Underground station energy wall water loop heat pump air conditioning system and operation method thereof

Abstract

The invention relates to an underground station energy wall water loop heat pump air conditioning system and an operation method thereof, the underground station energy wall water loop heat pump air conditioning system comprises a heat pump unit, an assembly type energy wall system and a heat storage container, and the heat pump unit is a water-air heat pump unit; the heat pump unit is located in an equipment room, a station hall layer and a platform layer needing cooling or heating, the assembly type energy wall system is located in a cavity between a structural wall and an off-wall wall of an underground station, and the heat storage containers are located in the equipment rooms on the two sides of the station hall layer. The heat pump unit, the assembly type energy wall system and the heat storage container are all connected to the water loop. The fabricated energy wall is combined with the water loop heat pump air-conditioning system, geothermal energy serves as external energy of the water loop heat pump air-conditioning system and is used for replacing auxiliary cold and heat source equipment in a traditional water loop of the water loop heat pump, the occupied space of the equipment is reduced, and the energy-saving effect is obvious.

Description

Technical Field

[0001] The present invention relates to the technical field of building energy conservation, and in particular to an underground station energy wall water ring heat pump air conditioning system and an operation method thereof. Background Art

[0002] Underground buildings such as underground stations usually have some equipment rooms located in the inner area. The equipment has a large amount of heat dissipation and there is a lot of waste heat in winter, which requires cooling. At the same time, houses in the surrounding areas need heating due to the influence of outdoor meteorological parameters. When there is a demand for cooling and heating in the area at the same time, the waste heat in the building can be transferred through the water ring heat pump system, which can achieve good energy-saving effects.

[0003] Since the residual heat in the inner area is not large, it is necessary to add heating or cooling devices when using traditional water ring heat pump air conditioning systems. However, underground space resources are tight and the amount of excavation is large. How to combine the structural characteristics of underground buildings to develop heating and heat removal equipment with small footprint and low energy consumption is the key issue in solving the application of water ring heat pump air conditioning systems in underground stations. Existing energy walls include energy underground continuous walls and energy pile walls, and their buried pipe forms are limited by the steel cages in the continuous walls or structural piles. Therefore, it is necessary to propose new measures to overcome the above-mentioned defects. Summary of the invention

[0004] The purpose of the present invention is to provide an underground station energy wall water ring heat pump air conditioning system and an operation method thereof, so as to solve the problem of applying the water ring heat pump air conditioning system to underground buildings such as underground stations.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] An underground station energy wall water ring heat pump air conditioning system, the air conditioning system comprises a heat pump unit, an assembled energy wall system and a heat storage container, the heat pump unit is a water-air heat pump unit;

[0007] The heat pump unit is located in the equipment room, the station hall, and the platform floor that require cooling or heating; the prefabricated energy wall system is located in the cavity between the structural wall and the wall-free wall of the underground station; and the heat storage container is located in the equipment room on both sides of the station hall floor;

[0008] The heat pump unit, the assembled energy wall system and the heat storage container are all connected to a water loop.

[0009] Furthermore, the air conditioning system also includes a water treatment device and a make-up water tank, which are sequentially connected and accessed to the water loop between the assembled energy wall system and the heat pump unit.

[0010] Furthermore, the air conditioning system also includes a constant pressure device connected to the water loop between the assembled energy wall system and the heat pump unit.

[0011] Further, the assembled energy wall system includes an assembled energy wall, which is located between the structural wall and the wall-free wall of the underground station, close to the soil side, and close to the structural wall;

[0012] An air layer is left between the assembled energy wall and the wall away from the wall, and a vent is arranged on the top of the air layer and leads to the ground.

[0013] Furthermore, the assembled energy wall includes a buried pipe layer, the soil-closed side of the buried pipe layer is a heat spreader, the air-closed side of the buried pipe layer is an insulation board, and the outer side of the insulation board is covered with aluminum foil.

[0014] On the other hand, a method for operating an underground station energy wall water ring heat pump air conditioning system is provided, the method being implemented when the heat supply of the surrounding area is less than the residual heat of the inner area, comprising:

[0015] Open the valve on the pipeline of the heat storage container, and the heat storage container starts to operate;

[0016] Close the valves on the pipelines of the assembled energy wall system, and the assembled energy wall system stops running;

[0017] The residual heat in the inner area enters the water loop through the heat pump unit, and after supplying heat to the surrounding area, the remaining heat is stored in the heat storage container;

[0018] When the residual heat in the inner area is not enough to heat the surrounding areas, the heat storage container releases the stored heat into the water loop, raising the temperature of the water loop to heat the surrounding areas.

[0019] On the other hand, a method for operating an underground station energy wall water ring heat pump air conditioning system is provided, the method being implemented when the heat supply of the surrounding area is equal to the residual heat of the inner area, comprising:

[0020] Close the valve on the pipeline of the heat storage container, and the heat storage container stops running;

[0021] Close the valves on the pipelines of the assembled energy wall system, and the assembled energy wall system stops running;

[0022] The water loop is unobstructed, and the waste heat in the inner area enters the water loop through the heat pump unit to provide heating for the surrounding areas.

[0023] On the other hand, a method for operating an underground station energy wall water ring heat pump air conditioning system is provided, the method being implemented when the heat supply of the surrounding area is greater than the residual heat of the inner area, comprising:

[0024] The waste heat in the inner area enters the water loop through the heat pump unit, and after providing heat to the surrounding areas, the temperature of the water loop decreases;

[0025] Close the valve on the pipeline of the heat storage container, and the heat storage container stops running;

[0026] Open the valve on the pipeline of the assembled energy wall system, and the assembled energy wall system starts to operate;

[0027] The assembled energy wall system exchanges heat with the surrounding soil, absorbing heat from the soil to increase the temperature of the water loop and provide heat to the surrounding area.

[0028] On the other hand, a method for operating an underground station energy wall water ring heat pump air conditioning system is provided, the method being implemented when there is no waste heat in the inner area and both the inner area and the surrounding area need heating, comprising:

[0029] The heat pump units are all in heating condition, and the water loop temperature decreases;

[0030] Close the valve on the pipeline of the heat storage container, and the heat storage container stops running;

[0031] Open the valve on the pipeline of the assembled energy wall system, and the assembled energy wall system starts to operate;

[0032] The assembled energy wall system exchanges heat with the surrounding soil, absorbing heat from the soil to increase the temperature of the water loop and provide heat to the surrounding area.

[0033] On the other hand, a method for operating an underground station energy wall water ring heat pump air conditioning system is provided, the method being implemented when both the inner area and the surrounding area need cooling, comprising:

[0034] The heat pump units are all in cooling condition, and the water loop temperature rises;

[0035] Close the valve on the pipeline of the heat storage container, and the heat storage container stops running;

[0036] Open the valve on the pipeline of the assembled energy wall system, and the assembled energy wall system starts to operate;

[0037] The assembled energy wall system exchanges heat with the surrounding soil, dissipating heat into the surrounding soil to reduce the temperature of the water loop and provide cooling for the surrounding area.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention provides an underground station energy wall water ring heat pump air conditioning system and an operation method thereof, and adopts an assembled energy wall system as a geothermal energy development component. The underground heat exchange component does not occupy additional land resources, has little impact on the mechanical properties of the wall, and is not restricted in the layout of buried pipes. 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. In addition, the present invention designs an underground station energy wall water ring heat pump air conditioning system based on the assembled energy wall, uses geothermal energy as the external energy source of the water ring heat pump air conditioning system, and adopts an assembled energy wall to replace the boiler and cooling tower in the traditional water ring heat pump air conditioning system, which can achieve a good energy-saving effect, make full use of renewable energy, achieve environmental friendliness, and promote the realization of the "dual carbon goals" in the field of underground buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0041] Figure 1 It is a system structure diagram of the present invention.

[0042] Figure 2 This is a schematic diagram of the operation of the assembled energy wall system of the present invention. In the figure, A is the summer mode and B is the winter mode.

[0043] Figure 3 It is a schematic diagram of the installation of the assembled energy wall system of the present invention.

[0044] Figure 4 It is a structural diagram of the assembled energy wall of the present invention.

[0045] Figure 5 This is the system schematic diagram when the heat supply in the surrounding area is less than the residual heat in the inner area.

[0046] Figure 6 This is the system schematic diagram when the surrounding area heating is equal to the internal area residual heat.

[0047] Figure 7 This is the system schematic diagram when the heat supply in the surrounding area is greater than the residual heat in the inner area.

[0048] Figure 8 This is the system schematic diagram when both the inner area and the surrounding area are heated.

[0049] Fig. 9 This is the system schematic diagram when both the inner zone and the surrounding zone are cooled.

[0050] The symbols in the figure are:

[0051] 1-heat pump unit, 2-assembled energy wall system, 3-water loop circulating water pump, 4-heat storage container, 5-water treatment device, 6-feed water tank, 7-feed water pump, 8-constant pressure device, 9-water loop;

[0052] 21-soil side, 22-structural wall, 23-assembled energy wall, 24-air layer, 25-off-wall wall, 26-station side;

[0053] 231-heat sink, 232-buried pipe layer, 233-insulation board, 234-aluminum foil. DETAILED DESCRIPTION

[0054] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0055] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships 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.

[0056] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection", "setting", etc. should be understood in a broad sense, for example, it can be fixed connection, setting, or detachable connection, setting, or integral connection, setting. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] It should also be noted that although the order of steps is mentioned in the method description, in some cases, they may be performed in an order different from that shown here, and it should not be understood as a limitation on the order of steps.

[0058] In a specific implementation manner, the inner area refers to equipment rooms in underground buildings such as subway stations that have no external protective structures and have waste heat in winter that require cooling. The peripheral area refers to areas such as station halls and platform floors adjacent to the surrounding soil that have cooling needs in summer and heating needs in winter.

[0059] 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, low environmental pollution and low carbon emissions can be achieved to meet the needs of green building development. Based on the concept of assembled buildings, the present invention provides an underground station energy wall water ring heat pump air-conditioning system, which exchanges heat with the surrounding soil through heat exchange pipes laid on the surface of the structural wall to achieve the purpose of cooling or heating the subway station.

[0060] like Figure 1 The system includes a heat pump unit 1, an assembled energy wall system 2 and a heat storage container 4, as well as other auxiliary equipment, including pipelines, valves, water pumps, etc.

[0061] The heat pump unit 1 is located in the equipment room, station hall and platform floors that require cooling or heating. It is a water-air heat pump unit with cooling mode and heating mode. The heat exchange medium of the heat exchanger connected to the water loop 9 is water-refrigerant, and the heat exchange medium of the indoor heat exchanger is refrigerant-air. The heat pump unit 1 is installed in the inner area and the surrounding area, and the corresponding number of heat pumps are deployed in each area according to the actual cooling and heating demand.

[0062] The assembled energy wall system 2 is located in the cavity between the structural wall 22 and the wall 25 of the underground station, and includes an assembled energy wall 23. The assembled energy wall 23 is located between the structural wall 22 and the wall 25 of the underground station, close to the soil side 1, and close to the structural wall 22. An air layer 24 is left between the assembled energy wall 23 and the wall 25. A vent is provided at the top of the air layer 24 for exhaust and leading to the ground. An air inlet is provided at the lower part of the air layer 24, which is installed at the lower part of the wall to serve as a supplementary air for the upper exhaust. The assembled energy wall 23 includes a buried pipe layer 232, the soil side of the buried pipe layer 232 is a heat spreader 231, the air side of the buried pipe layer 232 is an insulation board 233, and the outer side of the insulation board 233 is affixed with aluminum foil 234.

[0063] The structural wall 22 is a commonly used reinforced concrete structure with a thickness of 700-1000mm. The specific method is in accordance with the relevant requirements of the building. The wall away from the wall is also called a moisture-proof wall, which is another wall set on the inner side of the structural outer wall. Its main purpose is to eliminate and reduce the impact of water leakage from the outer wall on the use and aesthetics of the internal space. In public areas, enameled steel plates, porcelain aluminum plates, stones and other materials are mostly used to dry-hang to form the wall away from the wall. In the equipment management area, fiber cement boards, calcium silicate boards and other cement product boards are mostly used to dry-hang as the wall away from the wall. In the present invention, the wall away from the wall adopts 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 is sprayed with a low-emissivity coating or laid with a low-emissivity smooth aluminum-tin film, and the coating surface is smoothed to reduce the radiation heat exchange between the inner surface of the cavity side of the away wall and other surfaces and the convection heat exchange between the inner surface of the cavity side of the away wall and the air in the cavity, thereby reducing the heat transfer of the energy wall heat exchange pipe through the cavity between the assembled energy wall and the away wall and the away wall into the station.

[0064] The air layer 24 is equivalent to the waterproof layer and the second layer of thermal insulation material of the energy wall system. Its thickness is 100-250mm. Its function is to prevent groundwater from penetrating into the station and reduce the heat transfer from the energy wall to the station side. 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.

[0065] The buried pipe layer 232 of the assembled energy wall 23 is provided with internal pipes, which exchange heat with the surrounding soil to extract heat / cold from the soil and discharge it into the water loop of the water loop heat pump, so that the water temperature in the water loop increases / decreases. The heat pump units distributed in the inner and outer zones exchange heat with the water loop to extract heat / cold, so as to achieve the purpose of cooling or heating the subway station. The internal pipes can be in the form of large-diameter heat exchange pipes or capillaries:

[0066] Embodiment 1:

[0067] When the internal pipeline is a large-diameter heat exchange tube, the assembled energy wall 23 includes a heat spreader 231 and an insulation board 233, and a buried pipe layer 232 is provided between the heat spreader 231 and the insulation board 233, and the large-diameter heat exchange tube is arranged in the buried pipe layer 232. The buried pipe layer 232 is a cement fiber board, and a pipe groove is provided on the surface, and the large-diameter heat exchange tube is embedded in the pipe groove.

[0068] In this embodiment, a heat spreader 231 is provided to increase the uniformity of heat transfer, and the thickness is 2 mm. The heat spreader 231 allows heat to diffuse more evenly to the surrounding soil, so that the heat exchange capacity of the heat exchange tube is stronger. Copper plate, aluminum plate, aluminum alloy and stainless steel can all be used as heat spreader materials. Since copper has good ductility and stronger thermal conductivity, the present invention preferably uses copper plate as the heat spreader, which has good thermal conductivity.

[0069] Embodiment 2:

[0070] When the internal pipeline is a capillary grid, the assembled energy wall 23 includes an insulation board 233, a buried pipe layer 232 is provided on one side of the insulation board 233, and the capillary grid is arranged on the other side of the buried pipe layer 232. The buried pipe layer 232 is a cement fiber board, and the capillary grid is bonded to the surface of the buried pipe layer 232.

[0071] 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 231 is provided, and the buried pipe layer 232 is directly in close contact with the inner side of the structural wall 22 (the indoor space side).

[0072] In the above two embodiments, the buried pipe layer panel is made of cement fiberboard with a thickness of 50mm. When a large-diameter heat exchange tube is used, a heat exchange tube groove is prefabricated on the panel to facilitate the arrangement of the heat exchange tube, and the tube faces one side of the heat spreader. The branch pipe groove is arranged horizontally in a serpentine shape, and the main pipe is arranged vertically. Holes for connecting the branch pipe with the supply and return water main pipe are reserved on the panel. The heat exchange coil is made of high-temperature, pressure-resistant and corrosion-resistant cross-linked polyethylene pipe (Pe-Xa pipe for short), with an outer diameter of 25mm and a wall thickness of 2.3mm. The spacing between the heat exchange tubes should be 0.3m, and a certain length is reserved for the inlet and outlet of the heat exchange tube, extending out of the panel to facilitate the connection with the manifold later. During the wall transportation process, a rubber plug is used to block the pipe mouth to prevent impurities and foreign objects from entering the pipe and blocking the pipe. The rubber plug is removed after the installation is completed. When using capillary tubes as heat exchange tubes, the capillary mesh material is polypropylenerandom (PP-R), 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. The main pipeline reserves a horizontal pipe groove, the capillary mesh is installed close to the cement fiberboard, and the capillary mesh plastic buckle is tightly adhered to the surface of the cement fiberboard with an adhesive.

[0073] In the above two embodiments, the insulation board 233 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 to the station. The insulation board 233 uses extruded polystyrene foam insulation board (XPS) with a thickness of 80 mm. XPS has a low thermal conductivity, good thermal insulation performance, compression resistance and impact resistance, and extremely low water absorption, and excellent moisture-proof, corrosion-resistant and anti-penetration properties. The surface of the insulation board 233 is affixed with aluminum foil 234, 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.

[0074] The layers of the assembled 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 inside or on the surface of the panel to avoid rupture of the water pipes.

[0075] The thickness of the entire assembled energy wall 23 is 130-135mm, and the sizes are 2.4*1.2m and 1.2*1.2m. The installation method is to directly fix the assembled energy wall to the structural wall with screws, while paying attention to avoid the position of the pipeline laid in the wall. The bottom is close to the inner side of the structural wall, and the aluminum foil film side of the insulation layer is exposed in the cavity.

[0076] The assembled energy wall 23 is a rectangular unit module that can be produced in a standardized manner 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, and the internal pipes of multiple unit modules are connected in series. During construction, it is only necessary to splice the unit modules and connect the pipes to quickly build it. The buried pipe layout is not restricted, and at the same time 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 pipeline of each unit module is connected to the supply and return water main pipeline using plug-in pipe fittings.

[0077] The heat storage container 4 is located in the equipment room on both sides of the station hall, specifically refers to the heat storage tank / tank. The heat storage tank / tank is made of stainless steel and is equipped with insulation materials. The function of the heat storage tank / tank is to temporarily store excess heat. When the heat that needs to be transferred in the inner area is not balanced with the heat supply required by the surrounding area in time, the heat can be temporarily stored in the water loop by setting up a heat storage tank to realize the transfer of heat in time.

[0078] The heat pump unit 1, the assembled energy wall system 2 and the heat storage container 4 are connected to the water loop 9 in sequence. The pipelines on both sides of the assembled energy wall system 2 are provided with valves 1 and 3, and the pipelines on both sides of the heat storage container 4 are provided with valves 4 and 5. The water loop connected in parallel with the assembled energy wall system 2 is provided with valve 2. The water loop 9 is also provided with a water loop circulating water pump 3, which is located between the assembled energy wall system 2 and the heat pump unit 1.

[0079] The air conditioning system of the present invention also includes a water treatment device 5, a feed water tank 6 and a feed water pump 7, which are sequentially connected and accessed to the pipeline between the assembled energy wall system 2 and the heat pump unit 1, and the access point is located before the water loop circulating water pump 3.

[0080] In addition, the air conditioning system of the present invention also includes a constant pressure device 8, which is connected to the pipeline between the assembled energy wall system 2 and the heat pump unit 1 and is located at the inlet of the circulating water pump 3. The constant pressure device 8 is specifically an expansion water tank or a pressure tank. When an expansion water tank is used, the water tank is located at the highest point of the system. When the expansion water tank is inconvenient to use and install, a pressure tank can be used. The constant pressure device 8 stabilizes the system pressure within a certain range to prevent water from being emptied or vaporized. When the system pressure is reduced due to water loss caused by sewage discharge and system dripping, the system needs to be replenished with water. When an expansion water tank is used for constant pressure, the system is directly replenished with water through the expansion water tank. When a pressure tank is used for constant pressure, the system is replenished with water by automatically pumping water from the supply water tank 6 through the supply water pump 7 to ensure the stability of the system pressure.

[0081] This system makes full use of the cavity between the structural wall and the free wall of the underground station, installs the assembled energy wall system in the cavity, and forms a subway station energy wall heat exchanger as a heat removal and heating device for the water ring heat pump air conditioning system of the subway station. It can be used for new subway stations and can also be convenient for the transformation of the energy system of existing underground stations. This technology does not require additional drilling and drilling, which reduces costs and can make reasonable use of underground space. This system uses geothermal energy as an external energy source for the water ring heat pump air conditioning system, and uses an energy wall system to replace the cooling tower or boiler in the traditional water ring heat pump air conditioning system. It can achieve good energy-saving effects, make full use of renewable energy, achieve environmental friendliness, and promote the realization of the "dual carbon goals" in the field of underground buildings. In addition, this technology greatly reduces the construction difficulty of traditional energy walls, avoids wet operations, is easy to install, has a short operation cycle, saves resources, and has significant environmental benefits.

[0082] The core component of the system of the present invention is the assembled energy wall system 2, and its operating principle is as follows: Figure 2 As shown. In summer cooling, the prefabricated energy wall system 2 starts to operate. At this time, the prefabricated energy wall system 2 is equivalent to a cooling tower, which releases the condensation heat absorbed in the water loop into the soil through the embedded pipes in the energy wall; in winter heating, when the residual heat in the inner area is not enough to meet the heating of the surrounding areas or all areas need heating, the prefabricated energy wall system 2 starts to operate. At this time, the prefabricated energy wall system 2 is equivalent to a heater, absorbing heat from the soil to heat the water in the water loop.

[0083] The present invention utilizes the cavity between the assembled energy wall and the wall-free wall, and arranges a vent at the upper and lower parts thereof, respectively, and utilizes the chimney effect to form thermal pressure natural ventilation. In summer, the upper and lower vents are opened, the upper vent is the exhaust vent, and the lower vent is equivalent to the air supply vent. When the energy wall is in operation, the air in the cavity is heated, and the hot air rises, forming an airflow from bottom to top, and the air heated by the energy wall in the cavity is discharged, and the temperature in the cavity is naturally cooled and reduced, reducing the impact on the thermal environment in the station; in winter, the upper and lower vents are closed, the airflow speed in the cavity is reduced, the temperature rises, and the thermal insulation performance of the cavity is enhanced.

[0084] Specifically, this system has the following operating modes:

[0085] Mode 1: Transition season, the heat demand in the surrounding area is less than the residual heat in the inner area

[0086] The operation process is:

[0087] When the residual heat in the inner zone is large and the heat supply required in the peripheral zone is small, the temperature of the water loop 9 rises and exceeds 35°C.

[0088] At this time, if Figure 5 :

[0089] The valves 4 and 5 on the pipeline of the heat storage container 4 are opened, and the heat storage container 4 starts to operate.

[0090] Close valves 1 and 3 on the pipeline of the prefabricated energy wall system 2, and the prefabricated energy wall system 2 stops running.

[0091] The residual heat in the inner zone enters the water loop 9 through the heat pump unit 1, and after supplying heat to the surrounding area, the remaining heat is stored in the heat storage container 4;

[0092] When the residual heat in the inner zone is insufficient to heat the surrounding zone, that is, the temperature in the water loop 9 is lower than 15°C, the heat storage container 4 releases the stored heat into the water loop 9, thereby raising the temperature of the water loop 9 to heat the surrounding zone.

[0093] Mode 2: In winter, the inner area has excess heat, and the required heating of the surrounding area is equal to the excess heat of the inner area.

[0094] The operation process is:

[0095] In early winter, when the surrounding areas do not need too much heating and the waste heat in the inner area can just meet the heating needs of the surrounding areas, the temperature of the water loop 9 is stabilized at 15-35°C.

[0096] At this time, if Figure 6 :

[0097] Close valves 4 and 5 on the pipeline of the heat storage container 4, and the heat storage container 4 stops running;

[0098] Close valves 1 and 3 on the pipeline of the assembled energy wall system 2, and the assembled energy wall system 2 stops running;

[0099] Valve 2 is opened, water loop 9 is unblocked, and the waste heat in the inner area enters the water loop through the heat pump unit 1 to provide heat for the surrounding area.

[0100] Because the waste heat in the inner area can just meet the heating needs of the surrounding areas, there is no need for auxiliary cooling towers or heating equipment to exhaust or heat

[0101] Mode 3: In winter, the inner area has excess heat, and the surrounding area's heating demand is greater than the inner area's excess heat.

[0102] When the heat supply required by the surrounding area is large in winter, valves 4 and 5 on the pipeline of the heat storage container 4 are closed, and the heat storage container 4 does not operate;

[0103] The waste heat in the inner zone enters the water loop through the heat pump unit to provide heating for the surrounding areas, but the waste heat in the inner zone is less than the heating supply of the surrounding areas, resulting in a decrease in temperature in the water circulation loop. After running for a period of time, the temperature is lower than 15°C.

[0104] At this time, if Figure 7 :

[0105] Open valves 1 and 3 on the pipeline of the assembled energy wall system 2, and the assembled energy wall system 2 starts to operate;

[0106] Close valve 2, and the assembled energy wall system 2 will exchange heat with the surrounding soil, absorb the heat in the soil and discharge it into the water loop 9, so that the temperature of the water loop 9 will rise and be maintained above 15°C, continuing to provide heat to the surrounding area.

[0107] Mode 4: In winter, there is no residual heat in the inner area, and both the inner area and the surrounding area need heating.

[0108] The heat pump units 1 are all in heating operation, and the temperature of the water loop 9 decreases to below 15°C.

[0109] At this time, if Figure 8 :

[0110] Close valves 4 and 5 on the pipeline of the heat storage container 4, and the heat storage container 4 does not operate;

[0111] Open valves 1 and 3 on the pipeline of the assembled energy wall system 2, and the assembled energy wall system 2 starts to operate;

[0112] Close valve 2, and the assembled energy wall system 2 will exchange heat with the surrounding soil, absorbing the heat in the soil to raise the temperature of the water loop 9 to above 15°C, thus providing heat for the inner and surrounding areas.

[0113] Mode 5: In summer, both the inner and outer areas require cooling

[0114] The heat pump units 1 are all in cooling operation, and all units discharge the condensation heat into the water loop 9. The water loop temperature rises and is higher than 35°C.

[0115] At this time, if Fig. 9 :

[0116] Close valves 4 and 5 on the pipeline of the heat storage container 4, and the heat storage container 4 does not operate;

[0117] Open valves 1 and 3 on the pipeline of the assembled energy wall system 2, and the assembled energy wall system 2 starts to operate;

[0118] Close valve 2, and the assembled energy wall system 2 will exchange heat with the surrounding soil, dissipating the heat carried by the water loop into the surrounding soil to reduce the temperature of the water loop and maintain it below 35°C, providing cooling for the inner and surrounding areas.

[0119] In the operation of this system, when the circulating water system flow is small, the fixed flow operation mode can be adopted; when the system flow is large, the variable flow operation mode should be adopted. When the variable flow operation mode is adopted, the circulating water pipeline of the unit should be equipped with a switch-type electric valve that is interlocked with the start and stop control of the unit.

[0120] The present invention has the following technical advantages:

[0121] (1) The assembled energy wall of the present invention serves as an underground heat exchanger, which is located in the cavity between the structural wall and the wall away from the underground station and is combined with the underground retaining structure. It does not occupy any additional underground space, thus saving land resources. It makes up for the disadvantage of the traditional vertically drilled buried pipe heat exchanger that occupies a large area and promotes the efficient use of underground space.

[0122] (2) The assembled energy wall of the present invention can transfer waste heat to the surrounding soil and be used as an auxiliary heat dissipation device for the water ring heat pump, replacing the cooling tower in the traditional water ring heat pump air conditioning system. The assembled energy wall of the present invention can also extract geothermal energy from the soil for heating and be used as an auxiliary heating device for the water ring heat pump, replacing the high-potential heating equipment such as electric boilers and gas boilers used in traditional water ring heat pumps. Compared with traditional auxiliary cold and heat source equipment, it makes full use of renewable energy as an external supplementary energy source for the water ring heat pump air conditioning system, which has significant energy-saving and carbon-reduction effects.

[0123] (3) The assembled energy wall of the present invention is simple to manufacture and can be 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. At the same time, it greatly reduces the construction difficulty of the traditional energy wall, shortens the construction period, and facilitates the transformation of the energy system of the existing subway station.

[0124] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. An underground station energy wall water ring heat pump air conditioning system, characterized by: The air conditioning system comprises a heat pump unit (1), an assembled energy wall system (2) and a heat storage container (4), wherein the heat pump unit (1) is a water-to-air heat pump unit; The heat pump unit (1) is located in an equipment room, a station hall, or a platform floor that requires cooling or heating; the assembled energy wall system (2) is located in a cavity between a structural wall (22) and a free-standing wall (25) of an underground station; and the heat storage container (4) is located in equipment rooms on both sides of the station hall floor; The heat pump unit (1), the assembled energy wall system (2) and the heat storage container (4) are all connected to a water loop (9).

2. According to claim 1, the underground station energy wall water ring heat pump air conditioning system is characterized by: The air conditioning system also includes a water treatment device (5) and a make-up water tank (6), which are sequentially connected and accessed to the water loop (9) between the assembled energy wall system (2) and the heat pump unit (1).

3. The underground station energy wall water ring heat pump air conditioning system according to claim 2 is characterized by: The air conditioning system also includes a constant pressure device (8) connected to the water loop (9) between the assembled energy wall system (2) and the heat pump unit (1).

4. The underground station energy wall water ring heat pump air conditioning system according to claim 1 is characterized by: The assembled energy wall system (2) comprises an assembled energy wall (23), wherein the assembled energy wall (23) is located between a structural wall (22) and a wall (25) of an underground station, close to a soil side (1), and closely attached to the structural wall (22); An air layer (24) is left between the assembled energy wall (23) and the wall (25), and a vent is provided at the top of the air layer (24) leading to the ground.

5. The underground station energy wall water ring heat pump air conditioning system according to claim 4 is characterized by: The assembled energy wall (23) comprises a buried pipe layer (232), the soil-closed side of the buried pipe layer (232) is a heat diffusion plate (231), the air-closed side of the buried pipe layer (232) is a heat preservation plate (233), and the outer side of the heat preservation plate (233) is affixed with aluminum foil (234).

6. The method for operating an underground station energy wall water ring heat pump air conditioning system according to any one of claims 1 to 5, characterized in that: The method is implemented when the heat supply of the peripheral zone is less than the residual heat of the inner zone, and comprises: The valve on the pipeline of the heat storage container (4) is opened, and the heat storage container (4) starts to operate; The valve on the pipeline of the assembled energy wall system (2) is closed, and the assembled energy wall system (2) stops running; The residual heat in the inner zone enters the water loop (9) through the heat pump unit (1) and supplies heat to the surrounding zone, and the remaining heat is stored in the heat storage container (4); When the residual heat in the inner zone is insufficient to provide heat to the surrounding zone, the heat storage container (4) releases the stored heat to the water loop (9), thereby increasing the temperature of the water loop (9) to provide heat to the surrounding zone.

7. An operating method for an underground station energy wall water ring heat pump air conditioning system according to any one of claims 1 to 5, characterized in that: The method is implemented when the heat supply of the peripheral zone is equal to the residual heat of the inner zone, and comprises: The valve on the pipeline of the heat storage container (4) is closed, and the heat storage container (4) stops operating; The valve on the pipeline of the assembled energy wall system (2) is closed, and the assembled energy wall system (2) stops running; The water loop (9) is unobstructed, and the waste heat in the inner area enters the water loop (9) through the heat pump unit (1) to provide heat for the surrounding area.

8. An operating method for an underground station energy wall water ring heat pump air conditioning system according to any one of claims 1 to 5, characterized in that: The method is implemented when the heat supply of the peripheral zone is greater than the residual heat of the inner zone, and comprises: The waste heat in the inner zone enters the water loop (9) through the heat pump unit (1) and supplies heat to the surrounding zone, and the temperature of the water loop (9) decreases; The valve on the pipeline of the heat storage container (4) is closed, and the heat storage container (4) stops operating; The valve on the pipeline of the assembled energy wall system (2) is opened, and the assembled energy wall system (2) starts to operate; The assembled energy wall system (2) exchanges heat with the surrounding soil, absorbs heat from the soil to increase the temperature of the water loop (9), and provides heat for the surrounding area.

9. An operating method for an underground station energy wall water ring heat pump air conditioning system according to any one of claims 1 to 5, characterized in that: The method is implemented when there is no waste heat in the inner zone and both the inner zone and the surrounding zone need to be heated, and comprises: The heat pump units (1) are all in heating operation, and the temperature of the water loop (9) decreases; The valve on the pipeline of the heat storage container (4) is closed, and the heat storage container (4) stops operating; The valve on the pipeline of the assembled energy wall system (2) is opened, and the assembled energy wall system (2) starts to operate; The assembled energy wall system (2) exchanges heat with the surrounding soil, absorbs heat from the soil to increase the temperature of the water loop (9), and provides heat for the surrounding area.

10. An operating method for an underground station energy wall water ring heat pump air conditioning system according to any one of claims 1 to 5, characterized in that: The method is implemented when both the inner zone and the surrounding zone need cooling, and comprises: The heat pump units (1) are all in cooling operation, and the temperature of the water loop (9) increases; The valve on the pipeline of the heat storage container (4) is closed, and the heat storage container (4) stops operating; The valve on the pipeline of the assembled energy wall system (2) is opened, and the assembled energy wall system (2) starts to operate; The assembled energy wall system (2) exchanges heat with the surrounding soil, discharges heat into the surrounding soil, reduces the temperature of the water loop (9), and provides cooling for the surrounding area.

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