 via the first discharge pipe 38 </ b> A, or is sent to the third path 36 via the valve 43. Hot water from the second tank 36B is sent to the water distribution unit 95 via the second discharge pipe 38B.

  The third path 36 includes a third heating pipe 46 that is thermally connected to the heat storage unit 50 and through which hot water from the first tank 36A flows. The temperature of the hot water in the third heating pipe 46 is further increased by the heat transferred from the heat storage unit 50. The third path 36 is fluidly connected to the second tank 36B. Hot water from the third heating pipe 46 of the third path 36 is sent to the second tank 36B.

  The heat storage unit 50 includes a first heat storage unit 50 </ b> A having a first heat storage material 52 </ b> A that stores heat transmitted from the first to third heat radiation units 23 </ b> A to 23 </ b> C (the front part of the compression unit 22) of the heat pump 20, and a fourth of the heat pump 20. It has the 2nd heat storage part 50B which has the 2nd heat storage material 52B which stores the heat transmitted from thermal radiation part 23D (rear part of compression part 22). As each structure of the heat storage units 50A and 50B of the heat storage unit 50, for example, the form shown in FIGS. 2A-2C or 9A-9C can be applied. The heat of the first heat storage material 52 </ b> A of the first heat storage unit 50 </ b> A is transmitted to the second heating pipe 44 of the supply unit 30. The heat of the second heat storage material 52 </ b> B of the second heat storage unit 50 </ b> B is transmitted to the third heating pipe 46 of the supply unit 30.

  Depending on the specifications of the hot water supply system 10, the material characteristics of the heat storage materials 52A and 52B are determined. Both the heat storage materials 52A and 52B include a latent heat storage material (PCM) that stores and dissipates heat with a liquid-solid phase change. The melting point of the second heat storage material 52B is higher than the melting point of the first heat storage material 52A. For example, the melting point of the first heat storage material 52A is 50 to 65 ° C., and the melting point of the second heat storage material 52B is 70 to 120 ° C. Further, the compression ratios of the first to third compression portions 22A to 22C of the heat pump 20 are set according to the melting point of the first heat storage material 52A, and the fourth of the heat pump 20 is set according to the melting point of the second heat storage material 52B. The compression ratio of the compression unit 22D is set.

  In the present embodiment, when the heat pump 20 is operated, the water flowing through the first path 32 is heated by the first heat exchanger 61, and the hot water is stored in the second tank 36B. The temperature of the water from the supply source 15 is, for example, about 20 ° C., and the temperature of the hot water in the second tank 36B is, for example, 65 to 90 ° C. Furthermore, the heat from the first to third heat radiating portions 23A to 23C of the heat pump 20 is stored in the first heat storage portion 50A (first heat storage material 52A), and the heat from the fourth heat radiating portion 23D of the heat pump 20 is the second heat storage. It is stored in the part 50B (second heat storage material 52B). That is, in the first heat storage unit 50A, the first heat storage material 52A is heated by the heat transmitted from the first to third heat radiation units 23A to 23C, and the latent heat of fusion of the first heat storage material 52A is stored. Moreover, in the 2nd heat storage part 50B, the 2nd heat storage material 52B is heated with the heat | fever transmitted from 4th thermal radiation part 23D, and the 2nd heat storage material 52B melting latent heat is stored.

  Hot water stored in the first tank 36A is sent to the first water distribution unit 95A via the first discharge pipe 38A by control of a valve, a pump, or the like in response to a relatively low temperature hot water demand. At this time, the water flowing through the second path 34 is heated by the heat from the first heat storage unit 50A, and the hot water is sent to the first tank 36A. The warm water temperature of the first water distribution unit 95A is, for example, 50 to 55 ° C.

  Further, the hot water stored in the first tank 36 </ b> A flows through the third path 36 by controlling valves and pumps according to the demand for hot water at a relatively high temperature. The water in the 3rd heating piping 46 of the 3rd path | route 36 is further heated with the heat from the 2nd heat storage part 50B, and the warm water is sent to the 2nd tank 36B. Hot water from the second tank 36B is sent to the second water distribution section 95B. The warm water temperature of the 2nd water distribution part 95B is 65-90 degreeC, for example. The hot water from the second water distribution unit 95B is mixed with the hot water of the first water distribution unit 95A as necessary, and supplied to various facilities such as a bath, a kitchen, and a washroom.

  Thus, also in this embodiment, by using the two heat storage materials 52A and 52B having different melting points, it is possible to meet the demand for hot water at low and high temperatures. By selecting the heat storage material 52 and optimizing the compression ratios of the compression units 22A to 22D, it is possible to flexibly cope with various temperature demand patterns. Moreover, the temperature control precision of the heating temperature (output temperature) of water can be improved by mixing the warm water from two tanks 36A and 38B suitably.

  In this embodiment, the position of the low temperature heating and the position of the high temperature heating are substantially replaced with respect to the third embodiment. The position setting for each temperature heating is optimized according to the design requirements. In another embodiment, the number of heat storage materials having different melting points can be 3 or more.

  The numerical value used in the above description is an example, and the present invention is not limited to this.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments. The numerical value used in the above description is an example, and the present invention is not limited to this. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention. The present invention is not limited by the above description, but only by the appended claims.

It is the schematic which shows 1st Embodiment. It is a structural example of a thermal storage unit. It is another structural example of a thermal storage unit. It is another structural example of a thermal storage unit. It is a figure corresponding to a 1st embodiment and showing typically an example of a temperature change of a working medium of a heat pump, and a latent heat storage material accompanying heat exchange. It is a figure which shows typically an example of the temperature change of the working medium of a heat pump, and a latent heat storage material accompanying heat exchange corresponding to the form which applied the latent heat storage material to the conventional hot-water supply system. It is a figure which shows the example of the thermal storage mode of a hot water supply system. It is a figure which shows the example of the hot water supply mode of a hot water supply system. It is a figure which shows another example of the hot water supply mode of a hot water supply system. It is the schematic which shows 2nd Embodiment. It is a structural example of a thermal storage unit. It is another structural example of a thermal storage unit. It is another structural example of a thermal storage unit. It is a figure which shows another example of the hot water supply mode of a hot water supply system. It is a figure which shows another example of the hot water supply mode of a hot water supply system. It is the schematic which shows 3rd Embodiment. It is the schematic which shows 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10, 10A, 10B, 10C ... Hot water supply system, 15 ... Supply source, 20 ... Heat pump, 21 ... Heat absorption part, 22 ... Compression part, 23 ... Radiation part, 24 ... Expansion part, 25 ... Main path, 27 ... Bypass path, 28 ... regenerator, 30 ... supply unit, 31 ... heating unit, 36 ... tank, 38 ... discharge pipe, 42, 44, 46 ... heating pipe, 50 ... heat storage unit, 50A ... first heat storage unit, 50B ... second Heat storage section, 52 ... heat storage material, 52A ... first heat storage material, 52B ... second heat storage material, 61 ... first heat exchanger, 70 ... control device, 95 ... water distribution section.

Claims (9)

A heat pump through which the first medium flows, and the heat pump having a compression section that compresses the first medium in multiple stages;
A heat storage unit that is thermally connected to the heat pump and stores heat from the heat pump;
A supply unit through which the second medium flows, the supply unit in which the second medium is heated by heat from at least one of the heat storage unit and the heat pump;
A hot water supply system comprising:   2. The heat pump according to claim 1, further comprising: a first heat radiating unit that heats the heat storage material by latent heat, and a second heat radiating unit that heats the second medium by sensible heat. The hot water supply system described.   The heat pump includes a bypass path in which a part of the first medium from the first heat radiating part bypasses the second heat radiating part, and heat from the first medium in the bypass path is upstream of the compression part. The hot water supply system according to claim 2, further comprising a regenerator that is transmitted to the first medium.   The hot water supply system according to claim 2 or 3, wherein the supply unit includes a tank that stores the second medium heated by the second heat radiating unit. It is a first mode in which the heat pump operates, and has an operation of storing heat from the first heat radiating unit in the heat storage unit and an operation of storing the second medium heated by the second heat radiating unit in the tank. The first mode;
A second mode in which the second medium heated by the second heat radiating unit is supplied from the tank;
A third mode for supplying the second medium heated by heat from the heat storage unit;
The hot water supply system according to claim 4, further comprising:   The hot water supply system according to any one of claims 1 to 5, further comprising a control device that controls an operating state of the heat pump according to a time zone.   The hot water supply system according to any one of claims 1 to 6, wherein the heat storage unit includes a latent heat storage material.   The hot water supply system according to claim 7, wherein the latent heat storage material includes a plurality of materials having different melting points.   The heat storage unit further includes a first heat storage unit from which the second medium having a first temperature is supplied, and a second heat storage unit from which the second medium having a second temperature is supplied. The hot water supply system according to claim 8.

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