Heat-conducting fluid heater

Abstract

The utility model relates to a heat conduction fluid heater which comprises a heating unit, the heating unit comprises a tubular shell, a heat conduction pipe arranged in the shell in a penetrating mode in the length direction and a heating pipe arranged in the heat conduction pipe in a penetrating mode, and an annular cavity used for containing heat conduction fluid is defined between the inner surface of the shell and the outer surface of the heat conduction pipe in the circumferential direction. An annular gap is reserved between the heat conduction pipe and the heating pipe in the circumferential direction. Compared with the prior art, the heat conduction pipe is additionally arranged between the heating pipe and the shell, under the condition that it is guaranteed that heat generated by the heating pipe is smoothly conducted to the heat conduction fluid, the actual flow speed of the heat conduction fluid is increased by reducing the flowing space of the heat conduction fluid, and therefore the heat exchange capacity of the heat conduction fluid is improved.

Description

Technical Field

[0001] This utility model relates to the field of thermally conductive fluid electric heat storage, and in particular to a thermally conductive fluid heater. Background Technology

[0002] Molten salt is a common heat-conducting fluid. It is a molten substance formed by the melting of salts. It is solid at room temperature and pressure, but becomes liquid when the temperature rises. Electric thermal storage uses an electric heater to heat the molten salt, thereby achieving high-temperature heat storage. The goal of this process is to raise the temperature of the molten salt as much as possible while ensuring its safety (without decomposition), in order to maximize the heat storage capacity of a unit amount of molten salt.

[0003] Currently, electric heaters used for heating molten salt (or heat transfer oil) are mainly direct-heating tubular electric heaters (where the molten salt is in direct contact with the heating tube), such as Chinese invention patents application number CN202411192709.6 (publication number CN118912694A) and application number CN 202411093442.5 (publication number CN118829022A). However, in actual use, existing electric heaters often result in the maximum temperature of the heated molten salt being far lower than the maximum temperature tested in molten salt experiments, leading to a significant difference between the heat storage capacity per unit of molten salt and the ideal value. For example, the Hitec molten salt used in engineering (composed of 50% potassium nitrate, 7% sodium nitrate, and 43% sodium nitrite) has a tested decomposition temperature of 512℃ and a theoretical safe operating temperature of 500℃. Due to the low performance of existing electric heaters, all engineering designs can only limit the upper temperature to 380-390℃. The temperature rise from 180℃ to 380℃ is only 200℃. Therefore, if the upper temperature limit could be increased to 500℃, the heat storage capacity of molten salt could be increased by more than 50%.

[0004] The main factors that prevent existing electric heaters from achieving adequate heating and temperature rise of molten salt are as follows:

[0005] Existing electric heaters consist of multiple heating elements arranged side-by-side within a tank (or tube). The tank comprises a body and flanges at both ends. Holes are drilled in the flanges to insert the heating elements, but there is a limit to the density of these holes. Even with the heating elements arranged at their maximum density (flange hole density limit), the gaps between them remain relatively large, resulting in excessive voids within the tank. Consequently, the average velocity of the molten salt inside the heater is very low, typically between 0.007 and 0.019 m / s, with the velocity at the tube wall being only one-third of the average velocity. This low velocity leads to poor heat exchange between the heating elements and the molten salt. Furthermore, in large spaces, the molten salt flow field is uneven, easily causing some areas to stagnate, creating dead zones. Additionally, the molten salt flows along the outer wall of the heating elements, making the temperature at that area prone to excessively high temperatures. Therefore, if the design temperature is set too high, in the medium and low temperature range, the molten salt's own diffusion may not cause decomposition. However, in the high temperature range, the temperature can easily exceed the lava decomposition temperature, leading to the overheating and decomposition of some molten salt. In summary, it is difficult to further improve the heat storage capacity of existing heaters. Utility Model Content

[0006] The first technical problem to be solved by this utility model is to provide a heat-conducting fluid heater with good heating effect compared with the prior art.

[0007] The second technical problem to be solved by this utility model is to provide a heat-conducting fluid heater with good heating effect and high heating efficiency, which is different from the existing technology.

[0008] The third technical problem to be solved by this utility model is to provide a heat transfer fluid heater with good heating effect and capable of heating the temperature of the heat transfer fluid to a level exceeding the design temperature of existing heaters.

[0009] The technical solution adopted by this utility model to solve at least one of the above-mentioned technical problems is as follows: a heat-conducting fluid heater, characterized in that it includes a heating unit, the heating unit including a tubular outer shell, a heat-conducting pipe passing through the outer shell along the length direction, and a heating pipe passing through the heat-conducting pipe, wherein the inner surface of the outer shell and the outer surface of the heat-conducting pipe form an annular cavity for accommodating the heat-conducting fluid in the circumferential direction, and an annular gap is left between the heat-conducting pipe and the heating pipe in the circumferential direction.

[0010] Furthermore, the annular cavity is provided with first heat-conducting fins spaced apart along its length, and these first heat-conducting fins are also spaced apart circumferentially within the annular cavity. By providing the first heat-conducting fins in the annular cavity, on the one hand, the disturbance to the flow of the heat-conducting fluid can be increased, thereby further increasing the actual flow velocity of the heat-conducting fluid and thus further improving the heat transfer capacity of the heat-conducting fluid. On the other hand, it is beneficial to achieve a uniform temperature field distribution in the flow fluid, avoiding regional flow stagnation and the generation of heat transfer dead zones.

[0011] Furthermore, at least one of the inner surface of the outer shell and the outer surface of the heat pipe is provided with the aforementioned first heat-conducting fins, thereby facilitating the arrangement of each first heat-conducting fin in the annular cavity. Preferably, the first heat-conducting fins are disposed on the outer surface of the heat pipe, which increases the external heat exchange area of ​​the heat pipe and thus improves the heat exchange efficiency of the heat transfer fluid.

[0012] Furthermore, second heat-conducting fins are provided at intervals along the length of the heat-conducting pipe on the inner surface of the annular gap, and these second heat-conducting fins are spaced apart circumferentially along the heat-conducting pipe. By adding second heat-conducting fins to the inner surface of the heat-conducting pipe, the internal heat exchange area of ​​the heat-conducting pipe can be increased, and the radiative heat exchange capacity between the heat-conducting pipe and the heating pipe can be enhanced, thereby improving the heat exchange efficiency of the heat-conducting fluid.

[0013] Furthermore, the first heat-conducting fin is integrally protruding onto the outer surface of the heat-conducting pipe. This makes the internal structure of the heating unit compact, and by adding the first and second heat-conducting fins to the two sides of the heat-conducting pipe respectively, the radiative heat transfer capacity between the heat-conducting pipe and the heating pipe, as well as the convective heat transfer capacity between the heat-conducting pipe and the heat-conducting fluid, can be fully enhanced.

[0014] Furthermore, both the outer shell and the heat pipe are positioned centered around the aforementioned heating pipe. This ensures a more uniform temperature distribution and better avoids regional flow stagnation and heat exchange dead zones.

[0015] Furthermore, the heating unit is arranged horizontally, and its outer shell has upper and lower fluid ports spaced apart along its length on its upper and lower sides for the flow of heat-conducting fluid. At least two heating units are arranged side-by-side, and in any two adjacent heating units, the lower fluid port of one unit is in fluid communication with the upper fluid port of the other. With the heating power of the heating tube and the flow area of ​​the annular cavity determined, the temperature rise of the heat-conducting fluid in a single heating unit is determined. Thus, by setting a certain number of heating units, the heat-conducting fluid can be heated to the expected temperature rise.

[0016] Furthermore, at least two of the aforementioned heating units are stacked one on top of the other to form a mounting unit, wherein the lower fluid port of each heating unit in the mounting unit is in fluid communication with the upper fluid port of another heating unit located below it.

[0017] The aforementioned installation units comprise at least three units, including a first installation unit, a second installation unit, and a third installation unit arranged side-by-side. The uppermost heating unit of the first installation unit receives inlet fluid from each of its uppermost inlets, while the lowermost heating unit of the first installation unit receives outlet fluid from each of its lowermost inlets, all of which are fluidly connected to the lowermost inlets of the second installation unit. Similarly, the uppermost heating unit of the second installation unit receives inlet fluid from each of its uppermost inlets, and the lowermost heating unit of the third installation unit receives outlet fluid from each of its lowermost inlets. Each installation unit consists of multiple heating units connected in series, with the corresponding upper and lower inlets enabling the vertical flow of the heat transfer fluid between adjacent heating units. This ensures uniform distribution and sufficient flow of the heat transfer fluid, preventing stagnant flow and dead zones, and guaranteeing a uniform temperature field distribution.

[0018] Furthermore, it also includes a storage tank for storing heat transfer fluid and located above each of the aforementioned installation units, a fluid inlet for the heat transfer fluid to flow in, and a fluid outlet for the heat transfer fluid to flow out. The outlet end of the storage tank is fluidly connected to the fluid inlet. The upper fluid ports of the heating unit at the uppermost end of one of the adjacent installation units constitute the fluid inlet, while the lower fluid ports of the heating unit at the lowermost end of the other adjacent installation unit constitute the fluid outlet or are fluidly connected to the fluid outlet, and the fluid outlet is located at the lowest point. This allows the heat transfer fluid to flow smoothly into each installation unit. By placing the fluid outlet at the lowest point, all the heat transfer fluid can be output using a low-level siphon function after heating is complete.

[0019] Furthermore, the installation units are arranged sequentially facing each other, and the lower fluid inlets of the heating units at the bottom of the side installation units are connected to vertically extending guide pipes, the lower openings of which constitute the aforementioned fluid outlets. This ensures better output of the heated heat transfer fluid.

[0020] Compared with the prior art, the advantages of this utility model are as follows: The heating unit includes a shell, a heat-conducting pipe, and a heating pipe, wherein the heat-conducting pipe surrounds the heating pipe, and the shell surrounds the heat-conducting pipe. Furthermore, the inner surface of the shell and the outer surface of the heat-conducting pipe form an annular cavity along the circumference for accommodating the heat-conducting fluid, and an annular gap is left between the heat-conducting pipe and the heating pipe along the circumference. Thus, compared with the prior art, this utility model, by adding a heat-conducting pipe between the heating pipe and the shell, ensures that the heat generated by the heating pipe is smoothly conducted to the heat-conducting fluid, while increasing the actual flow velocity of the heat-conducting fluid by reducing the flow space, thereby improving the heat exchange capacity of the heat-conducting fluid. This allows the heating temperature of the heat-conducting fluid to exceed the design temperature of existing heaters, and even reach the ideal temperature (e.g., the ideal temperature of molten salt is 500℃). In addition, the annular gap formed between the heating pipe and the heat-conducting pipe allows the heat generated by the heating pipe to be transferred more evenly to the heat-conducting pipe, thereby improving the uniformity of the temperature field in the annular cavity and further enhancing the heating effect on the heat-conducting fluid. Attached Figure Description

[0021] Figure 1 This is a front view of the thermally conductive fluid heater in an embodiment of this utility model;

[0022] Figure 2 This is a side view of the thermally conductive fluid heater in an embodiment of the present invention;

[0023] Figure 3 for Figure 1 Enlarged view of section A;

[0024] Figure 4 This is a schematic diagram of the heating unit in an embodiment of the present invention;

[0025] Figure 5 for Figure 4 A structural diagram from another direction;

[0026] Figure 6 This is an exploded view of the heating unit in an embodiment of the present invention;

[0027] Figure 7 for Figure 6 Enlarged view of section B. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0030] like Figures 1-7 As shown, a heat-conducting fluid heater includes a heating unit 1, which includes a tubular outer shell 11, a heat-conducting pipe 13 extending along its length through the outer shell 11, and a heating pipe 12 extending through the heat-conducting pipe 13. The inner surface of the outer shell 11 and the outer surface of the heat-conducting pipe 13 form a circumferentially arranged annular cavity 10 for accommodating the heat-conducting fluid (e.g., ...). Figure 3 As shown in the figure, a circumferential gap is left between the heat pipe 13 and the heating pipe 12.

[0031] As can be seen from the above, the heating unit 1 of this invention includes a shell 11, a heat-conducting pipe 13, and a heating pipe 12. The heat-conducting pipe 13 surrounds the heating pipe 12, and the shell 11 surrounds the heat-conducting pipe 13. Furthermore, the inner surface of the shell 11 and the outer surface of the heat-conducting pipe 13 form an annular cavity 10 along the circumferential direction for accommodating the heat-conducting fluid, and an annular gap is left between the heat-conducting pipe 13 and the heating pipe 12 along the circumferential direction. In this way, compared with the prior art, this invention, by adding a heat-conducting pipe 13 between the heating pipe 12 and the shell 11, ensures that the radiant heat generated by the heating pipe 12 is smoothly conducted to the heat-conducting fluid, and increases the actual flow velocity of the heat-conducting fluid by reducing the flow space of the heat-conducting fluid, thereby improving the heat exchange capacity of the heat-conducting fluid. This allows the heating temperature of the heat-conducting fluid to exceed the design temperature of existing heaters, or even reach the ideal temperature (e.g., the ideal temperature of molten salt is 500°C). Furthermore, by forming an annular gap between the heating tube 12 and the heat-conducting tube 13, the heat generated by the heating tube 12 can be transferred to the heat-conducting tube 13 more evenly, which helps to improve the uniformity of the temperature field in the annular cavity 10, and further enhances the heating effect on the heat-conducting fluid.

[0032] In this invention, the heat-conducting fluid can be at least one of molten salt or heat-conducting oil. In this embodiment, the heat-conducting fluid is specifically liquid molten salt.

[0033] Furthermore, first heat-conducting fins 131 are spaced apart along the length of the annular cavity 10, and these first heat-conducting fins 131 are spaced apart circumferentially within the annular cavity 10. By providing the first heat-conducting fins 131 in the annular cavity 10, on the one hand, the disturbance to the flow of the heat-conducting fluid can be increased, thereby further increasing the actual flow velocity of the heat-conducting fluid and further improving the heat exchange capacity of the heat-conducting fluid; on the other hand, it is beneficial to achieve a uniform temperature field distribution in the annular cavity 10, avoiding regional flow stagnation and the generation of heat exchange dead zones. Furthermore, at least one of the inner surface of the outer shell 11 and the outer surface of the heat-conducting pipe 13 is provided with the aforementioned first heat-conducting fins 131. This facilitates the arrangement of each first heat-conducting fin 131 in the annular cavity 10. Preferably, the first heat-conducting fins 131 are arranged on the outer surface of the heat-conducting pipe 13. In this way, the external heat exchange area of ​​the heat-conducting pipe 13 can be increased when the first heat-conducting fins 131 are arranged on the outer surface of the heat-conducting pipe 13, thereby improving the heat exchange efficiency of the heat-conducting fluid.

[0034] Furthermore, an annular gap is provided circumferentially between the inner surface of the heat pipe 13 and the heating pipe 12, and second heat-conducting fins 132 are spaced out along their length on the inner surface of the heat pipe 13 within this annular gap, and these second heat-conducting fins 132 are spaced out circumferentially along the heating pipe 12. By adding second heat-conducting fins 132 to the inner surface of the heat pipe 13, the internal heat exchange area of ​​the heat pipe 13 can be increased, and the radiative heat exchange capacity between the heat pipe 13 and the heating pipe 12 can be enhanced, thereby improving the heating efficiency of the heating pipe 12 and thus improving the heat exchange efficiency of the heat transfer fluid.

[0035] Preferably, the first heat-conducting fin 131 is integrally protruding onto the outer surface of the heat-conducting pipe 13, thereby making the internal structure of the heating unit 1 compact. Furthermore, by adding the first heat-conducting fin 131 and the second heat-conducting fin 132 to both sides of the heat-conducting pipe 13, the radiative heat transfer capacity between the heat-conducting pipe 13 and the heating pipe 12, as well as the convective heat transfer capacity between the heat-conducting pipe 13 and the heat-conducting fluid, can be sufficiently enhanced. In this embodiment, the heat-conducting pipe 13, the first heat-conducting fin 131, and the second heat-conducting fin 132 are integrally formed.

[0036] More preferably, the outer shell 11 and the heat pipe 13 are both arranged with the heating pipe 12 as the center, so as to better ensure the uniform distribution of the temperature field and better avoid the generation of regional flow stagnation and heat exchange dead zones.

[0037] Furthermore, the aforementioned heating unit 1 is arranged horizontally. The upper and lower sides of the outer shell 11 of the heating unit 1 are respectively provided with an upper fluid port 111 and a lower fluid port 112 for the flow of heat-conducting fluid, spaced apart along the length direction. At least two heating units 1 are arranged side-by-side, and in two adjacent heating units 1, the lower fluid port 112 of one heating unit 1 is in fluid communication with the upper fluid port 111 of the other heating unit 1. Given a fixed heating power of the heating tube 12 and a fixed flow area of ​​the annular cavity 10, the temperature rise of the heat-conducting fluid in a single heating unit 1 is determined. Thus, by setting a certain number of heating units 1, the heat-conducting fluid can be heated to the expected temperature rise (e.g., to 500°C). In this embodiment, the heating tube 12 is a quartz heating tube 12, and the heating power per meter is 6–8 kW.

[0038] Furthermore, at least two of the above-mentioned heating units 1 are stacked one on top of the other to form an installation unit, wherein the lower fluid port 112 of each heating unit 1 in the installation unit is in fluid communication with the upper fluid port 111 of another heating unit 1 located below the heating unit 1.

[0039] In this embodiment, specifically, there are three installation units, including a first installation unit 2, a second installation unit 3, and a third installation unit 4 arranged side by side. The upper fluid inlets 111 of the uppermost heating unit 1 of the first installation unit 2 supply the inflow of heat-conducting fluid, while the lower fluid inlets 112 of the lowermost heating unit 1 of the first installation unit 2 supply the outflow of heat-conducting fluid and are fluidly connected to the lower fluid inlets 112 of the lowermost heating unit 1 of the second installation unit 3. Similarly, the upper fluid inlets 111 of the uppermost heating unit 1 of the second installation unit 3 are fluidly connected to the upper fluid inlets 111 of the uppermost heating unit 1 of the third installation unit 4, and the lower fluid inlets 112 of the lowermost heating unit 1 of the third installation unit 4 supply the outflow of heat-conducting fluid. Each installation unit consists of multiple heating units 1 connected in series. The heat transfer fluid flows up and down between adjacent heating units 1 through the corresponding upper fluid port 111 and lower fluid port 112, ensuring the uniform distribution and full flow of the heat transfer fluid, eliminating regional flow stagnation and heat exchange dead zones, and ensuring the uniformity of the temperature field distribution.

[0040] Furthermore, the system also includes a storage tank 5 for storing heat transfer fluid and located above each of the aforementioned installation units, a fluid inlet 81 for the inflow of heat transfer fluid, and a fluid outlet 82 for the outflow of heat transfer fluid. The outlet end of the storage tank 5 is in fluid communication with the fluid inlet 81. The upper fluid ports 111 of the uppermost heating unit 1 of one of the adjacent installation units constitute the fluid inlet 81, while the lower fluid ports 112 of the lowermost heating unit 1 of the other adjacent installation unit constitute or are in fluid communication with the fluid outlet 82, and the fluid outlet 82 is located at the lowest point. This allows the heat transfer fluid to flow smoothly into each installation unit. By placing the fluid outlet 82 at the lowest point, all the heat transfer fluid can be output using a low-level siphon function after heating is complete. Preferably, each of the above-mentioned installation units is arranged facing each other, and each of the lower fluid ports 112 of the heating unit 1 located at the bottom of the side installation unit is connected to a vertically extending guide pipe 9. The lower port of the guide pipe 9 constitutes the above-mentioned fluid outlet 82, thereby better ensuring the output of the heat-conducting fluid after heating.

[0041] In this embodiment, specifically, the outlet end of the storage tank 5 is connected to the fluid inlet 81 through the input pipe 6, and adjacent installation units are connected through the connecting pipe 7.

[0042] The term "fluid connectivity" as used in this utility model refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A heat-conducting fluid heater, characterized in that, The heating unit (1) includes a tubular outer shell (11), a heat-conducting pipe (13) passing through the outer shell (11) along its length, and a heating pipe (12) passing through the heat-conducting pipe (13). The inner surface of the outer shell (11) and the outer surface of the heat-conducting pipe (13) form an annular cavity (10) for accommodating the heat-conducting fluid in the circumferential direction, and an annular gap is left between the heat-conducting pipe (13) and the heating pipe (12) in the circumferential direction.

2. The thermally conductive fluid heater as described in claim 1, characterized in that, The annular cavity (10) is provided with first heat-conducting fins (131) spaced apart along its own length direction, and the first heat-conducting fins (131) are spaced apart along the circumference of the annular cavity (10).

3. The thermally conductive fluid heater as described in claim 2, characterized in that, The first heat-conducting fin (131) is disposed on the outer surface of the heat-conducting pipe (13).

4. The thermally conductive fluid heater as described in claim 2, characterized in that, The annular gap contains second heat-conducting fins (132) that are spaced out along their length on the inner surface of the heat-conducting pipe (13), and the second heat-conducting fins (132) are spaced out along the circumference of the heat-conducting pipe (13).

5. The thermally conductive fluid heater as described in claim 4, characterized in that, The first heat-conducting fin (131) is integrally protruded on the outer surface of the heat-conducting pipe (13).

6. The thermally conductive fluid heater according to any one of claims 1 to 5, characterized in that, The outer shell (11) and the heat pipe (13) are both arranged with the heating pipe (12) as the center.

7. The thermally conductive fluid heater according to any one of claims 1 to 5, characterized in that, The heating unit (1) is arranged horizontally, and the upper and lower sides of the outer shell (11) of the heating unit (1) are respectively provided with an upper fluid port (111) and a lower fluid port (112) for the flow of heat-conducting fluid along the length direction. The above-mentioned heating units (1) are at least two arranged in parallel, and in two adjacent heating units (1), the lower fluid port (112) of one heating unit (1) is in fluid communication with the upper fluid port (111) of the other heating unit (1).

8. The thermally conductive fluid heater as described in claim 7, characterized in that, At least two heating units (1) are stacked one on top of the other to form an installation unit. The lower fluid port (112) of each heating unit (1) in the installation unit is in fluid communication with the upper fluid port (111) of another heating unit (1) located below the heating unit (1). The above-mentioned installation units are at least three, including a first installation unit (2), a second installation unit (3), and a third installation unit (4) arranged side by side in sequence. The upper fluid port (111) of the uppermost heating unit (1) of the first installation unit (2) is supplied with heat-conducting fluid, while the lower fluid port (112) of the lowermost heating unit (1) of the first installation unit (2) is supplied with heat-conducting fluid and is fluidly connected to the lower fluid port (112) of the lowermost heating unit (1) of the second installation unit (3). The upper fluid port (111) of the uppermost heating unit (1) of the second installation unit (3) is fluidly connected to the upper fluid port (111) of the uppermost heating unit (1) of the third installation unit (4), and the lower fluid port (112) of the lowermost heating unit (1) of the third installation unit (4) is supplied with heat-conducting fluid.

9. The thermally conductive fluid heater as described in claim 8, characterized in that, It also includes a storage tank (5) for storing heat-conducting fluid and located above each of the above-mentioned installation units, a fluid inlet (81) for the flow of heat-conducting fluid, and a fluid outlet (82) for the flow of heat-conducting fluid. The outlet end of the storage tank (5) is in fluid communication with the fluid inlet (81). The upper fluid port (111) of the heating unit (1) at the uppermost end of one of the side installation units constitutes the fluid inlet (81), while the lower fluid port (112) of the heating unit (1) at the lowermost end of the other side installation unit constitutes the fluid outlet (82) or is in fluid communication with the fluid outlet (82), and the fluid outlet (82) is located at the lowest point.

10. The thermally conductive fluid heater as described in claim 9, characterized in that, Each of the installation units is arranged in sequence facing each other, and each of the lower fluid ports (112) of the heating unit (1) located at the bottom of the installation unit on the side is connected to a vertically extending guide pipe (9), and the lower port of the guide pipe (9) constitutes the above-mentioned fluid outlet (82).

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