JP2013088049A - Latent heat storage tank and hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hygienic latent heat storage tank configured to effectively utilize a latent heat storage material, and to provide a hot water supply system including the latent heat storage tank.SOLUTION: The latent heat storage tank includes a latent heat storage material, heat exchange sheets embedded in the latent heat storage material, and a container for storing the heat exchange sheets and the latent heat storage material. The heat exchange sheet includes a sheet-like base material, and a heat medium flow tube disposed in a groove provided in the base material and allowing a heat medium to flow through. The hot water supply system includes the latent heat storage tank.

Description

  The present invention relates to a latent heat storage tank and a hot water supply system including the latent heat storage tank.

  In recent years, various technologies using exhaust heat or solar heat have been proposed for effective use of energy. For example, when heat such as exhaust heat or solar heat is used for applications such as hot water supply, a technique for storing and using the heat in the latent heat storage material has been implemented.

  For example, Patent Document 1 discloses a hot water storage tank in which the surface of a hot water tank is wrapped with a latent heat storage material and the outside thereof is wrapped with a heat insulating material. Patent Document 2 discloses a hot water storage device in which a latent heat storage material for storing the heat of hot water inside is provided in a hot water storage tank, and the hot water storage tank includes the latent heat storage material and is covered with a heat insulating material. Is disclosed. Patent Document 3 discloses an electric water heater provided with a heater for heating supplied water in a tank, and the tank includes a synthetic resin having a number of grooves on the surface and enclosing a latent heat storage material. An electric water heater is disclosed in which a large number of capsules made of plastic are incorporated. Further, in Patent Document 4, in a hot water storage type water heater that heats water supplied in a tank by a heating means, a heat storage means in which a heat storage material is accommodated in a case is provided in the tank. A water heater is disclosed.

JP 59-056046 A JP 2006-284070 A Japanese Patent Laid-Open No. 60-048443 JP-A-4-366361

  In the inventions described in Patent Documents 1 and 2, the outside of the hot water storage tank in which hot water is stored is covered with the latent heat storage material. According to these techniques, when heat is stored in the latent heat storage material, it takes time until the heat is transmitted to the entire latent heat storage material. That is, heat can be stored because the heat is transmitted to the portion in contact with the hot water storage tank and the vicinity thereof in the latent heat storage material, but the heat is not easily transmitted to the portion away from the hot water storage tank, so the heat cannot be stored in that portion, or the heat storage takes time. Therefore, there was a problem that the latent heat storage material could not be used effectively.

Patent Documents 3 and 4 disclose a heat storage structure in which a latent heat storage material is injected into a sealed container and the sealed container is installed in a hot water storage tank. In these technologies, there is a risk that the sealed container may be damaged due to repeated pressure changes from the inside of the sealed container due to the state change of the latent heat storage material (repetition of transformation from liquid to solid and transformation from solid to liquid). is there. When the sealed container into which the latent heat storage material is injected is damaged, the latent heat storage material is mixed into the hot water storage tank, which is problematic in terms of hygiene.
Also, when hot water in the hot water storage tank is used while heat is stored in the latent heat storage material, the hot water temperature in the hot water storage tank decreases because the water level is lowered to the specified level and water is supplied into the hot water storage tank at the same time. Easy to do. Therefore, there was also a problem that the latent heat storage material could not store heat efficiently.

  Then, this invention makes it a subject to provide the hot water supply system provided with the latent heat storage tank which can utilize a latent heat storage material effectively, and was excellent in hygiene, and this latent heat storage tank.

  The present invention will be described below.

  A first aspect of the present invention includes a latent heat storage material, a heat exchange sheet embedded in the latent heat storage material, and a container that accommodates the heat exchange sheet and the latent heat storage material, and the heat exchange sheet is in the form of a sheet. A latent heat storage tank provided with a base material and a heat medium flow pipe disposed in a groove provided in the base material and capable of circulating a heat medium.

  In the latent heat storage tank according to the first aspect of the present invention, the heat exchange sheet is wound in a spiral shape so that the interval in the normal direction of the sheet surface is 30 mm or more and 80 m or less. Or a plurality of them in parallel.

  Moreover, in the latent heat storage tank according to the first aspect of the present invention, the heat medium flow pipe includes a plurality of straight portions arranged in a straight line and a curved portion connecting the straight portions, and is adjacent to each other. It is preferable that the tube axis | shaft space | interval of linear parts is 40 mm or more and 100 mm or less.

  The second aspect of the present invention includes the latent heat storage tank and the heat source of the first aspect, and the heat medium flowing through the heat medium flow pipe can receive heat from the heat source, and the heat medium flow pipe However, the hot water supply system is connected to a supply pipe capable of supplying a heat medium into the latent heat storage tank and a discharge pipe capable of discharging the heat medium outside the latent heat storage tank.

  Here, “the heat medium flowing through the heat medium flow tube can receive heat from the heat source” is not limited to a form in which the heat medium flowing through the heat medium flow tube can directly obtain heat from the heat source. It is a concept including a form in which the heat medium flowing through the medium distribution pipe can indirectly obtain heat from the heat source via another member. Further, “the heat medium flow pipe is connected to a supply pipe capable of supplying the heat medium into the latent heat storage tank and a discharge pipe capable of discharging the heat medium outside the latent heat storage tank” However, the present invention is not limited to the form directly connected to the supply pipe capable of supplying the heat medium from outside the system into the latent heat storage tank and the discharge pipe capable of discharging the heat medium from the latent heat storage tank to the outside of the system. It is also a concept that includes a form in which the connection is indirectly made through the like. Note that “outside the system” means other than the latent heat storage tank, the heat source, and the piping connecting them.

  According to the present invention, the latent heat storage material can be effectively used, and the latent heat storage material can be effectively used by providing the latent heat storage tank with excellent hygiene and the latent heat storage tank. It is possible to provide a hot water supply system that is hygienic and excellent.

1 is a diagram schematically showing a configuration of a hot water supply system 100. FIG. 1 is a view schematically showing a cross section of a latent heat storage tank 10. FIG. It is a top view which shows the heat exchange sheet | seat 12 roughly. It is a figure which shows roughly a part of thickness direction cross section of the heat exchange sheet. It is sectional drawing which shows schematically the other example of a latent heat storage tank.

  The above-described operation and gain of the present invention will be clarified from embodiments for carrying out the invention described below. Hereinafter, the present invention will be described based on embodiments shown in the drawings. However, the present invention is not limited to these embodiments. Each drawing is simplified for convenience of illustration and easy understanding. Moreover, in each drawing, the same code | symbol is attached | subjected to the thing of the same structure, and the code | symbol which becomes repeated may be abbreviate | omitted partially.

  FIG. 1 is a diagram schematically showing a configuration of a hot water supply system 100. As shown in FIG. 1, the hot water supply system 100 includes a latent heat storage tank 10, a heat source 20, a heat exchanger 30, piping connecting these, and the like.

  The hot water supply system 100 can store heat from the heat source 20 in the latent heat storage tank 10 and dissipate heat when necessary. Hereinafter, a method for using the hot water supply system 100 will be described while explaining the components provided in the hot water supply system 100.

  The heat source 20 can generate heat transmitted to the latent heat storage tank 10 through a heat medium or the like. As the heat source 20, for example, a solar heat collector can be used. In the following description of the hot water supply system 100, a mode in which a solar heat collector is used as the heat source 20 will be described.

  As the solar heat collector 20, a known solar heat collector can be used. That is, the solar heat collector 20 is provided with a pipe through which a heat medium flows, and has a configuration capable of applying solar heat to the heat medium flowing through the pipe.

  The heat medium that has obtained heat in the solar heat collector 20 is sent to the heat exchanger 30 through the pipe 21. On the other hand, a heat medium is sent from the latent heat storage tank 10 to the heat exchanger 30 through the pipe 32. And in the heat exchanger 30, heat exchange is performed between the heat medium sent from the solar heat collector 20 side and the heat medium sent from the latent heat storage tank 10 side. The heat exchanger 30 is not particularly limited as long as it can perform heat exchange as described above, and a known heat exchanger can be used.

  The heat medium sent to the heat exchanger 30 from the solar heat collector 20 side and having exchanged heat in the heat exchanger 30 is returned to the solar heat collector 20 through the pipe 22. Thereafter, the heat medium again obtains heat in the solar heat collector 20. The piping 22 is provided with a circulation pump 24, and the heat medium can be circulated between the solar heat collector 20 and the heat exchanger 30 by the circulation pump 24 as described above. The circulation pump 24 is not particularly limited as long as it can withstand the use environment, and a known pump can be used. Moreover, in order to absorb the volume change (expansion and shrinkage) of the heat medium caused by the temperature change of the heat medium, it is preferable that a reserve tank 23 is provided in the pipe 22.

  On the other hand, the heat medium sent from the latent heat storage tank 10 side to the heat exchanger 30 and subjected to heat exchange in the heat exchanger 30 is returned to the latent heat storage tank 10 through the pipe 31. Thereafter, the heat medium transfers heat to the latent heat storage material 11 (see FIG. 2) in the latent heat storage tank 10 as described later. A circulation pump 34 is provided in the pipe 31, and the heat medium can be circulated between the latent heat storage tank 10 and the heat exchanger 30 by the circulation pump 34 as described above. The circulation pump 34 is not particularly limited as long as it can withstand the use environment, and a known pump can be used. Moreover, in order to absorb the volume change (expansion and shrinkage) of the heat medium caused by the temperature change of the heat medium, it is preferable that a reserve tank 33 is provided in the pipe 31.

  Further, a pipe 37 (hereinafter referred to as “supply pipe 37”) is connected to the pipe 31 via a three-way valve 35, and a pipe 38 (hereinafter referred to as “discharge pipe 38” is connected to the pipe 32 via a three-way valve 36. ") Is connected. By providing the supply pipe 37, the discharge pipe 38, and the three-way valves 35 and 36 in this way, as described below, there is a process of storing heat in the latent heat storage tank 10 (hereinafter referred to as “heat storage process”). ) And a process of releasing the heat stored in the latent heat storage tank 10 (hereinafter, also referred to as “heat dissipation process”) can be switched.

  In the heat storage step, the heat medium is circulated between the latent heat storage tank 10 and the heat exchanger 30 by closing the supply pipe 37 side in the three-way valve 35 and closing the discharge pipe 38 side in the three-way valve 36. it can. By circulating the heat medium between the latent heat storage tank 10 and the heat exchanger 30, the heat medium obtained by the heat exchanger 30 as described above is caused to flow into the latent heat storage tank 10 through the pipe 31, The heat of the heat medium can be applied to the latent heat storage material 11 in the latent heat storage tank 10. The heat medium that has given heat to the latent heat storage material 11 is sent to the heat exchanger 30 through the pipe 32 to obtain heat again. By repeating such a process, the heat obtained by the solar heat collector 20 can be transmitted to the latent heat storage tank 10 and stored.

  On the other hand, in the heat dissipation process, the heat exchanger 30 side is closed in the three-way valve 35 and the heat exchanger 30 side is closed in the three-way valve 36, thereby supplying the heat medium from the supply pipe 37 to the latent heat storage tank 10, and thereafter The heat medium that has circulated through the latent heat storage tank 10 can be discharged from the latent heat storage tank 10 through the discharge pipe 38. The latent heat storage tank 10 stores heat in the heat storage step, and the heat medium supplied from the supply pipe 37 circulates in the latent heat storage tank 10, whereby the heat medium can obtain heat in the latent heat storage tank 10. it can. The heat medium that has obtained heat in the latent heat storage tank 10 is discharged from the latent heat storage tank 10 through the discharge pipe 38. By repeating such a process, the heat medium that has obtained the heat stored in the latent heat storage tank 10 can be used. That is, when water is used as the heat medium, the water supplied from the supply pipe 37 flows through the latent heat storage tank 10 to become hot water, and the hot water discharged from the discharge pipe 38 can be used. In the hot water supply system 100, it is preferable that a mixing valve 39 is provided between the supply pipe 37 and the discharge pipe 38 so that the heat medium flowing through both pipes can join. It becomes easy to adjust the temperature of the hot water provided to the user of the hot water supply system 100.

  Next, the configuration of the latent heat storage tank 10 will be described in detail. The latent heat storage tank 10 stores the heat obtained from the solar heat collector 20 as described above by the latent heat storage material 11 (see FIG. 2) provided therein. A specific configuration example will be described with reference to FIG. FIG. 2 is a diagram schematically showing a cross section of the latent heat storage tank 10.

  As shown in FIG. 2, the latent heat storage tank 10 includes a latent heat storage material 11, a heat exchange sheet 12 embedded in the latent heat storage material 11, and a container 13 that houses the heat exchange sheet 12 and the latent heat storage material 11. It has.

As the latent heat storage material 11, a known latent heat storage material can be used. As the latent heat storage material 11 used as the latent heat storage material 11, an appropriate one can be selected according to the necessary amount of heat derived by design. For example, latent heat of inorganic hydrate salts such as sodium acetate trihydrate, calcium chloride hexahydrate, sodium sulfate decahydrate, sodium thiosulfate pentahydrate, and organic compounds such as n-tetradecane and n-octadecane It can be used as the heat storage material 11. By using such a latent heat storage material, a large amount of heat can be stored in a small volume. For example, under the following conditions, when sodium acetate trihydrate is used as a latent heat storage material, heat storage of about 1.8 times is possible compared to a wet tank that uses water as the latent heat storage material.
(Comparison condition)
-Tank capacity: 250L
・ Heat storage temperature: 90 ℃
・ Temperature used: 35 ℃ (temperature difference: 55 ℃)
(Physical properties of sodium acetate trihydrate)
Melting point: 42 ° C (solidification temperature: 39.5 ° C)
・ Heat storage amount: 164kJ / kg (35 ℃ → 45 ℃)
Specific heat: 3.15 J / gK
Density: 1370 kg / m ³

  In addition, a heat insulating material 15 is preferably provided between the latent heat storage material 11 and the container 13. By disposing the heat insulating material 15 between the latent heat storage material 11 and the container 13, the heat stored in the latent heat storage material 11 can be prevented from being released to the outside of the container 13. As the heat insulating material 15, a known heat insulating material can be used without particular limitation as long as it can withstand the use environment of the latent heat storage tank 10.

  Next, the heat exchange sheet 12 will be described in detail. The heat exchange sheet 12 can exchange heat with the latent heat storage material 11. More specifically, as will be described later, heat can be transferred between the heat medium flowing through the heat medium flow pipe 2 (see FIG. 3) provided in the heat exchange sheet 12 and the latent heat storage material 11. is there.

  The heat exchange sheet 12 is disposed in the latent heat storage material 11 as shown in FIG. More specifically, the heat exchange sheet 12 is wound spirally in the latent heat storage material 11 so that the interval w1 in the normal direction of the sheet surface is a predetermined interval. The interval w1 is preferably 30 mm or more and 80 mm or less, more preferably 35 mm or more and 70 mm or less, and more preferably 40 mm or more and 60 mm or less. In order to install the heat exchange sheet 12 with an interval as described above, it is preferable to use a spacer 14 as shown in FIG. By using the spacer 14, the interval w1 of the heat exchange sheet 12 can be easily maintained. What is used as the spacer 14 is not particularly limited as long as it can withstand the use environment of the latent heat storage tank 10.

  As described above, in the conventional latent heat storage tank as disclosed in Patent Documents 1 and 2, heat is transmitted only to a portion near the heat source (hot water storage tank) of the latent heat storage material, and in a portion away from the heat source. Because it was difficult to transmit heat, the latent heat storage material could not be used effectively. In addition, if the time for heating the latent heat storage material is lengthened, the heat is transmitted to the part of the latent heat storage material that is away from the heat source, but the latent heat storage material cannot be used efficiently due to the time required for heat storage. It was.

  According to the latent heat storage tank 10, the heat exchange sheet 12 is arranged at a predetermined interval in the latent heat storage material 11 as described above, so that heat is easily transmitted uniformly to the entire latent heat storage material 11, and the time is shortened. Thus, heat can be applied to the entire latent heat storage material 11. Therefore, the latent heat storage material 11 can be utilized efficiently. If the interval w1 is too wide, it takes time for the heat to be transmitted to the latent heat storage material 11 sandwiched between the heat exchange sheets 12 (to store heat), resulting in poor efficiency. Moreover, since the big heat exchange sheet | seat 12 will be needed when the said space | interval w1 is too narrow, the manufacturing cost of the latent heat storage tank 10 becomes high. Moreover, when the big heat exchange sheet | seat 12 is used, the volume of the latent heat storage material 11 in the latent heat storage tank 10 will decrease.

  The size of the heat exchange sheet 12 can be appropriately determined according to the size of the container 13 that houses the heat exchange sheet 12, the configuration and installation method of the heat exchange sheet 12, and the like.

  A specific configuration example of the heat exchange sheet 12 will be described with reference to FIGS. 3 and 4. FIG. 3 is a plan view schematically showing the heat exchange sheet 12 in an unfolded state (not wound). FIG. 4 is a view schematically showing a part of the cross section in the thickness direction of the heat exchange sheet 12. In FIG. 3, the soaking sheet 4 and the U-shaped member 6 described later are omitted.

  The heat exchange sheet 12 shown in FIGS. 3 and 4 includes a sheet-like base material 1 and a heat medium circulation pipe 2 that is disposed in the groove 3 provided in the base material 1 and that can circulate the heat medium. I have. Further, soaking sheets 4 and 5 are provided on both surfaces of the substrate 1. Further, a U-shaped member 6 having a substantially U-shaped cross section is disposed in at least a part of the groove 3. These configurations will be described below.

  The base material 1 is preferably made of a material having low thermal conductivity. The substrate 1 is made of, for example, a foamable resin. By configuring the base material 1 with a material having low thermal conductivity, it is possible to suppress the base material 1 from taking away heat to be transferred between the heat medium flowing through the heat medium flow pipe 2 and the latent heat storage material 11. . Moreover, weight reduction of the base material 1 can be aimed at by comprising the base material 1 with a foamable resin etc. Specific examples of the expandable resin that can be used in the present invention include expanded polypropylene, expanded polystyrene, expanded polyethylene, and expanded polyurethane. When a foamable resin is used for the substrate 1, the expansion ratio is not particularly limited, but is preferably 5 to 50 times, more preferably 10 to 30 times, and more preferably 15 to 20 times. When the expansion ratio is high, the heat insulation is improved, but when the expansion ratio is too high, the strength is lowered.

  Although the thickness t1 of the base material 1 is not specifically limited, 5 mm or more and 12 mm or less are preferable, 5 mm or more and 11 mm or less are more preferable, and 5 mm or more and 9 mm or less are more preferable. If the base material 1 is too thin, it will be difficult to ensure the depth of the groove 3 for arranging the heat medium flow pipe 2 described later. Moreover, since the volume which the heat exchange sheet 12 occupies in the container 13 will become large if the base material 1 is too thick, the quantity of the latent heat storage material 11 which can be filled in the container 13 decreases.

  The groove 3 is a groove for disposing the heat medium flow pipe 2, and the shape and the like are not particularly limited as long as the heat medium flow pipe 2 can be disposed. The depth of the groove 2 can be appropriately changed according to the outer diameter of the heat medium flow pipe 2 disposed therein. The groove 3 illustrated in FIG. 4 is formed so as to penetrate in the thickness direction of the substrate 1. Thus, by making the groove | channel 3 the groove | channel penetrated in the thickness direction of the base material 1, the thickness of the base material 1 and the depth of the groove | channel 3 become the same. Therefore, it becomes easy to make the base material 1 thin while disposing the thick heat medium flow pipe 2 in the groove 3. Therefore, it is easy to make the heat exchange sheet 12 thin while allowing the heat exchange sheet 12 to sufficiently function as a heat exchanger. Further, by disposing the heat medium flow pipe 2 in the groove 3 penetrating in the thickness direction of the base material 1, the heat of the heat medium flowing through the heat medium flow pipe 2 from both surfaces of the heat exchange sheet 12 is transferred to the latent heat storage material 11. It becomes easy to convey to. However, this invention is not limited to the said form, In order to arrange | position a heat-medium distribution pipe | tube in a heat exchange sheet, the groove | channel was formed in the one surface side of a base material (it does not penetrate). It may be.

  Further, as shown in FIG. 3, the groove 3 includes a plurality of linear portions 3a arranged in a substantially linear shape in a plan view, and is formed in a curved shape in a plan view so as to connect the linear portions 3a. 3b. That is, the heat medium flow pipe 2 includes a plurality of straight portions 2a arranged in a straight line and a curved portion 2b that connects the straight portions 2a. The tube axis interval d1 between the adjacent straight portions 2a is preferably 40 mm or more and 100 mm or less, more preferably 50 mm or more and 90 mm or less, and more preferably 60 mm or more and 80 mm or less. If the distance d1 is too small, the entire length of the heat medium flow pipe 2 becomes long, and the pressure loss of the heat medium flowing in the heat medium flow pipe 2 becomes high, so that the heat efficiency is deteriorated. If the distance d1 is too large, the efficiency of heat transfer between the heat medium flowing through the heat medium flow pipe 2 and the latent heat storage material 11 is deteriorated.

  In addition, as shown in FIG. 4, it is preferable that a U-shaped member 6 having a substantially U-shaped cross section is disposed in at least a part of the linear portion 3 a in the groove 3. The U-shaped member 6 includes a U-shaped portion 6a formed in a U-shape, and fixing pieces 6b and 6b formed so as to be separated from the opening side end of the U-shaped portion 6a. The U-shaped part 6 a is fitted in the groove 3, and the fixing pieces 6 b and 6 b are fixed to the base material 1. By using such a U-shaped member 6, the heat medium flow pipe 2 can be easily fixed to the groove 3 through the U-shaped member 6. The U-shaped portion 6 a of the U-shaped member 6 is formed so as to be in contact with a part of the heat medium flow pipe 2, and the heat of the heat medium flowing through the heat medium flow pipe 2 through the U-shaped member 6 is equalized. It can be transmitted to the thermal sheets 4, 5 and the like. From the viewpoint of facilitating the transfer of the heat of the heat medium flowing through the heat medium flow pipe 2 through the U-shaped member 6 to the soaking sheets 4, 5, etc., the U-shaped member 6 is a material having a high thermal conductivity. It is preferable that it is comprised. A specific example of the material constituting the U-shaped member 6 is aluminum.

  The heat medium flow pipe 2 is a pipe for flowing a heat medium (hot water or cold water, etc.), can flow the heat medium, and can be disposed in the groove 3 formed in the base material 1. There is no particular limitation as long as it can withstand the environment when the heat exchange sheet 12 is used. Specific examples of the heat medium flow pipe 2 include resin pipes such as crosslinked polyethylene and polybutene. In addition, when a flexible pipe such as a resin pipe is used as the heat medium flow pipe 2, a pipe having an outer diameter slightly larger than the depth of the groove 3 can be used. The outer diameter of the heat medium flow pipe 2 is not particularly limited, but is preferably 80% or more and 110% or less, more preferably 90% or more and 105% or less, and further preferably 95% or more and 100% or less with respect to the depth of the groove 3. . If it is this range, the heat-medium distribution pipe 2 which has a softness | flexibility will fit moderately in the groove | channel 3 currently formed in the base material 1, and the heat-medium distribution pipe 2 can be fixed to the groove | channel 3.

  One end 2 c of the heat medium flow pipe 2 is directly or indirectly connected to the pipe 31, and the other end 2 d is directly or indirectly connected to the pipe 32. By connecting the heat medium flow pipe 2 to the pipes 31 and 32 in this way, the heat medium flow pipe 2 exchanges heat for transferring heat from the solar heat collector 20 to the latent heat storage material 11 in the heat storage process. It functions as a tube, and functions as a heat exchange tube for transmitting heat stored in the latent heat storage material 11 to the heat medium supplied to the heat medium flow tube 2 from the outside in the heat dissipation process. That is, in the heat storage process, as can be seen from FIGS. 1 to 3, the heat collected by the solar heat collector 20 is given to the heat medium flowing to the latent heat storage tank 10 in the heat exchanger 30, and the heat medium is heated. The heat medium circulation pipe 2 in the exchange sheet 12 is circulated. At this time, heat is transmitted from the heat medium flowing through the heat medium flow pipe 2 to the latent heat storage material 11, and heat can be stored by the latent heat storage material 11. In the heat dissipation process, the heat medium supplied from the supply pipe 37 flows into the heat medium flow pipe 2 in the heat exchange sheet 12 in the latent heat storage tank 10 via the three-way valve 35 and the pipe 31, and the heat medium Therefore, heat is obtained from the latent heat storage material 11. Thereafter, the heat medium that has obtained heat from the latent heat storage material 11 is discharged through the pipe 32, the three-way valve 36, and the discharge pipe 38, and is provided to the user of the latent heat storage tank 10.

  The number of heat exchange sheets 12 provided in the latent heat storage tank 10 is not particularly limited, and a plurality of heat exchange sheets 12 may be provided. When a plurality of heat exchange sheets 12 are provided, it is preferable to connect the heat medium flow pipes 2 provided in the plurality of heat exchange sheets 12 in series. In this way, the heat medium flow pipe 2 connected in series to form a continuous pipe is supplied with the heat medium from one end 2c and discharged from the other end 2d. In addition, the pipes 31 and 32 can be connected. However, the heat exchange sheet 12 may have a plurality of heat medium flow pipes, and when a plurality of heat exchange sheets 12 are provided, the heat medium flow pipes 2 may be provided in parallel. When there are a plurality of heat medium flow pipes, the end portions of the heat medium flow pipes may be combined with a header or the like and connected to the pipes 31 and 32.

  As described above, in the conventional latent heat storage tanks disclosed in Patent Documents 3 and 4, latent heat storage is performed in a hot water storage tank in which hot water (heat medium) provided to the user of the latent heat storage tank is stored. There was a problem in terms of hygiene because the materials were placed. On the other hand, according to the latent heat storage tank 10, the heat medium provided to the user of the latent heat storage tank 10 circulates in the heat medium flow pipe 2 provided in the heat exchange sheet 12, and the latent heat storage in the heat medium. It is easy to prevent the situation where the material 11 is mixed, and it is excellent in hygiene. Moreover, since the heat of the latent heat storage material 11 can be transmitted to the heat medium flowing in the heat medium flow pipe 2 that has passed through the latent heat storage material 11, the amount of heat of the latent heat storage material 11 can be used efficiently. Furthermore, since the latent heat storage tank 10 is a dry type that does not require a hot water storage tank, the cost of safety measures such as a pressure relief valve can be reduced.

  Next, the soaking sheets 4 and 5 will be described. The soaking sheets 4 and 5 are disposed on the surface of the substrate 1. When the groove 3 penetrates in the thickness direction of the substrate 1 as described above by disposing the groove 3 so as to cover at least a part of the groove 3 with the soaking sheets 4, 5, heat is generated from the groove 3. It becomes easy to prevent the medium flow pipe 2 from coming off. However, the soaking sheets 4 and 5 are preferably disposed on the entire surface of the substrate 1. By setting it as this form, it becomes easy to transmit efficiently the heat of the heat medium which distribute | circulates the heat-medium distribution pipe | tube 2 to the latent heat storage material 11. FIG. Soaking sheets 4 and 5 are not particularly limited as long as they are sheet-like members having high thermal conductivity. Specific examples of the soaking sheets 4 and 5 include metal foils made of aluminum or copper. Although the method of arrange | positioning the soaking | uniform-heating sheets 4 and 5 on the surface of the base material 1 is not specifically limited, For example, bonding to the base material 1 using a well-known adhesive agent is considered. The soaking sheets 4 and 5 may be composed of a single layer or multiple layers, but from the viewpoint of improving heat conduction, the soaking sheets 4 and 5 are composed of a single layer. Preferably it is. The thickness of the soaking sheets 4 and 5 is not particularly limited. For example, when a single-layer aluminum foil is used as the soaking sheet 4, it is preferably 10 μm or more and 200 μm or less, more preferably 20 μm or more and 150 μm or less, and 30 μm or more and 100 μm. The following is more preferable. If it is this range, the soaking | uniform-heating sheets 4 and 5 can ensure favorable thermal conductivity, and will have moderate intensity | strength, and the sticking operation | work to the base material 1 will become easy.

  The heat exchange sheet 12 is preferably laminated as a whole. By laminating the heat exchange sheet 12, corrosion of the soaking sheets 4 and 5 attached to the surface of the substrate 1 can be prevented. Therefore, the heat exchange sheet 12 can be a heat exchange sheet with better long-term performance. The method for laminating is not particularly limited, and can be performed by a known method. Examples of the film used for laminating include a resin film made of polypropylene (PP) or polyethylene (PE).

In the description so far, the latent heat storage tank has a cylindrical shape, and the heat exchange sheet wound in a spiral shape in the latent heat storage tank has been illustrated and described as an example. The invention is not limited to such a form. The shape of the latent heat storage tank is not limited to a cylindrical shape, and may be other shapes. Moreover, the heat exchange sheet should just be embed | buried by the predetermined space | interval as mentioned above in the latent heat storage material, and is not limited to the form wound by the spiral shape illustrated in FIG. FIG. 5 is a cross-sectional view schematically showing another embodiment of the latent heat storage tank, and corresponds to FIG.

  FIG. 5A illustrates a form in which a plurality of heat exchange sheets are arranged in parallel in parallel. The latent heat storage tank 10a shown in FIG. 5A is the same as the latent heat storage tank 10 described above except for the container 13a and the heat exchange sheet 12a. The container 13a is a rectangular parallelepiped container. A plurality of heat exchange sheets 12a are provided, and these are arranged in layers so that the interval w2 in the normal direction of the sheet surface is a predetermined interval. The heat exchange sheet 12a is the same as the heat exchange sheet 12 except for the size and arrangement method. Moreover, the preferable range of the space | interval w2 is made into the same range for the reason similar to the space | interval w1 mentioned above.

  FIG.5 (b) has illustrated the form which bent and arrange | positioned the heat exchange sheet | seat. The latent heat storage tank 10b shown in FIG. 5B is the same as the latent heat storage tank 10a described above except for the heat exchange sheet 12b. The heat exchange sheets 12b are arranged in layers so that the interval w3 in the normal direction of the sheet surface is a predetermined interval. Here, the interval w3 in the normal direction of the sheet surface means an interval between opposing surfaces arranged in parallel when folded as shown in FIG. 5 (b). Further, the preferable range of the interval w3 is the same range for the same reason as the interval w1 described above.

  The method for installing the heat exchange sheet is not particularly limited as described above, but it is preferably installed in a spiral shape when the shape of the latent heat storage tank is cylindrical, and in the case of a rectangular parallelepiped, it is preferably installed in layers. . By setting it as these forms, it becomes easy to transmit heat uniformly to the latent heat storage material in a latent heat storage tank.

  Moreover, in the description so far, although the form which transmits the heat | fever from a heat source (solar heat collector) to the heat medium which distribute | circulates the inside of a latent-heat storage tank via a heat exchanger was illustrated and demonstrated, this invention is this form It is not limited to. The heat medium which distribute | circulates the heat medium which distribute | circulates the inside of a latent heat storage tank to a heat source may be the form which the said heat medium obtains heat from a heat source directly. Moreover, although the description so far illustrated and demonstrated the form whose heat source is a solar heat collector, this invention is not limited to this form. A heat source will not be specifically limited if it is an apparatus which can give heat to the heat medium which distribute | circulates the inside of a latent-heat storage tank directly or indirectly.

  Moreover, in the description so far, the pipe | tube (heat-medium circulation pipe | tube 2) through which the heat medium which conveys the heat | fever from a heat source to a latent heat storage material distributes the heat stored in the latent heat storage material, and the user of a latent heat storage tank However, the present invention is not limited to this embodiment. However, the present invention is not limited to this embodiment. The pipes through which the heat medium that conveys the heat from the heat source to the latent heat storage material circulates and the pipes through which the heat medium that obtains the heat stored in the latent heat storage material and is provided to the user of the latent heat storage tank circulate May be provided.

DESCRIPTION OF SYMBOLS 1 Base material 2 Heat medium distribution pipe 3 Groove 3a Straight line part 3b Curved part 4, 5 Soaking sheet 6 U-shaped member 6a U-shaped part 6b Fixed piece 10 Latent heat storage tank 11 Latent heat storage material 12 Heat exchange sheet 13 Container 14 Spacer 15 Heat insulation material 20 Heat source (solar heat collector)
21, 22, 31, 32, 37, 38 Piping 23, 33 Reserve tank 24, 34 Pump 35, 36 Three-way valve

Claims (4)

A latent heat storage material, a heat exchange sheet embedded in the latent heat storage material, and a container for housing the heat exchange sheet and the latent heat storage material,
A latent heat heat storage tank, wherein the heat exchange sheet includes a sheet-like base material and a heat medium flow pipe disposed in a groove provided in the base material and capable of circulating a heat medium.   The said heat exchange sheet | seat is wound in the spiral shape so that the space | interval in the normal line direction of a sheet | seat surface may be 30 mm or more and 80 m or less, It is bent, or two or more are parallel. Latent heat storage tank.   The heating medium flow pipe includes a plurality of straight portions arranged in a straight line and a curved portion connecting the straight portions, and an interval between the adjacent straight portions is 40 mm or more and 100 mm or less. Item 3. The latent heat storage tank according to item 1 or 2. A latent heat storage tank according to any one of claims 1 to 3 and a heat source are provided,
A heat medium flowing through the heat medium flow pipe can receive heat from the heat source;
The hot water supply system, wherein the heat medium circulation pipe is connected to a supply pipe capable of supplying a heat medium into the latent heat storage tank and a discharge pipe capable of discharging the heat medium outside the latent heat storage tank.

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