A combined heat pipe system and building structure using the same

Abstract

The present invention provides a combined heat pipe system and a building structure used therein, wherein the combined heat pipe system comprises: at least one first heat pipe, which is placed obliquely in the building structure, wherein the evaporation section of the first heat pipe is close to the outer wall of the building structure, and the condensation section is close to the inner wall of the building structure; at least one second heat pipe, which is placed obliquely in the building structure, wherein the evaporation section of the second heat pipe is close to the inner wall of the building structure, and the condensation section is close to the outer wall of the building structure; a first pipeline, which is connected to the evaporation section of each first heat pipe, and is used to fill the first heat pipe with a working medium or to empty the working medium in the first heat pipe; a second pipeline, which is connected to the evaporation section of each second heat pipe, and is used to fill the second heat pipe with a working medium or to empty the working medium in the second heat pipe. The present invention can quickly transfer heat to the outdoors when the indoor room of the building needs cooling, and quickly transfer outdoor heat to the indoor room when the indoor room of the building needs heating, thereby reducing the energy consumption of air conditioning cooling and heating, and saving energy.

Description

Technical Field

[0001] The present invention belongs to the field of building engineering technology, in particular to the field of energy-saving building technology, and specifically relates to a combined heat pipe system and a building structure using the same. Background Art

[0002] Heat pipes utilize the phase change process of the working medium evaporating at the hot end and condensing at the cold end (i.e., utilizing the latent heat of vaporization and condensation of the liquid) to rapidly conduct heat. A typical heat pipe consists of a shell, a wick, and end caps. The interior of the heat pipe is evacuated to a negative pressure and filled with a suitable liquid. The boiling point of this liquid can be controlled by the degree of vacuum and the choice of medium, resulting in heat pipes with different starting temperatures. When the temperature of the evaporator section of the heat pipe exceeds the boiling point of the liquid, the working fluid in the wick evaporates, removing heat. The vapor flows through the central channel to the condenser section of the heat pipe, condensing into liquid while releasing latent heat. Under gravity or capillary attraction, the liquid returns to the evaporator section, thus completing a closed loop and transferring a large amount of heat from the heating section to the heat dissipation section. When the heating section is at the bottom and the cooling section is at the top, and the heat pipe is placed vertically, gravity can adequately return the working fluid, eliminating the need for a capillary wick. Heat pipes without a porous wick are called thermosiphons.

[0003] Heat pipe technology is widely used in industries such as aerospace and military, particularly to enhance heat exchange. Heat pipes can transfer heat quickly and efficiently, with thermal conductivity reaching tens or even hundreds of times that of metallic copper.

[0004] In the building sector, particularly in regions with hot summers and cold winters, outdoor temperatures are higher than indoor temperatures during parts of winter and spring due to the thermal inertia of buildings and the effects of solar radiation. Even when it's warm outside, indoor temperatures can still be quite chilly. Rapidly transferring large amounts of outdoor heat indoors can improve indoor thermal comfort and reduce heating energy consumption. During parts of summer and autumn, outdoor temperatures are cooler, but indoor temperatures are higher due to heat generated by equipment and personnel inside the building, as well as the thermal inertia of the building. In these cases, rapidly transferring indoor heat outdoors can lower indoor temperatures, making the room cooler and reducing air conditioning and cooling energy consumption. Existing research has primarily focused on efficiently transferring outdoor solar heat indoors through heat pipes during winter, without considering the positive or negative effects of heat pipes in other seasons. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a combined heat pipe system and a building structure using the same, so as to solve the problem in the prior art that heat pipes cannot be used to adjust indoor temperature according to seasons.

[0006] To achieve the above-mentioned objectives and other related objectives, an embodiment of the present invention provides a combined heat pipe system for use in a building structure, wherein the building structure is a wall or roof of a house; the combined heat pipe system comprises: at least one first heat pipe, obliquely placed in the building structure, the evaporation section of the first heat pipe being close to the outer wall of the building structure, and the condensation section being close to the inner wall of the building structure; at least one second heat pipe, obliquely placed in the building structure, the evaporation section of the second heat pipe being close to the inner wall of the building structure, and the condensation section being close to the outer wall of the building structure; a first pipeline, connected to the evaporation section of each of the first heat pipes, for filling the first heat pipe with a working medium or emptying the working medium in the first heat pipe; a second pipeline, connected to the evaporation section of each of the second heat pipes, for filling the second heat pipe with a working medium or emptying the working medium in the second heat pipe.

[0007] In one embodiment of the present invention, the condensing section of the first heat pipe is higher than the evaporating section; the condensing section of the second heat pipe is higher than the evaporating section.

[0008] In one embodiment of the present invention, the activation temperature of the first heat pipe is 10° C. to 24° C.; the activation temperature of the second heat pipe is above 25° C.

[0009] In one embodiment of the present invention, the angle between the first heat pipe and the horizontal plane is 30°~60°; the angle between the second heat pipe and the horizontal plane is 30°~60°.

[0010] In one embodiment of the present invention, the diameter of the first heat pipe is 3 cm to 5 cm; the diameter of the second heat pipe is 3 cm to 5 cm.

[0011] In one embodiment of the present invention, the distance between each of the first heat pipes, the distance between each of the second heat pipes, and the distance between the first heat pipe and the second heat pipe are all 20 cm to 35 cm.

[0012] In one embodiment of the present invention, the length of the evaporation section of the first heat pipe is 1 cm to 3 cm; the length of the evaporation section of the second heat pipe is 1 cm to 3 cm.

[0013] In one embodiment of the present invention, when the first heat pipe is filled with the working medium, the second heat pipe is emptied of the working medium; when the first heat pipe is emptied of the working medium, the second heat pipe is filled with the working medium.

[0014] In one embodiment of the present invention, the combined heat pipe system further includes: a first storage tank for storing the working medium to be filled into the first heat pipe; a first storage tank for storing the working medium to be filled into the first heat pipe; a first pump body, respectively connected to the first storage tank and the first pipeline, for controlling the filling of the working medium in the first storage tank into the first heat pipe, or emptying the working medium in the first heat pipe into the first storage tank; a second pump body, respectively connected to the second storage tank and the second pipeline, for controlling the filling of the working medium in the second storage tank into the second heat pipe, or emptying the working medium in the second heat pipe into the second storage tank.

[0015] An embodiment of the present invention further provides a building structure, characterized in that the combined heat pipe system as described above is applied.

[0016] As described above, the combined heat pipe system of the present invention and the building structure using the same have the following beneficial effects:

[0017] The present invention can quickly transfer heat to the outside when the room needs cooling, and quickly transfer outdoor heat to the room when the room needs heating, thereby reducing air conditioning cooling and heating energy consumption and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It shows a schematic diagram of the principle structure of the combined heat pipe system of the present invention when it is applied to a wall.

[0019] Figure 2 It shows the overall structural diagram of the combined heat pipe system of the present invention when applied to a roof.

[0020] Component number description

[0021] 100-Combined heat pipe system;

[0022] 110-first heat pipe;

[0023] 111-evaporation section;

[0024] 112- condensation section;

[0025] 120- second heat pipe;

[0026] 121-evaporation section;

[0027] 122- condensation section;

[0028] 130-first pipeline;

[0029] 140-second pipeline;

[0030] 150-first storage tank;

[0031] 160-Second storage tank;

[0032] 170-first pump body;

[0033] 180-second pump body;

[0034] 200-Building structure. DETAILED DESCRIPTION

[0035] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0036] The purpose of this embodiment is to provide a combined heat pipe system and a building structure using the same, so as to solve the problem in the prior art that heat pipes cannot be used to adjust indoor temperature according to seasons.

[0037] The principles and implementation methods of a combined heat pipe system and a building structure using the same in this embodiment will be described in detail below, so that those skilled in the art can understand the combined heat pipe system and a building structure using the same without creative work. Example 1

[0038] like Figure 1 As shown, this embodiment provides a combined heat pipe system 100 for use in a building structure 200, which is a wall or roof of a house. The combined heat pipe system 100 includes at least one first heat pipe 110, at least one second heat pipe 120, a first pipeline 130, and a second pipeline 140.

[0039] Specifically, in this embodiment, the first heat pipe 110 is placed obliquely in the building structure 200 , the evaporation section 111 of the first heat pipe 110 is close to the outer wall of the building structure 200 , and the condensation section 112 is close to the inner wall of the building structure 200 .

[0040] The evaporator section 111 of the first heat pipe 110 is located on the exterior surface of a wall or roof, and the condenser section 112 is located on the interior surface of the wall or roof. The activation temperature is higher than the indoor temperature of the building during the heating season. During the heating season, when the exterior wall and roof surface temperatures are higher than the indoor temperature due to sunlight or high outdoor temperatures, outdoor heat can be quickly transferred indoors through the first heat pipe 110. Otherwise, the heat pipe will not activate, and no heat transfer will occur.

[0041] In this embodiment, the condensing section 112 of the first heat pipe 110 is higher than the evaporating section 111. When the wall and roof structures are not affected, the evaporating section 111 and / or condensing section 112 of the first heat pipe 110 may be provided with fins to enhance heat exchange.

[0042] The first heat pipe 110 is placed obliquely between the outer wall and the roof, the evaporation section 111 is lower than the condensation section 112, the end of the evaporation section 111 of the first heat pipe 110 is located on the outer wall surface of the wall, and the condensation section 112 is located on the inner wall surface. The evaporation section 111 and the condensation section 112 of the first heat pipe 110 do not extend outside the wall and do not affect the appearance of the wall.

[0043] In this embodiment, the activation temperature of the first heat pipe 110 is, but not limited to, 10° C. to 24° C.

[0044] The starting temperature of the working medium of the first heat pipe 110 is determined based on the local climate and whether the building uses air conditioning, cooling, or heating equipment. Taking regions with hot summers and cold winters as an example, according to indoor thermal comfort standards and indoor thermal comfort environment surveys, when the building rarely uses air conditioning, cooling, or heating equipment, the starting temperature of the first heat pipe 110 is, for example, 14°C. When the building frequently uses air conditioning, cooling, or heating equipment, the starting temperature of the first heat pipe 110 is, for example, 18°C.

[0045] After determining the starting temperature of the first heat pipe 110 , the corresponding working medium of the first heat pipe 110 is selected, and the vacuum degree in the first heat pipe 110 is determined based on the relationship between the boiling point and the pressure in the thermophysical parameters of the working medium.

[0046] Specifically, in this embodiment, the first pipeline 130 is connected to the evaporation section 111 of each first heat pipe 110 and is used to fill the first heat pipe 110 with working medium or empty the first heat pipe 110 with working medium.

[0047] In this embodiment, the evaporator section 111 of the first heat pipe 110 has a reserved interface connected to the first pipeline 130 to facilitate the filling or emptying of the working medium into or out of the first heat pipe 110. The first pipeline 130 can be made of a pipe such as PPR, and the specific pipe diameter is calculated based on the total amount of working medium in the heat pipe. The working medium of the first heat pipe 110 is filled or emptied once a year, and the filling or emptying period can be approximately 24-48 hours, ensuring that each first heat pipe 110 can be filled or emptied of the medium.

[0048] The inclination angle of the first heat pipe 110 is determined according to the thickness and structural requirements of the wall to be used. In this embodiment, the angle between the first heat pipe 110 and the horizontal plane is 30° to 60°.

[0049] In this embodiment, the diameter of the first heat pipe 110 is 3 cm to 5 cm, and the length of the evaporation section of the first heat pipe 110 is 1 cm to 3 cm. Preferably, the length of the evaporation section 111 of the first heat pipe 110 is 2 cm.

[0050] During the heating season, when the temperature of the building's exterior walls and roof surfaces exceeds the indoor temperature of the building due to sunlight or high outdoor temperatures, and the temperature of the evaporator section 111 of the first heat pipe 110 in the wall or roof exceeds the boiling point of the liquid, the working medium (liquid medium) in the first heat pipe 110 is heated and evaporates, forming saturated vapor, which removes heat. The saturated vapor flows from the central channel toward the condenser section 112 of the first heat pipe 110, condensing into liquid droplets while releasing latent heat. Under the influence of gravity or capillary adsorption, the liquid droplets flow back to the evaporator section 111. This completes a closed loop, transferring a large amount of heat from the evaporator section 111 to the condenser section 112, allowing the outdoor heat to be quickly transferred to the indoor space through the first heat pipe 110. Because the evaporator section 111 is at the bottom and the condenser section 112 is at the top, when the first heat pipe 110 is tilted vertically, the return flow of the liquid droplets is sufficient due to gravity.

[0051] Specifically, in this embodiment, the second heat pipe 120 is placed obliquely in the building structure 200 , the evaporation section 121 of the second heat pipe 120 is close to the inner wall of the building structure 200 , and the condensation section 122 is close to the outer wall of the building structure 200 .

[0052] The evaporation section 121 of the second heat pipe 120 is located on the inner surface of a wall or roof, and the condensation section 122 is located on the outer surface of the wall or roof. The activation temperature is lower than the indoor temperature during the cooling season. During cooling seasons, when the temperature of the building's exterior walls and roof's exterior surfaces is lower than the indoor temperature, the second heat pipe 120 activates, allowing indoor heat to be quickly transferred to the outdoors through the second heat pipe 120. Otherwise, the heat pipe does not activate, and no heat transfer occurs.

[0053] In this embodiment, the condensing section of the second heat pipe 120 is higher than the evaporating section. When the wall and roof structures are not affected, the evaporating section 121 and / or the condensing section 122 of the second heat pipe 120 may be provided with fins to enhance heat exchange.

[0054] The second heat pipe 120 is placed obliquely between the outer wall and the roof, the evaporation section 121 is lower than the condensation section 122, the end of the condensation section 122 of the second heat pipe 120 is located on the outer wall surface of the wall, and the evaporation section 121 is located on the inner wall surface. Neither the evaporation section 121 nor the condensation section 122 of the second heat pipe 120 extends outside the wall, and does not affect the appearance of the wall.

[0055] In this embodiment, the activation temperature of the second heat pipe 120 is, but not limited to, above 25°C.

[0056] The starting temperature of the working medium in the second heat pipe 120 is determined based on the local climate and whether the building uses air conditioning, cooling, or heating equipment. For example, in regions with hot summers and cold winters, based on indoor thermal comfort standards and indoor thermal comfort environment surveys, the starting temperature of the second heat pipe 120 is 26°C when the building uses less air conditioning, cooling, or heating equipment; and 28°C when the building uses more air conditioning, cooling, or heating equipment.

[0057] After determining the starting temperature of the second heat pipe 120 , the corresponding working medium of the second heat pipe 120 is selected, and the vacuum degree in the second heat pipe 120 is determined based on the relationship between the boiling point and the pressure in the thermophysical parameters of the working medium.

[0058] Specifically, in this embodiment, the second pipeline 140 is connected to the evaporation section 121 of each second heat pipe 120 and is used to fill the second heat pipe 120 with the working medium or empty the working medium in the second heat pipe 120 .

[0059] In this embodiment, the evaporator section 121 of the second heat pipe 120 has a reserved interface connected to the second pipeline 140, facilitating the filling or emptying of the working medium into or out of the second heat pipe 120. The second pipeline 140 can be made of a PPR pipe or other similar pipe. The specific pipe diameter is calculated based on the total amount of working medium in the heat pipe 120. The working medium in each second heat pipe 120 is filled or emptied once a year, with a filling or emptying period of approximately 24-48 hours, ensuring that each second heat pipe 120 can be filled or emptied of the medium.

[0060] The inclination angle of the second heat pipe 120 is determined according to the thickness and structural requirements of the wall to be used. In this embodiment, the angle between the second heat pipe 120 and the horizontal plane is 30° to 60°.

[0061] The diameter of the second heat pipe 120 is 3 cm to 5 cm; the length of the evaporation section 121 of the second heat pipe 120 is 1 cm to 3 cm. Preferably, the length of the evaporation section 121 of the second heat pipe 120 is 2 cm.

[0062] In this embodiment, the spacing between the first heat pipes 110, the spacing between the second heat pipes 120, and the spacing between the first heat pipe 110 and the second heat pipe 120 are all 20 cm to 35 cm. In other words, the spacing between the heat pipes is 20 cm to 35 cm.

[0063] During the cooling season, when the temperature of the building's exterior walls and roof is lower than the indoor temperature, and the temperature of the evaporator section 121 of the second heat pipe 120 on the inner wall of the wall or roof is higher than the boiling point of the liquid, the working medium (liquid medium) in the second heat pipe 120 is heated and evaporates, forming saturated vapor, which removes heat. The saturated vapor flows from the central channel toward the condenser section 122 of the second heat pipe 120 (i.e., the outer wall of the wall or roof), condensing into liquid droplets while releasing latent heat. Under the influence of gravity or capillary adsorption, the liquid droplets flow back to the evaporator section 121. This completes a closed loop, transferring a large amount of heat from the evaporator section 121 to the condenser section 122, allowing the second heat pipe 120 to quickly transfer the indoor heat to the outside. Because the evaporator section 121 is at the bottom and the condenser section 122 is at the top, when the second heat pipe 120 is tilted vertically, gravity can fully satisfy the return flow of the liquid droplets.

[0064] In this embodiment, when the first heat pipe 110 is filled with the working medium, the second heat pipe 120 is emptied of the working medium; when the first heat pipe 110 is emptied of the working medium, the second heat pipe 120 is filled with the working medium.

[0065] For example, from November 15th to April 15th of the following year, the first heat pipe 110 is filled with the working medium and the second heat pipe 120 is drained of the working medium. From April 16th to November 14th of the following year, the second heat pipe 120 is filled with the working medium and the first heat pipe 110 is drained of the working medium.

[0066] Two sets of first and second pipes 130, 140, embedded in the wall or roof structure, respectively charge and discharge the working medium from the first and second heat pipes 110, 120. The working medium is charged during operating hours and discharged during non-operating hours. This eliminates the need for a complex control system to meet year-round usage requirements and prevents the occurrence of irrational heat transfer processes. This is particularly useful in buildings in hot summers and cold winters, where heat can be quickly transferred outdoors when cooling is required and indoors when heating is required, reducing cooling and heating energy consumption and conserving energy.

[0067] like Figure 2 As shown, in this embodiment, the combined heat pipe system 100 further includes: a first storage tank 150 , a second storage tank 160 , a first pump body 170 and a second pump body 180 .

[0068] In this embodiment, the first storage tank 150 is used to store the working medium to be filled into the first heat pipe 110 ; in this embodiment, the second storage tank 160 is used to store the working medium to be filled into the second heat pipe 120 .

[0069] In this embodiment, the first pump body 170 is respectively connected to the first storage tank 150 and the first pipeline 130, and is used to control the filling of the working medium in the first storage tank 150 into the first heat pipe 110, or to empty the working medium in the first heat pipe 110 into the first storage tank 150.

[0070] In this embodiment, the second pump body 180 is respectively connected to the second storage tank 160 and the second pipeline 140, and is used to control the filling of the working medium in the second storage tank 160 into the second heat pipe 120, or to empty the working medium in the second heat pipe 120 into the second storage tank 160.

[0071] When multiple walls and roofs use the combined heat pipes of this embodiment, pipelines for filling / emptying the medium can be established separately for each layer and wall, or the pipelines can be connected to share a common storage tank.

[0072] That is to say, in this embodiment, the first heat pipe 110 and the second heat pipe 120 can use the same working medium and share a storage tank for storing the working medium. The working medium in the storage tank can be filled into the first heat pipe 110 or the working medium in the first heat pipe 110 can be emptied into the storage tank through the pump body on the first pipeline 130, and the working medium in the storage tank can be filled into the second heat pipe 120 or the working medium in the second heat pipe 120 can be emptied into the storage tank through the pump body on the second pipeline 140.

[0073] As can be seen above, the combined heat pipe system 100 of this embodiment comprises combined heat pipes (first heat pipe 110 and second heat pipe 120) embedded in walls and roofs. By controlling the filling and emptying of the working medium within the heat pipes, it can meet year-round usage requirements without a complex control system, thus avoiding the occurrence of irrational heat transfer processes. This is particularly useful in buildings in hot summers and cold winters. It can quickly transfer heat to the outdoors when cooling is required, and transfer outdoor heat to the indoors when heating is required, thereby reducing cooling and heating energy consumption and conserving energy. Example 2

[0074] like Figure 1 and Figure 2 As shown, this embodiment provides a building structure 200, and the building structure 200 applies the combined heat pipe system 100 described in Example 1. Figure 1 The building structure 200 shown in FIG is a wall of a house. Figure 2The building structure 200 shown in FIG. 2 is the roof of a building. Specifically, the combined heat pipe system 100 described in Example 1 is applied to one or more walls or one or more roofs of the building. The walls or roof can be prefabricated in a factory or cast on-site, without affecting the performance. The combined heat pipe system 100 has been described in detail in Example 1 and will not be repeated here.

[0075] In summary, the present invention can quickly transfer heat outdoors when cooling is needed, and quickly transfer heat indoors when heating is needed, thereby reducing cooling and heating energy consumption and conserving energy. Therefore, the present invention effectively overcomes the shortcomings of the prior art and has high industrial value.

[0076] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A combined heat pipe system, applied to a building structure, wherein the building structure is a wall or a roof of a house; characterized in that: The combined heat pipe system comprises: At least one first heat pipe is placed obliquely in the building structure, the evaporation section of the first heat pipe is close to the outer wall of the building structure, the condensation section is close to the inner wall of the building structure, and the starting temperature is higher than the indoor temperature of the building; At least one second heat pipe is placed obliquely in the building structure, the evaporation section of the second heat pipe is close to the inner wall of the building structure, the condensation section is close to the outer wall of the building structure, and the starting temperature is lower than the indoor temperature of the building; a first pipeline connected to the evaporation section of each of the first heat pipes and used for filling the first heat pipes with working medium or draining the working medium from the first heat pipes; a second pipeline connected to the evaporation section of each of the second heat pipes and used for filling the second heat pipes with working medium or draining the working medium from the second heat pipes; The evaporation section and / or the condensation section of the first heat pipe are provided with fins for enhancing heat exchange, and / or the evaporation section and / or the condensation section of the second heat pipe are provided with fins for enhancing heat exchange; When the first heat pipe is filled with working medium, the second heat pipe is emptied of working medium; when the first heat pipe is emptied of working medium, the second heat pipe is filled with working medium.

2. The combined heat pipe system according to claim 1, characterized in that: The condensing section of the first heat pipe is higher than the evaporating section; the condensing section of the second heat pipe is higher than the evaporating section.

3. The combined heat pipe system according to claim 1, characterized in that: The starting temperature of the first heat pipe is 10°C to 24°C; the starting temperature of the second heat pipe is above 25°C.

4. The combined heat pipe system according to claim 1, characterized in that: The included angle between the first heat pipe and the horizontal plane is 30°~60°; the included angle between the second heat pipe and the horizontal plane is 30°~60°.

5. The combined heat pipe system according to claim 1, characterized in that: The diameter of the first heat pipe is 3 cm to 5 cm; the diameter of the second heat pipe is 3 cm to 5 cm.

6. The combined heat pipe system according to claim 1, characterized in that: The distance between the first heat pipes, the distance between the second heat pipes, and the distance between the first heat pipe and the second heat pipe are all 20 cm to 35 cm.

7. The combined heat pipe system according to claim 1, characterized in that: The length of the evaporation section of the first heat pipe is 1 cm to 3 cm; the length of the evaporation section of the second heat pipe is 1 cm to 3 cm.

8. The combined heat pipe system according to claim 1, characterized in that: The combined heat pipe system also includes: A first storage tank, used for storing the working medium filled into the first heat pipe; A second storage tank, used for storing the working medium filled into the second heat pipe; a first pump body, connected to the first storage tank and the first pipeline respectively, and used to control the working medium in the first storage tank to be filled into the first heat pipe, or to empty the working medium in the first heat pipe to flow into the first storage tank; The second pump body is connected to the second storage tank and the second pipeline respectively, and is used to control the filling of the working medium in the second storage tank into the second heat pipe, or to empty the working medium in the second heat pipe into the second storage tank.

9. A building structure, characterized in that: A combined heat pipe system as described in any one of claims 1 to 8 is used.

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