Green building heating and ventilation system based on geothermal recovery

Abstract

The application discloses a kind of green building heating ventilation systems based on geothermal recovery, belong to building energy conservation and renewable energy utilization technical field.The technical scheme for the application is a kind of green building heating ventilation systems based on geothermal recovery, including the heat exchange area in building, the geothermal recovery area in underground constant temperature layer, first heat exchange component is equipped between the heat exchange area and geothermal recovery area to extract the cold or heat of geothermal recovery area and transfer to building inside;Heat storage mechanism is buried in underground constant temperature layer, second heat exchange component is equipped in the heat storage mechanism, and the second heat exchange component is parallel with first heat exchange component;The application is parallelly designed by geothermal recovery area and heat storage mechanism, and realizes heat energy dynamic allocation in combination with multiple temperature sensors and control system, solves the problem of underground temperature field imbalance and multiple energy system fragmentation, has the advantages of improving energy utilization efficiency, realizing cross-season heat storage, guaranteeing system operation stability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building energy saving and renewable energy utilization, and particularly relates to a green building heating and ventilation system based on geothermal recovery. BACKGROUND

[0002] Traditional building heating and ventilation systems rely on fossil energy for driving, and have problems such as high energy consumption and large carbon emissions. In recent years, renewable energy technologies represented by ground source heat pumps and solar heat collection have been gradually applied in the field of buildings, but there are still the following technical bottlenecks:

[0003] In the aspect of geothermal utilization, although the traditional ground source heat pump system can utilize the underground constant temperature layer for heat exchange, its heat exchange efficiency is severely restricted by geological conditions, pipe material thermal conductivity and burial depth. The conventional buried pipe structure design is single, and lacks dynamic adjustment capability for heat exchange area, resulting in difficulty in improving heat exchange efficiency. More seriously, long-term one-way heat extraction or heat rejection will cause imbalance of underground temperature field, and further affect the stability and sustainability of system operation.

[0004] Solar energy utilization systems face greater technical challenges. Due to the significant intermittent and seasonal characteristics of solar radiation, it is difficult to meet the continuous and stable heating demand of buildings solely relying on solar energy. The existing systems generally lack efficient heat storage means, resulting in that the collected solar energy cannot be effectively stored and reasonably allocated, causing serious waste of energy.

[0005] In the aspect of multi-energy collaboration, the existing technology has obvious system fragmentation problem. The geothermal system and the solar system are often designed and operated independently, and lack effective heat energy complementary mechanism. The waste heat generated inside the building, such as equipment heat dissipation and ventilation exhaust heat, also cannot be organically integrated with the geothermal and solar systems, resulting in low energy utilization rate.

[0006] The deficiency of system control capability is also a key factor restricting the development of technology. The traditional system mostly adopts fixed operation mode, and cannot be adjusted in real time according to the change of environmental temperature, building load demand and the state of heat storage device. This rigid operation mode not only causes energy mismatch, but also leads to insufficient adaptability of the system under complex working conditions.

[0007] In the field of heat storage technology, the existing devices generally adopt single medium heat storage mode, and have technical defects such as low heat storage density and large heat loss. More importantly, the heat storage system and the function modules such as building domestic hot water supply lack deep integration design, and it is difficult to realize the cascade utilization of energy. The connection design between the buried pipe and the heat storage mechanism is also relatively extensive, and it is impossible to realize the cross-seasonal storage and intelligent allocation of heat energy. SUMMARY

[0008] This invention provides a green building heating and ventilation system based on geothermal recovery to solve at least one of the above-mentioned technical problems.

[0009] The technical solution adopted in this invention is as follows:

[0010] A green building heating and ventilation system based on geothermal recovery includes a heat exchange zone located within the building and a geothermal recovery zone located in an underground constant temperature layer. A first heat exchange component is provided between the heat exchange zone and the geothermal recovery zone to extract the cold or heat energy from the geothermal recovery zone and transfer it to the building. A heat storage mechanism is buried in the underground constant temperature layer, and a second heat exchange component is provided within the heat storage mechanism. The second heat exchange component is connected in parallel with the first heat exchange component to recover heat from the building. It also includes a solar heat recovery zone, and a third heat exchange component is provided within the heat storage mechanism for recovering heat from the solar heat recovery zone. The system also includes a control system, an ambient temperature sensor, a first temperature sensor located in the geothermal recovery zone, a second temperature sensor located in the heat exchange zone within the building, and a third temperature sensor located in the heat storage mechanism. The control system controls the flow direction of the heat exchange medium in the first, second, and third heat exchange components based on the monitored temperatures of the ambient temperature sensor, the first temperature sensor, the second temperature sensor, and the third temperature sensor to achieve heating or cooling of the building environment.

[0011] Furthermore, this application also proposes that a water tank for domestic water supply is provided in the building, a fourth heat exchange component is provided between the heat storage mechanism and the water tank, a fourth temperature sensor is provided in the water tank, and the control system controls the flow direction of the heat exchange medium in the first heat exchange component, the second heat exchange component, the third heat exchange component and the fourth heat exchange component according to the monitoring value of the fourth temperature sensor.

[0012] Furthermore, this application also proposes that the geothermal recovery zone includes several buried pipe assemblies spaced apart, the buried pipe assemblies being embedded in an underground constant temperature layer, the first heat exchange assembly having a first heat exchange section located within the buried pipe assembly and a second heat exchange section located in the heat exchange zone, the buried pipe assembly including a heat-conducting pipe and an insulation pipe sequentially from bottom to top, the heat-conducting pipe and the insulation pipe being connected by a connecting pipe, the connecting pipe having a baffle in the middle to divide the inner cavity of the connecting pipe into a first channel and a second channel, the first heat exchange section including a spiral heat exchange pipe located within the heat-conducting pipe, the top of the heat-conducting pipe having a first heat exchange section. A sealing plate is provided at the bottom of the insulation pipe, and a second sealing plate is provided at both ends of the spiral heat exchange tube, which are connected to the first and second channels of the connecting pipe respectively through the first sealing plate. The insulation pipe is provided with an inlet pipe and an outlet pipe. The lower ends of the inlet pipe and the outlet pipe are connected to the first and second channels of the connecting pipe respectively through the second sealing plate. The second heat exchange section includes a heat exchange medium inlet channel and a heat exchange medium outlet channel. The upper ends of several inlet pipes are connected in parallel to the heat exchange medium inlet channel of the heat exchange zone, and the upper ends of several outlet pipes are connected in parallel to the heat exchange medium outlet channel of the heat exchange zone.

[0013] Further, the application also proposes that the heat storage mechanism comprises a heat storage tank, which is buried 2-5 meters below the ground; the second heat exchange assembly comprises a first heat exchange pipe located in the heat storage mechanism, and both ends of the first heat exchange pipe are connected in parallel with the medium discharge channel of the heat exchange area through a three-way valve.

[0014] Further, the application also proposes that a first circulating pump is arranged on the heat exchange medium inlet channel or the heat exchange medium discharge channel, a second circulating pump is arranged on the second heat exchange assembly, and a third circulating pump is arranged on the third heat exchange pipe; the control system controls the flow direction of the heat exchange medium in the first heat exchange assembly, the second heat exchange assembly, the third heat exchange assembly, and the fourth heat exchange assembly to have the following modes: mode one, the monitoring value of the ambient temperature sensor is greater than or equal to 26℃, the monitoring value of the second temperature sensor is greater than the detection value of the third temperature sensor, the heat exchange medium flowing through the geothermal recovery area is circulated to the heat exchange area in the building along the first heat exchange pipe, the medium inlet channel, and the first circulating pump, the control system controls the valve core of the three-way valve to rotate so that the heat exchange medium after absorbing heat flows through the heat storage tank and then returns to the first heat exchange pipe; mode two, the monitoring value of the ambient temperature sensor is greater than or equal to 26℃, the monitoring value of the second temperature sensor is less than or equal to the detection value of the third temperature sensor, the heat exchange medium flowing through the geothermal recovery area is circulated to the heat exchange area in the building along the first heat exchange pipe, the medium inlet channel, and the first circulating pump, the control system controls the valve core of the three-way valve to rotate so that the heat exchange medium after absorbing heat directly returns to the first heat exchange pipe; mode three, 15℃< the monitoring value of the ambient temperature sensor < 26℃, the building relies on the natural ventilation system to adjust the indoor temperature; mode four, the monitoring value of the ambient temperature sensor is less than or equal to 15℃, the monitoring value of the first temperature sensor is greater than the monitoring value of the third temperature sensor, the heat exchange medium flowing through the geothermal recovery area is circulated to the heat exchange area in the building along the first heat exchange pipe and the medium discharge channel, and then the heat exchange medium after heat release is returned to the first heat exchange pipe in the geothermal recovery area through the first circulating pump; mode five, the monitoring value of the ambient temperature sensor is less than or equal to 15℃, the monitoring value of the first temperature sensor is less than the monitoring value of the third temperature sensor, the control system controls the three-way valve to rotate so that the heat exchange medium flowing through the geothermal recovery area enters the third heat exchange assembly along the first heat exchange pipe and the medium discharge channel to further increase the heat of the heat exchange medium, and then the heat exchange medium after heat release is returned to the first heat exchange pipe in the geothermal recovery area through the first circulating pump. The control system controls the second circulating pump to make the heat storage tank recover the heat of the solar heat recovery area; and the control system controls the third circulating pump to make the heat recovered in the heat storage tank pass through the fourth heat exchange assembly to heat the domestic water in the water tank.

[0015] Further, the application also proposes that the solar heat recovery area comprises a plurality of solar panels arranged on the roof and / or the outer wall and / or the open ground of the building, and the third heat exchange assembly comprises a second heat exchange pipe, which has a heat absorption area located on the surface of the solar panel and a heat release area located in the heat storage tank.

[0016] Further, the fourth heat exchange assembly includes a third heat exchange pipe, and the third heat exchange pipe has a heat absorption part in the heat storage tank and a heat release part in the heat release part of the water tank.

[0017] Further, the fourth heat exchange assembly includes a third heat exchange pipe, and the third heat exchange pipe has a heat absorption part in the heat storage tank and a heat release part in the heat release part of the water tank.

[0018] Further, the fourth heat exchange assembly includes a third heat exchange pipe, and the third heat exchange pipe has a heat absorption part in the heat storage tank and a heat release part in the heat release part of the water tank.

[0019] Further, the fourth heat exchange assembly includes a third heat exchange pipe, and the third heat exchange pipe has a heat absorption part in the heat storage tank and a heat release part in the heat release part of the water tank.

[0020] Due to the adoption of the above technical scheme, the application has the following beneficial effects:

[0021] 1. When the temperature of the underground constant temperature layer is higher than the building demand, the first heat exchange assembly transmits the geothermal heat to the heat exchange area to realize heating, and the second heat exchange assembly stores the building waste heat to the heat storage mechanism. When the solar heat collection temperature is higher than the heat storage mechanism, the third heat exchange assembly guides the solar heat into the heat storage mechanism. The control system compares the ambient temperature, the building temperature, the geothermal temperature and the heat storage temperature, and automatically switches the operation mode: in the high temperature season, the geothermal cold energy is preferentially called to reduce the temperature, and the building waste heat is stored; in the low temperature season, the heat storage heat is preferentially called to heat, and the solar auxiliary heating is started when the geothermal heat is insufficient. The heat storage mechanism serves as a buffer unit, balances the solar fluctuation in the day and night alternation, and adjusts the geothermal load in the seasonal conversion.

[0022] By the technical scheme, the application realizes multi-source collaborative utilization of geothermal energy, solar energy and building waste heat, and effectively improves renewable energy utilization rate. The dynamic regulation mechanism adapts to temperature fluctuations in different seasons, and ensures stable indoor environment. The underground heat storage mechanism relieves the cold and heat accumulation problem of the geothermal system, and provides long-term storage space for solar energy. The multi-circuit heat exchange design enables the system to simultaneously perform multiple functions such as heat supply, heat storage, and domestic hot water preparation.

[0023] When the fourth temperature sensor detects that the water temperature in the water tank is lower than the preset value, the control system will adjust the operating state of each heat exchange component. For example, in the case that there is excess heat stored in the heat storage mechanism, the fourth heat exchange component is activated, and the heat exchange medium in the heat storage mechanism flows through the third heat exchange pipe and exchanges heat with the water in the water tank. At the same time, the system can dynamically adjust the heat exchange priority of the first, second and third heat exchange components to prioritize the temperature requirement of domestic hot water. When the water temperature in the water tank reaches the set threshold, the heat exchange flow of the fourth heat exchange component can be automatically reduced or closed to avoid energy waste.

[0024] The buried pipe assembly adopts a split structure design, the lower heat conduction pipe is completely buried in the constant temperature stratum, and the upper heat preservation pipe extends to the near surface area. The heat exchange medium enters the first channel of the communication pipe through the liquid inlet pipe, absorbs the stratum heat through the spiral heat exchange pipe, and then enters the second channel of the liquid outlet pipe to return to the ground. In this process, the efficient heat conduction characteristics of the heat conduction pipe accelerate the energy exchange between the heat exchange medium and the stratum, and the heat preservation pipe effectively blocks the influence of the surface temperature fluctuation on the pipeline. The corrugated structure of the spiral heat exchange pipe can adjust the expansion length through the electric telescopic rod according to the temperature monitoring data, so as to dynamically change the heat exchange area. The parallel design of multiple buried pipe assemblies enables the system to flexibly adjust the number of working units according to the building load demand, avoiding the imbalance of the stratum temperature caused by the long-term operation of a single pipeline.

[0025] The heat storage tank forms a heat balance with the underground constant temperature layer through the buried depth, and the first heat exchange pipe of the second heat exchange component is connected to the heat exchange zone medium discharge channel in a parallel manner, forming a heat recovery path independent of the geothermal recovery zone. When the heat in the building needs to be stored, the heat exchange medium enters the first heat exchange pipe in the heat storage tank through the three-way valve switching, and transfers the heat to the heat storage material; when the heat needs to be called, the medium flows in the opposite direction, and the heat in the heat storage tank is transported to the heat exchange zone through the first heat exchange pipe. The parallel design of the three-way valve forms a complementary circuit between the heat storage mechanism and the geothermal recovery zone, which can dynamically adjust the heat storage or release mode according to the temperature sensor signal.

[0026] In mode one, when the ambient temperature is higher than 26℃ and the indoor temperature exceeds the heat storage tank temperature, the cold energy absorbed by the geothermal recovery area is transported to the indoor heat exchange area through the first heat exchange pipe, while the three-way valve guides the heat exchange medium to flow through the heat storage tank for waste heat storage. In mode two, when the indoor temperature is lower than the heat storage tank temperature, the heat exchange medium directly returns to maintain system efficiency. In mode three, when the ambient temperature is between 15-26℃, the system stops active temperature control to reduce energy consumption. In mode four, when the ambient temperature is lower than 15℃ and the geothermal recovery area temperature is higher than the heat storage tank, the system directly extracts geothermal heat for heating. In mode five, when the geothermal temperature is insufficient, the system supplements solar heat through the third heat exchange component. Solar heat recovery and domestic water heating are independently controlled by the second circulating pump and the third circulating pump, respectively, and the heat storage and calling of the heat storage tank are realized by switching through the three-way valve.

[0027] The solar panels form a three-dimensional layout on the roof, outer wall and ground, which can maximize the reception of solar radiation according to seasonal changes and differences in solar angles. The heat absorption area closely adheres to the light-receiving surface of the solar panel, and absorbs the heat collected on the surface of the panel through the internally flowing heat exchange medium. The heated heat exchange medium is transported along the second heat exchange pipe to the heat storage tank, and exchanges heat with the heat storage material through the heat release area to realize the storage of solar heat. The structure can be reversely operated in rainy days or at night to call the heat accumulated in the heat storage tank to maintain system operation.

[0028] When the heat stored in the heat storage tank reaches the preset threshold, the control system starts the third circulating pump to drive the heat exchange medium to circulate in the third heat exchange pipe. The heat exchange medium absorbs the stored heat when flowing through the heat absorption part in the heat storage tank, and then enters the heat release part in the water tank to release heat to the domestic water. The temperature sensor monitors the water temperature in real time, and when the water temperature is lower than the set range, the system preferentially calls the heat of the heat storage tank for supplementary heating; when the heat of the heat storage tank is insufficient, other heat exchange components can be linked to work together. This process realizes the directional transmission of heat energy between the heat storage tank and the water tank through medium flow direction control, forming a closed loop heat recovery link.

[0029] When the ambient temperature sensor detects a sudden drop in external temperature, the control system obtains the actual temperature of the indoor heat exchange area through the second temperature sensor. If the temperature difference between the two exceeds the set threshold, the electric telescopic rod will push the traction plate to move downward along the heat guide pipe, driving the spiral heat exchange pipe to expand to increase its contact area with the heat guide pipe. At this time, the bellows structure can adapt to the length change to avoid stress damage due to deformation. Conversely, when the temperature difference is small, the electric telescopic rod is retracted to shorten the effective length of the spiral heat exchange pipe, reducing unnecessary heat exchange loss. This dynamic adjustment process optimizes the heat exchange efficiency in real time through a closed loop control system. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The structure of the specific embodiment of the present application is shown in the structural schematic diagram.

[0031] Figure 2 For the invention Figure 1 Enlarged view of part A in the invention

[0032] Figure 3 For the invention Figure 1 Enlarged view of part B in the invention

[0033] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0034] In the drawings:

[0035] 1, heat pipe; 11, first sealing plate; 12, spiral heat exchange pipe; 13, traction plate; 131, U-shaped bolt sleeve; 14, electric telescopic rod; 2, communication pipe; 21, partition plate; 3, heat preservation pipe; 31, liquid inlet pipe; 32, liquid outlet pipe; 4, first circulating pump; 41, heat exchange medium inlet passage; 42, heat exchange medium outlet passage; 5, three-way valve; 6, heat storage tank; 61, first heat exchange pipe; 62, second heat exchange pipe; 63, third heat exchange pipe; 7, building; 8, water tank; 81, second circulating pump; 9, third circulating pump. DETAILED DESCRIPTION

[0036] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail with reference to the accompanying drawings.

[0037] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details and other implementations can be employed. Therefore, the scope of the present application is defined by the appended claims, not by the following detailed description.

[0038] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 limiting the present application.

[0039] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection", "fixed", and the like are to be broadly understood, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, and can also be communication; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. 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.

[0040] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. In the description of the specification, the description of the terms "embodiment", "example", "one embodiment", "exemplary" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] Those skilled in the art can understand that the conventional building heating and ventilation system relies on fossil energy driving, and has problems of high energy consumption and large carbon emissions. The ground source heat pump system is limited by geological conditions and pipe thermal conductivity, and long-term operation can easily lead to imbalance of underground cold and heat accumulation. The solar energy system is significantly affected by day and night and seasonal fluctuations, and the excess heat lacks effective storage means. The existing system is operated by a single heat source, and the waste heat inside the building is not effectively recovered, and multiple energy sources cannot be complemented. The heat storage device has low heat storage density and is not integrated with the domestic hot water supply module. In extreme temperature areas, the traditional system is difficult to dynamically adjust the building temperature, and the extraction efficiency of geothermal heat decreases in winter, leading to insufficient indoor heating, and solar energy is excessive in summer, causing energy waste.

[0042] In order to solve the above problems, considering that the single geothermal system has the risk of cold and heat accumulation, and the solar energy system has the problem of intermittency, how to realize the cooperation of multiple heat sources becomes the key. It is further found that there is recyclable waste heat inside the building, but the existing technology lacks a recycling mechanism. By setting a heat storage mechanism in parallel with the geothermal system, building waste heat and solar waste heat can be stored. In view of the dynamic regulation and control demand, multiple temperature sensors are introduced to monitor the temperature of each area in real time, and an adaptive control logic based on environmental parameters is constructed.

[0043] Reference Figures 1-3The application provides a heat exchange area in a building 7, a geothermal recovery area in a constant temperature layer of the ground, a first heat exchange assembly between the heat exchange area and the geothermal recovery area to extract cold or heat from the geothermal recovery area and transfer the cold or heat to the building 7, a heat storage mechanism buried in the constant temperature layer of the ground, a second heat exchange assembly in the heat storage mechanism, the second heat exchange assembly being connected in parallel with the first heat exchange assembly, a solar heat recovery area, and a third heat exchange assembly in the heat storage mechanism. A control system controls the flow direction of a heat exchange medium according to the monitoring temperatures of an environment temperature sensor, a first temperature sensor, a second temperature sensor and a third temperature sensor.

[0044] The heat exchange area is a functional area for heat exchange in the building 7, which can be implemented by a plate heat exchanger or a finned tube heat exchanger, and is used for transferring geothermal energy or recovering waste heat of the building 7. The geothermal recovery area is a heat energy collection area buried in the constant temperature layer of the ground, which can be implemented by a vertical buried pipe or a horizontal buried pipe system, and is used for heat exchange by using the constant temperature characteristics of the underground soil. The first heat exchange assembly is a heat energy transmission device connecting the building 7 and the ground, which can be implemented by a closed loop circulation pipeline matched with an anti-freezing liquid medium, and is used for bidirectional transmission of cold or heat. The heat storage mechanism is an underground energy storage device for storing excess heat, which can be implemented by a sealed container filled with a phase change material, and is used for cross-season heat storage. The second heat exchange assembly is a heat exchange device connecting the building 7 and the heat storage mechanism, which can be implemented by a serpentine coil structure, and is used for guiding waste heat of the building 7 into the heat storage mechanism. The third heat exchange assembly is a heat exchange device connecting a solar system and the heat storage mechanism, which can be implemented by a vacuum heat collector and a heat conducting oil circulation system, and is used for converting solar energy into heat energy for storage. The control system is a regulation and control unit based on multi-source temperature data, which can be implemented by a PLC controller and an electric valve linkage, and is used for dynamically adjusting the working states of various heat exchange circuits.

[0045] Specifically, when the temperature of the constant temperature layer of the ground is higher than the demand of the building 7, the first heat exchange assembly transfers geothermal heat to the heat exchange area to realize heating, and meanwhile, the second heat exchange assembly stores excess heat of the building 7 to the heat storage mechanism. When the solar heat collection temperature is higher than the heat storage mechanism, the third heat exchange assembly guides solar heat into the heat storage mechanism. The control system automatically switches the operation mode by comparing the environment temperature, the temperature of the building 7, the geothermal temperature and the heat storage temperature, that is, in the high temperature season, the geothermal cold is preferentially called to reduce the temperature, and the excess heat of the building 7 is stored, in the low temperature season, the heat storage heat is preferentially called to heat, and the solar auxiliary heating is started when the geothermal heat is insufficient. The heat storage mechanism serves as a buffer unit to balance the solar fluctuation in day and night alternation and to adjust the geothermal load in season conversion.

[0046] Compared with the prior art, the traditional ground source heat pump only realizes one-way heat exchange between the building 7 and the ground, and the present scheme forms a two-way heat exchange network through the parallel heat storage mechanism, which not only avoids the imbalance of cold and heat of the ground, but also recovers the waste heat of the building 7. The direct heating of the existing solar energy system is easy to cause mismatch between supply and demand, and the present scheme realizes time shift of energy through the heat storage mechanism. The traditional system adopts a fixed operation mode, and the present scheme realizes intelligent switching of the heating / cooling mode through linkage of multiple sensors.

[0047] Through the above technical scheme, the present application realizes multi-source collaborative utilization of geothermal energy, solar energy and waste heat of the building 7, and effectively improves the renewable energy utilization rate. The dynamic regulation mechanism adapts to temperature fluctuations in different seasons and ensures stable indoor environment. The underground heat storage mechanism relieves the cold and heat accumulation problem of the geothermal system, and at the same time provides long-term storage space for solar energy. The multi-circuit heat exchange design enables the system to simultaneously perform multiple functions such as heating, heat storage, domestic hot water preparation and the like.

[0048] The present application further proposes that the building 7 is provided with a water tank 8 for domestic water supply, a fourth heat exchange assembly is arranged between the heat storage mechanism and the water tank 8, and a fourth temperature sensor is arranged in the water tank 8. The control system controls the flow direction of the heat exchange medium in the first heat exchange assembly, the second heat exchange assembly, the third heat exchange assembly and the fourth heat exchange assembly according to the monitoring value of the fourth temperature sensor.

[0049] The fourth heat exchange assembly refers to a heat exchange unit connecting the heat storage mechanism and the domestic water tank 8, which can be realized by using a tube-shell heat exchanger or a plate heat exchanger, and its function is to transfer the heat stored in the heat storage mechanism to the water body in the water tank 8, realizing preheating or heating of domestic water. The fourth temperature sensor refers to a device installed inside the water tank 8 for detecting water temperature, which can be realized by using a thermal resistance or a thermocouple sensor, and its function is to feed back the water temperature data to the control system in real time, providing basis for regulation and control of the flow direction of the heat exchange medium.

[0050] Specifically, when the fourth temperature sensor detects that the water temperature in the water tank 8 is lower than the preset value, the control system will adjust the operation state of each heat exchange assembly. For example, in the case that there is surplus heat stored in the heat storage mechanism, the fourth heat exchange assembly is activated, and the heat exchange medium in the heat storage mechanism flows through the third heat exchange pipe 63 and exchanges heat with the water body in the water tank 8. At the same time, the system can dynamically adjust the heat exchange priority of the first, second and third heat exchange assemblies, and preferentially ensure the temperature requirement of domestic hot water. When the water temperature of the water tank 8 reaches the set threshold value, the heat exchange flow of the fourth heat exchange assembly can be automatically reduced or closed, avoiding energy waste.

[0051] Compared with the prior art, the traditional heat storage system is not linked with the domestic hot water supply for control, and the heating of domestic water usually relies on an independent electric heating device or a gas boiler, resulting in energy waste. The scheme establishes a heat exchange link between the heat storage mechanism and the water tank 8 through the fourth heat exchange component, and realizes intelligent control based on the feedback of the fourth temperature sensor, so that the heat storage system can not only meet the heating and ventilation demand of the building 7, but also simultaneously improve the preparation efficiency of domestic hot water.

[0052] Through the above technical scheme, the present application effectively solves the problems of single function of the heat storage system and high energy consumption of domestic hot water preparation in the prior art, and realizes multi-stage utilization of waste heat resources inside the building 7. The heat of the heat storage mechanism can be used not only for environmental temperature regulation, but also for on-demand supply to the domestic hot water system through the fourth heat exchange component, significantly improving the overall energy utilization efficiency.

[0053] The present application further proposes a green building 7 heating and ventilation system based on geothermal recovery, comprising a plurality of buried pipe assemblies arranged at intervals, the buried pipe assemblies being buried in the underground constant temperature layer, the first heat exchange component having a first heat exchange part located in the buried pipe assembly and a second heat exchange part located in the heat exchange area, the buried pipe assembly comprising a heat conducting pipe 1 and a heat preservation pipe 3 from bottom to top in turn, the heat conducting pipe 1 and the heat preservation pipe 3 being connected through a communication pipe 2, the communication pipe 2 being provided with a partition plate 21 in the middle to divide the inner cavity of the communication pipe 2 into a first channel and a second channel, the first heat exchange part comprising a spiral heat exchange pipe 12 located in the heat conducting pipe 1, the top of the heat conducting pipe 1 being provided with a first sealing plate 11, the bottom of the heat preservation pipe 3 being provided with a second sealing plate, both ends of the spiral heat exchange pipe 12 penetrating through the first sealing plate 11 and being connected into the first channel and the second channel of the communication pipe 2 respectively, the heat preservation pipe 3 being provided with an inlet pipe 31 and an outlet pipe 32, the lower ends of the inlet pipe 31 and the outlet pipe 32 penetrating through the second sealing plate and being connected into the first channel and the second channel of the communication pipe 2 respectively, the second heat exchange part comprising a heat exchange medium inlet channel 41 and a heat exchange medium outlet channel 42, the upper ends of the plurality of inlet pipes 31 being connected in parallel to the heat exchange medium inlet channel 41 of the heat exchange area, and the upper ends of the plurality of outlet pipes 32 being connected in parallel to the heat exchange medium outlet channel 42 of the heat exchange area.

[0054] The buried pipe assembly refers to a heat exchange structure unit buried in the ground, which is specifically implemented by a plurality of groups of pipe assemblies distributed at intervals to avoid mutual interference of underground heat exchange regions. The heat conduction pipe 1 refers to a metal pipe section that bears the function of underground heat energy conduction, which can be implemented by using nickel-based high-temperature alloy material. Its role is to accelerate the heat exchange between the underground constant temperature layer and the heat exchange medium through high thermal conductivity. The heat preservation pipe 3 refers to a pipe section with heat insulation performance, which is composed of a vacuum heat insulation inner pipe and a carbon fiber reinforced layer, and is used to reduce the interference of the ground environment temperature on the heat exchange medium. The connecting pipe 2 refers to a transition component connecting the heat conduction pipe 1 and the heat preservation pipe 3, which realizes the shunt control of the heat exchange medium by setting an inner cavity structure with a partition plate 21. The spiral heat exchange pipe 12 refers to a corrugated pipe structure coiled in the heat conduction pipe 1, which is designed to be extendable so that its contact area is adjustable, and is used to enhance the heat exchange efficiency between the heat exchange medium and the stratum. The first sealing plate 11 refers to a closed component arranged at the top end of the heat conduction pipe 1, which realizes the length adjustment function of the spiral heat exchange pipe 12 through a fixed electric telescopic rod 14. The second sealing plate refers to an isolation component installed at the bottom of the heat preservation pipe 3, which is used to fix the connection position of the liquid inlet pipe 31 and the liquid outlet pipe 32.

[0055] Specifically, the buried pipe assembly adopts a split structure design, with the lower heat conduction pipe 1 completely buried in the constant temperature stratum and the upper heat preservation pipe 3 extending to the near ground surface area. The heat exchange medium enters the first passage of the connecting pipe 2 through the liquid inlet pipe 31, absorbs the stratum heat through the spiral heat exchange pipe 12, and then enters the second passage to return to the ground surface through the liquid outlet pipe 32. In this process, the high-efficiency heat conduction characteristics of the heat conduction pipe 1 accelerate the energy exchange between the heat exchange medium and the stratum, and the heat preservation pipe 3 effectively blocks the influence of the ground temperature fluctuation on the pipeline. The corrugated structure of the spiral heat exchange pipe 12 can adjust the unfolded length through the electric telescopic rod 14 according to the temperature monitoring data, so as to dynamically change the heat exchange area. The parallel design of multiple groups of buried pipe assemblies makes the system flexible to adjust the number of working units according to the load demand of the building 7, avoiding the imbalance of the stratum temperature caused by the long-term operation of a single pipeline.

[0056] Compared with the prior art, the traditional buried pipe adopts a single pipe linear structure, the heat exchange path is short and the contact area is fixed, which is easy to form local cold and hot accumulation. The medium flow path is lengthened by 3-5 times through the spiral heat exchange pipe 12 structure, and the contact area is increased by more than 50%; the split heat conduction pipe 1 and the heat preservation pipe 3 are combined to make more than 90% of the heat exchange process complete in the underground constant temperature layer, effectively reducing the ground temperature interference; the adjustable spiral pipe length design makes the heat exchange area able to be dynamically optimized according to real-time temperature data, which can improve the heat exchange efficiency by more than 20% compared with the fixed structure; the multiple parallel pipelines are arranged in a matrix to form a matrix heat exchange network, which can reduce the stratum temperature disturbance by more than 40% compared with the traditional centralized layout.

[0057] By the technical scheme, the application solves the technical defects of the traditional ground source heat pump system, i.e. the heat exchange efficiency is limited by geological conditions, and long-term operation causes imbalance of stratum temperature. The spiral heat exchange pipe 12 and the split pipe design significantly improve the heat exchange efficiency of unit pipe length, and the adjustable structure enables the system to adapt to different geological conditions; the parallel arrangement scheme of multiple groups effectively disperses the heat exchange area, and avoids distortion of the stratum temperature field; the combination structure of the sealing plate and the communication pipe 2 realizes physical isolation of the underground and ground pipes, and ensures the integrity and controllability of the heat exchange medium circulation path. The design improves the geothermal utilization rate, and ensures the stability of long-term operation of the system through a dynamic adjustment mechanism.

[0058] The application further proposes that the heat storage mechanism includes a heat storage tank 6, the heat storage tank 6 is buried 2-5 meters below the ground, and the second heat exchange assembly includes a first heat exchange pipe 61 located in the heat storage mechanism, and both ends of the first heat exchange pipe 61 are connected in parallel with the medium discharge passage of the heat exchange area through a three-way valve 5.

[0059] The heat storage tank 6 is a container for storing the recovered heat in the building 7 and the solar heat, and can be implemented by filling paraffin / expansion graphite composite material in an aluminum alloy shell as heat exchange filler, and the heat preservation structure can reduce heat loss. The heat storage tank 6 is arranged in the underground constant temperature layer region, and the depth range can be determined through geological exploration, and the underground constant temperature characteristic is used to maintain the temperature stability of the heat storage tank 6. The first heat exchange pipe 61 is a heat transfer pipe connecting the heat storage mechanism and the heat exchange area, and can be implemented by using a corrosion-resistant metal pipe, and heat transfer is completed through circulation of the heat exchange medium. The three-way valve 5 is a valve for controlling the flow direction of the heat exchange medium, and can be implemented by using an electric three-way regulating valve, and the pipe connection state is switched by the control system command.

[0060] Specifically, the heat storage tank 6 forms a heat balance with the underground constant temperature layer through the buried depth, the first heat exchange pipe 61 of the second heat exchange assembly is connected to the medium discharge passage of the heat exchange area in a parallel manner, and a heat recovery path independent of the geothermal recovery area is formed. When the heat in the building 7 needs to be stored, the heat exchange medium flows into the first heat exchange pipe 61 in the heat storage tank 6 through the three-way valve 5, and transfers heat to the heat storage material; when the heat needs to be called, the medium flows in the reverse direction, and the heat in the heat storage tank 6 is transported to the heat exchange area through the first heat exchange pipe 61. The parallel design of the three-way valve 5 forms a complementary circuit of the heat storage mechanism and the geothermal recovery area, and dynamically adjusts the heat storage or release mode according to the temperature sensor signal.

[0061] Compared with the prior art, the traditional heat storage device adopts a water tank 8 inside the ground or the building 7, has high heat loss rate and cannot be efficiently cooperated with the geothermal system. The scheme realizes cross-season storage and multi-source complementary calling of heat energy by underground burying the heat storage tank 6 in combination with the three-way valve 5 in parallel structure, and avoids the problem of insufficient heat capacity of a single heat storage medium.

[0062] Through the above technical scheme, the application solves the technical problems of large heat loss of the traditional building 7 heat storage device and low multi-energy cooperation efficiency, realizes efficient storage and flexible calling of geothermal heat and building 7 waste heat, improves the operation stability of the system under day-night and seasonal fluctuations, and reduces the energy interference between different heat exchange components through the parallel pipeline design.

[0063] The application further proposes an operation mode control scheme of a green building 7 heating and ventilation system based on geothermal recovery, including setting a first circulating pump 4 on the heat exchange medium discharge channel 41 or the heat exchange medium discharge channel 42, setting a second circulating pump 81 on the third heat exchange component, and setting a third circulating pump 9 on the third heat exchange pipe 63. The control system controls the flow direction of the heat exchange medium according to the monitoring values of the environment temperature sensor, the first temperature sensor, the second temperature sensor and the third temperature sensor, forms five kinds of operation modes, and controls the heat storage tank 6 to recover solar heat and heat domestic water.

[0064] The first circulating pump 4 is a power device arranged on the heat exchange medium transmission path, which can be realized by a variable frequency centrifugal pump, and the flow rate and flow direction of the heat exchange medium are controlled by adjusting the rotating speed of the pump. The second circulating pump 81 and the third circulating pump 9 correspond to the transmission paths of solar heat recovery and domestic water heating respectively, and can be realized by high-temperature-resistant magnetic pumps. The temperature sensor adopts a digital temperature probe, such as a PT100 platinum resistance sensor, for real-time acquisition of temperature data in each region. The three-way valve 5 adopts an electric rotary valve, and the rotating angle of the valve core is automatically adjusted by the control system according to the temperature data. The five kinds of operation modes are switched based on the preset temperature threshold combination, for example, when the environment temperature is greater than or equal to 26℃ and the temperature in the building 7 is higher than the temperature of the heat storage tank 6, the system preferentially utilizes geothermal cold energy for cooling, and at the same time, the waste heat is stored in the heat storage tank 6.

[0065] Specifically, in mode one, when the ambient temperature is higher than 26℃ and the temperature in the building 7 is higher than the temperature of the heat storage tank 6, the cold energy absorbed by the geothermal recovery area is delivered to the heat exchange area in the building 7 through the first heat exchange pipe 61, and the three-way valve 5 guides the heat exchange medium to flow through the heat storage tank 6 for waste heat storage. In mode two, when the temperature in the building 7 is lower than the temperature of the heat storage tank 6, the heat exchange medium directly returns to maintain system efficiency. In mode three, when the ambient temperature is between 15-26℃, the system stops active temperature control to reduce energy consumption. In mode four, when the ambient temperature is lower than 15℃ and the temperature of the geothermal recovery area is higher than the heat storage tank 6, the system directly extracts geothermal heat for heating. In mode five, when the geothermal temperature is insufficient, the system supplements solar heat through the third heat exchange component. The solar heat recovery and the domestic water heating are independently controlled by the second and third circulating pumps 9, respectively, and the heat storage and calling of the heat storage tank 6 are realized by switching the three-way valve 5.

[0066] Compared with the prior art, the conventional system lacks a mode switching mechanism based on the linkage of multiple temperature parameters, and can only perform single-direction heat exchange control. For example, the conventional ground source heat pump system cannot dynamically adjust the heat exchange path according to the temperature of the heat storage mechanism, which easily causes energy waste. The present scheme realizes the multi-mode coordinated operation of building 7 heating, cooling, heat storage, solar utilization and domestic hot water supply by setting parallel heat exchange components and multiple circulating pumps, combined with a temperature threshold judgment mechanism, solving the problems of low single energy utilization efficiency and insufficient multi-energy coordination.

[0067] Through the above technical scheme, the present application realizes efficient comprehensive utilization of geothermal energy, solar energy and building 7 waste heat. Specifically, when the building 7 needs to be cooled, the system automatically selects the optimal cold source and stores waste heat; when heating is needed, the heat stored in the heat storage tank 6 is preferentially called and solar energy is supplemented; the domestic hot water heating and the building 7 temperature control system realize the cascade utilization of heat energy. This dynamic regulation mechanism significantly improves the energy utilization efficiency, avoids the energy mismatch problem caused by the fixed operation mode of the traditional system, and at the same time guarantees the operation stability of the system under different working conditions through the multi-path switching design.

[0068] The present application further proposes that the third heat exchange component includes a second heat exchange pipe 62, and the second heat exchange pipe 62 has a heat absorption area on the surface of the solar panel and a heat release area in the heat storage tank 6.

[0069] The solar heat recovery area refers to an area for collecting solar radiation energy and converting it into heat energy through multi-directional solar panels. Specifically, photovoltaic / photothermal integrated panels can be arranged on the roof, outer wall and open ground of the building 7 to expand the heat collection area and adapt to different light conditions. The second heat exchange pipe 62 refers to a pipe structure for transferring solar heat. Specifically, copper pipes or aluminum alloy pipes can be used as heat-conducting materials. The heat absorption area absorbs heat by adhering to the surface of the solar panel, and the heat release area extends to the inside of the heat storage tank 6 to realize heat exchange, thereby forming a closed heat transfer path.

[0070] Specifically, the solar panels are arranged in a three-dimensional layout on the roof, outer wall and ground to maximize the reception of solar radiation according to seasonal changes and differences in sunlight angles. The heat absorption area closely adheres to the light-receiving surface of the solar panel and absorbs the heat collected on the surface of the panel through the heat exchange medium flowing inside. The heated heat exchange medium is transported along the second heat exchange pipe 62 to the heat storage tank 6, where it exchanges heat with the heat storage material through the heat release area, thereby storing solar heat. This structure can be reversed in operation during rainy or night conditions to maintain system operation by calling the heat stored in the heat storage tank 6.

[0071] Compared with the prior art, the traditional solar heat collection system mainly uses a single installation method on the roof, which is greatly affected by the orientation of the building 7 and the surrounding environment. In addition, the separation of the heat storage device and the heat collection unit leads to heat loss. The present scheme widens the heat collection area through a three-dimensional layout and effectively improves the heat collection efficiency and storage stability by incorporating the heat release area inside the heat storage tank 6, while achieving seamless connection with the geothermal recovery system.

[0072] Through the above technical scheme, the present application solves the problem of fluctuation of heat collection efficiency caused by installation location limitation of the solar system. The heat source stability is ensured by multi-region collaborative heat collection, and the heat energy is cross-periodically allocated by using the heat storage tank 6, which makes up for the deficiency of the traditional system in continuous energy supply and improves the overall efficiency of multi-energy collaborative utilization.

[0073] The present application further proposes a green building 7 heating and ventilation system based on geothermal recovery, wherein the fourth heat exchange assembly includes a third heat exchange pipe 63 having a heat absorption part inside the heat storage tank 6 and a heat release part in the heat release part of the water tank 8.

[0074] The third heat exchange pipe 63 refers to a heat transfer device connecting the heat storage mechanism and the water tank 8. Specifically, it can be implemented in a serpentine coil or spiral pipe structure. The heat absorption part is embedded inside the heat storage tank 6 to absorb the stored heat energy, and the heat release part is immersed in the water tank 8 to heat the domestic water. This design exchanges heat between the heat storage mechanism and the water tank 8, converting the waste heat that was not previously utilized into a heat source for domestic hot water production, thereby improving energy utilization efficiency.

[0075] Specifically, when the heat stored in the heat storage tank 6 reaches a preset threshold, the control system starts the third circulating pump 9 to drive the heat exchange medium to circulate in the third heat exchange pipe 63. The heat exchange medium absorbs the stored heat when flowing through the heat absorption part in the heat storage tank 6, and then enters the heat release part in the water tank 8 to release heat to the domestic water. The temperature sensor monitors the water temperature of the water tank 8 in real time, and when the water temperature is lower than the set range, the system preferentially calls the heat of the heat storage tank 6 for supplementary heating; when the heat of the heat storage tank 6 is insufficient, other heat exchange components can be linked to work cooperatively. The process realizes the directional transmission of heat energy between the heat storage tank 6 and the water tank 8 through medium flow direction control, forming a closed loop heat recovery link.

[0076] Compared with the prior art, the traditional domestic hot water system is usually independently operated separately from the building 7 heating system, and needs to consume additional electric energy or gas heating. However, the present scheme directly couples the heat storage mechanism and the domestic water tank 8 through the third heat exchange pipe 63, and indirectly heats the water tank 8 by using the surplus solar energy, geothermal energy or building 7 waste heat in the heat storage tank 6, without the need to increase independent heat source equipment, which not only avoids the energy waste caused by heat dispersion in the traditional system, but also reduces the equipment investment cost.

[0077] Through the above technical scheme, the present application realizes the functional integration of the building 7 heating system and the domestic hot water preparation, and solves the heat loss problem caused by the separation of the heat storage device and the water supply module in the prior art. The surplus heat in the heat storage tank 6 can be transferred to the water tank 8 in time, which not only maintains the heat balance of the heat storage system, but also guarantees the stable supply of domestic hot water, while reducing the dependence on external energy.

[0078] The present application further proposes a green building 7 heating and ventilation system based on geothermal recovery, the heat conduction pipe 1 is slidably connected with a traction plate 13, the traction plate 13 is fixedly connected with the bottom of the spiral heat exchange pipe 12 through a U-shaped bolt sleeve 131, the bottom of the first sealing plate 11 is fixedly connected with an electric telescopic rod 14, the telescopic end of the electric telescopic rod 14 is fixedly connected with the traction plate 13, the spiral heat exchange pipe 12 is a corrugated pipe capable of stretching and contracting, and the control system controls the telescopic amount of the electric telescopic rod 14 according to the monitoring values of the environmental temperature sensor and the second temperature sensor.

[0079] The traction plate 13 is a bearing structure arranged inside the heat conduction pipe 1 and can slide in the axial direction, which can be realized by an alloy plate with a guide groove, and the bottom of the spiral heat exchange pipe 12 is fixedly supported through cooperation with the U-shaped bolt sleeve 131. The electric telescopic rod 14 is a linear actuator for driving the traction plate 13 to move, which can be realized by a structure of a servo motor cooperating with a ball screw, and is used for adjusting the unfolded length of the spiral heat exchange pipe 12 according to the temperature signal. The corrugated pipe is a tubular heat exchange element with the characteristics of axial stretching and contraction, which can be realized by a multi-layer stainless steel thin-walled corrugated structure, and the effective contact length of the heat exchange pipe in the heat conduction pipe 1 is changed by stretching and contraction.

[0080] Specifically, when the ambient temperature sensor detects a sudden drop in external temperature, the control system obtains the actual temperature of the heat exchange zone within the building 7 through the second temperature sensor. If the temperature difference exceeds a certain threshold, the electric telescopic rod 14 will push the traction plate 13 to move downward along the heat guide pipe 1, driving the spiral heat exchange pipe 12 to expand to increase its contact area with the heat guide pipe 1. At this time, the bellows structure can adapt to the length change to avoid stress damage due to deformation. Conversely, when the temperature difference is small, the electric telescopic rod 14 contracts to shorten the effective length of the spiral heat exchange pipe 12, reducing unnecessary heat exchange loss. This dynamic adjustment process optimizes the heat exchange efficiency in real time through a closed-loop control system.

[0081] Compared with the prior art, the traditional buried pipe adopts a fixed heat exchange structure, which cannot adjust the heat exchange area according to temperature fluctuations, easily causing energy waste or insufficient heat exchange. The present scheme combines a telescopic bellows with an intelligent driving mechanism, enabling the heat exchange area to be automatically adjusted according to environmental conditions, solving the technical problem that the underground constant temperature layer heat exchange efficiency is limited by the fixed pipe length.

[0082] Through the above technical scheme, the present application realizes dynamic optimization of the heat exchange capacity of the geothermal recovery system, and matches the actual demand by adjusting the effective length of the heat exchange pipe during day-night temperature difference or seasonal alternation. This design not only avoids the delay in building 7 heating caused by insufficient heat exchange in low-temperature environments in winter, but also reduces energy loss caused by excessive heat exchange in transition seasons, and the bellows structure effectively solves the sealing failure problem caused by thermal expansion and contraction of traditional rigid pipes.

[0083] The present application further proposes that the heat storage tank 6 comprises an aluminum alloy shell, the inside of the aluminum alloy shell is provided with a heat preservation sandwich structure, the heat preservation sandwich structure comprises a vacuum insulation board and a polyurethane foaming layer, and the heat storage tank 6 is provided with a paraffin / expansion graphite composite material as a heat exchange filler.

[0084] The aluminum alloy shell refers to the outer shell of the heat storage tank 6 made of aluminum alloy material, which can be realized by die casting process. The aluminum alloy material has high strength and corrosion resistance, and can withstand mechanical stress and chemical corrosion in the underground buried environment. The heat preservation sandwich structure refers to a composite thermal insulation layer composed of a vacuum insulation board and a polyurethane foaming layer. The vacuum insulation board blocks heat conduction through the internal vacuum environment, and the polyurethane foaming layer suppresses heat convection through the closed cell structure. The two form a double thermal insulation barrier. The paraffin / expansion graphite composite material refers to a phase change heat storage material formed by impregnating paraffin in the pores of expanded graphite. It can be prepared by a melting impregnation process. The porous structure of expanded graphite can absorb paraffin and enhance its thermal conductivity, achieving high heat storage density and fast heat response.

[0085] Specifically, the aluminum alloy shell of the heat storage tank 6 forms a sealed cavity through die casting, the internal vacuum heat insulation plate is laid along the circumference of the shell to form a first heat insulation layer, and the polyurethane foaming material is filled inside the vacuum heat insulation plate to form a second heat insulation layer. During the operation of the heat storage tank 6, the paraffin / expanded graphite composite material absorbs or releases latent heat in the phase change temperature range, when the temperature of the underground isothermal layer is higher than the set threshold, the heat transfer medium transfers heat to the composite material to complete heat storage; when heat needs to be released, the low-temperature medium flows through the heat storage tank 6 to promote the solidification of the composite material to release heat. The vacuum heat insulation plate and the polyurethane foaming layer work together to reduce the surface heat flux density of the heat storage tank 6 to less than 30% of the conventional single-layer insulation structure.

[0086] Compared with the prior art, the conventional heat storage device mainly uses a single stainless steel shell and a rock wool insulation layer, which has the problems of easy corrosion of the shell and rapid attenuation of the insulation performance. The present scheme combines an aluminum alloy shell and a composite insulation layer, which reduces the heat loss rate by about 40% under the same thickness, and the volume heat storage density of the paraffin / expanded graphite composite material is 1.8 times that of pure paraffin, solving the technical bottleneck of low heat storage density and large heat loss of traditional heat storage devices.

[0087] Through the above technical scheme, the heat storage tank 6 maintains stable structural strength under long-term underground burial conditions, the composite insulation layer effectively delays heat loss, and the phase change heat storage material realizes large-capacity heat energy storage and rapid response, so that the building 7 heating and ventilation system can call underground heat storage resources across seasons, and the multi-energy collaborative utilization efficiency is significantly improved.

[0088] The present application further proposes a green building 7 heating and ventilation system based on geothermal recovery, which includes a heat-conducting pipe 1 made of nickel-based high-temperature alloy pipe, and an insulation pipe 3 including a vacuum heat insulation inner pipe and a carbon fiber woven reinforcement layer from inside to outside, and an aerogel-metal foam composite layer is arranged between the vacuum heat insulation inner pipe and the carbon fiber woven reinforcement layer, the heat transfer medium inlet channel 41 and the heat transfer medium outlet channel 42 are arranged in the section of the ground surface or the external environment, and the heat insulation structure is arranged from inside to outside as a phase change buffer layer, a vacuum heat insulation layer and a reflective shielding layer.

[0089] The nickel-based high-temperature alloy pipe refers to a buried pipe heat conducting component made of nickel-based high-temperature alloy material, which can be specifically implemented by using a nickel-based alloy added with chromium and molybdenum elements. The material has excellent oxidation resistance and mechanical strength in a high-temperature environment. The carbon fiber woven reinforcing layer refers to a mesh structure layer formed by weaving carbon fibers, which can be specifically implemented by using a three-dimensional weaving process to interleave and stack carbon fiber bundles to improve the compressive strength of the pipeline and inhibit thermal expansion deformation. The aerogel-metal foam composite layer refers to a heat insulation layer formed by compounding aerogel powder and an open-cell metal foam matrix, which can be specifically implemented by using a vacuum impregnation method to fill silica aerogel into aluminum alloy foam pores. The phase change buffer layer refers to a temperature buffer structure layer containing a phase change material, which can be specifically implemented by using a paraffin / expansion graphite composite material to absorb or release heat through a phase change process to weaken the influence of external temperature fluctuations on the pipeline.

[0090] Specifically, the heat conducting pipe 1 is made of nickel-based high-temperature alloy material to improve the heat conducting efficiency while ensuring the durability in complex underground conditions. The heat preservation pipe 3 is sequentially provided with a vacuum heat insulation inner pipe, an aerogel-metal foam composite layer and a carbon fiber reinforcing layer from inside to outside, and high-efficiency heat preservation is achieved through the synergistic effect of vacuum insulation, nano-porous heat insulation and mechanical reinforcement. The heat insulation mechanism located in the ground pipe section is provided with a phase change buffer layer to absorb day and night temperature difference fluctuations, a vacuum heat insulation layer to block the heat conduction path, and a reflective shielding layer to reflect radiant heat energy. When the underground heat conducting pipe 1 is connected with the ground equipment, the multi-layer composite structure of the heat insulation mechanism can effectively inhibit heat loss, the phase change material absorbs solar radiation heat during the day and releases stored heat at night through phase change, forming a dynamic heat shield.

[0091] Compared with the prior art, the traditional buried pipe mainly uses ordinary steel pipe matched with a single polyurethane heat preservation layer, which has the problems of low heat conducting efficiency and poor anti-creep performance. The present scheme improves the heat transfer efficiency by using a nickel-based alloy pipe, and the thermal resistance of the composite heat preservation structure is about 3 times higher than that of conventional materials. The carbon fiber reinforcing layer makes the compressive strength of the pipeline reach 1.8 times that of the ordinary steel pipe. The existing ground pipeline mainly uses single rock wool insulation, which cannot cope with the periodic thermal stress caused by the day and night temperature difference. The phase change buffer layer of the present scheme can reduce the temperature fluctuation amplitude by 60%, and the reflective shielding layer reduces the solar radiation absorption rate to below 0.2.

[0092] Through the above technical scheme, the technical contradiction that the heat conducting efficiency and durability of the traditional buried pipe are difficult to be considered is effectively solved, and the heat loss of the ground pipe section is significantly reduced. The multi-level composite heat preservation structure realizes high-efficiency heat insulation while ensuring the mechanical strength, and the combination design of the phase change material and the vacuum heat insulation makes the system self-adapt to the environmental temperature change. The synergistic effect of the reflective shielding layer and the vacuum layer greatly weakens the influence of solar radiation on the pipeline, ensuring that the heat exchange medium maintains a stable temperature state during transportation.

[0093] The places not mentioned in the present application can be realized by using or referring to the existing technology.

[0094] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each of the embodiments focuses on the difference from other embodiments.

[0095] The above only describes the embodiments of the present application and is not used to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A green building heating and ventilation system based on geothermal recovery, characterized in that, The system comprises a heat exchange area located in a building, a geothermal recovery area located in a constant temperature layer, and a first heat exchange component provided between the heat exchange area and the geothermal recovery area to extract cold or heat from the geothermal recovery area and transfer the cold or heat to the building; The system further comprises a heat storage mechanism buried in the constant temperature layer, and a second heat exchange component provided in the heat storage mechanism and connected in parallel with the first heat exchange component to recover heat from the building; The system further comprises a solar heat recovery area, and a third heat exchange component provided in the heat storage mechanism to recover heat from the solar heat recovery area; The system further comprises a control system, an ambient temperature sensor, a first temperature sensor provided in the geothermal recovery area, a second temperature sensor provided in the heat exchange area of the building, and a third temperature sensor provided in the heat storage mechanism, and the control system controls the flow direction of heat exchange medium in the first, second, and third heat exchange components according to the monitoring temperature of the ambient, first, second, and third temperature sensors to increase or decrease the temperature of the environment in the building. The geothermal recovery area comprises a plurality of ground pipe assemblies arranged at intervals, the ground pipe assemblies are buried in the constant temperature layer, the first heat exchange component has a first heat exchange part located in the ground pipe assemblies and a second heat exchange part located in the heat exchange area, the ground pipe assemblies sequentially comprise a heat conducting pipe and an insulation pipe from bottom to top, the heat conducting pipe and the insulation pipe are connected by a communication pipe, a partition is provided in the middle of the communication pipe to divide the inner cavity of the communication pipe into a first channel and a second channel, the first heat exchange part comprises a spiral heat exchange pipe located in the heat conducting pipe, a first sealing plate is provided at the top of the heat conducting pipe, a second sealing plate is provided at the bottom of the insulation pipe, the spiral heat exchange pipe penetrates through the first sealing plate at both ends and is connected to the first channel and the second channel of the communication pipe respectively, the insulation pipe is provided with an inlet pipe and an outlet pipe, the lower ends of the inlet pipe and the outlet pipe penetrate through the second sealing plate and are connected to the first channel and the second channel of the communication pipe respectively, the second heat exchange part comprises a heat exchange medium inlet channel and a heat exchange medium outlet channel, the upper ends of a plurality of the inlet pipes are connected in parallel to the heat exchange medium inlet channel of the heat exchange area, and the upper ends of a plurality of the outlet pipes are connected in parallel to the heat exchange medium outlet channel of the heat exchange area. The heat storage mechanism comprises a heat storage tank buried 2-5 meters below the ground, the second heat exchange component comprises a first heat exchange pipe located in the heat storage mechanism, the two ends of the first heat exchange pipe are connected in parallel to the medium outlet channel of the heat exchange area through a three-way valve, a water tank is provided in the building for domestic water supply, a fourth heat exchange component is provided between the heat storage mechanism and the water tank, the fourth heat exchange component comprises a third heat exchange pipe having a heat releasing part located in the water tank and a heat absorbing part located in the heat storage tank.

2. The green building heating and ventilation system based on geothermal recovery according to claim 1, characterized in that, The water tank is provided with a fourth temperature sensor, and the control system controls the flow direction of heat exchange medium in the first, second, third, and fourth heat exchange components according to the monitoring value of the fourth temperature sensor.

3. The green building heating and ventilation system based on geothermal recovery according to claim 2, characterized in that, The first circulating pump is arranged on the heat exchange medium inlet channel or the heat exchange medium outlet channel, the second circulating pump is arranged on the second heat exchange assembly, and the third circulating pump is arranged on the third heat exchange pipe; the control system controls the flow direction of the heat exchange medium in the first heat exchange assembly, the second heat exchange assembly, the third heat exchange assembly and the fourth heat exchange assembly to have the following modes: Mode one, the environmental temperature sensor monitoring value is greater than or equal to 26 DEG C, the second temperature sensor monitoring value is greater than the third temperature sensor detection value, the heat exchange medium flowing through the geothermal recovery area is circulated to the building heat exchange area along the first heat exchange pipe, the medium inlet channel and the first circulating pump, the control system controls the valve core of the three-way valve to rotate, and the heat exchange medium after absorbing heat flows through the heat storage tank and then returns to the first heat exchange pipe; Mode two, the environmental temperature sensor monitoring value is greater than or equal to 26 DEG C, the second temperature sensor monitoring value is less than or equal to the third temperature sensor detection value, the heat exchange medium flowing through the geothermal recovery area is circulated to the building heat exchange area along the first heat exchange pipe, the medium inlet channel and the first circulating pump, the control system controls the valve core of the three-way valve to rotate, and the heat exchange medium after absorbing heat directly returns to the first heat exchange pipe; Mode three, 15 DEG C < environmental temperature sensor monitoring value < 26 DEG C, the building relies on the natural ventilation system to adjust the indoor temperature; Mode four, the environmental temperature sensor monitoring value is less than or equal to 15 DEG C, the first temperature sensor monitoring value is greater than the third temperature sensor monitoring value, the heat exchange medium flowing through the geothermal recovery area is circulated to the building heat exchange area along the first heat exchange pipe, the medium outlet channel and the first circulating pump, and then the heat exchange medium after heat release returns to the first heat exchange pipe in the geothermal recovery area; Mode five, the environmental temperature sensor monitoring value is less than or equal to 15 DEG C, the first temperature sensor monitoring value is less than the third temperature sensor monitoring value, the control system controls the three-way valve to rotate, and the heat exchange medium flowing through the geothermal recovery area is circulated to the building heat exchange area after being further heated in the third heat exchange assembly along the first heat exchange pipe and the medium outlet channel, and then the heat exchange medium after heat release returns to the first heat exchange pipe in the geothermal recovery area; The control system controls the second circulating pump to make the heat storage tank recover the heat of the solar heat recovery area; and the control system controls the third circulating pump to make the heat recovered in the heat storage tank pass through the fourth heat exchange assembly to heat the domestic water in the water tank.

4. The green building heating and ventilation system based on geothermal recovery according to claim 1, characterized in that, The solar heat recovery area comprises a plurality of solar panels arranged on the roof of the building and / or the outer wall of the building and / or the open ground outside the building, and the third heat exchange assembly comprises a second heat exchange pipe having a heat absorption area on the surface of the solar panel and a heat release area in the heat storage tank.

5. The green building heating and ventilation system based on geothermal recovery according to claim 1, characterized in that, A traction plate is slidably connected in the heat conduction pipe, the traction plate is fixedly connected with the bottom of the spiral heat exchange pipe through a U-shaped bolt sleeve, a first sealing plate is fixedly connected with an electric telescopic rod at the bottom, the telescopic end of the electric telescopic rod is fixedly connected with the traction plate, the spiral heat exchange pipe is a bellows pipe capable of telescoping, and the control system controls the telescopic amount of the electric telescopic rod according to the monitoring values of the environmental temperature sensor and the second temperature sensor.

6. The green building heating and ventilation system based on geothermal recovery according to claim 1, characterized in that, The heat storage box comprises an aluminum alloy shell, a heat preservation sandwich structure is arranged inside the aluminum alloy shell, the heat preservation sandwich structure comprises a vacuum heat insulation plate and a polyurethane foaming layer, and paraffin / expansion graphite composite material is arranged in the heat storage box as heat exchange filler.

7. The green building heating and ventilation system based on geothermal recovery according to claim 5, characterized in that, The heat conduction pipe is a nickel-based high-temperature alloy pipe, the heat preservation pipe comprises a vacuum heat insulation inner pipe and a carbon fiber woven reinforcing layer from inside to outside, an aerogel-metal foam composite layer is arranged between the vacuum heat insulation inner pipe and the carbon fiber woven reinforcing layer, the heat exchange medium inlet channel and the heat exchange medium outlet channel are provided with an adiabatic structure in the section of the ground surface and / or the external environment, and the adiabatic structure comprises a phase change buffer layer, a vacuum heat insulation layer and a reflection shielding layer from inside to outside.

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