A heat exchange method for artificial underground circulation ditch heat energy

Abstract

The present invention discloses a heat exchange method for artificial underground circulating ditch heat energy. The first step is to establish an artificial underground circulating ditch heat energy exchange system, the system includes a recharge pool, a filter layer, a permeable heat exchange filling layer, a conductive and anti-seepage layer, a water outlet, a circulation pump and a circulation pool; the system establishment method is: dig a ditch underground, lay a conductive and anti-seepage layer on the bottom and both sides of the ditch, lay a permeable heat exchange filling layer and a filter layer on the conductive and anti-seepage layer, the two ends of the permeable heat exchange filling layer are connected to the filter layer, the two ends of the filter layer are respectively connected to one end of the outlet pipe and the lower end of the inlet pipe, the other end of the outlet pipe is at the upper part of the circulation pool, and there is a circulation pump at the bottom of the circulation pool.

Description

Technical Field

[0001] The invention relates to the technical field of shallow geothermal energy equipment, in particular to an artificial underground circulating ditch heat energy heat exchange method. Background Art

[0002] Ground source heat pump is a heating, cooling and air conditioning system that uses the solar energy stored in the soil as a heat source to convert energy. Ground source heat pump is a technology that uses clean renewable energy. The surface soil and water are a huge solar collector, collecting 47% of the solar radiation energy, which is 500 times more than what humans use each year; it is also a huge dynamic energy balance system. The surface soil and water naturally maintain a relative balance between energy reception and dissipation. The success of ground source heat pump technology makes it possible to use the nearly unlimited solar energy or ground energy stored in it. The core of ground source heat pump technology is the underground heat energy exchange system.

[0003] In addition to digging wells to extract water and recharging to extract energy, the existing ground source heat pump technology underground heat energy exchange method basically adopts vertical or horizontal direct burial of various pipes, and the medium circulates in the direct buried pipes to exchange heat energy with the underground soil through the pipe wall. If more heat is needed, more wells need to be dug. However, due to its high technical requirements, high cost and high construction difficulty. In addition, due to the small heat exchange area between the pipe wall and the soil and the low energy exchange efficiency, the initial investment cost of the ground source heat pump technology is too high, and the effective well area limit cannot dig more wells. This limits the promotion and use of ground source heat pumps. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies, the present invention provides an artificial underground circulation ditch heat energy exchange system.

[0005] The technical solution adopted in the present invention is as follows:

[0006] A heat exchange method for artificial underground circulating ditch heat energy, comprising the following steps:

[0007] The first step is to establish an artificial underground circulating ditch heat energy exchange system, which includes a recharge pool, a filter layer, a permeable heat exchange filling layer, a conduction and anti-seepage layer, a water outlet, a circulation pump and a circulation pool; the method for establishing the system is: dig a ditch underground, lay a conduction and anti-seepage layer on the bottom and both sides of the ditch, lay a permeable heat exchange filling layer and a filter layer on the conduction and anti-seepage layer, the two ends of the permeable heat exchange filling layer are connected to the filter layer, the two ends of the filter layer are respectively connected to one end of the outlet pipe and the lower end of the inlet pipe, the other end of the outlet pipe is at the upper part of the circulation pool, and there is a circulation pump at the bottom of the circulation pool, the circulation pump is connected to the heat pump through a pipeline, the heat pump is connected to the heat use device through a pipeline, the energy use device is connected to the upper part of the recharge pool through a pipeline, and the lower part of the recharge pool is connected to the upper end of the inlet pipe; the heat pump and the energy use device are both on the ground, and the recharge pool is in the surface frozen soil layer. The filter layer and the permeable filling layer are in the underground transducer layer, the water outlet pipe and the water inlet pipe are in the underground transducer layer, and the conduction and anti-permeability layer are in the underground transducer layer;

[0008] Step 2: Circulating water is injected into the circulating pool. The circulating pump in the circulating pool inputs the water in the circulating pool into the heat pump and the heat using device for heat exchange to form low-temperature water which enters the reinjection pool. The low-temperature water in the reinjection pool passes through the filter layer, the permeable heat exchange filling layer and the filter layer for heat exchange to form medium-high temperature water which enters the circulating water pool. The circulating pump is then used to transport the medium-high temperature circulating water in the circulating water pool to the heat pump inlet. The heat pump uses external power to extract heat from the medium-high temperature circulating water. The heat using device releases the heat extracted by the heat pump to the use end for heat release, and transports the low-temperature circulating water after heat extraction to the reinjection pool. The above process is circulated in this way.

[0009] The filter layer is composed of fiber filter material, and its structure is consistent with the fiber structure.

[0010] The conductive and anti-permeation layer is a plastic film or an anti-permeation material with conductive properties.

[0011] The permeable heat exchange filling layer is gravel or a permeable filling material having the ability to exchange heat.

[0012] Compared with the existing underground heat exchange technology of ground source heat pump technology, the effect of the present invention is: the present invention solves the problems of large footprint, low energy exchange efficiency, high technical requirements, high cost and great construction difficulty of the underground energy exchange system of ground source heat pump technology. The present invention improves the underground energy exchange efficiency of ground source heat pump technology, the materials are easy to obtain, the construction is simple, the cost is low, it is only 1 / 10 of the investment in buried pipes, and there are no technical barriers. Therefore, there is no situation where the changes in the underground stress field cause the heat exchange tubes buried in the soil to be stretched and broken, and squeezed and deformed, so the heat exchange tubes are buried deep underground and cannot be maintained. If the present invention can be promoted, it will more effectively promote the development of ground source heat pump technology. Make a huge contribution to energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1It is a schematic diagram of the side sectional structure of the present invention.

[0014] Figure 2 It is a front cross-sectional structural schematic diagram of the present invention.

[0015] Figure 3 is an enlarged view of point A in Figure 1.

[0016] In the figure: 1. Recharge pool, 2. Filtration layer, 3. Permeable heat exchange filling layer, 4. Conductive and anti-seepage layer, 5. Outlet pipe, 6. Circulation pump, 7. Circulation pool, 8. Heat pump, 9. Heat utilization device, 10. Above-ground part, 11. Surface frozen soil layer, 12. Underground energy conversion layer, 13. Inlet pipe. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1 -3, the land is divided into the aboveground part 10, the surface frozen soil layer 11 and the underground transducer layer 12 in order of depth. The surface frozen soil layer 11 exists in winter, and the depth of the surface frozen soil layer 11 varies according to the climate and region of the earth. As the temperature rises, the surface frozen soil layer 11 disappears. Several artificial ditches are excavated in the underground transducer layer 12, and a conductive and anti-permeable layer 4 is laid at the bottom and both sides of the ditch. The conductive and anti-permeable layer 4 can be an anti-permeable material with conductive properties, such as a plastic film; a permeable heat exchange filling layer 3 is laid on the conductive and anti-permeable layer 4, and the permeable heat exchange filling layer 3 can be gravel or a permeable filler with exchange energy. A filter material filter layer 2 is added at both ends of the ditch. The filter material filter layer 2 can be a material with permeable filtration. The filter material filter layer 2 can be composed of fiber filter material, and the structure is consistent with the fiber structure, such as filter cotton. The two ends of the filter layer 2 are respectively connected to one end of the outlet pipe 5 and the lower end of the inlet pipe 13. A recharging tank 1 is arranged at the upper end of the water inlet pipe 13, and the water inlet pipe 13 is connected to the recharging tank 1. A circulating pump 6 is arranged at the bottom of the circulating tank 7.

[0019] A heat exchange method for an artificial underground circulating ditch heat energy exchange system is to backfill the original soil layer and compact it to form an artificial underground circulating ditch system. After the artificial underground circulating ditch is completed, low-temperature circulating water is injected into the circulating pool 7, and the low-temperature circulating water circulating pump 6 pumps the water in the circulating pool 7 into the heat pump 8 and the heat using device 9 and then into the recharging pool 1. The water in the recharging pool 1 passes through the filter layer 2, the permeable heat exchange filling layer 3 and the filter layer 2 to form high-temperature circulating water and enter the circulating water pool 7. The circulating pump 6 then transports the high-temperature circulating water in the circulating water pool 7 to the inlet of the heat pump 8. The heat pump 8 uses external access power to extract heat from the high-temperature circulating water. The heat using device 9 releases the heat extracted by the heat pump 8 to the use end for heat release, and transports the low-temperature circulating water after heat extraction to the recharging pool 1, and the above process is circulated.

[0020] The depth of artificial underground circulation ditches, ditch width, number, area, selection of ditch filling materials, and design of recharge pools and circulation pools need to be calculated based on the actual energy exchange required by the ground source heat pump unit and the local soil thermal properties, soil heat exchange rate and soil thermal conductivity.

[0021] The invention improves the underground energy exchange efficiency of ground source heat pump technology, has easy-to-obtain materials, simple construction, low cost, only 1 / 10 of the investment in underground pipes, and no technical barriers. If the invention can be promoted, it will more effectively promote the development of ground source heat pump technology. If the invention can be widely used, it can save a lot of non-renewable energy for the country.

[0022] In the present invention, unless otherwise clearly stipulated and limited, the terms "installation", "setting", "connection", "fixation", "screw-on" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An artificial underground circulation ditch heat energy heat exchange method, characterized in that: The following steps are included: The first step is to establish an artificial underground circulating ditch heat energy exchange system, which includes a recharge pool (1), a filter layer (2), a permeable heat exchange filling layer (3), a conductive and anti-permeable layer (4), an outlet pipe (5), a circulation pump (6) and a circulation pool (7); the method for establishing the system is as follows: digging a ditch underground, laying a conductive and anti-permeable layer (4) on the bottom and both sides of the ditch, laying a permeable heat exchange filling layer (3) and a filter layer (2) on the conductive and anti-permeable layer (4), connecting the two ends of the permeable heat exchange filling layer (3) to the filter layer (2), connecting the two ends of the filter layer (2) to one end of the outlet pipe (5) and the lower end of the inlet pipe (13), and the other end of the outlet pipe (5) is connected to the circulation pool (7). ), a circulation pump (6) is provided at the bottom of the circulation pool (7), the circulation pump (6) is connected to the heat pump (8) through a pipeline, the heat pump (8) is connected to the heat using device (9) through a pipeline, the energy using device (9) is connected to the upper part of the recharging pool (1) through a pipeline, and the lower part of the recharging pool (1) is connected to the upper end of the water inlet pipe (13); the heat pump (8) and the energy using device (9) are both above ground, the recharging pool (1) is in the surface frozen soil layer (11), the filter layer (2) and the permeable filling layer (3) are in the underground energy conversion layer (12), the outlet pipe (5) and the water inlet pipe (13) are in the underground energy conversion layer (12), and the conduction and anti-permeability layer (4) is in the underground energy conversion layer (12); Step 2: The circulating pool (7) is filled with circulating water. The circulating pump (6) in the circulating pool inputs the water in the circulating pool (7) into the heat pump (8) and the heat using device (9) for heat exchange to form low-temperature water, which enters the reinjection pool (1). The low-temperature water in the reinjection pool (1) passes through the filter layer (2), the permeable heat exchange filling layer (3) and the filter layer (2) to form medium-high temperature water after heat exchange and enters the circulating pool (7). The circulating pump (6) then transports the medium-high temperature circulating water in the circulating pool (7) to the inlet of the heat pump (8). The heat pump (8) extracts heat from the medium-high temperature circulating water using external power. The heat using device (9) releases the heat extracted by the heat pump (8) to the using end for heat release, and transports the low-temperature circulating water after heat extraction to the reinjection pool (1). The above process is circulated in this way.

2. The method for heat exchange of artificial underground circulating ditch heat energy according to claim 1, characterized in that: The filter layer (2) is composed of fiber filter material.

3. The method for heat exchange of artificial underground circulating ditch heat energy according to claim 1, characterized in that: The conductive and anti-permeation layer (4) is a plastic film.

4. The method for heat exchange of artificial underground circulating ditch heat energy according to claim 1, characterized in that: The water permeable heat exchange filling layer (3) is sand and gravel.

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