JP2014152976A - Latent heat storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a latent heat storage system which is safe and achieves high heat transfer efficiency in heat exchange between a latent heat storage material and a heat transfer medium.SOLUTION: A latent heat storage system 1 according to one embodiment includes: a latent heat storage material 5; a first heat transfer medium 6 which conducts heat exchange with the latent heat storage material 5; a main heat exchange device 70 for conducting heat exchange between the latent heat storage material 5 and the first heat transfer medium 6; a second heat transfer medium 7 for bringing heat from the exterior and transferring the heat to the first heat transfer medium 6; a heat reception sub-heat exchange device 80 for conducting heat exchange between the first heat transfer medium 6 and the second heat transfer medium 7; a third heat transfer medium 8 for conducting heat exchange with the first heat transfer medium 6 and supplying the heat to the exterior; and a heat supply sub-heat exchange device 85 for conducting heat exchange between the first heat transfer medium 6 and the third heat transfer medium 8.

Description

  The present invention relates to a latent heat storage system for storing heat and using it when necessary.

  Conventionally, many heat storage systems for storing unnecessary heat and using the heat stored when necessary have been provided. In particular, a latent heat storage system that uses PCM (Phase Change Material), which is a latent heat storage material, as a heat storage material and absorbs and releases heat using latent heat has been provided in recent years.

  The latent heat storage material is solidified during heat dissipation and loses fluidity. For this reason, in a latent heat storage system, it is generally difficult to efficiently exchange heat between a heat transfer medium that carries heat from a heat source and PCM that is a heat storage material during heat absorption (heat storage).

  In the latent heat storage system disclosed in Patent Document 1 below, fluidity is imparted by mixing a latent heat storage material (erythritol) in oil, thereby increasing the efficiency of heat exchange during heat absorption and heat dissipation.

JP 2011-75142 A

  However, when the latent heat storage material is mixed with oil and circulated in a heat exchanger or the like, if the oil leaks for some reason, there is a risk of contamination or ignition.

  This invention is made | formed in view of such a subject, and provides the latent heat storage system which can exhibit safe and high heat-transfer efficiency in the heat exchange between a latent-heat storage material and a heat-transfer medium. For the purpose.

  The latent heat storage system according to the present invention for solving the above problems is a heat storage system for storing heat in a latent heat storage material, the first heat transfer medium for exchanging heat between the latent heat storage material and the latent heat storage material, A main heat exchange device for exchanging heat between the latent heat storage material and the first heat transfer medium, and a second heat transfer medium for carrying heat from the outside and transferring the heat to the first heat transfer medium Heat exchange between the first heat transfer medium and the second heat transfer medium for heat exchange, and a heat receiving auxiliary heat exchange device for performing heat exchange between the first heat transfer medium and the second heat transfer medium, to the outside A third heat transfer medium for supplying heat; and a sub-heat exchanger for heat supply for performing heat exchange between the first heat transfer medium and the third heat transfer medium. And

  Further, the latent heat storage method according to the present invention is the latent heat storage method for storing heat in the latent heat storage material using the first heat transfer medium, the second heat transfer medium, and the third heat transfer medium. A first heat exchange step of transferring heat from the heat transfer medium to the first heat transfer medium; a second heat exchange step of transferring heat from the first heat transfer medium to the latent heat storage material and storing heat in the latent heat storage material; A third heat exchange step for transferring heat from the latent heat storage material to the first heat transfer medium; and a fourth heat exchange step for transferring heat to the third heat transfer medium that carries heat from the first heat transfer medium to the outside. It is characterized by providing.

  According to the latent heat storage system of the present invention, heat can be exchanged safely and efficiently even between the latent heat storage material and the heat transfer medium in the solid phase.

FIG. 1 is a schematic diagram conceptually showing the configuration of a latent heat storage system according to an embodiment of the present invention. FIG. 2 is a front view of the latent heat storage system according to the embodiment of the present invention. FIG. 3 is a plan view of the latent heat storage system according to the embodiment of the present invention. FIG. 4 is a vertical sectional view of the heat storage tank according to the embodiment of the present invention. FIG. 5 is a horizontal sectional view of the heat storage tank according to the embodiment of the present invention. FIG. 6 is a horizontal sectional view of the solid-liquid heat exchanger according to the embodiment of the present invention. FIG. 7 is a vertical sectional view of the solid-liquid heat exchanger according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram conceptually showing the configuration of the latent heat storage system according to the present embodiment. FIG. 2 is a front view showing the configuration of the latent heat storage system according to the present embodiment. FIG. 3 is a plan view showing the configuration of the latent heat storage system according to the present embodiment. 2 and 3 are partially shown in cross section and schematically show a part. FIG. 4 is a vertical sectional view of the heat storage tank according to the present embodiment. FIG. 5 is a horizontal sectional view of the heat storage tank according to the present embodiment.

  In this embodiment, thermal energy obtained from an external heat receiving device 90 that collects solar heat is stored in a PCM (Phase Change Material) 5 that is a latent heat storage material with high-temperature latent heat of 100 ° C. or higher. A high-temperature latent heat storage system that provides hot water to a hot water supply facility that is an external heat supply device 95 as required will be described. In this embodiment, erythritol is used as the PCM 5, but other latent heat storage materials may be used as appropriate.

  The latent heat storage system 1 according to the present embodiment includes a propylene glycol aqueous solution (second heat transfer medium) 7 that transfers heat from an external heat receiving device 90 to the latent heat storage system 1 and the PCM 5, or from the latent heat storage system 1 to the outside. Instead of directly exchanging heat between the water (third heat transfer medium) 8 for transferring heat to the heat supply device 95 and the PCM 5, as shown in FIG. 1, an aqueous diethylene glycol solution (first heat transfer medium) 6 is characterized in that heat is exchanged via the heat exchanger 6.

  That is, at the time of heat storage, the heat collected by the heat receiving device 90 is carried to the latent heat storage system 1 by the propylene glycol aqueous solution (second heat transfer medium) 7, and in the heat receiving auxiliary heat exchange device 80, the propylene glycol aqueous solution (first The heat is transferred from the second heat transfer medium 7 to the diethylene glycol aqueous solution (first heat transfer medium) 6 (first heat exchange step). Subsequently, in the main heat exchange device 70, heat exchange is performed between the diethylene glycol aqueous solution (first heat transfer medium) 6 and the PCM 5, and heat is stored in the PCM 5 (second heat exchange step).

  Further, at the time of heat release (heat supply), heat exchange is performed between the PCM 5 and the diethylene glycol aqueous solution (first heat transfer medium) 6 in the main heat exchange device 70, and the heat stored in the PCM 5 is converted into the diethylene glycol aqueous solution (first heat transfer medium). Heat is transferred to (one heat transfer medium) 6 (third heat exchange step). Subsequently, heat is transferred from the diethylene glycol aqueous solution (first heat transfer medium) 6 to the water (third heat transfer medium) 8 in the auxiliary heat exchange device 85 for heat supply (fourth heat exchange step) to become hot water. Water (third heat transfer medium) 8 is supplied to the heat supply device 95.

  As shown in FIGS. 2 and 3, specifically, the latent heat storage system 1 includes a heat storage tank 10 that is a heat storage main body, a first heat medium circulation device 30 for circulating the first heat transfer medium 6, and A second heat medium circulation device 40 for circulating the second heat transfer medium 7, a third heat medium circulation device 50 for circulating the third heat transfer medium 8, and a control device 60 are provided.

  The heat storage tank 10 is provided with two of the first heat storage tank 10A and the second heat storage tank 10B so that hot water can be provided for a long time. Each heat storage tank 10 includes a main heat exchange tank 11, a solid-liquid heat exchanger 12, a sub heat exchange tank 21, and a heat insulating material 25 for insulating the periphery of the heat storage tank 10.

  The main heat exchange tank 11 is a substantially rectangular parallelepiped storage tank that stores the PCM 5 without circulating it. In order to exchange heat between the PCM 5 and the first heat transfer medium 6, the main heat exchange tank 11 A large number of solid-liquid heat exchangers 12 are arranged in the tank 11 so as to be immersed in the PCM 5. A large number of fins 111 are formed on the inner peripheral wall surface of the main heat exchange tank 11 and project from the upper end to the lower end and project into the layer.

  The volume of the PCM5 that is a latent heat storage material changes between a liquid phase state and a solid phase state. In FIG. 4, the upper surface line when the PCM 5 accommodated in the main heat exchange tank 11 is in the liquid phase is indicated by L1, and the upper surface line when the PCM 5 is in the solid phase is indicated by L2.

  The solid-liquid heat exchanger 12 is an aluminum alloy heat exchanger having a vertically long rectangular parallelepiped shape. As shown in FIG. 3, a total of 48 columns of 4 columns × 12 rows are arranged in the main heat exchange tank 11. Has been. The solid-liquid heat exchanger 12 performs heat exchange between the first heat transfer medium 6 flowing through the flow path inside the PCM 5 located outside the first heat transfer medium 6, that is, between the liquid and the solid (in the solid phase). . For this reason, the solid-liquid heat exchanger 12 has a remarkably large heat transfer area compared with the conventional heat exchanger.

  FIG. 6 is a horizontal sectional view of the solid-liquid heat exchanger according to the present embodiment, and FIG. 7 is a vertical sectional view of the solid-liquid heat exchanger according to the present embodiment. The solid-liquid heat exchanger 12 includes an elongated rectangular parallelepiped-shaped channel body 14 that forms a channel through which the first heat transfer medium 6 flows, and a number of thin plate-like members that protrude vertically from both side surfaces of the channel body 14. The fin 15 is provided.

  The flow path main body 14 has seven partition walls 141 that extend vertically from the upper end to the lower end in a rectangular parallelepiped at equal intervals, and the eight vertical flow paths 142 that extend in the vertical direction by the partition walls 141. Is formed. The partition wall 141 has a slightly shorter upper end or lower end, and communication paths 143 for communicating adjacent longitudinal channels 142 are alternately formed on the upper side or the lower side.

  In addition, an inlet / outlet pipe 147 serving as an inlet / outlet to the internal channel is provided at one upper end portion (the upper left end portion in FIG. 7) of the flow channel body 14 and the other upper end portion (the upper right end portion in FIG. 7). Each is installed. Therefore, the first heat transfer medium 6 that has entered the flow channel main body 14 from one of the inlet / outlet pipes 147 passes through the eight vertical flow channels 142 in the vertical direction in the flow channel main body 14 and then moves to the other inlet / outlet. The pipe 147 exits from the flow path body 14. Thus, a very long flow path for the first heat transfer medium 6 is formed in the flow path body 14.

  The fins 15 are installed on one side of the flow path main body 14 so that a total of 42 fins 15 protrude from the single flow path main body 14, and the solid-liquid heat exchanger 12 has a large surface area. It will be. The fin 15 protrudes so as to enter the inside of the PCM 5 stored in the heat storage tank 10, and is between the first heat transfer medium 6 that flows in the flow path body 14 and the PCM 5 that loses fluidity in the solid phase. This enables heat exchange with high heat transfer efficiency.

  The auxiliary heat exchange tank 21 is a large rectangular tube-shaped storage tank that is installed around the side of the main heat exchange tank 11 so that the inside functions as a flow path for the first heat transfer medium 6. To do. In the auxiliary heat exchange tank 21, a heat receiving circulation pipe 22 through which the second heat transfer medium 7 flows and a heat supply circulation pipe 23 through which the third heat transfer medium 8 flows are installed.

  The heat receiving circulation pipe 22 and the heat supplying circulation pipe 23 are installed so as to circulate many times in the horizontal direction while slightly inclining in the sub heat exchange tank 21, and as shown in FIG. The circulation pipe 22 for circulation is installed so as to circulate on the outer peripheral wall side of the auxiliary heat exchange tank 21 and the circulation pipe 23 for heat supply circulates on the inner peripheral wall side of the auxiliary heat exchange tank 21.

  Therefore, in the auxiliary heat exchange tank 21, heat exchange can be performed between the second heat transfer medium 7 flowing in the heat receiving circulation pipe 22 and the first heat transfer medium 6 flowing in the auxiliary heat exchange tank 21. At the same time, heat exchange can be performed between the third heat transfer medium 8 flowing in the heat supply circulation pipe 23 and the first heat transfer medium 6 flowing in the auxiliary heat exchange tank 21.

  The first heat medium circulation device 30 is a first circulation line 31 that is a path through which the first heat transfer medium 6 circulates and a drive source for circulating the first heat transfer medium 6 on the first circulation line 31. And a first circulation pump 33.

  The first circulation line 31 exchanges heat with the PCM 5 in the main heat exchange tank 11, and exchanges heat with the second heat transfer medium 7 or the third heat transfer medium 8 in the sub heat exchange tank 21. Is a flow path for circulating between the main heat exchange tank 11 and the sub heat exchange tank 21. The first circulation line 31 is a flow path in the main heat exchange layer 11 (longitudinal flow path 142, communication path 143, inlet / outlet pipe 147), a flow path in the auxiliary heat exchange tank 21, and other flow paths connecting them. And.

  The first circulation line 31 connected to the output side of the first circulation pump 33 branches into 12 pipes so as to correspond to each row of the solid-liquid heat exchanger 12 arranged in 4 columns × 12 rows. Then, after branching into four more pipes to correspond to each row, they are connected to an inlet / outlet pipe 147 which is an inlet of each solid-liquid heat exchanger 12.

  On the other hand, as for the piping of the first circulation line 31 connected to the inlet / outlet pipe 147 at the outlet of each solid-liquid heat exchanger 12, first, the four pipes in each column are joined together, and then the 12 pipes in each row. Are joined to one pipe and connected to the input side of the first circulation pump 33.

  That is, in the present embodiment, substantially 48 solid-liquid heat exchangers 12 are all installed in parallel on the first circulation line 31, but depending on the output of the first circulation pump 33, A predetermined number of solid-liquid heat exchangers 12 may be connected in parallel or in series as appropriate, such as connecting four solid-liquid heat exchangers 12 in each row in series.

  In the present embodiment, two heat storage tanks 10 are installed, and two first heat medium circulation devices 30 are installed for each heat storage tank 10. That is, one first circulation line 31 and one first circulation pump 33 are installed for each heat storage tank 10.

  The second heat medium circulating device 40 is a second circulation line 41 that is a path through which the second heat transfer medium 7 circulates and a drive source for circulating the second heat transfer medium 7 on the second circulation line 41. And a second circulation pump 43.

  The second circulation line 41 circulates the second heat transfer medium 7 that exchanges heat with the first heat transfer medium 6 in the sub heat exchange tank 21 between the external heat receiving device 90 and the sub heat exchange tank 21. It is a flow path. The second circulation line 41 includes a flow path (heat receiving circulation pipe 22) in the auxiliary heat exchange tank 21 and other flow paths connected to the heat receiving device 90.

  The second circulation line 41 connected to the output side of the second circulation pump 43 is directed to the heat receiving device 90, and the second circulation line 41 returned from the heat receiving device 90 is the inlet of the heat receiving circulation pipe 22 (see FIG. 2, the auxiliary heat exchange tank 21 is connected to the upper left part). The second circulation line 41 connected to the outlet of the heat receiving circulation pipe 22 (in FIG. 2, the lower left portion of the auxiliary heat exchange tank 21) is connected to the input side of the second circulation pump 43.

  The third heat medium circulation device 50 is a third circulation line 51 that is a path through which the third heat transfer medium 8 circulates, and a drive source for circulating the third heat transfer medium 8 on the third circulation line 51. And a third circulation pump 53.

  The third circulation line 51 circulates the third heat transfer medium 8 that exchanges heat with the first heat transfer medium 6 in the sub heat exchange tank 21 between the external heat supply device 95 and the sub heat exchange tank 21. It is a flow path for. The third circulation line 51 includes a flow path (heat supply circulation pipe 23) in the auxiliary heat exchange tank 21 and other flow paths connected to the heat supply device 95.

  The third circulation line 51 connected to the output side of the third circulation pump 53 is directed to the heat supply device 95, and the third circulation line 51 returned from the heat supply device 95 is connected to the heat supply circulation pipe 23. It is connected to the inlet (in FIG. 2, the upper left part of the sub heat exchange tank 21). The third circulation line 51 connected to the outlet of the heat supply circulation pipe 23 (in FIG. 2, the lower left portion of the auxiliary heat exchange tank 21) is connected to the input side of the third circulation pump 53.

  The control device 60 is a device for controlling the operation of the latent heat storage system 1, and is connected to the heat medium circulation devices 30, 40, 50, and the like. The control device 60 appropriately switches the circulation lines 31, 41, 51 and circulation pumps 33, 43, 53 when switching between heat storage and heat supply or switching between the first heat storage tank 10A and the second heat storage tank 10B. Control the drive.

  Although the specific configuration of the latent heat storage system 1 has been described above, the main heat exchange device 70 that performs heat exchange between the first heat transfer medium 6 and the PCM 5 includes the main heat exchange tank 11 and the solid-liquid heat exchanger 12. And a part of the first heat medium circulating device 30 is included.

  Further, the heat receiving auxiliary heat exchange device 80 that performs heat exchange between the first heat transfer medium 6 and the second heat transfer medium 7 includes the auxiliary heat exchange tank 21, a part of the first heat medium circulation device 30, A part of the two heat medium circulating device 40. Moreover, the auxiliary heat exchange device 85 for heat supply that performs heat exchange between the first heat transfer medium 6 and the third heat transfer medium 8 includes the auxiliary heat exchange tank 21, a part of the second heat medium circulation device 40, A part of the third heat medium circulation device 50.

  In this embodiment, the flow path of the first heat transfer medium 6 in the heat receiving auxiliary heat exchange device 80 (sub heat exchange tank 21) and the flow path of the first heat transfer medium 6 in the heat supply auxiliary heat exchange device 85 ( The auxiliary heat exchange tank 21) shares the same flow path, and an efficient heat exchange can be realized by a compact device.

  The configuration of the latent heat storage system 1 has been described above. Subsequently, in the latent heat storage system 1, the process of storing heat collected by the external heat receiving device 90, and the stored heat are radiated to external supply. The flow of processing for supplying heat to the heat device will be described in detail.

  First, at the time of heat storage, the second heat transfer medium 7 heated by solar heat collected by the external heat receiving device 90 reaches the inside of the latent heat storage system 1 through the second circulation line 41. The second heat transfer medium 7 that has reached the sub heat exchange tank 21 constituting the heat receiving sub heat exchange device 80 dissipates heat while flowing in the heat receiving circulation pipe 22, and the heat receiving circulation pipe 22 is received in the sub heat exchange tank 21. Heat exchange with the first heat transfer medium 6 flowing outside.

  The second heat transfer medium 7 radiated by heat exchange in the heat receiving auxiliary heat exchanging device 80 circulates again to the external heat receiving device 90 through the second circulation line 41 and again absorbs solar heat.

  The first heat transfer medium 6 that has absorbed heat in the sub heat exchange tank 21 reaches the solid-liquid heat exchanger 12 that constitutes the main heat exchange tank 11 through the first circulation line 31. In the solid-liquid heat exchanger 12, the first heat transfer medium 6 radiates heat while flowing through the flow path in the flow path body 14, and is stored in the main heat exchange tank 11 outside the solid-liquid heat exchanger 12. Exchange heat with PCM5.

  In this embodiment, erythritol used as PCM5 has a melting point of 119 ° C. and a heat of fusion of 340 kJ / kg, and the endothermic PCM5 stores heat while changing from a solid at room temperature to a liquid state through a phase change.

  Subsequently, when heat is supplied to the outside for radiating the heat stored in the PCM 5, first, the PCM 5 in the main heat exchange tank 11 radiates and exchanges heat with the first heat transfer medium 6 in the solid-liquid heat exchanger 12. To do. At this time, the PCM 5 changes its state from a liquid to a solid and releases a large amount of heat of fusion.

  The first heat transfer medium 6 that has absorbed heat from the PCM 5 passes through the first circulation line 31, reaches the sub heat exchange tank 21 that constitutes the heat supply sub heat exchange device 85, and passes through the heat supply circulation pipe 23. Heat exchange with the flowing third heat transfer medium 8 is performed.

  The temperature of the third heat transfer medium 8 that has absorbed heat in the heat supply circulation pipe 23 rises to about 95 ° C., for example, and is supplied to the external heat supply device 95 through the third circulation line 51. As the heat supply device 95, for example, a hot water supply facility for farmhouse cultivation of agricultural products, a snow melting facility for road traffic facilities, and the like are assumed.

  In the present embodiment, the first circulation line 31 and the first circulation pump 33 are connected to the first circulation line 31A and the first circulation pump 33A connected to the first heat storage tank 10A and the second heat storage tank 10B. A first circulation line 31B and a first circulation pump 33B are installed. For example, in the first heat storage tank 10A, a heat receiving operation is performed in the daytime on the first day and a heat supply operation is performed for 24 hours on the second day, and in the second heat storage tank 10B, heat is received in the daytime on the second day. By performing the operation and performing the heat supply operation for 24 hours on the third day, it is possible to perform the continuous heat supply for 24 hours on and after the second day.

  Thus, in the latent heat storage system 1 according to the present embodiment, when heat is exchanged between the solidified PCM 5 and the first heat transfer medium 6, there is no need to mix the PCM 5 in oil or the like in order to fluidize it. The solid-liquid heat exchanger 12 having a large heat transfer area can directly exchange heat between the solidified PCM 5 and the first heat transfer medium 6, and there is no risk of oil spilling, Highly safe heat storage can be realized.

  Moreover, in this embodiment, in order to implement | achieve the latent heat storage to PCM5, in order to carry out heat exchange with the 1st heat transfer medium 6 which carries in heat from the 1st heat transfer medium 6 for heat exchange with PCM5, and the exterior. By using three heat transfer media, the third heat transfer medium 8 for exchanging heat with the second heat transfer medium 7 and the first heat transfer medium 6 to carry the heat to the outside, each heat transfer medium is required. It is possible to independently select a heat medium suitable for the work, and to realize highly efficient latent heat storage.

  Although the embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. For example, the shape and size of each member constituting the latent heat storage system according to the above embodiment can be changed as appropriate.

  Also, other materials can be used as appropriate for the first to third heat transfer media. However, as the first heat transfer medium, it is desirable to use an antifreeze solution such as a diethylene glycol aqueous solution so that it can be operated even in a sub-zero environment such as winter.

1 Latent heat storage system 5 PCM
6 First heat transfer medium (diethylene glycol aqueous solution)
7 Second heat transfer medium (propylene glycol aqueous solution)
8 Third heat transfer medium (water)
DESCRIPTION OF SYMBOLS 10 Heat storage tank 11 Main heat exchange tank 12 Solid-liquid heat exchanger 14 Flow path main body 15 Fin 21 Sub heat exchange tank 22 Heat receiving circulation pipe 23 Heat supply circulation pipe 25 Heat insulating material 30 First heat medium circulation device 31 First circulation Line 33 First circulation pump 40 Second heat medium circulation device 41 Second circulation line 43 Second circulation pump 50 Third heat medium circulation device 51 Third circulation line 53 Third circulation pump 60 Control device 70 Main heat exchange device 80 Heat receiving Secondary heat exchanger 85 Heat supply secondary heat exchanger 90 Heat receiving device 95 Heat supply device

Claims (5)

In the latent heat storage system that stores heat in the latent heat storage material,
Latent heat storage material,
A first heat transfer medium that exchanges heat with the latent heat storage material;
A main heat exchange device for exchanging heat between the latent heat storage material and the first heat transfer medium;
A second heat transfer medium for carrying heat from outside and transferring heat to the first heat transfer medium;
A heat receiving auxiliary heat exchange device for performing heat exchange between the first heat transfer medium and the second heat transfer medium;
A third heat transfer medium for exchanging heat with the first heat transfer medium and supplying heat to the outside;
A sub-heat exchanger for heat supply for performing heat exchange between the first heat transfer medium and the third heat transfer medium;
A latent heat storage system comprising:   The latent heat storage system according to claim 1, wherein the latent heat storage material is stored in the main heat exchange device without being circulated. A first heat transfer medium circulation device for circulating the first heat transfer medium between the main heat exchange device, the heat receiving auxiliary heat exchange device and the heat supply auxiliary heat exchange device;
A second heat transfer medium circulating device for circulating the second heat transfer medium between the heat receiving auxiliary heat exchange device and an external heat receiving device;
A third heat transfer medium circulation device for circulating the third heat transfer medium between the auxiliary heat exchange device for heat supply and an external heat supply device;
The latent heat storage system according to claim 1, further comprising:   4. The latent heat storage system according to claim 3, wherein circulation paths in the sub-heat exchanger for heat reception of the first heat transfer medium and the sub-heat exchanger for heat supply share the same flow path. In the latent heat storage method of storing heat in the latent heat storage material using the first heat transfer medium, the second heat transfer medium, and the third heat transfer medium,
A first heat exchange step of transferring heat from the second heat transfer medium that carries heat from the outside to the first heat transfer medium;
Heat transfer from the first heat transfer medium to the latent heat storage material, a second heat exchange step of storing heat in the latent heat storage material;
A third heat exchange step for transferring heat from the latent heat storage material to the first heat transfer medium;
A fourth heat exchange step of transferring heat to the third heat transfer medium that carries heat from the first heat transfer medium to the outside;
A latent heat storage method comprising:

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