Phase change material energy collection underground diaphragm wall and construction mode thereof
By configuring phase change materials and thermal insulation layers in underground continuous walls, the problems of low energy exchange efficiency and heat island effect are solved, and efficient energy utilization and reduced energy loss are achieved.
Patent Information
- Application Number
- CN202511033594.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-25
- Publication Date
- 2025-09-05
AI Technical Summary
The existing energy collection underground continuous wall causes the urban heat island effect to be aggravated during the heat exchange between buildings and underground rock formations, and the energy exchange efficiency is low, resulting in energy loss problems.
Phase change materials are used to configure heat exchange layers at different depths, combined with insulation layers for separation, and the pouring process is controlled by an opening and closing folding device to form an underground continuous wall structure with both insulation and heat storage properties.
It improves the heat exchange efficiency between the underground continuous collection wall and the deep soil layer, reduces energy loss, and improves energy utilization and use value.
Smart Images
Figure CN120592201A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of ground source heat pumps, and in particular to an underground continuous wall for energy collection using a phase change material and a construction method thereof. Background Art
[0002] my country's current development direction is to achieve sustainable energy utilization and develop and utilize clean energy. Shallow geothermal energy has the characteristics of large reserves, wide distribution, clean and renewable.
[0003] By combining the composite energy underground continuous wall with the ground source heat pump buried pipe to form an energy composite energy underground continuous wall, it can play the dual role of underground shallow geothermal extraction and anti-seepage retaining soil. At the same time, it can avoid the high drilling cost and large space occupation of the buried pipe heat exchanger, and has good economic benefits.
[0004] According to the current application of energy-harvesting underground continuous walls, the heat exchange between buildings and underground rock formations changes the local surface temperature near the buildings, which exacerbates the urban heat island effect. Summary of the Invention
[0005] The purpose of the present invention is to provide a phase change material energy collection underground continuous wall and its construction method. By configuring phase change materials in different proportions in heat exchange layers at different depths, the heat exchange efficiency between the underground collection continuous wall and the deep soil layer is improved. The fourth heat exchange layer is separated from the underground space by an insulation layer, and the energy exchange between the underground space and the heat exchange layer is reduced, thereby reducing energy loss. In this way, the continuous wall has the properties of heat insulation and heat storage, improves energy utilization, and enhances the use value of the continuous wall.
[0006] To achieve the above-mentioned objectives, the present invention provides an underground continuous wall for energy collection using phase change materials, comprising a heat exchange tube, a steel cage, a heat exchange layer and a heat insulation layer inside the continuous wall. The heat exchange tube and the steel cage are fixed by binding. The heat exchange layer is provided with phase change materials in different proportions at different depths. A separation layer is provided between the heat exchange layer and the heat insulation layer and between heat exchange layers at different depths. The separation layer comprises a first separation layer and a second separation layer. An opening and closing folding device is provided on the first separation layer. The first separation layer is connected to the steel cage by binding with wire.
[0007] Preferably, the heat exchange layer includes a first heat exchange layer, a second heat exchange layer is provided above the first heat exchange layer, a third heat exchange layer is provided above the second heat exchange layer, an insulation layer and a fourth heat exchange layer are provided above the third heat exchange layer, a first separation layer is provided between the first heat exchange layer and the second heat exchange layer, between the second heat exchange layer and the third heat exchange layer, between the third heat exchange layer and the fourth heat exchange layer and between the insulation layers, and a second separation layer is provided between the insulation layer and the fourth heat exchange layer.
[0008] Preferably, the first separation layer is placed horizontally, and the second separation layer is placed vertically, and both the first separation layer and the second separation layer are steel meshes.
[0009] Preferably, the heat exchange tubes are arranged in series alternately in a positive U shape and an inverted U shape, the heat exchange tubes are high-density polyethylene tubes, the heat exchange tubes are tied inside the steel cage by wire, and the water inlet and outlet of the heat exchange tubes extend 200-300mm out of the steel cage, the outer diameter of the heat exchange tubes is 25-30mm, the wall thickness is 1-2.5mm, the spacing between the heat exchange tubes is 0.5-1m, and the heat exchange tubes are 50mm away from the edge of the wall.
[0010] Preferably, the heat exchange layer is phase change heat storage concrete mixed with concrete and phase change material, and the heat insulation layer is heat insulation concrete using expanded perlite as concrete mud mortar.
[0011] Preferably, each first partition layer is provided with a set of opening and closing folding devices, which include a track welded to the steel cage, the track being slidably connected to the slider, the slider being hinged to the connecting rod, the other end of the connecting rod being hinged to the first partition layer, and the lowest end of the track being placed above the connection between the first partition layer and the steel cage.
[0012] Preferably, a chamber is fixedly mounted on the back of the track, a radio motor is mounted in the chamber, an output shaft of the radio motor is connected to a push rod, and the push rod passes through the track and is placed below the slider.
[0013] Preferably, a pressure sensor is provided at the connection between the first separation layer and the steel cage, and the pressure sensor and the radio motor are both electrically connected to the controller.
[0014] Preferably, the energy wall in the underground soil layer is divided into three sections, each of which is 1 / 3l0. Each section is the first heat exchange layer, the second heat exchange layer, and the third heat exchange layer. An underground space is provided above the underground soil layer, and the underground space is in contact with the insulation layer. The fourth heat exchange layer and the insulation layer are symmetrically arranged on both sides of the second separation layer.
[0015] The present invention provides a construction method for a phase change material energy collection underground continuous wall, comprising the following steps:
[0016] Step 1: Lay out infrastructure, construct guide walls and excavate trench sections. The top surface of the guide walls should be higher than the construction ground and 0.5-1m higher than the groundwater level.
[0017] Step 2: According to the size of the trough section, a steel cage is made, and an opening and closing folding device and a first separation layer are set on the steel cage. The heat exchange tubes are arranged in a straight line on the side facing the underground soil layer, and the heat exchange tubes are fixed to the inner side of the steel cage with wire ties;
[0018] Step 3: Hoist the steel cage into the trough section;
[0019] Step 4: Lower the concrete pouring pipe to a position 0.3-0.5m away from the bottom of the trough section and pour concrete. Pour and vibrate the concrete in layers according to the different phase change material configurations in the underground soil layer. After the vibration is completed, start the opening and closing folding device to close the first separation layer. After completing the pouring layer by layer, pour concrete on both sides of the second separation layer above the third heat exchange layer at the same time. Pour phase change heat storage concrete on the side in contact with the underground soil layer to form the fourth heat exchange layer, and pour insulation concrete on the other side to form an insulation layer. Finally, the construction of the underground continuous wall trough section for energy collection is completed.
[0020] Therefore, the present invention adopts the above-mentioned phase change material energy collection underground continuous wall and its construction method, which has the following beneficial effects:
[0021] (1) By configuring different proportions of phase change materials in heat exchange layers at different depths, the heat exchange efficiency between the underground continuous wall and the deep soil layer is improved. The fourth heat exchange layer is separated from the underground space by an insulation layer, which reduces the energy exchange between the underground space and the heat exchange layer, thereby reducing energy loss. This makes the continuous wall have the properties of heat insulation and heat storage, improves energy utilization, and enhances the use value of the continuous wall.
[0022] (2) By setting up an opening and closing folding device, the phase change material can be replaced in time during pouring to pour the next layer.
[0023] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a front view of an embodiment of a phase change material energy collection underground continuous wall and its construction method according to the present invention;
[0025] Figure 2 This is a schematic structural diagram of a phase change material energy harvesting underground continuous wall and its construction method embodiment of the present invention, including a steel cage and a separation layer (tracks not shown);
[0026] Figure 3 This is a schematic diagram of a half-section structure of a phase change material energy collection underground continuous wall and its construction method embodiment of the present invention;
[0027] Figure 4 This is a heat exchange tube arrangement diagram of an embodiment of a phase change material energy collection underground continuous wall and its construction method of the present invention;
[0028] Figure 5 It is a structural schematic diagram of an opening and closing folding device of an underground continuous wall for energy collection using a phase change material and an embodiment of its construction method according to the present invention.
[0029] Reference numerals
[0030] 1. Underground soil layer; 2. Energy wall; 3. Heat exchange tube; 4. Underground space; 5. Steel cage; 6. Tie wire; 7. First heat exchange layer; 8. Second heat exchange layer; 9. Third heat exchange layer; 10. Fourth heat exchange layer; 11. Insulation layer; 12. First separation layer; 13. Second separation layer; 14. Water inlet; 15. Water outlet; 16. Opening and closing folding device; 17. Track; 18. Slider; 19. Chamber; 20. Radio motor; 21. Push rod; 22. Connecting rod. DETAILED DESCRIPTION
[0031] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.
[0032] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
[0033] Example 1
[0034] like Figure 1 、 Figure 3 As shown, the present invention provides a phase change material energy collection underground continuous wall, including a heat exchange tube 3, a steel cage 5, a heat exchange layer and a heat insulation layer 11 inside the continuous wall. The heat exchange tube 3 and the steel cage 5 are fixed by binding. A separation layer is provided between the heat exchange layer and the heat insulation layer 11 and between heat exchange layers of different depths. The separation layer includes a first separation layer 12 and a second separation layer 13. The first separation layer 12 is placed horizontally and the second separation layer 13 is placed vertically. The first separation layer 12 and the second separation layer 13 are both steel wire mesh. Figure 2 As shown, the first separation layer 12 is provided with an opening and closing folding device 16, and the first separation layer 12 is connected to the steel cage 5 by tying wires 6. The heat exchange tubes 3 are used to achieve heat exchange between the surface and the underground, the steel cage 5 provides support, the thermal insulation layer 11 is used to prevent heat loss and improve heat exchange efficiency, the separation layer is used to control heat conduction and the height of the heat exchange layer during casting, and the opening and closing folding device 16 is used to control the opening and closing of the first separation layer 12.
[0035] The heat exchange layer is configured with phase change materials (PCMs) in varying proportions at different depths. The heat exchange layer is a heat-storage concrete mixture of concrete and PCMs in varying proportions. The PCMs are a 20mm particle size CA-MA-HSB composite PCM and graphite powder (GP). The CA-MA-HSB composite replaces a certain proportion of the coarse aggregate in the concrete, while the GP replaces a certain proportion of the cement. The insulation layer 11 is an insulating concrete mortar with expanded perlite, offering excellent thermal insulation, environmental friendliness, and corrosion resistance.
[0036] The heat exchange layer includes a first heat exchange layer 7, a second heat exchange layer 8 is provided above the first heat exchange layer 7, a third heat exchange layer 9 is provided above the second heat exchange layer 8, a heat insulation layer 11 and a fourth heat exchange layer 10 are provided above the third heat exchange layer 9, a first separation layer 12 is provided between the first heat exchange layer 7 and the second heat exchange layer 8, between the second heat exchange layer 8 and the third heat exchange layer 9, between the third heat exchange layer 9 and the fourth heat exchange layer 10 and between the heat insulation layer 11, and a second separation layer 13 is provided between the heat insulation layer 11 and the fourth heat exchange layer 10. By arranging the first heat exchange layer 7, the second heat exchange layer 8 and the third heat exchange layer 9 in layers, energy loss can be reduced.
[0037] like Figure 4 As shown, the heat exchange tube 3 is arranged in series alternately with a positive U shape and an inverted U shape. The heat exchange tube 3 is a high-density polyethylene tube. The heat exchange tube 3 is tied inside the steel cage 5 by a wire tie 6, and the water inlet 14 and the water outlet 15 of the heat exchange tube 3 both extend out of the steel cage 5200-300mm. The outer diameter of the heat exchange tube 3 is 25-30mm, the wall thickness is 1-2.5mm, the spacing between the heat exchange tubes 3 is 0.5-1m, and the heat exchange tube 3 is 50mm away from the edge of the wall.
[0038] like Figure 5 As shown, each first partition layer 12 is equipped with an opening, closing, and folding device 16. The opening, closing, and folding device 16 includes a track 17 welded to the steel cage 5. The track 17 is slidably connected to a slider 18, which slides within the track 17. The slider 18 is hinged to a connecting rod 22, the other end of which is hinged to the first partition layer 12. When the slider 18 slides downward, it drives the connecting rod 22 to move, thereby controlling the downward movement of the first partition layer 12. The lowest end of the track 17 is placed above the connection between the first partition layer 12 and the steel cage 5, ensuring that the first partition layer 12 is in a horizontal position when the slider 18 slides to the lowest end of the slide rail.
[0039] A chamber 19 is fixedly mounted on the back of the track 17, and a radio 20 is mounted in the chamber 19. The chamber 19 is used to protect the radio 20. The output shaft of the radio 20 is connected to a push rod 21, which passes through the track 17 and is placed under the slider 18. The radio 20 is used to provide power to the push rod 21, which can control whether the slider 18 slides down and acts as a limiter for the slider 18.
[0040] Pressure sensors are installed at the junction of the first separation layer 12 and the steel cage 5. These sensors monitor whether the poured cement has reached the junction between the first separation layer 12 and the steel cage 5. The pressure sensors and the radio 20 are both electrically connected to a controller, which receives electrical signals from the pressure sensors and controls the operation of the radio 20.
[0041] When the pressure sensor detects that the pouring of the first heat exchange layer 7 is completed, the electrical signal is transmitted to the controller. After receiving the signal, the controller turns off the pouring device, and the controller controls the radio motor 20 to start. The radio motor 20 drives the push rod 21 to retract, thereby canceling the control of the slider 18. The slider 18 slides downward under the action of gravity until it slides to the bottom of the track 17. At this time, the first separation layer 12 is in a horizontal position. After the solidification is completed, the second heat exchange layer 8 is poured, and so on until the third heat exchange layer 9 is poured. Then, the fourth heat exchange layer 10 and the heat insulation layer 11 are poured on both sides of the second separation layer 13 above the third heat exchange layer 9.
[0042] The energy wall 2 in the underground soil layer 1 is divided into three sections, each of which is 1 / 3l0. Each section is the first heat exchange layer 7, the second heat exchange layer 8, and the third heat exchange layer 9. An underground space 4 is provided above the underground soil layer 1. The underground space 4 is in contact with the insulation layer 11. The fourth heat exchange layer 10 and the insulation layer 11 are symmetrically arranged on both sides of the second separation layer 13.
[0043] The present invention provides a construction method for a phase change material energy collection underground continuous wall, comprising the following steps:
[0044] Step 1: Lay out infrastructure, construct guide walls and excavate trench sections. The top surface of the guide walls should be higher than the construction ground and 0.5-1m higher than the groundwater level.
[0045] Step 2: According to the size of the trough section, a steel cage 5 is made, and an opening and closing folding device 16 and a first separation layer 12 are set on the steel cage 5. The heat exchange tubes 3 are arranged in a straight line on the side facing the underground soil layer 1. The heat exchange tubes 3 are fixed to the inner side of the steel cage 5 by tying wires 6;
[0046] Step 3: Hoist the steel cage 5 into the trough section;
[0047] Step 4: Lower the concrete pouring pipe to a position 0.3-0.5m away from the bottom of the trench section to pour concrete. Pour and vibrate the concrete in layers according to the different phase change material configurations in the underground soil layer 1. After the vibration is completed, start the opening and closing folding device 16 to close the first separation layer 12. After completing the pouring layer by layer, pour concrete on both sides of the second separation layer 13 above the third heat exchange layer 9 at the same time. Pour phase change heat storage concrete on the side in contact with the underground soil layer 1 to form the fourth heat exchange layer 10, and pour insulation concrete on the other side to form the insulation layer 11, and finally complete the construction of the underground continuous wall trench section for energy collection.
[0048] Therefore, the present invention adopts the above-mentioned phase change material energy collection underground continuous wall and its construction method, and improves the heat exchange efficiency between the underground collection continuous wall and the deep soil layer by configuring phase change materials in different proportions in the heat exchange layers at different depths. The fourth heat exchange layer is separated from the underground space by the insulation layer, reducing the energy exchange between the underground space and the heat exchange layer, thereby reducing energy loss, so that the continuous wall has the properties of heat insulation and heat storage, improving energy utilization and enhancing the use value of the continuous wall.
[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.
Claims
1. A phase change material energy collection underground continuous wall, characterized by: It includes heat exchange pipes, steel cages, heat exchange layers and insulation layers inside the continuous wall. The heat exchange pipes and the steel cages are fixed by binding. The heat exchange layers are configured with phase change materials in different proportions at different depths. There are separation layers between the heat exchange layer and the insulation layer and between heat exchange layers of different depths. The separation layers include a first separation layer and a second separation layer. The first separation layer is provided with an opening and closing folding device. The first separation layer and the steel cage are connected by binding with wire.
2. The phase change material energy collection underground continuous wall according to claim 1, characterized in that: The heat exchange layer includes a first heat exchange layer, a second heat exchange layer is provided above the first heat exchange layer, a third heat exchange layer is provided above the second heat exchange layer, a heat insulation layer and a fourth heat exchange layer are provided above the third heat exchange layer, a first separation layer is provided between the first heat exchange layer and the second heat exchange layer, between the second heat exchange layer and the third heat exchange layer, between the third heat exchange layer and the fourth heat exchange layer and between the heat insulation layers, and a second separation layer is provided between the heat insulation layer and the fourth heat exchange layer.
3. The phase change material energy collection underground continuous wall according to claim 1, characterized in that: The first separation layer is placed horizontally, and the second separation layer is placed vertically. Both the first separation layer and the second separation layer are steel wire meshes.
4. The phase change material energy collection underground continuous wall according to claim 1, characterized in that: The heat exchange tubes are arranged in series alternately in a positive U shape and an inverted U shape. The heat exchange tubes are high-density polyethylene tubes. The heat exchange tubes are tied inside the steel cage by wire, and the water inlet and outlet of the heat exchange tubes extend 200-300mm out of the steel cage. The outer diameter of the heat exchange tubes is 25-30mm, the wall thickness is 1-2.5mm, the spacing between the heat exchange tubes is 0.5-1m, and the heat exchange tubes are 50mm away from the wall edge.
5. The phase change material energy collection underground continuous wall according to claim 1, characterized in that: The heat exchange layer is phase change heat storage concrete mixed with concrete and phase change material, and the heat insulation layer is heat insulation concrete with expanded perlite as concrete mud mortar.
6. The phase change material energy collection underground continuous wall according to claim 1, characterized in that: Each first partition layer is provided with a set of opening and closing folding devices, which include tracks welded to the steel cage. The tracks are slidably connected to the slider, the slider is hinged to the connecting rod, and the other end of the connecting rod is hinged to the first partition layer. The lowest end of the track is placed above the connection between the first partition layer and the steel cage.
7. The phase change material energy collection underground continuous wall according to claim 6, characterized in that: A chamber is fixedly installed on the back of the track, and a radio motor is installed in the chamber. The output shaft of the radio motor is connected to a push rod, and the push rod passes through the track and is placed under the slider.
8. The phase change material energy collection underground continuous wall according to claim 7, characterized in that: A pressure sensor is provided at the connection between the first separation layer and the steel cage, and the pressure sensor and the radio motor are both electrically connected to the controller.
9. The phase change material energy collection underground continuous wall according to claim 1, characterized in that: The energy wall in the underground soil layer is divided into three sections, each of which is 1 / 3l0. Each section is the first heat exchange layer, the second heat exchange layer, and the third heat exchange layer. There is an underground space above the underground soil layer, which is in contact with the insulation layer. The fourth heat exchange layer and the insulation layer are symmetrically arranged on both sides of the second separation layer.
10. The construction method of the phase change material energy collection underground continuous wall according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Lay out infrastructure, construct guide walls and excavate trench sections. The top surface of the guide walls should be higher than the construction ground and 0.5-1m higher than the groundwater level. Step 2: According to the size of the trough section, a steel cage is made, and an opening and closing folding device and a first separation layer are set on the steel cage. The heat exchange tubes are arranged in a straight line on the side facing the underground soil layer, and the heat exchange tubes are fixed to the inner side of the steel cage with wire ties; Step 3: Hoist the steel cage into the trough section; Step 4: Lower the concrete pouring pipe to a position 0.3-0.5m away from the bottom of the trough section and pour concrete. Pour and vibrate the concrete in layers according to the different phase change material configurations in the underground soil layer. After the vibration is completed, start the opening and closing folding device to close the first separation layer. After completing the pouring layer by layer, pour concrete on both sides of the second separation layer above the third heat exchange layer at the same time. Pour phase change heat storage concrete on the side in contact with the underground soil layer to form the fourth heat exchange layer, and pour insulation concrete on the other side to form an insulation layer. Finally, the construction of the underground continuous wall trough section for energy collection is completed.