WO2022244195A1 - 給湯機 - Google Patents

給湯機 Download PDF

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Publication number
WO2022244195A1
WO2022244195A1 PCT/JP2021/019178 JP2021019178W WO2022244195A1 WO 2022244195 A1 WO2022244195 A1 WO 2022244195A1 JP 2021019178 W JP2021019178 W JP 2021019178W WO 2022244195 A1 WO2022244195 A1 WO 2022244195A1
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WO
WIPO (PCT)
Prior art keywords
heat storage
storage tank
heat
water heater
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/019178
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English (en)
French (fr)
Japanese (ja)
Inventor
慶和 矢次
純一 中園
有理子 西村
健 篠▲崎▼
誠治 中島
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2023522125A priority Critical patent/JP7603803B2/ja
Priority to PCT/JP2021/019178 priority patent/WO2022244195A1/ja
Publication of WO2022244195A1 publication Critical patent/WO2022244195A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Definitions

  • This disclosure relates to a water heater equipped with a heat storage tank that stores heat generated by a heat source.
  • Such a water heater has a configuration in which heat generated in advance by a heat source is stored in a heat storage tank unit when hot water is supplied, and the stored heat is used to heat feed water to supply hot water.
  • a heat storage tank unit used in a water heater a technique is known in which the shape of the tank is made cylindrical, mainly for the purpose of improving pressure resistance.
  • a heat storage tank is formed of a plurality of plates, the interval between adjacent plates is kept constant, a plurality of heat storage materials are arranged between the plates, and a flow path portion where water flows between the plates
  • a water heater is disclosed that forms a
  • Patent Document 1 has a problem that if the plate portion is damaged due to corrosion or the like, the heat storage material may be mixed with the water supply.
  • the present disclosure has been made in view of the problems in the conventional technology described above, and aims to provide a water heater that can prevent the heat storage material from being mixed into the water supply.
  • a water heater includes a heating device that heats a fluid, and a heat storage tank unit that stores heat by storing the fluid heated by the heating device, and uses the heat stored in the heat storage tank unit.
  • the heat storage tank unit includes a heat storage unit that stores the heated fluid, the heat storage unit being a first heat storage tank into which the heated fluid flows; a second heat storage tank that contains a heat storage material different from the fluid, is formed separately from the first heat storage tank, and is disposed in contact with the first heat storage tank;
  • the first heat storage tank that constitutes the heat storage section that stores the heated fluid and the second heat storage tank that stores the heat storage material are formed separately. Therefore, even if the second heat storage tank is damaged and the heat storage material inside leaks out, it is possible to prevent the heat storage material from entering the water supply.
  • FIG. 1 is a schematic diagram showing an example of a configuration of a water heater according to Embodiment 1;
  • FIG. FIG. 2 is a perspective view showing an example of the structure of the heat storage unit shown in FIG. 1;
  • FIG. 2 is a top view showing an example of the structure of the heat storage unit in FIG. 1;
  • FIG. 4 is a cross-sectional view of the heat storage unit shown in FIG. 3 taken along the line AA;
  • FIG. 11 is a perspective view showing an example of the structure of a heat storage unit according to Embodiment 2;
  • FIG. 10 is a top view showing an example of the structure of a heat storage unit according to Embodiment 2;
  • 7 is a cross-sectional view of the heat storage unit shown in FIG. 6 taken along the line BB.
  • FIG. FIG. 7 is a cross-sectional view taken along line BB of a modification of the heat storage unit shown in FIG. 6;
  • Embodiment 1 A water heater according to Embodiment 1 will be described.
  • the water heater according to the first embodiment uses a heating device such as a heat pump to heat a fluid to store heat during late-night hours when the hourly contract power unit price is low, and uses the stored heat for hot water supply. It is.
  • FIG. 1 is a schematic diagram showing an example of the configuration of a water heater according to Embodiment 1.
  • water heater 100 includes heat storage tank unit 1 and heating device 2 .
  • the heat storage tank unit 1 and the heating device 2 are pipe-connected on site.
  • the heat storage tank unit 1 and the heating device 2 are connected by pipes 3 and 4 .
  • a water supply pipe 5 and a hot water supply pipe 6 are connected to the heat storage tank unit 1 .
  • the water supply pipe 5 and the hot water supply pipe 6 are connected to terminals such as a shower and a faucet at the site, respectively.
  • the heating device 2 is heating means for heating the fluid supplied from the heat storage tank unit 1 .
  • the heating device 2 for example, an electric heater, a gas boiler, a heat pump unit, or the like is used. In this example, a case where a heat pump unit is used as the heating device 2 will be described.
  • the heating device 2 includes a compressor 21 , a heating heat exchanger 22 , a pressure reducing device 23 and an endothermic heat exchanger 24 .
  • the compressor 21, the heating heat exchanger 22, the pressure reducing device 23, and the endothermic heat exchanger 24 are connected in a ring by refrigerant pipes to form a refrigerant circuit in which a refrigerant such as carbon dioxide circulates.
  • the compressor 21 sucks in a low-temperature, low-pressure refrigerant, compresses the sucked-in refrigerant, and discharges a high-temperature, high-pressure refrigerant.
  • the compressor 21 is, for example, an inverter compressor or the like whose capacity, which is the amount of refrigerant delivered per unit time, is controlled by changing the operating frequency.
  • the heating heat exchanger 22 has two flow paths formed therein: a refrigerant-side flow path through which the refrigerant circulating in the refrigerant circuit flows, and a fluid-side flow path through which the fluid circulating in the boiling circuit described later flows. there is The heating heat exchanger 22 exchanges heat between the refrigerant flowing through the refrigerant-side channel and the fluid flowing through the fluid-side channel.
  • the heating heat exchanger 22 functions as a condenser that radiates the heat of the refrigerant to the fluid to condense the refrigerant.
  • the decompression device 23 is, for example, an expansion valve, and decompresses and expands the refrigerant.
  • the decompression device 23 is composed of, for example, a valve such as an electronic expansion valve whose degree of opening can be controlled.
  • the endothermic heat exchanger 24 exchanges heat between the refrigerant and the air supplied by a nearby fan (not shown) or the like.
  • the endothermic heat exchanger 24 evaporates the refrigerant and cools the air with the heat of vaporization.
  • a fin-and-tube heat exchanger is used as the endothermic heat exchanger 24.
  • the heat storage tank unit 1 stores heat by storing the fluid heated by the heating device 2 .
  • the heat storage tank unit 1 includes a heat storage unit 10, a heating device pump 11, a hot water supply pump 12, a heat exchanger 13, and a mixing valve 14, and is connected to a water supply pipe 5 and a hot water supply pipe 6 connected to external terminals.
  • the fluid circulates through the heat storage section 10, the heating device pump 11, the endothermic heat exchanger 24 of the heating device 2, and the heat storage section 10, thereby forming a boiling circuit that heats the fluid.
  • fluid circulates through the heat storage unit 10, the heat exchanger 13, the hot water supply pump 12, and the heat storage unit 10, thereby forming a hot water supply heating circuit for heating water such as city water.
  • Water or antifreeze is used as the fluid that circulates in the boiling circuit and the hot water supply heating circuit. It is preferable to use water as the fluid because water is cheaper than antifreeze.
  • the heat storage unit 10 stores heated fluid supplied from the heating device 2 via the pipe 4 . Although details will be described later, an upper pipe 33 is provided above the heat storage unit 10, and a lower pipe 34 is provided below the heat storage unit 10 (see FIGS. 2 to 4).
  • the heat storage unit 10 is composed of a first heat storage tank 30 and a second heat storage tank 40 . A detailed configuration of the heat storage unit 10 will be described later.
  • the heating device pump 11 is driven by a motor (not shown) so as to send the fluid flowing out of the lower pipe 34 of the heat storage unit 10 to the heating heat exchanger 22 of the heating device 2 via the pipe 3 .
  • the hot water supply pump 12 is driven by a motor (not shown) so as to send the fluid flowing out of the upper pipe 33 of the heat storage unit 10 to the heat exchanger 13 .
  • the heat exchanger 13 is formed therein with two flow paths, a primary side flow path through which the fluid flowing out from the heat storage section 10 flows, and a secondary side flow path through which the fluid branched from the water supply pipe 5 flows. .
  • the heat exchanger 13 exchanges heat between fluids flowing through two channels formed inside.
  • the heat exchanger 13 is, for example, a plate-type heat exchanger, and is formed by processing metal such as stainless steel, aluminum, or copper into flat plates and laminating them.
  • the mixing valve 14 is, for example, a three-way valve, and has a first inlet connected to the heat exchanger 13, a second inlet connected to a flow path branched from the water supply pipe 5, and a hot water supply pipe 6. and an outlet.
  • the mixing valve 14 mixes the high-temperature fluid flowing into the first inlet and the fluid such as city water supplied through the water supply pipe 5 flowing into the second inlet, and causes the mixture to flow out from the outlet.
  • a temperature sensor (not shown) is provided on the downstream side of the mixing valve 14, and the mixing ratio of the fluids in the mixing valve 14 is controlled so that the temperature of the mixed fluid detected by the temperature sensor becomes the set temperature. be.
  • FIG. 2 is a perspective view showing an example of the structure of the heat storage unit in FIG. 1.
  • FIG. 3 is a top view showing an example of the structure of the heat storage unit in FIG. 1.
  • FIG. 4 is a cross-sectional view of the heat storage unit shown in FIG. 3, taken along the line AA.
  • the heat storage section 10 is composed of a first heat storage tank 30 and a second heat storage tank 40 formed separately from the first heat storage tank 30.
  • FIGS. 1 is a perspective view showing an example of the structure of the heat storage unit in FIG. 1.
  • FIG. 3 is a top view showing an example of the structure of the heat storage unit in FIG. 1.
  • FIG. 4 is a cross-sectional view of the heat storage unit shown in FIG. 3, taken along the line AA.
  • the heat storage section 10 is composed of a first heat storage tank 30 and a second heat storage tank 40 formed separately from the first heat storage tank 30.
  • the first heat storage tank 30 is formed in a hollow prismatic shape having a rectangular parallelepiped cross-sectional shape, and is made of stainless steel, for example.
  • the thickness of the sidewall of the first heat storage tank 30 is, for example, about 2 to 3 mm.
  • the first heat storage tank 30 has a stepped portion in the height direction (z direction), and is formed of a first stepped portion 31 on the lower side and a second stepped portion 32 on the upper side.
  • the height of the first stepped portion 31 is approximately 1.5 to 2 times the height of the second stepped portion 32 .
  • Each side of the first stepped portion 31 in the width direction (x direction) and the depth direction (y direction) is longer than each side of the second stepped portion 32 in the same direction by about 200 mm. That is, when the second stepped portion 32 is cut along a horizontal plane defined by the width direction (x direction) and the depth direction (y direction), the cut surface of the second stepped portion 32 is larger than the cut surface of the first stepped portion 31 similarly cut along the horizontal plane. is also small. Furthermore, on the same side surface of the first stepped portion 31 and the second stepped portion 32, the distance from the side surface of the first stepped portion 31 to the side surface of the second stepped portion 32 is approximately 100 mm.
  • first stepped portion 31 and the second stepped portion 32 By forming the first stepped portion 31 and the second stepped portion 32 in this way, when the first heat storage tank 30 is viewed from above, the intersection of the diagonal lines of the first stepped portion 31 and the second stepped portion 32 are at the same position in the width direction (x direction) and the depth direction (y direction).
  • An upper pipe 33 that protrudes upward is formed on the upper surface of the first stepped portion 31 .
  • a bottom pipe 34 that protrudes downward is formed on the bottom surface of the second stepped portion 32 .
  • the upper pipe 33 and the lower pipe 34 are formed so that the fluid stored inside the first heat storage tank 30 can flow in and out.
  • the upper pipe 33 and the lower pipe 34 are substantially parallel to each other in the width direction (x direction) and depth direction (y direction) from the intersection of the diagonal lines of the second stepped portion 32 . It is preferable that they are formed at the same position.
  • the second heat storage tank 40 is formed to cover and abut on the side surface of the second stepped portion 32 of the first heat storage tank 30 .
  • the outer periphery of the second heat storage tank 40 is formed to have the same dimensions as the outer periphery of the first stepped portion 31 of the first heat storage tank 30 .
  • the inner periphery of the second heat storage tank 40 is formed to have the same dimensions as the outer periphery of the second stepped portion 32 of the first heat storage tank 30 .
  • the second heat storage tank 40 is made of, for example, stainless steel and has a hollow prismatic shape with a cuboid cross section.
  • the thickness of the side wall of the second heat storage tank 40 is, for example, about 2 mm, and is the same as or thinner than the side wall of the first heat storage tank 30 .
  • the height of the second heat storage tank 40 is the same as the height of the second stepped portion 32 in the first heat storage tank 30 .
  • a heat storage material is stored in each of the first heat storage tank 30 and the second heat storage tank 40 .
  • Water is stored in the first heat storage tank 30 as a heat storage material.
  • a heat storage material different from that in the first heat storage tank 30 is stored in the second heat storage tank 40 .
  • a latent heat storage material is stored in the second heat storage tank 40 as a heat storage material.
  • a latent heat storage material is a heat storage material that stores latent heat as a result of a phase change from a solid to a liquid due to melting.
  • the sensible heat storage material refers to a heat storage material that stores sensible heat using temperature change without phase change. Since the water stored in the first heat storage tank 30 does not undergo a phase change, it is classified as a sensible heat storage material in this application.
  • the latent heat storage material may be, for example, a hydrate medium such as sodium acetate trihydrate or sodium thiosulfate pentahydrate, or an organic medium such as paraffin.
  • a hydrate medium such as sodium acetate trihydrate or sodium thiosulfate pentahydrate
  • an organic medium such as paraffin.
  • An example melting point of sodium acetate trihydrate is 58°C
  • an example melting point of sodium thiosulfate pentahydrate is 48°C
  • an example melting point of paraffin is 56°C.
  • An example of the heat storage density of these latent heat storage materials in a certain temperature range is 0.54 MJ/L for sodium acetate trihydrate and 0.28 MJ/L for paraffin.
  • sodium acetate trihydrate has a higher heat storage density than paraffin, but lacks stability in phase change due to the supercooling phenomenon in which the phase does not change from liquid to solid at the melting point. Therefore, from the viewpoint of stability as well as heat storage density, it is preferable to select a heat storage material such as paraffin that undergoes a stable phase change as the latent heat storage material. Further, since the latent heat storage material has a larger amount of heat storage than the sensible heat storage material, using the latent heat storage material as the heat storage material is advantageous for miniaturization of water heater 100 .
  • the inner periphery of the second heat storage tank 40 is preferably configured to have a thinner plate thickness than the outer periphery. This is to improve the heat transfer performance between the first heat storage tank 30 and the second heat storage tank 40 that are in contact with each other. Moreover, the same effect can be obtained by configuring the plate thickness of the second stepped portion 32 in the first heat storage tank 30 so as to be thinner than the plate thickness of the other portions.
  • a plurality of fin-shaped plate members may be arranged in the second heat storage tank 40 so as to extend from the inner circumference toward the outer circumference.
  • the fin-shaped plate material is desirably made of, for example, aluminum having a high thermal conductivity.
  • the inner wall of the second heat storage tank 40 may be subjected to processing such as fluorine coating that makes it difficult for paraffin, which is a latent heat storage material, to adhere.
  • processing such as fluorine coating that makes it difficult for paraffin, which is a latent heat storage material, to adhere.
  • the lower pipe 34 is the outlet through which the fluid flows from the heat storage unit 10 to the boiling circuit, that is, the outlet through which the fluid is supplied from the heat storage unit 10 to the heating device 2 .
  • the lower pipe 34 also serves as an inlet through which fluid flows into the heat storage unit 10 via the hot water supply heating circuit, that is, an inlet through which the fluid heat-exchanged in the heat exchanger 13 flows.
  • the upper pipe 33 is the inlet through which the fluid flows into the heat storage unit 10 via the boiling circuit, that is, the inlet through which the fluid heated by the heating device 2 flows into the heat storage unit 10 .
  • the upper pipe 33 also serves as an outlet for fluid flowing out from the heat storage unit 10 to the hot water heating circuit, that is, an outlet for supplying fluid from the heat storage unit 10 to the heat exchanger 13 .
  • the upper pipe 33 and the lower pipe 34 are parts that function as inlets and outlets when the fluid circulates through the two circulation paths. Therefore, the upper pipe 33 and the lower pipe 34 are provided with, for example, a T-shaped joint so that the flow path is branched into two.
  • the upper pipe 33 and the lower pipe 34 are shared parts of the two circulation circuits, but the present invention is not limited to this. Inflow and outflow piping may be further provided.
  • a heat conductive material such as heat conductive grease or a heat conductive sheet is applied to the contact surfaces of these two tanks. It is preferable to place the material. This is for promoting heat conduction between the first heat storage tank 30 and the second heat storage tank 40 and improving the heat transfer performance.
  • a heat insulating material (not shown) may be arranged around the outer periphery of the heat storage section 10 . Thereby, natural heat radiation from the heat storage unit 10 can be suppressed.
  • a heat insulating material used at this time for example, a flat vacuum heat insulating material, a foam heat insulating material such as expanded polystyrene or expanded polypropylene for closing the gap between the vacuum heat insulating material and the vacuum heat insulating material, or a urethane heat insulating material is used. be done.
  • the outer circumference of the second heat storage tank 40 has the same dimensions as the outer circumference of the first stepped portion 31, and the inner circumference of the second heat storage tank 40 has the same dimensions as the outer circumference of the second stepped portion 32.
  • the first heat storage tank 30 may be formed without a step, and the second heat storage tank 40 may be arranged to cover the upper side of the first heat storage tank 30 .
  • boiling operation (heat storage operation)
  • the boiling operation is an operation in which the heating device 2 boils low-temperature water to a high temperature and stores the boiled water in the heat storage unit 10 .
  • the boiling operation is mainly carried out during a time period such as a late-night electric power time period in which electricity prices are low, or when the amount of heat stored in the heat storage unit 10 has decreased.
  • the low-temperature, low-pressure gas refrigerant is compressed by the compressor 21 and discharged as a high-temperature, high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 21 flows into the heating heat exchanger 22, exchanges heat with the water flowing through the boiling circuit, condenses while releasing heat, and becomes a high-pressure liquid refrigerant for heating and heat exchange. It flows out of vessel 22 .
  • the high-pressure liquid refrigerant that has flowed out of the heating heat exchanger 22 is decompressed by the decompression device 23 to become a low-temperature, low-pressure gas-liquid two-phase refrigerant.
  • the low-temperature, low-pressure gas-liquid two-phase refrigerant flows into the endothermic heat exchanger 24, where it exchanges heat with air taken in by a fan (not shown), absorbs heat and evaporates, becomes a low-pressure gas refrigerant, and is sucked into the compressor 21. be.
  • the heating device pump 11 is driven, whereby the water stored in the lower portion of the first heat storage tank 30 of the heat storage section 10 flows out from the lower pipe 34 .
  • the water that has flowed out of the first heat storage tank 30 is sucked into the suction side of the heating device pump 11, pressurized, and sent.
  • the water sent from the heating device pump 11 flows into the heating heat exchanger 22 of the heating device 2 via the pipe 3 .
  • the water that has flowed into the heating heat exchanger 22 exchanges heat with the refrigerant flowing through the refrigerant-side channel to become high-temperature water, and flows out of the heating heat exchanger 22 .
  • the high-temperature water that has flowed out of the heating heat exchanger 22 flows into the upper portion of the first heat storage tank 30 via the pipe 4 and the upper pipe 33 .
  • the water stored in the lower part of the first heat storage tank 30 depends on the season. It has become water.
  • the temperature of the refrigerant discharged from the compressor 21 is about 90.degree. Therefore, the water passing through the heating heat exchanger 22 during the boiling operation flows into the first heat storage tank 30 after being heated to about 65° C. by heat exchange with the refrigerant.
  • the high-temperature water that has flowed into the first heat storage tank 30 heats the heat storage material in the second heat storage tank 40 through the wall surface of the first heat storage tank 30 . That is, the first heat storage tank 30 and the second heat storage tank 40 function as heat exchangers.
  • the heat storage amount of the heat storage material provided in the second heat storage tank 40 is small, that is, when the temperature of the heat storage material is low, the heat of the water flowing into the first heat storage tank 30 is A large amount of heat is taken away by the heat storage material of the heat storage tank 40 . Therefore, the temperature of the water that has flowed into the first heat storage tank 30 drops significantly.
  • the temperature of the heat storage material in the second heat storage tank 40 gradually rises.
  • the amount of heat exchanged between the first heat storage tank 30 and the second heat storage tank 40 decreases. Therefore, the water that has flowed into the first heat storage tank 30 is stored in the first heat storage tank 30 while maintaining its high temperature.
  • the heat storage unit 10 high-temperature water is stored in the upper portion and low-temperature water is stored in the lowermost portion by performing the boiling operation. Also, thermal stratification is formed between the top and the bottom. As the boiling operation progresses, the high-temperature water region increases due to an increase in the amount of boiling, and the temperature stratification approaches the bottom. Then, the temperature of the water stored at the bottom rises, and the incoming water temperature of the water flowing into the heating heat exchanger 22 of the heating device 2 gradually rises.
  • the temperature of the water flowing into the first heat storage tank 30 during the boiling operation is lowered by transferring heat to the second heat storage tank 40 .
  • the temperature of the water flowing out of the heat storage unit 10 is lower than the temperature of the water flowing out of the conventional heat storage unit with respect to the amount of heat stored in the heat storage unit 10, so the performance of the heating device 2 is improved. Decrease can be suppressed.
  • Hot water supply operation (hot water supply operation)
  • the hot water supply operation is an operation for sending out water (hot water) at a set hot water supply temperature from the hot water supply pipe 6 in order to use water (hot water) at a desired temperature for showers, baths, wash basins, and the like. be.
  • the opening of the mixing valve 14 is adjusted so that the temperature of the temperature sensor provided downstream of the mixing valve 14 becomes the set hot water supply temperature.
  • the hot water supply pump 12 is driven.
  • the water stored in the first heat storage tank 30 flows out from the upper pipe 33 and flows into the primary flow path of the heat exchanger 13 .
  • the water that has flowed into the primary channel of the heat exchanger 13 exchanges heat with the water flowing through the secondary channel to become low-temperature water or medium-temperature water, and then flows out of the heat exchanger 13 .
  • the water flowing out of the first heat storage tank 30 is heat-exchanged in the heat exchanger 13 to raise the temperature of the water flowing through the secondary flow path to, for example, 40° C. or higher.
  • the water flowing out of the heat exchanger 13 is sucked into the suction side of the hot water supply pump 12, pressurized and sent. Water sent from the hot water supply pump 12 flows into the lower portion of the first heat storage tank 30 through the lower pipe 34 .
  • the water flowing from the water supply pipe 5 is branched within the heat storage tank unit 1 .
  • one branched water flows into the second inlet of the mixing valve 14 via the heat exchanger 13, and the other branched water flows into the secondary flow path of the heat exchanger 13. influx.
  • the water that has flowed into the secondary channel of the heat exchanger 13 exchanges heat with the water flowing through the primary channel to become hot water and flows out of the heat exchanger 13 .
  • Water flowing out of the heat exchanger 13 flows into the first inlet of the mixing valve 14 .
  • the mixing valve 14 the water that has flowed into the first inlet and the water that has flowed into the second inlet are mixed, and the mixed water reaches the set hot water supply temperature and flows out from the outlet.
  • the heat storage state of the heat storage unit 10 during the hot water supply operation (hot water supply operation) will be described.
  • the temperature stratification is formed in the first heat storage tank 30 of the heat storage unit 10 such that the upper portion is about 65° C. and the lower portion is about 10° C., which is the temperature of city water. That is, the temperature of the water in the first heat storage tank 30 decreases from the top to the bottom, and the temperature at the bottom is substantially the same as the temperature of the water entering the heating device 2 at the end of the heat storage operation.
  • the heat of the water stored in the first heat storage tank 30 is sufficiently transferred to the second heat storage tank 40, and the phase of the heat storage material in the second heat storage tank 40 undergoes a liquid phase change 65.
  • °C is assumed to be the initial state of hot water supply.
  • the water flowing out from the upper pipe 33 of the first heat storage tank 30 is approximately 65°C high temperature water, that is, the highest temperature in the heat storage state.
  • the water in the first heat storage tank 30 is pushed up from the bottom to the top. Therefore, the temperature of the water in the upper portion of the first heat storage tank 30 decreases as the hot water supply operation continues.
  • the temperature of the second heat storage tank 40 when the temperature of the water in the upper part of the first heat storage tank 30 decreases and becomes equal to or lower than the temperature of the heat storage material of the second heat storage tank 40, the temperature of the second heat storage tank 40 The heat of the heat storage material is transferred to the water in the first heat storage tank 30 . As a result, the temperature of the water in the upper portion of the first heat storage tank 30 rises. Therefore, in the region of the second step portion 32 of the first heat storage tank 30, heat is replenished from the second heat storage tank 40 as the temperature of the water drops.
  • the first heat storage tank 30 and the second heat storage tank 40 are formed separately. Therefore, even if the first heat storage tank 30 or the second heat storage tank 40 is damaged by corrosion and a hole is formed, the fluids in both tanks will not mix. Therefore, in Embodiment 1, it is possible to prevent the heat storage material of the second heat storage tank 40 from being mixed into the water flowing out of the first heat storage tank 30 .
  • the heat storage unit 10 for storing heat is composed of the first heat storage tank 30 and the second heat storage tank 40, and in addition to heat storage by fluid, water or the like is also used.
  • a latent heat storage material with a higher heat storage density than the fluid is applied. Therefore, the size of the heat storage unit 10 can be reduced when storing the same amount of heat as conventionally.
  • Embodiment 1 since the heat stored in the first heat storage tank 30 is supplied to the second heat storage tank 40, the temperature of the fluid heated by the heat pump, which is the heating device 2, can be lowered. can be done. Therefore, deterioration of the performance of the heat pump can be suppressed, and deterioration of the energy saving performance can be suppressed.
  • the first heat storage tank 30 and the second heat storage tank 40 that constitute the heat storage section 10 are formed separately. Therefore, even if the second heat storage tank 40 is damaged due to corrosion or the like and the heat storage material inside leaks out, the heat storage material can be prevented from being mixed into the fluid in the first heat storage tank 30 . Furthermore, it is possible to prevent the heat storage material from being mixed into the water supply.
  • the heat storage unit 10 is formed by the first heat storage tank 30 and the second heat storage tank 40, and when the heated fluid flows into the first heat storage tank 30, the fluid and the second Heat is exchanged with the heat storage material of the heat storage tank 40 , and heat is stored in the second heat storage tank 40 .
  • the temperature of the fluid stored in the first heat storage tank 30 is lowered, so that the temperature rise of the fluid supplied to the heating device 2 caused by repeating the heat storage operation is suppressed while storing the heat. . Therefore, deterioration of the performance of the heat pump, which is the heating device 2, can be suppressed, and deterioration of the energy saving performance can be suppressed.
  • Embodiment 2 Water heater 100 according to the second embodiment differs from that of the first embodiment in the structure of heat storage unit 10 . It should be noted that, in the second embodiment, the same reference numerals are assigned to the parts that are common to the first embodiment, and detailed description thereof will be omitted.
  • a water heater 100 according to Embodiment 2 is common to Embodiment 1 described above, except for the structure of the heat storage section 10 provided in the heat storage tank unit 1 . Therefore, below, the structure of the heat storage part 10 provided in the heat storage tank unit 1 of the water heater 100 will be described.
  • FIG. 5 is a perspective view showing an example of the structure of the heat storage unit according to the second embodiment.
  • FIG. 6 is a top view showing an example of the structure of the heat storage section according to the second embodiment.
  • FIG. 7 is a BB cross-sectional view of the heat storage unit shown in FIG.
  • the heat storage section 10 is composed of a first heat storage tank 30 and a second heat storage tank 40A formed separately from the first heat storage tank 30.
  • FIGS. 5 the heat storage section 10 is composed of a first heat storage tank 30 and a second heat storage tank 40A formed separately from the first heat storage tank 30.
  • the second heat storage tank 40A is formed so as to cover and abut on the side surface and top surface of the second stepped portion 32 of the first heat storage tank 30 .
  • the outer periphery of the second heat storage tank 40A is formed to have the same dimensions as the outer periphery of the first stepped portion 31 of the first heat storage tank 30, as in the first embodiment.
  • the inner periphery of the second heat storage tank 40A is formed to have the same dimensions as the outer periphery of the second stepped portion 32 of the first heat storage tank 30, as in the first embodiment.
  • a hole 41 penetrating in the height direction (z direction) is formed in the center of the upper surface of the second heat storage tank 40 at a position corresponding to the upper pipe 33 of the first heat storage tank 30 .
  • the upper surface of the second stepped portion 32 is the portion where the heat is most dissipated. Therefore, by being covered with the second heat storage tank 40 in this way, the heat insulation performance is improved compared with the conventional one, and the heat dissipation of the stored heat can be suppressed.
  • FIG. 8 is a BB cross-sectional view of a modification of the heat storage unit shown in FIG.
  • the upper surface of the second stepped portion 32B in the first heat storage tank 30 is tapered from the center of the upper surface.
  • the inner periphery of the upper surface of the second heat storage tank 40B is tapered along the upper surface of the second step portion 32B of the first heat storage tank 30 .
  • These tapered shapes are formed so as to be inclined by about 5° with respect to the width direction (x direction) and the depth direction (y direction).
  • the latent heat storage material in the second heat storage tank 40 undergoes a phase change from the upper side when heat is exchanged with water flowing into the first heat storage tank 30 . Therefore, the contact surfaces of the upper surfaces of the first heat storage tank 30 and the second heat storage tank 40 are formed in a tapered shape, so that the stress generated in the tanks can be alleviated.
  • the first heat storage tank 30 is covered with the second heat storage tank 40 not only on the side surface of the second stepped portion 32 but also on the top surface. ing.
  • the heat insulation performance of the upper surface of the second stepped portion 32, where the heat is most dissipated, is improved, so that the heat dissipation of the accumulated heat can be suppressed.
  • the present disclosure is not limited to the first and second embodiments described above, and various modifications and applications are possible without departing from the gist of the present disclosure.
  • the second heat storage tank 40 is desirably arranged so as to cover the upper portion of the first heat storage tank 30, but is not limited to this, and may be arranged in the middle or lower portion of the first heat storage tank 30. good too.
  • the fluid in the first heat storage tank 30 is thermally stratified so that the upper part is hot and the lower part is cold. Moreover, since the fluid in the upper part of the first heat storage tank 30 is supplied to the heat exchanger 13 during hot water supply, it is desirable to supply the heat of the second heat storage tank 40 to the upper part of the first heat storage tank 30. .
  • the present invention is not limited to this, and any material having a melting point near the heat storage temperature can be used.
  • other latent heat storage materials may be applied.
  • the heat storage material is not limited to the latent heat storage material, and a sensible heat storage material may be applied. In this case, if the fluid in the first heat storage tank 30 is at a temperature at which the heat storage density is high, the same effect can be obtained.
  • the heat storage section 10 has been described as being formed in a rectangular parallelepiped shape, it is not limited to this, and may be formed in a cylindrical shape, for example.
  • the above-described effects can be obtained, and although the degree of freedom in the installation space of the heat storage unit 10 is reduced, the pressure resistance performance can be improved. can be done.
  • the first heat storage tank 30 and the second heat storage tank 40 are made of stainless steel, but this is not limited to this example.
  • the first heat storage tank 30 and the second heat storage tank 40 may be made of a material other than stainless steel as long as the material does not corrode with the heat storage material inside. Examples of materials that are not corroded by the heat storage material include iron, nickel-chromium alloys, and resins. However, it is desirable that the portion where the first heat storage tank 30 and the second heat storage tank 40 are in contact with each other be made of a material with high thermal conductivity.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000121158A (ja) * 1998-10-20 2000-04-28 Sekisui Chem Co Ltd 貯湯型電気温水器
JP2006084090A (ja) * 2004-09-15 2006-03-30 Matsushita Electric Ind Co Ltd ヒートポンプ蓄熱装置
JP2011007418A (ja) * 2009-06-25 2011-01-13 Sumitomo Electric Ind Ltd ヒートポンプ暖房・給湯機
JP2012180993A (ja) * 2011-03-02 2012-09-20 Yazaki Corp 潜熱蓄熱貯湯槽及び給湯装置
JP2013024529A (ja) * 2011-07-26 2013-02-04 Dainichi Co Ltd 蓄熱給湯装置
JP2016205725A (ja) * 2015-04-24 2016-12-08 株式会社ガスター 貯湯ユニット
JP2019190668A (ja) * 2018-04-18 2019-10-31 パナソニックＩｐマネジメント株式会社 蓄熱式温水装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19807657C1 (de) 1998-02-24 1999-07-01 Ivt Installations Und Verbindu Wärmespeicher
JP2006284070A (ja) 2005-03-31 2006-10-19 Daiwa House Ind Co Ltd 貯湯装置
EP2204618A3 (de) 2009-01-02 2012-06-06 Vaillant GmbH Heiz- oder Brauchwasserwärmespeicher
GB2494181A (en) 2011-09-02 2013-03-06 Dublin Inst Of Technology Modular phase change material system for fitting to a hot water cylinder
JP6994190B2 (ja) 2017-07-13 2022-01-14 国立研究開発法人宇宙航空研究開発機構 インサート装置、インサート装置が埋設されたサンドイッチパネル、蓄熱ユニット
JP7293848B2 (ja) 2019-05-08 2023-06-20 株式会社アイシン コージェネレーションシステム

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000121158A (ja) * 1998-10-20 2000-04-28 Sekisui Chem Co Ltd 貯湯型電気温水器
JP2006084090A (ja) * 2004-09-15 2006-03-30 Matsushita Electric Ind Co Ltd ヒートポンプ蓄熱装置
JP2011007418A (ja) * 2009-06-25 2011-01-13 Sumitomo Electric Ind Ltd ヒートポンプ暖房・給湯機
JP2012180993A (ja) * 2011-03-02 2012-09-20 Yazaki Corp 潜熱蓄熱貯湯槽及び給湯装置
JP2013024529A (ja) * 2011-07-26 2013-02-04 Dainichi Co Ltd 蓄熱給湯装置
JP2016205725A (ja) * 2015-04-24 2016-12-08 株式会社ガスター 貯湯ユニット
JP2019190668A (ja) * 2018-04-18 2019-10-31 パナソニックＩｐマネジメント株式会社 蓄熱式温水装置

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