Heat exchange and heat preservation integrated fabricated energy wall system for subway station

Abstract

The utility model relates to a subway station heat exchange and heat preservation integrated assembly type energy wall system which comprises an assembly type energy wall, a machine room heat pump unit, an air conditioner tail end and a transmission and distribution system. The fabricated energy wall is located between a structural wall and an off-wall wall of the subway station and is close to the soil side. An internal pipeline is arranged in the fabricated energy wall, the two ends of the internal pipeline are connected into the machine room heat pump unit through a transmission and distribution system, heat or cold is released into soil after heat exchange in the machine room heat pump unit, and a first heat exchange loop is formed. The air conditioner terminal absorbs indoor cold or heat and then enters the machine room heat pump unit through the transmission and distribution system, a second heat exchange loop is formed, and indirect heat exchange is conducted between the second heat exchange loop and the first heat exchange loop through the machine room heat pump unit. Standardized prefabrication is adopted, the influence on the mechanical property of the wall body can be reduced, the arrangement mode of the buried pipes is not limited, meanwhile, the construction period can be shortened, loss of building materials and resource waste are reduced, and installation and use are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated buildings, and in particular to an integrated heat exchange and insulation prefabricated energy wall system for a subway station. Background Art

[0002] Energy underground structures are a new type of building energy-saving technology developed based on ground-source heat pump technology. Their characteristic is that they utilize the building's or structure's own underground structural components to arrange heat exchange pipes, forming the underground heat exchange circuit of the ground-source heat pump system. Underground diaphragm walls are widely used as retaining structures in subway stations and deep foundation pits for high-rise buildings. Heat exchange pipes embedded in these diaphragm walls serve as heat exchange components, allowing heat pump technology to exploit shallow geothermal energy in the surrounding rock and soil.

[0003] Existing energy walls mainly embed heat exchange pipes into the supporting structure of underground buildings, including energy underground continuous walls and energy pile walls. The energy underground continuous wall embeds the heat exchange pipes into the underground continuous wall, ties the heat exchange pipes to the steel cage of the underground continuous wall, and then pours concrete. The energy pile wall fixes the heat exchange pipes to the steel cage of its structural piles and then pours concrete. In the above two ways of combining heat exchange pipes with underground structures, the layout of the buried pipes is restricted by the steel cage in the continuous wall. At the same time, the heat source in the underground structure will also affect the temperature stress of the underground structure. Furthermore, the above two methods use on-site cast-in-place construction, which is difficult to construct, has a long construction period, and causes a lot of construction material loss, which is not conducive to energy conservation and carbon reduction.

[0004] Therefore, it is necessary to propose new solutions to overcome the defects of underground support energy wall systems. Summary of the Invention

[0005] The purpose of the utility model is to provide a heat exchange and insulation integrated assembled energy wall system for subway stations, so as to solve the construction difficulties existing in the current on-site construction of energy walls.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present utility model is:

[0007] A heat exchange and insulation integrated assembled energy wall system for subway stations, comprising an assembled energy wall, a machine room heat pump unit, an air conditioning terminal, and a transmission and distribution system;

[0008] The assembled energy wall is located between the structural wall and the wall away from the subway station and close to the soil side;

[0009] Internal pipelines are provided in the assembled energy wall, and both ends of the internal pipelines are respectively connected to the computer room heat pump unit through the transmission and distribution system. After heat exchange in the computer room heat pump unit, the heat or cold is released into the soil, forming a first heat exchange loop; the air-conditioning terminal absorbs the cold or heat in the room and enters the computer room heat pump unit through the transmission and distribution system, forming a second heat exchange loop, and transfers energy with the first heat exchange loop through the computer room heat pump unit.

[0010] Furthermore, there is a gap between the assembled energy wall and the separated wall to form an air layer.

[0011] Furthermore, the internal pipeline is a large-diameter heat exchange tube.

[0012] Furthermore, the assembled energy wall includes a soaking plate and an insulation plate, a buried pipe layer is provided between the soaking plate and the insulation plate, and the large-diameter heat exchange pipes are arranged in the buried pipe layer.

[0013] Furthermore, a pipe groove is provided on the surface of the buried pipe layer, and the large-diameter heat exchange pipe is embedded in the pipe groove.

[0014] Furthermore, the internal pipeline is a capillary grid.

[0015] Furthermore, the assembled energy wall includes an insulation board, a buried pipe layer is provided on one side of the insulation board, and the capillary grid is arranged on the surface of the buried pipe layer.

[0016] Furthermore, the buried pipe layer is a cement fiber board.

[0017] Furthermore, aluminum foil is applied to the surface of the insulation board.

[0018] Furthermore, the assembled energy wall is a rectangular unit module, and a plurality of the unit modules are spliced in an array to form a large-area wall, and the internal pipelines of the plurality of the unit modules are connected in series with each other.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The utility model provides an integrated heat exchange and insulation assembled energy wall system for subway stations. It is prefabricated in a standardized assembled manner, which can reduce the impact on the mechanical properties of the wall. The buried pipe layout is not restricted. At the same time, it can shorten the construction period, reduce the loss of building materials and waste of resources, reduce environmental pollution, and is easy to install and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0022] Figure 1 It is a schematic diagram of the composition of the utility model system.

[0023] Figure 2 This is a schematic diagram of the installation of the prefabricated energy wall.

[0024] Figure 3 This is the structural diagram of the prefabricated energy wall.

[0025] Figure 4 This is the internal large-diameter heat exchange pipe structure diagram of the assembled energy wall.

[0026] Figure 5 This is a structural diagram of the internal large-diameter heat exchange pipes assembled in multiple prefabricated energy walls.

[0027] Figure 6 This is a diagram of the internal capillary pipeline structure of the prefabricated energy wall.

[0028] The symbols in the figure are:

[0029] 1- heat pump unit in the machine room, 2- transmission and distribution system, 3- prefabricated energy wall, 4- air conditioning terminal, 5- soil side, 6- structural wall, 7- air layer, 8- free-standing wall, 9- station side;

[0030] 31-heat sink, 32-buried pipe layer, 33-insulation board, 34-aluminum foil.

[0031] 321-water supply pipe, 322-return pipe, 323-heat exchange pipe, 324-collecting pipe, 325-buckle. DETAILED DESCRIPTION

[0032] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "disposed" should be understood in a broad sense. For example, they may refer to fixed connection or disposition, detachable connection or disposition, or integral connection or disposition. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0035] This utility model provides a prefabricated energy wall system for integrated heat exchange and insulation in subway stations. It comprises a prefabricated energy wall 3, a machine room heat pump unit 1, a distribution system 2, and air conditioning terminals 4. The prefabricated energy wall 3 is located between the subway station's structural wall 6 and the free-standing wall 8, near the soil side 5. The machine room heat pump unit 1 is located in the machine rooms on both sides of the station concourse. The distribution system 2 and air conditioning terminals 4 are located on each floor of the underground station. The air conditioning terminals can utilize fan coil units, air handling units, or radiant panels.

[0036] like Figure 1 The present invention fully utilizes the cavity between the underground station structural wall 6 and the free-standing wall 8, installing a prefabricated energy wall system within the cavity. This creates a subway station energy wall heat exchanger that serves as an underground heat exchange device for a ground-source heat pump. This system can be used for both newly constructed subway stations and to facilitate energy system renovations in existing underground stations. The system uses the soil as a cold / heat source, with the energy wall serving as the underground heat exchanger for the ground-source heat pump. In summer, the compressor within the heat pump unit works on the refrigerant, causing it to undergo a vapor-to-liquid conversion cycle. The evaporation of the refrigerant within the heat exchanger absorbs the waste heat from the indoor environment into the chilled water circulation pipeline. As the refrigerant circulates, the refrigerant condenses within the heat exchanger, absorbing the heat carried by the refrigerant through the water circulation system. This heat is then absorbed by the water circulation system and eventually enters the energy wall system. The energy wall releases the heat into the soil, achieving the purpose of providing cooling for the station. In winter, the process is exactly the opposite: the energy wall extracts heat from the soil to heat rooms within the station that require heating, such as the equipment management room. No additional drilling is required, which reduces costs. At the same time, it rationally utilizes underground space and saves resources. It can replace traditional cooling towers and solve the problems of cooling towers in ground space and aesthetic impact.

[0037] Among them, the structural wall 6 is a commonly used reinforced concrete structure, and its thickness is generally 700-1000mm. The specific method is in accordance with the relevant requirements of the building. The wall 8 is also called a moisture-proof wall, which is another wall set on the inner side of the outer wall of the structure. Its main purpose is to eliminate and reduce the impact of water leakage from the outer wall on the internal use and aesthetics of the underground space. The public areas of underground stations mostly use enameled steel plates, porcelain aluminum plates, stone and other materials to dry-hang to form wall-away walls. The equipment management area mostly uses fiber cement boards, calcium silicate boards and other cement product boards to dry-hang as wall-away walls 8. In the utility model, the wall-away wall 8 is made of cement fiber board with a thickness of 50-100mm. Cement fiber board has higher strength, low surface water absorption and good sound insulation effect. The inner surface of the cavity side of the away wall 8 is sprayed with a low-emissivity coating or covered with a low-emissivity smooth aluminum-tin film, i.e., aluminum foil 34, and the coating surface is smoothed to reduce the radiation heat exchange between the inner surface of the cavity side of the away wall 8 and other surfaces and the convection heat exchange between the inner surface and the air in the cavity, thereby reducing the heat transfer into the station through the enclosing structure.

[0038] Internal piping within the prefabricated energy wall 3 exchanges heat with the surrounding soil, providing cooling or heating for the subway station. Each end of the internal piping connects to the machine room heat pump unit 1. Heat is exchanged within the condenser / evaporator within the machine room heat pump unit 1, where it releases heat / cold energy into the soil, forming a first heat exchange loop. The air conditioning terminal 4 absorbs the indoor heat / cold energy and then enters the machine room heat pump unit 1 through the distribution system 2, forming a second heat exchange loop. This second heat exchange loop transfers energy to the first heat exchange loop through the machine room heat pump unit 1.

[0039] There is a gap between the prefabricated energy wall 3 and the separated wall 8, forming an air layer 7. The combination of the structural wall 6, the prefabricated energy wall 3, the air layer 7 and the separated wall 8 can not only play a role in insulation, but also be used for heat exchange, forming an assembled structure with integrated heat exchange and insulation in the subway station. The air layer 7 is equivalent to the waterproof layer and the second layer of insulation material of the energy wall system. Its thickness is 100-250mm. Its function is to prevent groundwater from seeping into the interior of the station and to reduce the heat in the energy wall from being transferred to the side of the station, affecting the thermal environment in the station. When the energy wall system is located in the public area of the station, the cavity thickness is 200-250mm. When the energy wall system is located in the equipment and management room of the station, the cavity thickness is 100-150mm.

[0040] In the present invention, the internal pipelines of the assembled energy wall 3 can be in the form of large-diameter heat exchange tubes or capillary tubes:

[0041] Example 1:

[0042] When the internal pipes are large-diameter heat exchange tubes, the prefabricated energy wall 3 includes a soaker plate 31 and an insulation board 33. A buried pipe layer 32 is provided between the soaker plate 31 and the insulation board 33. The large-diameter heat exchange tubes are arranged in the buried pipe layer 32. The buried pipe layer 32 is a cement fiber board with a pipe groove provided on the surface, and the large-diameter heat exchange tubes are embedded in the pipe groove.

[0043] In this embodiment, a 2mm thick vapor chamber 31 is provided to enhance heat transfer uniformity. This vapor chamber 31 provides enhanced heat dissipation, allowing the temperature to diffuse more evenly into the surrounding soil. Copper, aluminum, aluminum alloy, and stainless steel are the most common vapor chamber materials. Due to copper's excellent ductility and thermal conductivity, copper is preferred for this purpose due to its superior thermal conductivity.

[0044] Example 2:

[0045] When the internal pipeline is a capillary grid, the assembled energy wall 3 includes an insulation board 33, a buried pipe layer 32 is provided on one side of the insulation board 33, and the capillary grid is arranged on the surface of the buried pipe layer 32. The buried pipe layer 32 is a cement fiber board, and the capillary grid is bonded to the buried pipe layer 32.

[0046] In this embodiment, the capillary spacing is very small (5mm-40mm), the heat exchange area is large, and the heat exchange is uniform, so no heat spreader 31 is provided, and the buried pipe layer 32 is directly in close contact with the inner side of the structural wall 3.

[0047] In the above two embodiments, the buried pipe layer panels are made of cement fiberboard with a thickness of 50mm. When large-diameter heat exchange pipes are used, heat exchange pipe grooves are prefabricated on the panel to facilitate the arrangement of the heat exchange pipes, with the pipes facing the side of the heat spreader. The branch pipe grooves are arranged horizontally in a serpentine shape, and the main pipes are arranged vertically. Holes for connecting the branch pipes to the supply and return water mains are reserved on the panel. The heat exchange coil is made of high-temperature, pressure-resistant, and corrosion-resistant cross-linked polyethylene pipe with an outer diameter of 25mm and a wall thickness of 2.3mm. The spacing between the heat exchange pipes should be 0.3m, and a certain length should be reserved for the inlet and outlet of the heat exchange pipes, extending out of the wall to facilitate the subsequent connection with the manifold. Note that during the wall transportation process, the pipe mouth should be blocked with a rubber plug to prevent impurities and foreign objects from entering the pipe and blocking the pipe. The rubber plug should be removed after the installation is completed. When using capillary tubes as heat exchange tubes, the capillary mesh is made of tripropylene glycol. The main pipe diameter is 20*2mm, the branch pipe diameter is 3.5-4.5mm, the branch pipe wall thickness is 0.5-0.8mm, and the pipe spacing is 20mm. A horizontal pipe groove is reserved for the main pipe, and the capillary mesh is installed closely to the cement fiberboard. The plastic buckles of the capillary mesh are firmly adhered to the surface of the cement fiberboard with adhesive.

[0048] In the above two embodiments, the insulation board 33 can effectively block the heat exchange between the energy wall heat exchanger and the station side, and prevent the heat carried in the cooling water from being transferred into the station. The insulation board 33 uses extruded polystyrene foam insulation board (XPS) with a thickness of 80 mm. XPS has a low thermal conductivity, good thermal insulation performance, pressure resistance and impact resistance, and extremely low water absorption, and excellent moisture-proof, corrosion-proof and anti-penetration properties. The surface of the insulation board 33 is affixed with aluminum foil 34, and the emissivity is close to 0, which can reduce the radiation heat exchange between the assembled energy wall and other wall surfaces of the cavity. The use of a smooth aluminum-tin film can reduce the convective heat transfer coefficient on the inner side of the insulation layer to reduce the convective heat exchange.

[0049] The layers of the prefabricated energy wall are fixed with screws or round nails. When fixing, pay attention to the location of the nails and avoid the location of the pipes laid in the wall to avoid rupturing the water pipes.

[0050] The thickness of the entire prefabricated energy wall is 130-135mm, and the sizes are 2.4*1.2m and 1.2*1.2m. The installation method is to directly fix the prefabricated energy wall to the structural wall with screws, while paying attention to avoid the position of the pipes laid in the wall. The bottom is close to the inner side of the structural wall, and the aluminum foil side of the insulation layer is exposed in the cavity.

[0051] Prefabricated and assembled buildings are the future development direction of buildings. Most of the construction work of assembled buildings is carried out in factories. Therefore, the construction period of assembled buildings is shorter than that of traditional cast-in-place buildings. At the same time, assembled construction can also achieve low environmental pollution and low carbon emissions, meeting the needs of green building development. The utility model adopts the concept of assembled construction. The assembled energy wall 3 is a rectangular unit module, which can be standardized in the factory. Various models can be designed according to the area and thickness according to actual needs. Multiple unit modules are spliced in an array to form a large-area wall. The internal pipes of multiple unit modules are connected in series, such as Figure 5 and Figure 6 During construction, it is only necessary to splice the unit modules and connect the pipes to quickly build. The buried pipe layout is not restricted, and it can shorten the construction period, reduce the loss of building materials and waste of resources, and is easy to install and use, which can solve the shortcomings of the existing technology. Specifically, the internal pipes of each unit module are connected to the water supply and return main pipes using plug-in pipe fittings, such as Figure 4 .

[0052] The utility model has the following technical advantages:

[0053] (1) The prefabricated energy wall of the present invention is located in the cavity between the structural wall and the free-standing wall of the underground station, and is integrated with the underground enclosure structure for heat exchange, thus resolving the disadvantage of the large floor space occupied by the buried pipes of traditional ground-source heat pumps. In addition, the prefabricated energy wall of the present invention can transfer waste heat to the surrounding soil in the summer, replacing traditional cooling tower equipment and saving equipment investment and floor space.

[0054] (2) The utility model adds an air cavity layer and aluminum foil in the assembled wall, which can reduce the heat dissipation of the heat exchange pipe to the existing station side during cooling / heating conditions, reduce the heat loss of the entire system, and greatly improve the energy efficiency of the entire system.

[0055] (3) The prefabricated energy wall of this utility model is directly installed on the inner surface of the structural wall. It is easy to install and will not affect the mechanical properties of the structural wall, making it convenient to transform the energy system of existing subway stations. At the same time, the prefabricated standardized setting will shorten the construction period, improve the construction quality, and significantly reduce the carbon emission intensity of the building's entire life cycle.

[0056] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. For those skilled in the art of the present invention, some simple deductions, modifications or substitutions can be made based on the concept of the present invention.

Claims

1. A heat exchange and insulation integrated assembled energy wall system for a subway station, characterized by: It includes an assembled energy wall (3), a heat pump unit in a machine room (1), an air conditioning terminal (4) and a transmission and distribution system (2); The assembled energy wall (3) is located between the structural wall (6) and the wall-free wall (8) of the subway station and is close to the soil side (5); The assembled energy wall (3) is provided with an internal pipeline, and both ends of the internal pipeline are connected to the machine room heat pump unit (1) through the transmission and distribution system (2). After heat exchange in the machine room heat pump unit (1), the heat or cold is released into the soil, forming a first heat exchange loop; the air conditioning terminal (4) absorbs the cold or heat in the room and enters the machine room heat pump unit (1) through the transmission and distribution system (2), forming a second heat exchange loop, and performs energy transfer with the first heat exchange loop through the machine room heat pump unit (1).

2. The integrated heat exchange and insulation prefabricated energy wall system for a subway station according to claim 1 is characterized by: There is a gap between the assembled energy wall (3) and the separated wall (8), forming an air layer (7).

3. The integrated heat exchange and insulation prefabricated energy wall system for a subway station according to claim 1 is characterized by: The internal pipeline is a large-diameter heat exchange tube.

4. The integrated heat exchange and insulation prefabricated energy wall system for a subway station according to claim 3 is characterized by: The assembled energy wall (3) comprises a soaking plate (31) and an insulation plate (33); a buried pipe layer (32) is provided between the soaking plate (31) and the insulation plate (33); and the large-diameter heat exchange pipes are arranged in the buried pipe layer (32).

5. The integrated heat exchange and insulation prefabricated energy wall system for a subway station according to claim 4 is characterized by: The surface of the buried pipe layer (32) is provided with a pipe groove, and the large-diameter heat exchange pipe is embedded in the pipe groove.

6. The integrated heat exchange and insulation prefabricated energy wall system for a subway station according to claim 1 is characterized by: The internal pipeline is a capillary grid.

7. The integrated heat exchange and insulation prefabricated energy wall system for a subway station according to claim 6 is characterized by: The assembled energy wall (3) comprises a heat preservation board (33), a buried pipe layer (32) is provided on one side of the heat preservation board (33), and the capillary grid is arranged on the surface of the buried pipe layer (32).

8. The integrated heat exchange and insulation prefabricated energy wall system for a subway station according to claim 5 or 7, characterized in that: The buried pipe layer (32) is a cement fiber board.

9. The integrated heat exchange and insulation prefabricated energy wall system for a subway station according to claim 8, characterized in that: Aluminum foil (34) is applied to the surface of the heat-insulating plate (33).

10. The integrated heat exchange and insulation prefabricated energy wall system for a subway station according to claim 9, characterized in that: The assembled energy wall (3) is a rectangular unit module, and a plurality of the unit modules are spliced in an array to form a large-area wall, and the internal pipelines of the plurality of the unit modules are connected in series.

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