Comprehensive utilization system for waste heat of island mine

Abstract

The invention relates to the field of island mineral resource development and utilization, in particular to an island mine waste heat comprehensive utilization system which comprises a hot water pool used for concentrating underground hot water gushing out of the ground, a heat exchange assembly communicated with the hot water pool through a pipeline and a refrigeration assembly connected with the heat exchange assembly through a pipeline. The air conditioner assembly is connected with the refrigeration assembly through a pipeline; wherein hot water in the hot water pool enters the heat exchange assembly through a pipeline to be heated, the refrigeration assembly comprises a refrigeration unit and a cooling tower, the refrigeration assembly conducts refrigeration with the hot water heated by the heat exchange assembly as a raw material to generate low-temperature refrigerant water, the low-temperature refrigerant water enters the air conditioner assembly, and the low-temperature refrigerant water enters the air conditioner assembly. And the generated cold air enters the mine. The mine ventilation system has the effect of reducing refrigeration energy consumption required by mine ventilation.

Description

Technical Field

[0001] The present application relates to the field of development and utilization of isolated island mineral resources, and in particular to a comprehensive utilization system of waste heat from isolated island mines. Background Art

[0002] A mine is a general term for the shafts, chambers, equipment, ground buildings and structures that form an underground coal mine production system. The size of the mine field, the production capacity and service life of each mine are determined. Some isolated islands in tropical areas such as Indonesia are rich in non-ferrous metal mineral resources, and there are many submarine volcanoes. During the mining process, high-temperature groundwater often gushes out from the underground mine working surface. It is necessary to dig drainage holes in advance for drainage according to the actual water temperature.

[0003] Mine ventilation process Figure 1 As shown: fresh air flows into the mine through the air intake shaft (with large compressor air conditioning) and the main ramp (natural air flow), and enters the ramp through the air intake patio. An auxiliary fan is installed in the connecting lane between the air intake patio and the main ramp, and compressed air is sent to the mining access through the wind tube. The polluted air after flushing the working face is discharged to the surface through the ramp, return air patio, and return air shaft.

[0004] The underground water is high in temperature (average temperature 60℃, up to 95℃), and the water volume is large, which greatly increases the air temperature of the underground working surface, increases the cooling capacity required for ventilation of the entire underground mine, and increases the power consumption. These mines are located on some small islands in the tropical Pacific Ocean. There is no supporting power grid, and they can only use diesel generators to power the mine facilities, which has high electricity costs. The traditional air conditioning method of compressor refrigeration has high power consumption. Summary of the invention

[0005] In order to reduce the refrigeration energy consumption required for mine ventilation, the present application provides an isolated mine waste heat comprehensive utilization system.

[0006] This application provides a system for comprehensive utilization of waste heat from isolated mines, which adopts the following technical solutions:

[0007] A system for comprehensive utilization of waste heat from isolated island mines, comprising:

[0008] A hot water pool for collecting underground hot water gushing out from the ground, wherein the temperature of the underground hot water in the hot water pool is at least 60°C;

[0009] A heat exchange component is provided with a first pipeline for communication with the hot water tank, and hot water in the hot water tank enters the heat exchange component through the pipeline to be heated;

[0010] A refrigeration component is provided with a second pipeline for communication with the heat exchange component, including a refrigeration unit and a cooling tower, and uses the hot water heated by the heat exchange component as a raw material for refrigeration to produce low-temperature refrigerant water;

[0011] The air conditioning component is provided with a third pipeline for communication with the refrigeration component. The low-temperature refrigerant water enters the air conditioning component to generate cold air that enters the mine.

[0012] By adopting the above technical scheme, the underground hot water gushing out from the ground is concentrated in the hot water pool and heated up again by the heat exchange component, which realizes the effective recovery and utilization of the mine waste heat that might have been wasted, ensures the stability of the refrigeration component during operation, and improves the comprehensive utilization rate of energy. The waste heat is used as the power source of the refrigeration component to generate low-temperature refrigerant water for air conditioning and refrigeration, which reduces the mine's dependence on external conventional energy and saves energy costs. The air conditioning component uses the low-temperature refrigerant water generated by the refrigeration component to produce cold air and send it into the mine, which can effectively adjust the temperature in the mine, improve the hot and humid working environment underground, and ensure the safe production of mine operations.

[0013] Preferably, the heat exchange component includes a heat exchanger and a power generation device. A first water pump is provided on the first pipeline. The underground hot water enters the heat exchanger through the first water pump. The heat exchanger collects waste heat from the power generation device, and the waste heat is used to heat the underground hot water.

[0014] By adopting the above technical solution, the heat exchange component not only utilizes the heat of the underground hot water itself, but also collects the waste heat of the power generation device to further heat the underground hot water. This multi-level energy recovery method enables the system to more fully tap and utilize various potential energy resources, maximize the energy utilization efficiency of the entire mine waste heat comprehensive utilization system, and realize the effective integration of different energy forms and sources, so that energy can be more optimally configured and utilized within the system. When the temperature or flow of the underground hot water fluctuates, it can also maintain a relatively stable hot water supply by supplementing waste heat, ensuring the stable operation of subsequent heat exchange, refrigeration and other links, thereby improving the stability and reliability of the entire system.

[0015] Preferably, the heat exchanger is connected to the refrigeration component through a second pipeline, and a temperature detection device and a hot water valve are provided on the second pipeline in sequence. The temperature monitoring device is used to monitor the temperature of hot water in the heat exchanger. When the temperature in the heat exchanger reaches the required standard, the hot water valve opens.

[0016] By adopting the above technical solution, the temperature detection device can monitor the temperature of the hot water in the heat exchanger in real time, ensuring that the hot water valve is opened only when the hot water temperature reaches the required standard to allow the hot water to enter the refrigeration component, accurately controlling the quality of the hot water entering the refrigeration component, and avoiding hot water with too low a temperature entering the refrigeration component and failing to effectively drive the refrigeration process, or hot water with too high a temperature may cause damage to the refrigeration component. Through precise control, the system can use the heat of hot water for cooling at the most suitable temperature conditions, thereby optimizing energy utilization efficiency. At the same time, hot water at an appropriate temperature protects the refrigeration component equipment and extends the service life of the equipment.

[0017] Preferably, a flow meter is provided between the hot water valve and the refrigeration assembly, and the hot water valve is closed after the flow meter measures the required amount of hot water.

[0018] By adopting the above technical solution, by setting the required amount of hot water, it is ensured that only enough hot water is input each time for the efficient operation of the refrigeration component, thereby avoiding the problem of low refrigeration efficiency caused by too much or too little hot water. If the amount of hot water is too much, it may cause energy waste because the excess hot water heat cannot be effectively utilized; if the amount of hot water is too little, it may not be able to meet the working requirements of the refrigeration component, resulting in poor refrigeration effect.

[0019] Preferably, the refrigeration component uses lithium bromide as a refrigeration material, and after the underground hot water is heated by the waste heat of the power generation device, the temperature of the underground hot water is at least 90°C.

[0020] By adopting the above technical solution, when the underground hot water temperature is at least 90°C, it can provide sufficient driving heat source for lithium bromide refrigeration. Because lithium bromide refrigeration is based on the absorption-diffusion principle, higher temperature hot water can effectively drive the lithium bromide solution to absorb and regenerate the refrigerant (usually water), so that the refrigeration process can be carried out efficiently, thereby improving the refrigeration efficiency. Suitable high-temperature hot water can ensure that the lithium bromide refrigerator operates at a higher thermal coefficient, thereby enhancing its refrigeration capacity, allowing the refrigeration components to produce more low-temperature refrigerant water per unit time, and meet the cooling capacity requirements of the mine air-conditioning components.

[0021] Preferably, after the underground hot water is heated by the waste heat of the power generation component, the temperature range is 90-120°C.

[0022] By adopting the above technical solution, the lithium bromide absorption refrigerator can maintain good refrigeration performance within the heat source temperature range of 90-120°C. This temperature range can ensure that the absorption-diffusion process between the lithium bromide solution and the refrigerant is carried out efficiently and stably. Within this temperature range, the absorber and generator of the lithium bromide refrigerator can work together better, making the refrigeration cycle more efficient and able to produce more low-temperature refrigerant water at a lower temperature, providing sufficient cooling supply for the air-conditioning components, thereby more effectively regulating the temperature in the mine.

[0023] Preferably, the underground hot water generates low-temperature refrigerant water after reacting through the refrigeration component, and the low-temperature refrigerant water enters the air-conditioning component through a third pipeline.

[0024] By adopting the above technical solution, low-temperature refrigerant water is produced by the refrigeration component using the waste heat of underground hot water through processes such as lithium bromide absorption refrigeration. Its temperature is relatively low and can be directly used as a cold source by the air-conditioning component. This method avoids the energy loss that may be caused by the intermediate energy conversion process, so that the cooling effect can be efficiently transferred from the refrigeration component to the air-conditioning component, thereby improving the cooling efficiency of the entire system.

[0025] Preferably, the temperature of the low-temperature refrigerant water is 7° C. when it enters the air conditioning component.

[0026] By adopting the above technical solution, 7°C low-temperature refrigerant water can provide a strong cold source for the air-conditioning components. In the principle of air-conditioning refrigeration, when the refrigerant water with a lower temperature exchanges heat with the surrounding air, the greater the temperature difference, the faster the heat transfer rate and the more significant the cooling effect. Therefore, after the 7°C low-temperature refrigerant water enters the air-conditioning components, it can quickly absorb the heat in the air in the mine, efficiently cool the air, and create a lower temperature and cooler cold wind, thereby more effectively regulating the temperature environment in the mine.

[0027] Preferably, the cooling capacity required to be provided by the air-conditioning component needs to be calculated according to the mine space, and the amount of refrigerant water required by the air-conditioning component is calculated based on the required cooling capacity, thereby determining the required water temperature and amount of underground hot water.

[0028] By adopting the above technical solution, by accurately calculating the cooling capacity required by the air-conditioning components according to the mine space, a customized cooling solution can be provided for the mine. Different mines have different space sizes and different heat load conditions. By calculating the cooling capacity according to the actual space, it can be ensured that the cooling capacity output by the air-conditioning components can just meet the needs of adjusting the temperature in the mine to an appropriate range, avoiding the situation where the temperature cannot be lowered due to insufficient cooling capacity, or energy waste caused by excess cooling capacity.

[0029] Preferably, when the underground hot water is heated, the amount of heat to be provided by the generator waste heat is calculated based on the original temperature of the underground hot water and the hot water temperature required by the refrigeration component.

[0030] By adopting the above technical solution, by calculating the heat provided by the generator waste heat based on the original temperature of the underground hot water and the hot water temperature required by the refrigeration component, it is possible to achieve accurate utilization of the waste heat and ensure that the waste heat is not overused, thereby avoiding the situation where the hot water temperature is too high due to providing too much heat, exceeding the optimal working range of the refrigeration component and wasting energy. At the same time, the underground hot water will not reach the temperature required by the refrigeration component due to insufficient heat provided by the waste heat, and additional consumption of other energy will be required to heat it up.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. By concentrating the underground hot water that gushes out into the hot water pool and using the heat exchange component to heat it up again, the effective recycling of mine waste heat that might have been wasted is achieved, and the stability of the refrigeration component during operation is ensured, thereby improving the comprehensive utilization rate of energy. Waste heat is used as the power source of the refrigeration component to generate low-temperature refrigerant water for air conditioning and refrigeration, reducing the mine's dependence on external conventional energy and saving energy costs. The air conditioning component uses the low-temperature refrigerant water generated by the refrigeration component to create cold air and send it into the mine, which can effectively regulate the temperature in the mine, improve the hot and humid working environment underground, and ensure the safe production of mine operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of mine ventilation process in the prior art;

[0034] Figure 2 It is a flow chart of the system in the embodiment of the present application.

[0035] Explanation of the reference numerals: 1. hot water tank; 11. first pipeline; 12. first water pump; 2. heat exchange component; 21. second pipeline; 22. heat exchanger; 23. power generation device; 24. temperature detection device; 25. hot water valve; 26. flow meter; 3. refrigeration component; 31. refrigeration unit; 32. cooling tower; 4. air conditioning component; 5. mine. DETAILED DESCRIPTION

[0036] The following is combined with Figure 2 This application is described in further detail.

[0037] The present application embodiment discloses a system for comprehensive utilization of waste heat from isolated mines. Figure 2The isolated island mine waste heat comprehensive utilization system includes a hot water pool 1 for collecting underground hot water gushing out from underground, a heat exchange component 2 connected to the hot water pool 1 through a pipeline, a refrigeration component 3 connected to the heat exchange component 2 through a pipeline, and an air conditioning component 4 connected to the refrigeration component 3 through a pipeline. The hot water pool 1 is connected to the heat exchange component 2 through a first pipeline 11, the heat exchange component 2 is connected to the refrigeration component 3 through a second pipeline 21, and the air conditioning component 4 is connected to the refrigeration component 3 through a third pipeline. The hot water pool 1 collects the underground hot water generated underground through the first water pump 12 and the hot water pipeline. The temperature of the underground hot water in the hot water pool 1 is at least 60°C. In a preferred embodiment, in order to reduce the heat loss of underground hot water during transportation, the outside of the hot water pipeline is insulated. Optionally, an insulation pad is wrapped around the outside of the hot water pipeline.

[0038] The heat exchange component 2 includes a heat exchanger 22 and a power generation device 23. A first water pump 12 is provided on the first pipeline 11. The underground hot water in the hot water pool 1 enters the heat exchanger 22 through the first water pump 12. The heat exchanger 22 collects the waste heat of the power generation device 23, and the waste heat is used to heat the underground hot water. The heat exchange component 2 not only utilizes the heat of the underground hot water itself, but also collects the waste heat of the power generation device 23 to further heat the underground hot water. This multi-stage energy recovery method enables the system to more fully tap and utilize various potential energy resources, maximize the energy utilization efficiency of the entire mine waste heat comprehensive utilization system, and realize the effective integration of different energy forms and sources.

[0039] In an optional embodiment, the heat exchanger 22 is connected to the refrigeration assembly 3 through the second pipeline 21, and the second pipeline 21 is provided with a temperature monitoring device 24 and a hot water valve 25 in sequence. The temperature monitoring device is used to monitor the temperature of the hot water in the heat exchanger 22. When the temperature in the heat exchanger 22 reaches the required standard, the hot water valve 25 is opened; a flow meter 26 is also provided between the hot water valve 25 and the refrigeration assembly 3. After the flow meter 26 measures the required amount of hot water, the hot water valve 25 is closed. The coordinated work of the temperature detection device 24 and the flow meter 26 can ensure that only hot water with a temperature and flow rate that meet the optimal operating conditions of the refrigeration assembly 3 enters the refrigeration unit 31, which maximizes the energy utilization efficiency of the hot water, reduces the energy waste caused by inappropriate temperature or flow rate, enables the refrigeration assembly 3 to operate in a more stable and efficient state, ensures that the refrigerant is evaporated and condensed at a suitable temperature and pressure, improves the refrigeration coefficient, and reduces the energy consumption per unit of refrigeration capacity.

[0040] Among them, the existence of the temperature detection device 24 effectively prevents hot water with too high a temperature from entering the refrigeration component 3. Excessive temperature may damage the pipes, seals and other components in the refrigeration component 3 due to excessive thermal stress, and may even cause serious problems such as refrigerant decomposition. The hot water valve 25 is opened only when the temperature reaches the standard, providing a temperature protection barrier for the refrigeration component 3. At the same time, some refrigerants require a certain temperature to react to absorb heat and cool down, so the appropriate temperature can make the refrigerant react more fully. By accurately controlling the temperature and amount of hot water entering the refrigeration component 3, it can ensure that the refrigeration component 3 stably produces low-temperature refrigerant water. Stable low-temperature refrigerant water enables the air conditioning component 4 to continuously and stably output cold air, ensuring that the temperature in the mine 5 can be stably adjusted, avoiding the temperature fluctuations caused by the fluctuations of the refrigeration component 3, improving the reliability and availability of the system, and ensuring the continuity of the adjustment of the working environment of the mine 5.

[0041] In an optional embodiment, by collecting the waste heat of the power generation device 23 to assist in heating the underground hot water, the need for additional energy (such as electricity, other fuels, etc.) to heat the hot water to achieve the required hot water temperature can be reduced, thereby reducing the energy cost expenditure of the entire system in the hot water preparation link and saving operating expenses. When the temperature or flow of the underground hot water fluctuates, the waste heat can be supplemented to maintain a relatively stable hot water supply, ensuring the stable operation of subsequent heat exchange, refrigeration and other links, thereby improving the stability and reliability of the entire system.

[0042] In an optional embodiment, the power generation device 23 is a diesel generator. When in use, the diesel generator will generate high-temperature exhaust gas. The high-temperature exhaust gas is used to heat the underground hot water that has already reached a certain temperature, so that it is heated to a temperature within a certain range, providing a stable heat source for the subsequent refrigeration link. In a preferred embodiment, the method of heating the underground hot water to a corresponding temperature range by the exhaust gas of the diesel generator is as follows: the required cooling capacity is calculated according to the space of the mine 5, the amount of refrigerant water is calculated according to the cooling capacity, the amount of heat source water within the corresponding temperature range is calculated according to the amount of refrigerant water, and the amount of exhaust gas required by the diesel generator is determined according to the groundwater temperature and water volume taken from the ground. The heat exchanger 22 is also provided with an exhaust gas discharge pipe, which is used to discharge the exhaust gas of the diesel generator after heating the underground hot water through the exhaust gas discharge pipe.

[0043] The heat exchanger 22 is connected to the refrigeration component 3 through the second pipeline 21. In an optional embodiment, the refrigeration component 3 includes a lithium bromide refrigeration unit 31 and a condensing tower used in conjunction with the lithium bromide refrigeration unit 31. Optionally, the underground hot water has a temperature of at least 90°C when it passes through the heat exchanger 22 and enters the lithium bromide refrigeration unit 31. When the underground hot water temperature is at least 90°C, it can provide sufficient driving heat source for lithium bromide refrigeration, because lithium bromide refrigeration is based on the absorption-diffusion principle. Hot water with a higher temperature can effectively drive the lithium bromide solution to absorb and regenerate the refrigerant (usually water), so that the refrigeration process can be carried out efficiently, thereby improving the refrigeration efficiency. Suitable high-temperature hot water can ensure that the lithium bromide refrigerator operates at a higher thermal coefficient, thereby enhancing its refrigeration capacity, so that the refrigeration component 3 produces more low-temperature refrigerant water per unit time, and meets the demand for cooling capacity of the air conditioning component 4 of the mine 5.

[0044] In a preferred embodiment, the temperature range of groundwater is 90-120°C. Compared with heat sources with lower temperatures, hot water at 90-120°C can significantly improve the thermal coefficient of lithium bromide refrigerators. Since the temperature of waste heat may fluctuate due to factors such as the operating status and load of power generation equipment, the temperature range of 90-120°C provides a certain buffer space for the effective utilization of waste heat. As long as the waste heat can heat the groundwater to this range, the lithium bromide refrigeration process can be driven well, reducing the situation where the waste heat temperature cannot be effectively utilized due to instability. Through reasonable heat exchange and heat allocation, the groundwater temperature is maintained at 90-120°C, which can ensure that both waste heat resources can be fully utilized, avoiding the situation where one heat resource is overused and the other is wasted. If the temperature exceeds 120°C, it may have an adverse effect on the material properties of lithium bromide refrigeration equipment, such as causing problems such as increased pipeline corrosion and aging of sealing materials.

[0045] In an optional embodiment, when the lithium bromide refrigeration unit 31 reacts for the first time, the refrigerant water produced is 12°C. After cooling through the condensing tower, the refrigerant water is cooled to 7°C. The underground hot water reacts through the refrigeration component 3 to produce low-temperature refrigerant water, which enters the air-conditioning component 4 through the third pipeline. The temperature of the low-temperature refrigerant water when entering the air-conditioning component 4 is 7°C. The low-temperature refrigerant water is produced by the refrigeration component 3 using the waste heat of underground hot water through lithium bromide absorption refrigeration and other processes. Its temperature is relatively low and can be directly used as a cold source by the air-conditioning component 4. This method avoids the energy loss that may be caused by the intermediate energy conversion process, so that the refrigeration effect can be efficiently transferred from the refrigeration component 3 to the air-conditioning component 4, thereby improving the refrigeration efficiency of the entire system. The cold air generated by the air-conditioning component 4 enters the mine 5, providing a good working environment for the mine 5.

[0046] The implementation principle of the embodiment of the present application is as follows: by concentrating the underground hot water gushing out from the ground into the hot water pool 1 and reheating it by using the heat exchange component 2, the effective recycling of the mine waste heat that might have been wasted is achieved, and the stability of the refrigeration component 3 during operation is ensured, thereby improving the comprehensive utilization rate of energy. Waste heat is used as the power source of the refrigeration component 3 to generate low-temperature refrigerant water for air-conditioning refrigeration, thereby reducing the mine's dependence on external conventional energy and saving energy costs. The air-conditioning component 4 uses the low-temperature refrigerant water generated by the refrigeration component 3 to produce cold air and send it into the mine 5, which can effectively adjust the temperature in the mine 5, improve the hot and humid working environment underground, and ensure the safe production of the mine 5.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A system for comprehensive utilization of waste heat from isolated island mines, characterized in that: include: A hot water pool (1) for collecting underground hot water gushing out from underground, wherein the temperature of the underground hot water in the hot water pool (1) is at least 60°C; A first pipeline (11) for communication is provided between the heat exchange component (2) and the hot water pool (1); hot water in the hot water pool (1) enters the heat exchange component (2) through the first pipeline (11) to be heated; A refrigeration component (3) is provided with a second pipeline (21) for communication with the heat exchange component (2), comprising a refrigeration unit (31) and a cooling tower (32), and uses the heated hot water of the heat exchange component (2) as a raw material for refrigeration to produce low-temperature refrigerant water; The air conditioning component (4) is provided with a third pipeline for communication with the refrigeration component (3), and the low-temperature refrigerant water enters the air conditioning component (4) to generate cold air that enters the mine (5).

2. The isolated island mine waste heat comprehensive utilization system according to claim 1 is characterized by: The heat exchange component (2) comprises a heat exchanger (22) and a power generation device (23); a first water pump (12) is provided on the first pipeline (11); underground hot water enters the heat exchanger (22) through the first water pump (12); the heat exchanger (22) collects waste heat from the power generation device (23); and the waste heat is used to heat the underground hot water.

3. The isolated island mine waste heat comprehensive utilization system according to claim 2 is characterized by: The heat exchanger (22) is connected to the refrigeration component (3) via a second pipeline (21). A temperature monitoring device (24) and a hot water valve (25) are provided on the second pipeline (21) in sequence. The temperature monitoring device is used to monitor the temperature of hot water in the heat exchanger (22). When the temperature in the heat exchanger (22) reaches a required standard, the hot water valve (25) opens.

4. The isolated island mine waste heat comprehensive utilization system according to claim 3 is characterized by: A flow meter (26) is also provided between the hot water valve (25) and the refrigeration assembly (3); after the flow meter (26) measures the required amount of hot water, the hot water valve (25) is closed.

5. The isolated island mine waste heat comprehensive utilization system according to claim 2 is characterized by: The refrigeration component (3) uses lithium bromide as a refrigeration material, and after the underground hot water is heated by the waste heat of the power generation device (23), the temperature of the underground hot water is at least 90°C.

6. The isolated island mine waste heat comprehensive utilization system according to claim 5 is characterized by: After the underground hot water is heated by the waste heat of the power generation component, the temperature ranges from 90 to 120°C.

7. The isolated island mine waste heat comprehensive utilization system according to claim 6 is characterized by: The underground hot water generates low-temperature refrigerant water after reacting in the refrigeration component (3), and the low-temperature refrigerant water enters the air conditioning component (4) through the third pipeline.

8. The isolated island mine waste heat comprehensive utilization system according to claim 7 is characterized by: The temperature of the low-temperature refrigerant water when entering the air conditioning component (4) is 7°C.

9. The isolated island mine waste heat comprehensive utilization system according to claim 8 is characterized by: The cooling capacity required to be provided by the air conditioning component (4) needs to be calculated based on the space of the mine (5), and the amount of refrigerant water required by the air conditioning component (4) is calculated based on the required cooling capacity, thereby determining the required water temperature and water volume of the underground hot water.

10. The isolated island mine waste heat comprehensive utilization system according to claim 9 is characterized in that: When the underground hot water is heated, the amount of heat to be provided by the generator waste heat is calculated based on the original temperature of the underground hot water and the hot water temperature required by the refrigeration component (3).

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