Terrestrial heat utilization system

Abstract

The utility model discloses a terrestrial heat utilization system which comprises a prefabricated terrestrial heat plate and a heat pump circulation system, the heat pump circulation system is arranged on the prefabricated terrestrial heat plate, and the heat pump circulation system comprises a four-way electromagnetic valve, a pipeline and a temperature changing device, a throttling valve and a four-way electromagnetic valve are installed on a pipeline on the prefabricated geothermal plate through pipelines, temperature changing equipment is installed on the pipeline between the throttling valve and the four-way electromagnetic valve, and a compressor is installed on the four-way electromagnetic valve. According to the terrestrial heat utilization system, the wall-mounted prefabricated terrestrial heat plate for enhancing heat exchange is arranged in the underground space and coupled to the heat pump circulating system to serve as a cold / heat source heat exchanger, and cold / heat energy of the urban underground space is fully collected and used for indoor temperature adjustment of an overground building; solid heat conduction and fluid heat transfer in the whole heat pump system are enhanced by adopting a nano heat conduction material and a nano particle fluid working medium.

Description

Technical Field

[0001] This utility model relates to the field of geothermal panel technology, specifically a geothermal utilization system. Background Technology

[0002] Geothermal energy, as a non-carbon-based and renewable energy source, is clean, sustainable, widely distributed, and emits no carbon dioxide. The best way to utilize geothermal energy is through the installation of prefabricated geothermal panels. These panels can transform underground structures (such as parking lots or tunnels) into a source of renewable heat energy, directly heating and cooling buildings and saving carbon dioxide. Furthermore, these prefabricated geothermal panels offer advantages such as operation unaffected by external weather conditions, wide applicability to existing buildings, convenient and quick installation, and easy maintenance. They are widely used in underground areas such as underground parking lots, underground tunnels, and subway stations.

[0003] For example, a geothermal heating board for underfloor heating with publication number CN109898788A uses high-strength active powder fiber concrete as the substrate, which reduces the consumption of wood materials and gives the geothermal floor excellent thermal conductivity, fire resistance, and moisture resistance, as well as low energy consumption and low shrinkage.

[0004] The aforementioned geothermal panels can achieve a moderate indoor temperature in winter. The geothermal floor heats the room through ground radiation, resulting in a uniform indoor temperature. However, since the underground temperature is higher than the ground temperature in winter, the geothermal panels provide heat through ground radiation, and the underground temperature is not utilized. Furthermore, this geothermal panel is only suitable for winter; it cannot be used when the weather is warm. Utility Model Content

[0005] The purpose of this utility model is to provide a geothermal utilization system to solve the problems mentioned in the background art above, where geothermal panels on the market achieve heating through ground radiation, without utilizing underground temperature, and the geothermal panels are only applicable in winter and cannot be used when the weather temperature is high.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a geothermal utilization system, comprising a prefabricated geothermal panel and a heat pump circulation system. The heat pump circulation system is installed on the prefabricated geothermal panel and includes a four-way solenoid valve for switching the fluid direction, pipelines, and a temperature-changing device. The pipelines on the prefabricated geothermal panel are equipped with a throttling valve and a four-way solenoid valve. The temperature-changing device is installed on the pipeline between the throttling valve and the four-way solenoid valve. A compressor is installed on the four-way solenoid valve.

[0007] Preferably, the temperature-changing device is connected to a circulating water pump via a pipe, the circulating water pump is connected to a radiator via a pipe, a second circulating water valve is installed on the pipe between the circulating water pump and the radiator, and the output end of the radiator is connected to the temperature-changing device via a pipe.

[0008] Preferably, the output end of the circulating water pump is connected to the heat exchanger via a pipe, a cold air fan is installed on the side of the heat exchanger, a first circulating water valve is installed between the heat exchanger and the circulating water pump, and the output end of the heat exchanger is connected to both the radiator and the temperature-changing device via a pipe.

[0009] Preferably, the variable temperature device includes a condenser and an evaporator, which are connected in parallel.

[0010] The prefabricated geothermal panel includes a new type of thermally conductive silicone grease applied to the position where it is in close contact with the wall of the underground space. A base plate is installed on the back of the prefabricated geothermal panel, and pipes are welded on the base plate. A decorative panel is installed on the outside of the pipes. Expansion bolts are used to fix the corners of the prefabricated geothermal panel to the wall of the underground space.

[0011] Preferably, the pipeline is a parallel serpentine pipe structure, the inside of the pipeline is filled with nano heat exchange fluid, and hexagonal positioning pins and countersunk screws are installed between the decorative panel and the prefabricated geothermal panel, with connecting bolts installed on the countersunk screws.

[0012] Preferably, the pipeline is a closed trench structure, with thermometers installed at the inlet and outlet of the pipeline and a flow meter installed at the outlet of the pipeline.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. By placing wall-mounted prefabricated geothermal panels with enhanced heat exchange in underground spaces and coupling them with a heat pump cycle system as a cold / heat source heat exchanger, the cold / heat energy of urban underground spaces is fully collected and used for indoor temperature regulation of above-ground buildings. Nano-thermal conductive materials and nano-particle fluid working fluids are used to enhance solid heat conduction and fluid heat transfer in the entire heat pump system. This has important engineering application value and certain scientific research value for urban low-carbon and building energy conservation.

[0015] 2. A decorative panel is installed on the outermost side of the geothermal panel. The decorative panel makes the prefabricated geothermal panel assembly neater and more beautiful. Its outer surface can be used for advertising space rental, which has additional commercial value. The geothermal panel can use the underground temperature to achieve cooling or heating. The geothermal panel can be used in both summer and winter, which greatly improves the utilization rate of the geothermal panel. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the circulation system of this utility model;

[0017] Figure 2This is a schematic diagram of the internal passage of the electromagnetic four-way valve of this utility model;

[0018] Figure 3 This is a schematic diagram of the main view of the prefabricated geothermal panel of this utility model;

[0019] Figure 4 This is a top sectional view of the prefabricated geothermal panel of this utility model;

[0020] Figure 5 This is an isometric view of the prefabricated geothermal panel after the decorative panel has been removed.

[0021] Figure 6 This is a schematic diagram of the closed groove structure of this practical application.

[0022] In the diagram: 1. Prefabricated geothermal panel; 2. Throttling valve; 3. Temperature control device; 4. Four-way solenoid valve; 5. Compressor; 6. Circulating water pump; 7. First circulating water valve; 8. Air cooler; 9. Heat exchanger; 10. Second circulating water valve; 11. Radiator; 12. Laboratory room; 13. Wall; 14. Underground space; 15. Base plate; 16. Piping; 161. Enclosed groove; 17. Decorative panel; 18. Connecting bolt; 19. Countersunk screw; 20. Hexagonal locating pin; 21. Nano heat exchange fluid; 22. Flow meter; 23. Thermometer. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-6 The present invention provides the following technical solution:

[0025] Example 1: This geothermal utilization system uses a refrigeration cycle. This example is suitable for use in summer. Figure 1 As shown, a geothermal utilization system is installed in the experimental room 12. The geothermal utilization system includes a prefabricated geothermal panel 1 and a heat pump circulation system. The heat pump circulation system is installed on the prefabricated geothermal panel 1 and includes a four-way solenoid valve 4 for switching the fluid direction, a pipeline 16, and a temperature-changing device 3. The pipeline 16 on the prefabricated geothermal panel 1 is equipped with a throttling valve 2 and a four-way solenoid valve 4. The temperature-changing device 3 is installed on the pipeline between the throttling valve 2 and the four-way solenoid valve 4. A compressor 5 is installed on the four-way solenoid valve 4.

[0026] The variable temperature device 3 is connected to the circulating water pump 6 through a pipe, the circulating water pump 6 is connected to the radiator 11 through a pipe, a second circulating water valve 10 is installed on the pipe between the circulating water pump 6 and the radiator 11, and the output end of the radiator 11 is connected to the variable temperature device 3 through a pipe.

[0027] The output end of the circulating water pump 6 is connected to the heat exchanger 9 through a pipe. A cooler 8 is installed on the side of the heat exchanger 9. A first circulating water valve 7 is installed between the heat exchanger 9 and the circulating water pump 6. The output end of the heat exchanger 9 is connected to the radiator 11 and the temperature-changing device 3 through a pipe.

[0028] In summer, the evaporator is turned on and the condenser is turned off. The fluid condenses and releases heat through the prefabricated geothermal plate 1 and is then throttled by the expansion valve 2. The low-pressure fluid enters the variable temperature device 3 to absorb heat from the circulating water and evaporate. It is then switched to the E→S path by the four-way solenoid valve 4, enters the compressor 5 for compression, and then enters the prefabricated geothermal plate 1 in the underground space 14 again through the D→C path to release heat. After the circulating water releases heat through the variable temperature device 3, it enters the heat exchanger 9 through the first circulating water valve 7. At this time, the second circulating water valve 10 is closed, and the air cooler 8 forces air convection, introducing air into the heat exchanger 9 for cooling. After cooling, the cold air is blown out.

[0029] Example 2 differs from Example 1 in that the direction of fluid flow in the heat pump circulation system is changed, the evaporator is shut off, and the condenser is opened. This example is suitable for use in winter. Figure 2 As shown, after the fluid absorbs heat through evaporation in the prefabricated geothermal panel 1, it enters the four-way solenoid valve 4. The four-way solenoid valve 4 switches to the C→S path, enters the compressor 5 for compression, and then enters the temperature-changing device 3 through the D→E path to release heat. After the circulating water releases heat through the temperature-changing device 3, it is pressurized by the circulating water pump 6 and enters the radiator 11 through the second circulating water valve 10 to dissipate heat in the room. At this time, the first circulating water valve 7 is closed, and after the circulating water dissipates heat, it flows out from the radiator 11 and enters the temperature-changing device 3 to continue the next cycle of heat absorption.

[0030] Example 3: This example discloses the specific structure of the prefabricated geothermal panel 1. The prefabricated geothermal panel 1 includes a novel thermally conductive silicone grease applied at the position where it is in close contact with the wall 13 of the underground space 14. This prevents the prefabricated geothermal panel 1 from falling off the wall 13 after a long period of time and can also be used to create an air gap between the prefabricated geothermal panel 1 and the wall 13, reducing thermal resistance. Moreover, the novel thermally conductive silicone grease has a high thermal conductivity and can create a heat transfer between the prefabricated geothermal panel 1 and the wall 13.

[0031] A base plate 15 is installed on the back of the prefabricated geothermal panel 1. Pipes 16 are welded on the base plate 15. A decorative panel 17 is installed on the outside of the pipes 16. Expansion bolts are used to fix the corners of the prefabricated geothermal panel 1 to the wall 13 of the underground space 14. The decorative panel 17 serves to protect the pipes 16 and for aesthetic decoration.

[0032] Pipes 16 are welded onto the base plate 15. They can be tightly fitted by welding to avoid gaps between the outer wall of the pipes 16 and the prefabricated geothermal plate 1, which would result in excessive thermal resistance.

[0033] Pipeline 16 has a parallel serpentine structure. The inside of pipeline 16 is filled with nano heat exchange fluid 21. Hexagonal positioning pins 20 and countersunk screws 19 are installed between decorative panel 17 and prefabricated geothermal plate 1. Connecting bolts 18 are installed on countersunk screws 19. Nanoscale particles are added to nano heat exchange fluid 21.

[0034] The nano heat exchange fluid 21 has a strong boundary layer disruption capability, resulting in good heat transfer effect on the surface of the heat exchanger 9 and low flow resistance. Due to the addition of nano-sized particles in the nano heat exchange fluid 21, a sliding friction effect can be formed on the solid contact boundary, which has lubrication characteristics.

[0035] The fluid inlet and outlet can be selected and set at the upper, middle and lower parts of the component according to the actual working conditions of multiple series. The pipe 16 is a closed groove 161 structure. The inlet and outlet of the pipe 16 are equipped with thermometers 23, and the outlet of the pipe 16 is equipped with a flow meter 22 to facilitate monitoring the temperature in the geothermal panel. The arrangement of the prefabricated geothermal panels 1 can be optimized and adjusted according to the actual installation position of the prefabricated geothermal panels 1 and the ambient temperature to maximize the utilization of geothermal energy.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A geothermal utilization system, comprising prefabricated geothermal panels (1) and a heat pump circulation system, characterized in that, The heat pump circulation system is set on the prefabricated geothermal panel (1). The heat pump circulation system includes a four-way solenoid valve (4) for switching the fluid direction, a pipeline (16) and a temperature-changing device (3). The pipeline (16) on the prefabricated geothermal panel (1) is equipped with a throttle valve (2) and a four-way solenoid valve (4) through the pipe. The temperature-changing device (3) is installed on the pipeline between the throttle valve (2) and the four-way solenoid valve (4). A compressor (5) is installed on the four-way solenoid valve (4).

2. The geothermal utilization system according to claim 1, characterized in that: The temperature-changing device (3) is connected to the circulating water pump (6) through a pipe. The circulating water pump (6) is connected to the radiator (11) through a pipe. A second circulating water valve (10) is installed on the pipe between the circulating water pump (6) and the radiator (11). The output end of the radiator (11) is connected to the temperature-changing device (3) through a pipe.

3. A geothermal utilization system according to claim 2, characterized in that: The output end of the circulating water pump (6) is connected to the heat exchanger (9) through a pipe. A cold air fan (8) is installed on the side of the heat exchanger (9). A first circulating water valve (7) is installed between the heat exchanger (9) and the circulating water pump (6). The output end of the heat exchanger (9) is connected to the radiator (11) and the temperature-changing device (3) through a pipe.

4. A geothermal utilization system according to claim 2, characterized in that: The variable temperature device (3) includes a condenser and an evaporator, which are connected in parallel.

5. A geothermal utilization system according to claim 2, characterized in that: The prefabricated geothermal panel (1) includes a new type of thermally conductive silicone grease applied to the wall (13) of the underground space (14) in close contact with it. A base plate (15) is installed on the back of the prefabricated geothermal panel (1). Pipes (16) are welded on the base plate (15). A decorative panel (17) is provided on the outside of the pipes (16). Expansion bolts are used to fix the corners of the prefabricated geothermal panel (1) to the wall (13) of the underground space (14).

6. A geothermal utilization system according to claim 5, characterized in that: The pipeline (16) is a parallel serpentine pipe structure. The pipeline (16) is filled with nano heat exchange fluid (21). Hexagonal positioning pins (20) and countersunk screws (19) are installed between the decorative panel (17) and the prefabricated geothermal plate (1). Connecting bolts (18) are installed on the countersunk screws (19).

7. A geothermal utilization system according to claim 5, characterized in that: The pipeline (16) is a closed groove (161) structure. The inlet and outlet of the pipeline (16) are equipped with thermometers (23), and the outlet of the pipeline (16) is equipped with a flow meter (22).

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