Geothermal energy vertical heat conduction system and control method

Abstract

The invention discloses a geothermal energy vertical heat conduction system and a control method, and relates to the technical field of geothermal application, and the geothermal energy vertical heat conduction system comprises a medium circulation loop which comprises a steam guide channel, an underground heat exchange assembly, a liquid injection channel and an overground heat exchange assembly which are sequentially connected in series and closed, and the medium circulation loop is filled with a heat exchange medium; the underground heat exchange assembly is used for exchanging heat with underground heat energy, and the overground heat exchange assembly is used for exchanging heat with an overground load module; the vacuum pump assembly communicates with the medium circulation loop and is used for forming negative pressure in the underground heat exchange assembly; according to the geothermal energy vertical heat conduction system and the control method, the pressure in the medium circulation loop and / or the underground heat exchange assembly is reduced through the vacuum pump assembly, then the boiling point of the heat exchange medium is reduced, the heat exchange medium is accelerated to be converted into the gas state from the liquid state, heat is carried to float to the ground surface through the steam guide channel, and the geothermal energy collection efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geothermal application, more particularly, to a vertical heat conduction system of geothermal energy. BACKGROUND

[0002] The geothermal system is to collect underground heat and transmit the underground heat to the ground surface through a circulating heat exchange medium for heat exchange use of a load device on the ground. In the prior art, the heat exchange medium is mainly water injection heat exchange, that is, low-temperature circulating water is injected into the underground to exchange heat with the underground heat source, and then the high-temperature circulating water after underground heat exchange is pumped to the ground surface by a water pump to exchange heat with the load device on the ground, thereby realizing the utilization of underground heat.

[0003] However, in actual use, the high-temperature circulating water needs to be pumped back to the ground surface, which requires a large energy consumption. Moreover, for a deep heat source (3000 meters), a large-head water pump is needed to pump back the high-temperature circulating water, which has a high cost. Therefore, a steam heat exchange method is derived, that is, a liquid heat exchange medium is injected into the underground to exchange heat with the underground heat source, so that the heat exchange medium is vaporized, and the vaporized heat exchange medium is pumped back to the ground surface to exchange heat with the load device on the ground, thereby reducing the dependence on the large-head pump. However, when the system is running, the liquid state of the heat exchange medium in the underground heat exchange assembly is converted to the gas state slowly, that is, there is less high-temperature gaseous heat exchange medium that can carry heat and be pumped back to the ground surface, thereby causing the overall geothermal collection efficiency of the system to be low, that is, the load device on the ground cannot output effective heat energy.

[0004] In summary, how to solve the problem of low conversion efficiency of the liquid heat exchange medium in the underground heat exchange assembly from the liquid state to the gas state, which causes the overall geothermal collection efficiency of the system to be low, is a problem that needs to be solved by the technical personnel in the field. SUMMARY

[0005] Therefore, the present application aims to provide a vertical heat conduction system of geothermal energy, which reduces the pressure in the medium circulation loop and / or the underground heat exchange assembly through a vacuum pump assembly, thereby reducing the boiling point of the heat exchange medium, accelerating the conversion of the heat exchange medium from the liquid state to the gas state, and then carrying heat to float to the ground surface through the steam guide channel, thereby improving the collection efficiency of geothermal energy.

[0006] The second object of the present application is to provide a control method for controlling the vertical heat conduction system of geothermal energy, which monitors the pressure in the medium circulation loop and / or the underground heat exchange assembly in real time, so as to maintain a negative pressure state, reduce the boiling point of the heat exchange medium, accelerate the conversion of the heat exchange medium from the liquid state to the gas state, and then improve the overall geothermal collection efficiency of the system.

[0007] The third object of the present application is to provide a control method for controlling the above-mentioned geothermal energy vertical heat conduction system, which can monitor the temperature of the heat transfer medium in real time and make the ground load device provide stable heat output through the cooperation of the heating assembly, the vacuum pump assembly and the fan assembly.

[0008] In order to achieve the above-mentioned objects, the present application provides the following technical solutions:

[0009] A geothermal energy vertical heat conduction system comprises:

[0010] A medium circulation loop, which comprises a steam guide channel, a ground heat exchange assembly, a liquid injection channel and a ground heat exchange assembly connected in series and in a closed loop, and is filled with heat transfer medium inside; the ground heat exchange assembly is used for heat exchange with a ground heat source, and the ground heat exchange assembly is used for heat exchange with a ground load module;

[0011] A vacuum pump assembly, which is in communication with the medium circulation loop and is used for forming negative pressure in the ground heat exchange assembly.

[0012] Preferably, the steam guide channel is vertically arranged and is connected in series with a plurality of fan assemblies, which are used for driving the steam in the steam guide channel to float upwards.

[0013] Preferably, the geothermal energy vertical heat conduction system further comprises an equipment maintenance room, and the fan assembly is arranged in the equipment maintenance room.

[0014] The fan assembly is detachably mounted with the steam guide channel.

[0015] Preferably, the steam guide channel is provided with a heat preservation layer, which is used for reducing heat leakage in the channel.

[0016] Preferably, the liquid injection channel is vertically arranged and is connected in series with a downwardly guiding one-way valve assembly.

[0017] The upper end inlet of the liquid injection channel is in communication with the lowest point of the ground heat exchange assembly.

[0018] Preferably, the geothermal energy vertical heat conduction system further comprises a heating assembly, which is used for directly heating the heat transfer medium in the ground load module.

[0019] Preferably, the ground heat exchange assembly comprises a heat exchange pipe made of a high-thermal-conductivity material.

[0020] And / or, the ground heat exchange assembly and / or the ground heat exchange assembly comprises a plurality of groups of heat conduction fins for improving the heat exchange efficiency.

[0021] Preferably, the geothermal energy vertical heat conduction system further comprises a pressure transmitting assembly and / or a temperature transmitting assembly.

[0022] The pressure transmitting assembly is used for acquiring pressure data in the medium circulation loop and / or the underground heat exchange assembly.

[0023] The temperature transmitting assembly is used for acquiring temperature data of the heat transfer medium in the aboveground load module.

[0024] A control method for controlling the geothermal energy vertical heat conduction system, comprising:

[0025] Acquiring pressure data P in the medium circulation loop and / or the underground heat exchange assembly, and determining whether P is less than a preset pressure P0;

[0026] If not, controlling the vacuum pump assembly to start until P < P0;

[0027] If not, returning to the step of acquiring the pressure P.

[0028] A control method for controlling the geothermal energy vertical heat conduction system, wherein the steam guide channel is connected with a plurality of fan assemblies, comprising:

[0029] Acquiring temperature T of the heat transfer medium in the aboveground load device, and determining whether T is less than a preset temperature T0;

[0030] If yes, controlling the heating assembly to work until T > T0,

[0031] If not, determining whether T is greater than a second preset temperature T1;

[0032] If yes, controlling the vacuum pump assembly to stop working and / or controlling the fan assembly to reduce power until T < T1;

[0033] If not, returning to the step of acquiring the temperature T.

[0034] The geothermal energy vertical heat conduction system provided by the application has at least the following beneficial effects compared with the prior art:

[0035] Through the working of the vacuum pump assembly, the medium circulation loop and / or the underground heat exchange assembly are in negative pressure, the boiling point of the heat transfer medium inside is reduced, and then the heat transfer medium can be converted from liquid to gas by absorbing less heat, and is sucked to the aboveground heat exchange assembly in the form of steam through the steam guide channel, more heat conduction carriers are circulated between the underground heat source and the aboveground load module by increasing the amount of vaporized heat transfer medium, and then the collection efficiency of geothermal energy is improved and the effective output heat energy of the aboveground load device is increased.

[0036] The control method for controlling the geothermal energy vertical heat conduction system provided by the application has at least the following beneficial effects compared with the prior art:

[0037] Real-time monitoring of the pressure in the medium circulation loop and / or the underground heat exchange assembly, when the pressure exceeds the preset pressure, the vacuum pump assembly is started, so that the medium circulation loop and / or the underground heat exchange assembly always maintains negative pressure, even when the heat exchange medium exchanges heat with the underground heat source, always has a low boiling point, effectively increases the vaporization of the heat exchange medium.

[0038] The control method provided by the present application is used for controlling the geothermal energy vertical heat conduction system, and at least has the following beneficial effects compared with the prior art:

[0039] When the temperature of the heat transfer medium is lower than the lower limit temperature of the temperature output interval, auxiliary heating is performed through the heating assembly, when the temperature of the heat transfer medium is higher than the upper limit temperature of the temperature output interval, the vacuum pump assembly is stopped to work, and the frequency of the fan assembly is reduced to reduce the vaporization efficiency of the heat exchange medium and the steam floating speed in the steam guide channel, so that the temperature of the heat transfer medium can be stabilized in the temperature output interval, and the ground load device can provide stable heat output. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0041] Figure 1 The structural schematic diagram of the specific geothermal energy vertical heat conduction system embodiment one provided by the present application is shown in the figure.

[0042] Figure 2 The structural schematic diagram of the specific geothermal energy vertical heat conduction system embodiment two provided by the present application is shown in the figure.

[0043] In the figure:

[0044] 1, steam guide channel; 2, underground heat exchange assembly; 3, liquid injection channel; 4, ground heat exchange assembly; 5, heating assembly; 6, fan assembly; 7, vacuum pump assembly; 8, one-way valve assembly; 9, pressure transmission assembly; 10, temperature transmission assembly. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0046] The core of the present application is to provide a geothermal energy vertical heat conduction system, which reduces the pressure in the medium circulation loop and / or the underground heat exchange assembly through a vacuum pump assembly, thereby reducing the boiling point of the heat exchange medium, accelerating the conversion of the heat exchange medium from liquid to gas, and then carrying the heat to the ground surface through the steam guide channel, thereby improving the collection efficiency of geothermal energy.

[0047] The second core of the present application is to provide a control method for controlling the above-mentioned geothermal energy vertical heat conduction system, which monitors the pressure in the medium circulation loop and / or the underground heat exchange assembly in real time, maintains a negative pressure state, reduces the boiling point of the heat exchange medium, accelerates the conversion of the heat exchange medium from liquid to gas, and thereby improves the overall geothermal collection efficiency of the system.

[0048] The third core of the present application is to provide a control method for controlling the above-mentioned geothermal energy vertical heat conduction system, which monitors the temperature of the heat transfer medium in real time, and through the coordinated work of the heating assembly, vacuum pump assembly and fan assembly, the above-ground load device can provide stable heat output.

[0049] Please refer to Figure 1 and Figure 2 , a geothermal energy vertical heat conduction system, comprising:

[0050] A medium circulation loop comprising a steam guide channel 1, an underground heat exchange assembly 2, a liquid injection channel 3 and an above-ground heat exchange assembly 4 connected in series and closed loop, and the medium circulation loop is filled with heat exchange medium; the underground heat exchange assembly 2 is used for heat exchange with the underground heat source, and the above-ground heat exchange assembly 4 is used for heat exchange with the above-ground load module;

[0051] A vacuum pump assembly 7 in communication with the medium circulation loop for forming a negative pressure in the underground heat exchange assembly 2.

[0052] As shown in Figure 1 and Figure 2 , the steam guide channel 1, the underground heat exchange assembly 2, the liquid injection channel 3 and the above-ground heat exchange assembly 4 are connected in series to form a closed loop, and the underground heat exchange assembly 2 is arranged at the position of the underground heat source to exchange heat with the underground heat source, so that the heat exchange medium inside is vaporized, then the high-temperature steam rises to the above-ground heat exchange assembly 4 through the steam guide channel 1, the above-ground heat exchange assembly 4 exchanges heat with the heat transfer medium in the above-ground load device, and then the high-temperature steam in the above-ground heat exchange assembly 4 is liquefied by heat release, and the liquefied low-temperature liquid flows back to the underground heat exchange assembly 2 through the liquid injection channel 3 to be vaporized again, completing the circulation of the heat exchange medium in the medium circulation loop.

[0053] During the circulation of the heat exchange medium, the vacuum pump assembly 7 works to draw negative pressure in the medium circulation loop and / or the underground heat exchange assembly 2, so that the heat exchange medium is in a negative pressure environment, the boiling point of the heat exchange medium is reduced, and then the vaporization of the heat exchange medium is accelerated. The vaporized heat exchange medium can float to the ground under the action of its own buoyancy and enter the ground heat exchange assembly 4 for heat release, thereby improving the efficiency of geothermal energy collection.

[0054] In some embodiments, the steam guide channel 1 is vertically arranged and is connected in series with a plurality of fan assemblies 6 for driving the steam in the steam guide channel 1 to float upward.

[0055] The vertical arrangement of the steam guide channel 1 helps the vaporized heat exchange medium to float upward quickly. In addition, the series connection of the fan assembly 6 in the steam guide channel 1 can accelerate the upward floating of the vaporized heat exchange medium. At the same time, a negative pressure area is formed below the fan assembly 6, which forces the gas in the underground heat exchange assembly 2 to flow into the steam guide channel 1, further reduces the air pressure in the underground heat exchange assembly 2, further reduces the boiling point of the heat exchange medium in the underground heat exchange assembly 2, and accelerates the vaporization efficiency of the heat exchange medium.

[0056] In some embodiments, the vertical geothermal energy heat conduction system further comprises a device maintenance bin, and the fan assembly 6 is arranged in the device maintenance bin.

[0057] The fan assembly 6 and the steam guide channel 1 are detachably installed.

[0058] By arranging the device maintenance bin and arranging the fan assembly 6 in the device maintenance bin, the maintenance convenience of the fan assembly 6 is improved. In addition, the detachable installation of the fan assembly 6 and the steam guide channel 1 further improves the maintenance convenience of the fan assembly 6.

[0059] In some embodiments, the steam guide channel 1 is provided with a heat preservation layer for reducing heat leakage in the channel.

[0060] By wrapping the steam guide channel 1 with a heat preservation layer, the temperature drop of the high-temperature steam during the floating process is reduced, and then more heat of the underground heat source is carried to the ground heat exchange assembly 4 by the high-temperature steam, that is, the efficiency of geothermal energy exploitation is improved.

[0061] In actual implementation, the heat preservation layer is preferably a heat preservation cement material, that is, the pipeline of the steam guide channel 1 is wrapped with a heat preservation cement material, which can not only reduce heat leakage in the pipeline, but also reduce the corrosion of the pipeline by external soil moisture.

[0062] In some embodiments, the liquid injection channel 3 is vertically arranged and is connected in series with a one-way valve assembly 8 that guides downward.

[0063] The upper end inlet of the liquid injection channel 3 is in communication with the lowest point of the ground heat exchange assembly 4.

[0064] As Figure 1 andFigure 2 As shown, a downward-directing one-way valve assembly 8 is installed in the liquid injection channel 3 to effectively prevent high-temperature steam from floating upward through the liquid injection channel 3, avoid obstruction of the reflux of the condensed heat exchange medium caused by air flotation, and avoid the decrease in steam temperature caused by the convergence of high-temperature steam and low-temperature liquid heat exchange medium.

[0065] At the same time, the upper inlet of the liquid injection channel 3 is connected to the lowest point of the ground heat exchange component 4, so that the condensed liquid heat exchange medium in the ground heat exchange component 4 can flow back quickly, avoiding the accumulation of liquid heat exchange medium in the ground heat exchange component 4.

[0066] In some embodiments, the geothermal vertical heat conduction system further includes a heating component 5 for direct heating of the heat transfer medium within the above-ground load module.

[0067] By setting up heating component 5, the heat transfer medium in the ground load device is directly heated, thereby increasing the temperature of the heat transfer medium in the ground load device during the system startup phase, enabling the ground load device to quickly output heat.

[0068] like Figure 1 As shown, the ground load device is a heat exchange boiler, the ground heat exchange component 4 is the coil inside the heat exchange boiler, and the heating component 5 is the auxiliary heating device inside the heat exchange boiler. By heating simultaneously through the coil and the auxiliary heating device, the heat exchange boiler can quickly output heat during the start-up phase.

[0069] In some embodiments, such as Figure 2 As shown, the ground load device is a water tank with water as the internal heat transfer medium. The ground heat exchange component 4 is a coil immersed in water, and the heating component 5 is an auxiliary heating device set at the bottom of the water tank. The water in the water tank is heated rapidly by the simultaneous heating of the coil and the auxiliary heating device.

[0070] In some embodiments, the underground heat exchange assembly 2 includes a heat exchange tube made of a material with high thermal conductivity.

[0071] And / or, the underground heat exchange assembly 2 and / or the above-ground heat exchange assembly 4 include several sets of heat-conducting fins for improving heat exchange efficiency.

[0072] The underground heat exchange component 2 and / or the above-ground heat exchange component 4 are made of metal materials with high thermal conductivity, preferably copper, aluminum, etc., which can effectively improve the heat transfer efficiency.

[0073] Meanwhile, by setting heat-conducting fins in the underground heat exchange component 2 and / or the above-ground heat exchange component 4, the heat exchange area is increased, and the heat exchange efficiency is further improved.

[0074] In some embodiments, the geothermal vertical heat conduction system further includes a pressure transmitter 9 and / or a temperature transmitter 10;

[0075] The pressure transmitting assembly 9 is used to acquire pressure data in the medium circulation loop and / or the underground heat exchange assembly 2.

[0076] The temperature transmitting assembly 10 is used to acquire temperature data of the heat transfer medium in the above-ground load module.

[0077] By arranging the pressure transmitting assembly 9 in the medium circulation loop, the pressure of the medium circulation loop is monitored to control the operation of the vacuum pump assembly 7.

[0078] By arranging the temperature transmitting assembly 10 in the above-ground load module, the temperature of the heat transfer medium is monitored to control the operation of the heating assembly 5.

[0079] In some embodiments, the inner wall of the channel of the medium circulation loop is provided with a corrosion-resistant layer.

[0080] The inner wall of the pipeline of the steam guide channel 1, the underground heat exchange assembly 2, the liquid injection channel 3 and the above-ground heat exchange assembly 4 is made of corrosion-resistant material or coated with corrosion-resistant coating to reduce the corrosion of the heat transfer medium to the inner wall of the pipeline and increase the service life of the system.

[0081] In addition to the geothermal energy vertical heat conduction systems disclosed in the above embodiments, the present application also provides a control method for controlling any one of the above geothermal energy vertical heat conduction systems, which comprises:

[0082] Acquiring pressure data P in the medium circulation loop and / or the underground heat exchange assembly 2, and determining whether P is less than a preset pressure P0;

[0083] If not, the vacuum pump assembly 7 is controlled to start until P < P0;

[0084] If not, the step of acquiring the pressure P is returned.

[0085] The gas pressure in the medium circulation loop and / or the underground heat exchange assembly 2 is acquired in real time, and when the pressure exceeds a preset value, the vacuum pump assembly 7 is started to perform negative pressure pumping on the medium circulation loop and / or the underground heat exchange assembly 2, so that the heat transfer medium in the underground heat exchange assembly 2 is always in a low-pressure state, the boiling point of the heat transfer medium in the underground heat exchange assembly 2 is reduced, and the heat transfer medium is rapidly vaporized.

[0086] In addition to the geothermal energy vertical heat conduction systems disclosed in the above embodiments, the present application also provides a control method for controlling any one of the above geothermal energy vertical heat conduction systems, which comprises:

[0087] Acquiring temperature T of the heat transfer medium in the above-ground load device, and determining whether T is less than a preset temperature T0;

[0088] If yes, the heating assembly 5 is controlled to work until T > T0,

[0089] If no, judge whether T is greater than second preset temperature T1;

[0090] If yes, control vacuum pump assembly 7 to stop working, and / or control fan assembly 6 to reduce power, until T < T1;

[0091] If no, return to the step of acquiring temperature T.

[0092] Wherein T1 is greater than T, that is, when the temperature of heat transfer medium exceeds the upper limit of output temperature, by stopping the vacuum pump assembly 7 to work, stopping the medium circulation loop and / or the air pressure drop in the underground heat exchange assembly 2, and then making the boiling point of the heat transfer medium in the underground heat exchange assembly 2 rise properly, slowing down the efficiency of the heat transfer medium vaporization, at the same time, reducing the power of the fan assembly 6, that is, slowing down the floating rate of high-temperature steam, and then reducing the heat transfer of the underground heat source upward, and then making the temperature of the heat transfer medium return to the normal output temperature range.

[0093] Moreover, by monitoring the temperature of the heat transfer medium in the above-ground load device in real time, when the temperature is lower than the preset value, the heating assembly 5 is controlled to heat the heat transfer medium, ensuring the stability of the output temperature of the above-ground load device.

[0094] In some embodiments, water is used as the heat transfer medium, preferably pure water, reducing the attachment of scale on the inner wall of the pipeline. In use, the water enters the underground heat exchange assembly 2 through the liquid injection channel 3, absorbs underground heat energy, vaporizes into water vapor, the water vapor floats up through the steam guide channel 1, enters the above-ground heat exchange assembly 4, and releases heat, liquefies after heat release, and is injected back into the underground heat exchange assembly 2 through the liquid injection channel 3, realizing the circulation of water.

[0095] In some embodiments, other phase change materials are used as the heat transfer medium, which also vaporizes in the underground heat exchange assembly 2, releases heat in the above-ground heat exchange assembly 4, and realizes circulation, which can achieve the same function.

[0096] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between each embodiment can be referred to each other.

[0097] The geothermal energy vertical heat conduction system and the control method provided by the present application are described in detail above. The principles and implementation modes of the present application are described by applying specific examples in this paper. The above embodiment is only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A geothermal vertical heat conduction system, characterized in that, include: The medium circulation loop includes a steam conduction channel (1), an underground heat exchange component (2), a liquid injection channel (3), and an above-ground heat exchange component (4) connected in series and in a closed loop. The medium circulation loop is filled with a heat exchange medium. The underground heat exchange component (2) is used to exchange heat with underground thermal energy, and the above-ground heat exchange component (4) is used to exchange heat with the above-ground load module. A vacuum pump assembly (7) is connected to the medium circulation loop and is used to create a negative pressure within the underground heat exchange assembly (2).

2. The geothermal vertical heat conduction system according to claim 1, characterized in that, The steam guide channel (1) is arranged vertically and connected in series with several fan assemblies (6) to drive the steam in the steam guide channel (1) to float upward.

3. The geothermal vertical heat conduction system according to claim 2, characterized in that, It also includes an equipment maintenance compartment, in which the fan assembly (6) is located; The fan assembly (6) and the steam guide channel (1) are detachable and installable.

4. The geothermal vertical heat conduction system according to claim 1, characterized in that, The steam guide channel (1) is equipped with an insulation layer to reduce heat loss from the channel.

5. The geothermal vertical heat conduction system according to claim 1, characterized in that, The injection channel (3) is arranged vertically and connected in series with a downward-conducting one-way valve assembly (8). The upper inlet of the injection channel (3) is connected to the lowest point of the ground heat exchange component (4).

6. The geothermal vertical heat conduction system according to claim 1, characterized in that, It also includes a heating component (5) for direct heating of the heat transfer medium within the ground load module.

7. The geothermal vertical heat conduction system according to claim 1, characterized in that, The underground heat exchange assembly (2) includes heat exchange tubes made of a material with high thermal conductivity; And / or, the underground heat exchange assembly (2) and / or the above-ground heat exchange assembly (4) include several sets of heat-conducting fins for improving heat exchange efficiency.

8. The geothermal vertical heat conduction system according to claim 1, characterized in that, It also includes a pressure transmitter assembly (9) and / or a temperature transmitter assembly (10); The pressure transmitter (9) is used to acquire pressure data in the medium circulation loop and / or the underground heat exchange assembly (2); The temperature transmitter component (10) is used to acquire the temperature data of the heat transfer medium in the ground load module.

9. A control method, characterized in that, For controlling the geothermal vertical heat conduction system according to any one of claims 1-8, comprising: Obtain the pressure data P in the medium circulation loop and / or underground heat exchange components (2), and determine whether P is less than the preset pressure P0; If not, start the vacuum pump assembly (7) until P < P0; If not, return to the step of obtaining pressure P.

10. A control method, characterized in that, For controlling the geothermal vertical heat conduction system according to any one of claims 1-8, the steam conduction channel (1) is connected in series with a plurality of fan assemblies (6), including: Obtain the temperature T of the heat transfer medium inside the ground load device and determine whether T is less than the preset temperature T0; If so, control the heating component (5) to work until T > T0. If not, determine whether T is greater than the second preset temperature T1; If so, control the vacuum pump assembly (7) to stop working, and / or control the fan assembly (6) to reduce power until T < T1; If not, return to the step of obtaining temperature T.

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