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

Abstract

The present application relates to a kind of underground station energy wall water cycle heat pump air conditioning system and its operating method, including heat pump unit, fabricated energy wall system and heat storage container, and heat pump unit is water-air heat pump unit;Heat pump unit is located in the equipment room, station hall layer, platform layer needing cooling or heating supply, fabricated energy wall system is located in the cavity between the structure wall and off-wall of underground station, and heat storage container is located in the equipment room of station hall layer two sides;Heat pump unit, fabricated energy wall system and heat storage container are all connected on water loop.The present application combines fabricated energy wall with water cycle heat pump air conditioning system, and uses geothermal energy as the external energy of water cycle heat pump air conditioning system, to replace the auxiliary cold and heat source equipment in the traditional water cycle heat pump water loop, reduces the equipment land space, and energy-saving effect is obvious.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building energy saving, in particular to an underground station energy wall water loop heat pump air conditioning system and a running method thereof. BACKGROUND

[0002] The underground buildings such as underground stations usually have some equipment rooms in the inner area, and the equipment generates a large amount of heat, which needs to be cooled in winter. At the same time, the surrounding buildings need to be heated 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 water loop heat pump system can transfer the heat in the building, which can achieve good energy saving effect.

[0003] Due to the small amount of heat in the inner area, a heating or cooling device needs to be supplemented when using the traditional water loop heat pump air conditioning system. However, the underground space is limited and the excavation amount is large, so how to combine the structural characteristics of the underground building to develop a heating and heat removal device with small footprint and low energy consumption is a key problem to solve the application of the water loop heat pump air conditioning system in the underground station. The existing energy wall includes energy underground continuous wall and energy pile wall, and the pipe burying form is limited by the reinforcement cage in the continuous wall or structural pile. Therefore, it is necessary to propose new measures to overcome the above-mentioned defects. SUMMARY

[0004] The purpose of the present application is to provide an underground station energy wall water loop heat pump air conditioning system and a running method thereof to solve the problem of the application of the water loop heat pump air conditioning system in the underground station and other underground buildings.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] An underground station energy wall water loop 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, station hall layer and platform layer which need to be cooled or heated, the assembled energy wall system is located in the cavity between the structural wall and the off-wall wall of the underground station, and the heat storage container is located in the equipment room on both sides of the station hall layer.

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

[0009] Further, the air conditioning system further comprises a water treatment device and a make-up water tank, which are connected in sequence and connected to the water loop between the assembled energy wall system and the heat pump unit.

[0010] Further, the air conditioning system further comprises 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 comprises an assembled energy wall, which is located between the structural wall and the off-wall of the underground station and close to the soil side, and is close to the structural wall.

[0012] An air layer is left between the assembled energy wall and the off-wall, and a ventilation opening is arranged at the top of the air layer and leads to the ground.

[0013] Further, the assembled energy wall comprises a pipe laying layer, the soil side of the pipe laying layer is a heat equalizing plate, the air side of the pipe laying layer is a heat preservation plate, and the outer side of the heat preservation plate is attached with an aluminum foil.

[0014] In another aspect, a method for operating an underground station energy wall water loop heat pump air conditioning system is provided, the method is implemented when the heat supply of the peripheral area is less than the residual heat of the inner area, comprising:

[0015] Opening the valve on the pipe of the heat storage container, the heat storage container starts to operate;

[0016] Closing the valve on the pipe of the assembled energy wall system, the assembled energy wall system stops operating;

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

[0018] When the residual heat of the inner area is insufficient to heat the peripheral area, the heat storage container releases the stored heat to the water loop to increase the temperature of the water loop to heat the peripheral area.

[0019] In another aspect, a method for operating an underground station energy wall water loop heat pump air conditioning system is provided, the method is implemented when the heat supply of the peripheral area is equal to the residual heat of the inner area, comprising:

[0020] Closing the valve on the pipe of the heat storage container, the heat storage container stops operating;

[0021] Closing the valve on the pipe of the assembled energy wall system, the assembled energy wall system stops operating;

[0022] The water loop is unobstructed, and the residual heat of the inner area enters the water loop through the heat pump unit to heat the peripheral area.

[0023] In another aspect, a method for operating an underground station energy wall water loop heat pump air conditioning system is provided, the method is implemented when the heat supply of the peripheral area is greater than the residual heat of the inner area, comprising:

[0024] The residual heat of the inner area enters the water loop through the heat pump unit to heat the peripheral area, and the temperature of the water loop decreases;

[0025] Closing the valve on the pipe of the heat storage container, the heat storage container stops operating;

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

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

[0028] On the other hand, a method for operating an underground station energy wall water loop heat pump air conditioning system is provided, which is implemented when there is no residual heat in the inner area and the inner area and the surrounding area need to be heated, and the method comprises the following steps:

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

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

[0031] The valve on the pipeline of the assembled energy wall system is opened, and the assembled energy wall system starts to run;

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

[0033] On the other hand, a method for operating an underground station energy wall water loop heat pump air conditioning system is provided, which is implemented when the inner area and the surrounding area need to be cooled, and the method comprises the following steps:

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

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

[0036] The valve on the pipeline of the assembled energy wall system is opened, and the assembled energy wall system starts to run;

[0037] The assembled energy wall system exchanges heat with the surrounding soil, and the heat is discharged to the surrounding soil to reduce the temperature of the water loop, and the surrounding area is cooled.

[0038] Compared with the prior art, the beneficial effects of the present application are as follows:

[0039] The application provides an underground station energy wall water loop heat pump air conditioning system and a running method thereof, and adopts an assembled energy wall system as a ground heat energy development component. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

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

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

[0043] Figure 3 is an installation schematic diagram of the assembled energy wall system of the present application.

[0044] Figure 4 is a structure diagram of the assembled energy wall of the present application.

[0045] Figure 5 is a system principle diagram when the heat supply of the peripheral area is less than the residual heat of the inner area.

[0046] Figure 6 is a system principle diagram when the heat supply of the peripheral area is equal to the residual heat of the inner area.

[0047] Figure 7 is a system principle diagram when the heat supply of the peripheral area is greater than the residual heat of the inner area.

[0048] Figure 8 is a system principle diagram when the inner area and the peripheral area are both heated.

[0049] Figure 9 is a system principle diagram when the inner area and the peripheral area are both cooled.

[0050] Identified in the figure as:

[0051] 1- heat pump unit, 2- assembled energy wall system, 3- water loop circulating pump, 4- heat storage container, 5- water treatment device, 6- make-up water tank, 7- make-up water pump, 8- pressure regulating 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 plate, 232- pipe layer, 233- insulation plate, 234- aluminum foil. DETAILED DESCRIPTION

[0054] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application 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 application more thorough and comprehensive.

[0055] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0056] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "provided" and the like should be understood broadly, for example, it can be fixedly connected, provided, or detachably connected, provided, or integrally connected, provided. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

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

[0058] In the detailed description, the inner zone refers to the equipment room without peripheral support structure in the underground building such as subway station, which needs cooling in winter, and the peripheral zone refers to the station hall and platform layer and other areas adjacent to the surrounding soil, which have cooling demand in summer and heating demand in winter.

[0059] Prefabricated building is the development direction of future building. Most of the construction work of prefabricated building is carried out in the factory, so the construction period of prefabricated building is shorter than that of traditional cast-in-situ building. At the same time, low environmental pollution and low carbon emission can be realized, meeting the needs of green building development. Based on the concept of prefabricated building, the underground station energy wall water ring heat pump air conditioning system is provided, the heat exchange pipe laid on the surface of the structure wall exchanges heat with the surrounding soil, and the purpose of cooling or heating for the subway station is achieved.

[0060] As Figure 1 , the system comprises a heat pump unit 1, a prefabricated energy wall system 2 and a heat storage container 4, and other auxiliary equipment, including pipelines, valves, water pumps and the like.

[0061] The heat pump unit 1 is located in the equipment room and station hall layer and platform layer needing cooling or heating, and is a water-air heat pump unit with refrigeration mode and heating mode. The heat exchange medium of the heat exchanger connected with 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 peripheral area, and a corresponding number of heat pumps are deployed in each area according to the actual cooling and heating demand.

[0062] The prefabricated energy wall system 2 is located in the cavity between the structure wall 22 and the off-wall wall 25 of the underground station, and comprises a prefabricated energy wall 23. The prefabricated energy wall 23 is located between the structure wall 22 and the off-wall wall 25 of the underground station, and is close to the soil side 21 and close to the structure wall 22. An air layer 24 is left between the prefabricated energy wall 23 and the off-wall wall 25, and a ventilation opening is arranged at the top of the air layer 24 for exhaust air and leading to the ground. An air inlet is arranged at the lower part of the air layer 24 and is installed at the lower part of the off-wall wall as the air supplement of the upper exhaust air. The prefabricated energy wall 23 comprises a pipe laying layer 232, the soil side of the pipe laying layer 232 is a heat equalizing plate 231, the air side of the pipe laying layer 232 is a heat preservation plate 233, and the outer side of the heat preservation plate 233 is coated with an aluminum foil 234.

[0063] The structural wall 22 is a common reinforced concrete structure with a thickness of 700-1000 mm, and the specific method is according to the relevant requirements of building. The off-wall wall, also known as the damp-proof wall, is a wall arranged on the inner side of the structural outer wall. The main purpose is to eliminate and reduce the influence of water leakage of the outer wall on the interior space use and aesthetics. In the public area, the off-wall wall is formed by dry hanging of materials such as enamel steel plate, baked enamel aluminum plate, and stone. In the equipment management area, the off-wall wall is dry hung as a off-wall wall by using cement fiber board, calcium silicate board and other cement product boards. In the present application, the off-wall wall uses cement fiber board with a thickness of 50-100 mm. The cement fiber board has higher strength, lower surface water absorption rate and good sound insulation effect. The inner surface of the cavity side of the off-wall wall is sprayed with a low-emissivity coating or laid with a low-emissivity smooth aluminum tin film, and the surface of the coating is smoothly treated, so as to reduce the radiation heat transfer between the inner surface of the cavity side of the off-wall wall and other surfaces and the convection heat transfer between the inner surface of the cavity side of the off-wall wall and the air in the cavity, thereby reducing the heat transfer amount of the energy wall heat exchange pipe through the cavity between the assembled energy wall and the off-wall wall into the station.

[0064] The air layer 24 corresponds to the waterproof layer and the second layer of thermal insulation material of the energy wall system, with a thickness of 100-250 mm, and functions to prevent groundwater from seeping into the interior of the station and to reduce the heat transfer amount of the energy wall to the station side. When the energy wall system is arranged in the public area of the station, the cavity thickness is 200-250 mm. When the energy wall system is arranged in the equipment and management room of the station, the cavity thickness is 100-150 mm.

[0065] The buried pipe layer 232 of the assembled energy wall 23 is provided with an internal pipe, which exchanges heat with the surrounding soil to extract heat / cold from the soil, and is discharged into the water loop of the water ring heat pump, so that the water temperature in the water loop is raised / lowered, and each heat pump unit distributed in each internal area and external area exchanges heat with the water loop to extract heat / cold, so as to achieve the purpose of providing cooling or heating for the subway station. The internal pipe can adopt two forms of large-diameter heat exchange pipe or capillary tube:

[0066] Embodiment 1:

[0067] When the internal pipe is a large-diameter heat exchange pipe, the assembled energy wall 23 comprises a heat equalizing plate 231 and a thermal insulation plate 233, and the buried pipe layer 232 is arranged between the heat equalizing plate 231 and the thermal insulation plate 233. The buried pipe layer 232 is a cement fiber board, and the surface is provided with a pipe groove, and the large-diameter heat exchange pipe is embedded in the pipe groove.

[0068] In this embodiment, the heat equalizing plate 231 is arranged to increase the uniformity of heat transfer, and the thickness is 2 mm. The heat equalizing plate 231 makes the heat more uniformly spread to the surrounding soil, so that the heat exchange capacity of the heat exchange pipe is stronger. Copper plate, aluminum plate, aluminum alloy and stainless steel can be used as the material of the heat equalizing plate. Since copper has good ductility and stronger heat conduction capacity, the present application preferably uses copper plate as the heat equalizing plate, which has good heat conduction performance.

[0069] Example 2:

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

[0071] In this embodiment, the capillary tube spacing is very small (5mm-40mm), the heat exchange area is large, and the heat exchange is uniform, so the heat spreading plate 231 is not arranged, and the pipe-embedded layer 232 is directly attached to the inside of the structural wall 22 (the indoor space side).

[0072] In the above two examples, the pipe-embedded layer panel is a cement fiber board with a thickness of 50mm. When a large-diameter heat exchange pipe is used, a precast heat exchange pipe groove is provided on the panel to facilitate the arrangement of the heat exchange pipe, and the pipe faces the side of the heat spreading plate. The branch pipe groove is arranged horizontally in a serpentine shape, and the main pipe is arranged vertically. The panel is pre-drilled with holes for connecting the branch pipe to the water supply and return pipe. The heat exchange coil is made of cross-linked polyethylene pipe (abbreviated as Pe-Xa pipe) with high temperature resistance, pressure resistance, and corrosion resistance. The outer diameter is 25mm, and the wall thickness is 2.3mm. The heat exchange pipe spacing is preferably 0.3m. The heat exchange pipe inlet and outlet are pre-drilled with a certain length to extend out of the panel, facilitating the connection with the distribution header in the later stage. Rubber plugs are used to block the pipe openings during the transportation of the wall body to prevent impurities and other substances from entering the pipe and blocking the pipe. The rubber plugs are removed after installation. When a capillary tube is used as the heat exchange pipe, the capillary grid is made of polypropylene random (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 pipe is pre-drilled with a horizontal pipe groove, and the capillary grid is installed tightly against the cement fiber board surface with adhesive.

[0073] In the above two examples, the insulation board 233 can effectively block the heat exchange between the energy wall heat exchanger and the station side, preventing the heat carried by the cooling water from being transferred to the station. The insulation board 233 is made of extruded polystyrene foam insulation board (XPS) with a thickness of 80mm. XPS has a low thermal conductivity, good heat insulation performance, pressure resistance and impact resistance, and extremely low water absorption, excellent moisture resistance, corrosion resistance and permeability. The surface of the insulation board 233 is covered with an aluminum foil 234 with an emissivity close to 0, which can reduce the radiation heat transfer between the assembled energy wall and the other walls of the cavity. The use of smooth aluminum-tin film can reduce the convective heat transfer coefficient on the inner surface of the insulation layer, thereby reducing the convective heat transfer.

[0074] The assembled energy wall is fixed by screws or round nails between each layer. When fixing, the nail position should be paid attention to, and the pipeline position in the panel or on the surface should be avoided to prevent the water pipe from being broken.

[0075] The thickness of the whole assembled energy wall 23 is 130-135mm, and the size is 2.4*1.2m and 1.2*1.2m. The installation mode is to directly fix the assembled energy wall on the structure wall by screws, and the pipeline position in the wall surface should be avoided. The bottom is close to the inside of the structure wall, and the side of the thermal insulation layer with the aluminum tin foil film exposed in the cavity.

[0076] The assembled energy wall 23 is a rectangular unit module, which can be standardized produced in the factory. According to the actual needs, various models can be designed according to the area and thickness. A plurality of unit modules are arrayed and spliced to form a large-area wall body, and the internal pipelines of the plurality of unit modules are connected with each other. During construction, only the unit modules need to be spliced and the pipelines need to be connected, so that the wall body can be quickly constructed. The buried pipeline arrangement form is not limited, and the construction period can be shortened, the loss and waste of building materials can be reduced, the installation is convenient, the use is convenient, and the defects in the prior art can be solved. Specifically, the internal pipeline of each unit module is connected to the water supply and return main pipeline by using a plug-in pipe fitting.

[0077] The heat storage container 4 is located in the equipment room on both sides of the station hall, and specifically refers to a heat storage water tank. The heat storage water tank is made of stainless steel and is provided with thermal insulation material. The heat storage water tank temporarily stores excess heat, and when the heat transfer time of the inner area and the heat supply of the surrounding area are not balanced, the heat storage water tank is arranged on the water loop to temporarily store heat, so that the heat is transferred in time.

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

[0079] The air conditioning system of the application further comprises a water treatment device 5, a make-up water tank 6 and a make-up water pump 7, which are sequentially connected and connected to the pipeline between the assembled energy wall system 2 and the heat pump unit 1, and the connection point is located before the water loop circulating water pump 3.

[0080] In addition, the air conditioning system of the present application further comprises a constant pressure device 8 connected to the pipeline between the assembled energy wall system 2 and the heat pump unit 1 and located at the inlet of the circulating water pump 3. The constant pressure device 8 is specifically an expansion tank or an air pressure tank. When the expansion tank is used, the water tank is located at the highest position of the system. When the expansion tank is inconvenient to install, an air pressure tank can be used. The constant pressure device 8 stabilizes the system pressure within a certain range to prevent water emptying or water vaporization. When the water loss caused by blowdown and system leakage and other reasons causes the system pressure to decrease, the system needs to be replenished with water. When the expansion tank is used for pressure stabilization, the system is directly replenished with water through the expansion tank. When the air pressure tank is used for pressure stabilization, the system is automatically replenished with water from the water supply tank 6 through the water supply pump 7 to ensure the stability of the system pressure.

[0081] The system fully utilizes the cavity between the structural wall and the off-wall of the underground station, installs the assembled energy wall system in the cavity, and constitutes the energy wall heat exchanger of the subway station as the heat rejection and heating equipment of the water ring heat pump air conditioning system of the subway station, which can be used for newly-built subway stations and can conveniently reform the energy system of existing underground stations. The technology does not need to drill wells and holes, reduces the cost, and can reasonably utilize the underground space. The system takes the geothermal energy as the external energy of the water ring heat pump air conditioning system, uses the energy wall system to replace the cooling tower or the boiler in the traditional water ring heat pump air conditioning system, can achieve good energy-saving effect, fully utilizes renewable energy, realizes environmental friendliness, and promotes the realization of the "double carbon target" in the underground building field. In addition, the technology greatly reduces the construction difficulty of the traditional energy wall, avoids wet work, is convenient to install, has a short operation period, saves resources, and has remarkable environmental protection benefits.

[0082] The core component of the system of the present application is the assembled energy wall system 2, and the operation principle is as shown in Figure 2 In summer, when the assembled energy wall system 2 starts to operate, the assembled energy wall system 2 is equivalent to a cooling tower, and the condensation heat absorbed in the water ring is released to the soil through the embedded pipe of the energy wall; in winter, when the residual heat in the inner zone is insufficient to meet the heating of the surrounding zone or all zones need to be heated, the assembled energy wall system 2 starts to operate, and the assembled energy wall system 2 is equivalent to a heater to absorb heat from the soil to heat the water in the water ring.

[0083] The present application utilizes the space of the cavity between the assembled energy wall and the off-wall wall, sets a ventilation opening in the upper part and the lower part respectively, utilizes the chimney effect to form the heat pressure natural ventilation. In summer, the upper and lower ventilation openings are opened, the upper ventilation opening is the exhaust opening, and the lower ventilation opening is equivalent to the air supplement opening. When the energy wall operates, the air in the cavity is heated, the hot air rises to form the air flow from bottom to top, the air heated by the energy wall in the cavity is discharged, the temperature in the cavity is naturally cooled and reduced, and the influence on the indoor thermal environment is reduced; in winter, the upper and lower ventilation openings are closed, the air flow speed in the cavity is reduced, the air temperature is increased, and the heat preservation and heat insulation performance of the cavity is enhanced.

[0084] Specifically, the system has the following operation modes:

[0085] Mode 1: In the transition season, the heat supply demand of the surrounding area is less than the residual heat of the inner area

[0086] The operation process is as follows:

[0087] When the residual heat of the inner area is large and the heat supply demand of the surrounding area is small, the temperature of the water loop 9 is increased and is higher than 35 DEG 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] The valves 1 and 3 on the pipeline of the assembled energy wall system 2 are closed, and the operation of the assembled energy wall system 2 is stopped.

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

[0092] When the residual heat of the inner area is insufficient to supply heat to the surrounding area, that is, the temperature of the water loop 9 is lower than 15 DEG C, the heat storage container 4 releases the stored heat to the water loop 9, so that the temperature of the water loop 9 is increased to supply heat to the surrounding area.

[0093] Mode 2: In winter, the inner area has residual heat, and the heat supply demand of the surrounding area is equal to the residual heat of the inner area

[0094] The operation process is as follows:

[0095] In early winter, when the surrounding area does not need much heat supply and the residual heat of the inner area can meet the heat supply of the surrounding area, the temperature of the water loop 9 is stabilized at 15-35 DEG C.

[0096] At this time, if Figure 6 :

[0097] The valves 4 and 5 on the pipeline of the heat storage container 4 are closed, and the heat storage container 4 stops operating;

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

[0099] The valve 2 is opened, the water loop 9 is unblocked, and the residual heat in the inner zone enters the water loop through the heat pump unit 1 to provide heat for the surrounding zone.

[0100] Because the residual heat in the inner zone can exactly meet the heat supply demand of the surrounding zone, no auxiliary cooling tower or heating equipment is needed to discharge heat or heat

[0101] Mode 3: In winter, the inner zone has residual heat, and the heat supply demand of the surrounding zone is greater than the residual heat of the inner zone

[0102] When the heat supply demand of the surrounding zone is large in winter, the valves 4, 5 on the pipeline of the heat storage container 4 are closed, and the heat storage container 4 does not run;

[0103] The residual heat in the inner zone enters the water loop through the heat pump unit to provide heat for the surrounding zone, but the residual heat of the inner zone is less than the heat supply of the surrounding zone, resulting in a decrease in the temperature in the water circulation loop, and the temperature is lower than 15℃ after a period of operation.

[0104] At this time, if Figure 7 :

[0105] The valves 1, 3 on the pipeline of the assembled energy wall system 2 are opened, and the assembled energy wall system 2 starts running;

[0106] The valve 2 is closed, the assembled energy wall system 2 exchanges heat with the surrounding soil, absorbs the heat in the soil, and discharges the heat to the water loop 9, so that the temperature of the water loop 9 is increased and maintained above 15℃, and the heat supply for the surrounding zone is continued.

[0107] Mode 4: In winter, the inner zone has no residual heat, and the inner zone and the surrounding zone both need heat supply

[0108] The heat pump unit 1 is in heating condition, and the temperature of the water loop 9 is decreased and lower than 15℃.

[0109] At this time, if Figure 8 :

[0110] The valves 4, 5 on the pipeline of the heat storage container 4 are closed, and the heat storage container 4 does not run;

[0111] The valves 1, 3 on the pipeline of the assembled energy wall system 2 are opened, and the assembled energy wall system 2 starts running;

[0112] The valve 2 is closed, the assembled energy wall system 2 exchanges heat with the surrounding soil, absorbs the heat in the soil, and increases the temperature of the water loop 9 to above 15℃, to provide heat for the inner zone and the surrounding zone.

[0113] Mode 5: In summer, the inner zone and the surrounding zone both need cooling

[0114] All heat pump units 1 are in refrigeration mode, all units discharge condensing heat into water loop 9, the temperature of water loop rises, and the temperature is higher than 35℃.

[0115] At this time, as Figure 9 :

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

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

[0118] Close valve 2, and assembled energy wall system 2 exchanges heat with the surrounding soil, discharges the heat carried by the water loop to the surrounding soil to reduce the temperature of the water loop, and maintains the temperature below 35℃ to supply cooling for the inner area and the surrounding area.

[0119] In the operation of the system, when the flow of the circulating water system is small, a constant flow operation mode can be used; when the flow of the system is large, a variable flow operation mode is preferably used. When the variable flow operation mode is used, a switch-type electric valve connected with the start-stop interlocking control of the unit should be arranged on the circulating water pipeline of the unit.

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

[0121] (1) The assembled energy wall of the present application, as an underground heat exchanger, is located in the cavity between the underground station structure wall and the separation wall, and is combined with the underground enclosure structure, so that no additional underground space is occupied, land resources are saved, the disadvantage of large land occupation of the traditional vertical borehole ground heat exchanger is overcome, and efficient use of underground space is promoted.

[0122] (2) The assembled energy wall of the present application can transfer waste heat to the surrounding soil, and is used as an auxiliary heat rejection device of the water loop heat pump, replacing the cooling tower in the traditional water loop heat pump air conditioning system. The assembled energy wall of the present application can also extract geothermal energy from the soil for heating, and is used as an auxiliary heating device of the water loop heat pump, replacing the high-level energy heating device such as electric boiler and gas boiler used in the traditional water loop heat pump. Compared with the traditional auxiliary cold and heat source device, renewable energy is fully utilized as the external supplementary energy of the water loop heat pump air conditioning system, and the energy saving and carbon reduction effect is remarkable.

[0123] (3) The assembled energy wall of the present application is simple to manufacture, can be directly installed on the inner surface of the structure wall, is convenient to install, and does not affect the mechanical properties of the structure wall, while greatly reducing the construction difficulty of the traditional energy wall, shortening the construction period, and facilitating the modification of the energy system of the existing subway station.

[0124] The above application of specific examples to illustrate the present invention, is only used to help understand the present invention, and does not limit the present invention. For the skilled in the art to which the present invention belongs, according to the idea of the present invention, several simple deductions, deformation or replacement can be made.

Claims

1. A kind of underground station energy wall water loop heat pump air conditioning system, it is characterized in that: The air conditioning system includes heat pump unit (1), fabricated energy wall system (2) and heat storage container (4), and the heat pump unit (1) is water-air heat pump unit; The heat pump unit (1) is located in the equipment room, station hall layer, platform layer needing cooling or heating, the fabricated energy wall system (2) is located in the cavity between the structural wall (22) and the off-wall wall (25) of underground station, and the heat storage container (4) is located in the equipment room on both sides of station hall layer; The heat pump unit (1), the fabricated energy wall system (2) and the heat storage container (4) are connected on water loop (9). 2.A kind of underground station energy wall water loop heat pump air conditioning system according to claim 1, it is characterized in that: The air conditioning system further includes water treatment device (5) and make-up water tank (6), and is sequentially connected and accessed on water loop (9) between the fabricated energy wall system (2) and the heat pump unit (1). 3.A kind of underground station energy wall water loop heat pump air conditioning system according to claim 2, it is characterized in that: The air conditioning system further includes constant pressure device (8), and is accessed on water loop (9) between the fabricated energy wall system (2) and the heat pump unit (1). 4.A kind of underground station energy wall water loop heat pump air conditioning system according to claim 1, it is characterized in that: The fabricated energy wall system (2) includes fabricated energy wall (23), and the fabricated energy wall (23) is located between the structural wall (22) and the off-wall wall (25) of underground station, and is close to soil side (21), and is close to structural wall (22); Air layer (24) is left between the fabricated energy wall (23) and the off-wall wall (25), the top of air layer (24) is provided with vent, and is open to ground. 5.A kind of underground station energy wall water loop heat pump air conditioning system according to claim 4, it is characterized in that: The fabricated energy wall (23) includes pipe-buried layer (232), the near soil side of pipe-buried layer (232) is heat equalizing plate (231), the near air side of pipe-buried layer (232) is heat insulation board (233), and the outer side of heat insulation board (233) is pasted with aluminum foil (234). 6.A kind of underground station energy wall water loop heat pump air conditioning system operating method according to any one of claims 1-5, it is characterized in that: The method is implemented when the heat supply of peripheral area is less than the residual heat of inner area, including: opening the valve on the pipe of heat storage container (4), and heat storage container (4) starts to operate; closing the valve on the pipe of fabricated energy wall system (2), and fabricated energy wall system (2) stops operating; the residual heat of inner area enters water loop (9) through heat pump unit (1), and after supplying heat to peripheral area, the remaining heat is stored in heat storage container (4); when the residual heat of inner area is insufficient to supply heat to peripheral area, heat storage container (4) releases the stored heat to water loop (9), so that the temperature of water loop (9) is increased to supply heat to peripheral area.

7. The operation method of the water loop heat pump air conditioning system of the energy wall in the underground station according to any one of claims 1-5, wherein: the method is implemented when the heat supply of the peripheral area is equal to the residual heat of the inner area, and comprises: closing the valve on the pipeline of the heat storage container (4), and stopping the operation of the heat storage container (4); closing the valve on the pipeline of the assembled energy wall system (2), and stopping the operation of the assembled energy wall system (2); and opening the water loop (9), and making the residual heat of the inner area enter the water loop (9) through the heat pump unit (1) to supply heat for the peripheral area.

8. The operation method of the water loop heat pump air conditioning system of the energy wall in the underground station according to any one of claims 1-5, wherein: the method is implemented when the heat supply of the peripheral area is greater than the residual heat of the inner area, and comprises: making the residual heat of the inner area enter the water loop (9) through the heat pump unit (1) to supply heat for the peripheral area, and reducing the temperature of the water loop (9); closing the valve on the pipeline of the heat storage container (4), and stopping the operation of the heat storage container (4); opening the valve on the pipeline of the assembled energy wall system (2), and starting the operation of the assembled energy wall system (2); and making the assembled energy wall system (2) exchange heat with the surrounding soil to absorb the heat in the soil and increase the temperature of the water loop (9) to supply heat for the peripheral area.

9. The operation method of the water loop heat pump air conditioning system of the energy wall in the underground station according to any one of claims 1-5, wherein: the method is implemented when there is no residual heat in the inner area and the inner area and the peripheral area both need to be supplied with heat, and comprises: making the heat pump unit (1) be in the heating condition, and reducing the temperature of the water loop (9); closing the valve on the pipeline of the heat storage container (4), and stopping the operation of the heat storage container (4); opening the valve on the pipeline of the assembled energy wall system (2), and starting the operation of the assembled energy wall system (2); and making the assembled energy wall system (2) exchange heat with the surrounding soil to absorb the heat in the soil and increase the temperature of the water loop (9) to supply heat for the peripheral area.

10. The operation method of the water loop heat pump air conditioning system of the energy wall in the underground station according to any one of claims 1-5, wherein: the method is implemented when the inner area and the peripheral area both need to be supplied with cooling, and comprises: making the heat pump unit (1) be in the cooling condition, and increasing the temperature of the water loop (9); closing the valve on the pipeline of the heat storage container (4), and stopping the operation of the heat storage container (4); opening the valve on the pipeline of the assembled energy wall system (2), and starting the operation of the assembled energy wall system (2); and making the assembled energy wall system (2) exchange heat with the surrounding soil to discharge the heat to the surrounding soil and reduce the temperature of the water loop (9) to supply cooling for the peripheral area. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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