51 results about "Ground heat exchanger" patented technology

A method of operating a thermal system implementing a ground-source heat pump includes receiving design parameters associated with a design of the thermal system and receiving one or more measurement inputs associated with a flow of a thermal fluid through a borefield of a ground heat exchanger. The method further includes, based on the measurement inputs and the design parameters, predicting one or more predicted thermal values of the thermal fluid using a forward model. The method further includes predicting one or more predicted borefield parameters of the borefield based on inverting the forward model. The method further includes monitoring the thermal system based on the predicted borefield parameters.

The invention relates to the technical field of ground source heat pumps, and discloses a buried pipe type heat exchanger temperature distribution determining method which is based on a U-shaped buried pipe heat exchange system and comprises the steps that an equilibrium equation is established, and initial conditions and boundary conditions are set; calculating thermal resistance of each part according to thermophysical parameters of rock soil and a system; determining an initial drilling wall temperature distribution and an initial fluid temperature distribution before the system begins to operate; determining the heat flux density of the rock soil converged outside the well in each small section of the U-shaped buried pipe; establishing a line source model equation set, and calculating drilling wall temperature distribution in a system operation process; well wall temperature distribution in the system operation process is substituted into the balance equation, and fluid temperature distribution and heat exchange amount in the system operation process are obtained; and performing cycle calculation according to the cycle index and the operation period. According to the method, the ground heat exchanger model is established through the virtual heat source method, the temperature distribution condition of rock soil and fluid in the well in the operation cycle is obtained, and the thermal behavior of the tube well in the drilled well is predicted.

The invention relates to a distributed cross-seasonal heat storage type ground source heat pump heating air-conditioning system group and a regulation and control method. The distributed cross-seasonal heat storage type ground source heat pump heating air-conditioning system group is composed of a plurality of distributed heating air-conditioning systems. Each distributed heating air-conditioning system is close to the served building and is provided with an independent ground heat exchanger, a heat pump, a circulating pump, a connecting pipeline, a heating air-conditioning user and an outdoor air heat exchanger; a plurality of distributed heating air-conditioning systems form a heating air-conditioning system group; the distributed heating air-conditioning systems in the group are subjected to centralized and unified power distribution, all the distributed heating air-conditioning systems are interconnected through a wireless communication network, operation data of all the distributed heating air-conditioning systems are shared, and centralized cooperative regulation and operation management are carried out. In spring and autumn, surplus wind, light and electric power are utilized to store heat or cold underground through a heat pump and a ground heat exchanger; in summer, the heat pump is used for air-conditioning refrigeration, and heat is discharged to the underground or air; in winter, heat of soil or air is extracted through the ground source heat pump to supply heat to a room.

The invention discloses a buried pipe temperature response calculation method considering underground water seepage and ground temperature gradient, and belongs to the field of building environment and energy application engineering.The buried pipe temperature response calculation method comprises the steps that a shallow buried pipe heat exchanger is regarded as a finite long-line heat source model, and when underground water seepage passes, the shallow buried pipe heat exchanger is regarded as a finite long-line heat source seepage model; an energy control equation containing a soil heat conduction item, an underground water seepage convection item and a ground temperature gradient correlation item at the same time is established, and initial temperature distribution based on ground temperature gradient, ground surface fixed wall temperature and boundary conditions of an underground limited boundary are set; and finally, obtaining an analytical solution expression of the change of the temperature at any position of the underground soil along with the time through analytical solution. According to the method, the defect that a traditional model ignores key environmental factors is overcome, the heat transfer process of heat conduction and convection coupling can be accurately simulated, the accuracy of temperature field prediction and the reliability of long-term performance evaluation are remarkably improved, meanwhile, the complexity of numerical calculation is avoided, and the calculation efficiency is improved.

Systems and methods using fluid flow through concentric channels for ground heat exchange. A heat exchange system may be installed by inflating a flexible tube in a borehole. An accessible subsurface adaptor provides connections between the heat exchange features and laterals, as well as the ability to measure and monitor performance of the system.

The utility model belongs to the technical field of tubular heat exchanger equipment, and particularly relates to a shallow sleeve type ground heat exchanger which comprises a straight pipe assembly, a U-shaped pipe assembly and a flange plate assembly, and the straight pipe assembly and the U-shaped pipe assembly are connected in a sealed mode through the flange plate assembly. The straight pipe assembly comprises an inner straight pipe and an outer straight pipe. The U-shaped pipe assembly comprises an inner U-shaped pipe and an outer U-shaped pipe. The flange assembly comprises a first flange and a second flange. The first flange plate and the second flange plate are detachably connected; two clamping blocks are installed at the side end of the first flange plate, inserting holes are formed in the side ends of the clamping blocks, a first gasket is installed at the bottom of the first flange plate, and a plurality of first through grooves are formed in the first gasket; an inserting groove is formed in the bottom of the second flange plate, a sliding groove is formed in the second flange plate, the inserting groove communicates with the sliding groove, a through hole is formed in the side end of the second flange plate, an inserting assembly is arranged at the position of the through hole, a second gasket is installed at the bottom of the second flange plate, and a plurality of second through grooves are formed in the second gasket.

The present application belongs to the technical field of geothermal energy development and utilization, and relates to a hydrothermal type buried pipe heat exchanger optimization design method based on PINN, comprising: 1, numerical simulation and benchmark data set generation; 2, PINN construction and training: constructing a PINN neural network, converting the mass conservation equation and the energy conservation equation in the pore medium into a partial differential equation residual, and together with the discrete data error generated by the numerical simulation software to form a composite loss function; using the nonlinear fitting capability of the PINN neural network, and embedding the physical partial differential equation of fluid flow and heat transfer in the pore medium into the loss function as a soft constraint; 3, data-driven optimization based on the proxy model; the present application not only fundamentally solves the problems of poor generalization ability and easy non-physical interpretation of traditional pure data-driven models, but also breaks through the bottleneck of convergence difficulty and high training cost when solving complex engineering problems by pure PINN.

The present invention relates to a thermal management system and energy storage station for a sodium-electric energy storage device. The thermal management system includes: an above-ground heat exchanger disposed within the sodium-electric energy storage device; an above-ground temperature sensor disposed within the sodium-electric energy storage device; multiple underground heat exchangers that can be dispersedly buried underground at the site where the sodium-electric energy storage device is located; multiple underground temperature sensors that can be buried underground and adjacent to the multiple underground heat exchangers; a control pipeline that connects the above-ground heat exchanger and each underground heat exchanger and includes a control valve group and a drive pump; and a control unit that is electrically connected to the control valve group, the drive pump, the above-ground temperature sensor, and each underground temperature sensor. The thermal management system can effectively manage the thermal state of the sodium-electric energy storage device and has the advantages of energy saving, high efficiency, low cost, and compact size, which is conducive to promoting the popularization and application of sodium-electric energy storage devices.

A heat exchanger (20) for a heating network, in particular a cold district heating network or long-distance heating network, with at least one heat transfer surface for transferring heat from a network fluid of the heating network to a building heating fluid of a building heating system of a building (7), in particular a residential building, wherein at least one flow connection (5) for the building heating fluid and at least one return connection (5) for the building heating fluid are provided, is proposed, which is improved compared to the state of the art, in particular reducing the effort and / or increasing the energy efficiency and the economic efficiency and / or realizing new functionalities.This is achieved according to the invention by the heat exchanger (20) being designed as a ground heat exchanger (20), wherein the ground heat exchanger (20) has at least one ground contact surface for the ground and wherein the ground heat exchanger (20) has at least one heat network inlet (21) for receiving a heat network line (1), in particular a heat network pipe (1), of the heat network, wherein the heat network inlet (21) comprises at least the heat transfer surface.

The invention discloses a compressed air energy storage system coupled with a deep ground source heat pump, which comprises a compressed air energy storage system, a deep ground source heat pump system and a heat user side, an expansion end heat exchanger in the compressed air energy storage system is connected with an expansion end liquid storage tank and a ground heat exchanger in the deep ground source heat pump system; the compression end heat exchanger is connected with a compression end liquid storage tank and a heat user end intermediate heat exchanger, and meanwhile, a buried pipe heat exchanger of the deep ground source heat pump system is also connected with the heat user end intermediate heat exchanger and serves as a supplementary heat source of a compressed air energy storage system and a heat user end; and renewable heat energy is introduced to optimize and improve the heat energy distribution utilization and energy supply level of the compressed air energy storage system. Through a coupling mode, the utilization and consumption capability of the system for renewable energy sources is enhanced, peak shifting scheduling of low-grade energy sources in the system is realized, and the stability and continuity of system operation are improved; the defects that when a traditional compressed air system is coupled with the heat user side, the coincidence degree of the heat energy demand period is high, the heat source temperature is unstable, and the heat supply amount is insufficient are overcome, so that the energy distribution mode of the coupling system is more reasonable, and the operation mode is more diversified.

The invention belongs to the field of shallow geothermal resources, particularly provides a shallow geothermal energy multi-field coupling simulation experiment system, and aims to solve the problems that traditional numerical simulation lacks physical authenticity, and field test is high in cost, long in period and uncontrollable. An experiment platform box body integrated with a layered simulation geologic body is constructed, and systems such as groundwater runoff simulation, mesh temperature control, a heat interference source, buried pipe heat exchange and water pumping and filling wells and the like are cooperatively operated; a'heat-water-force 'multi-physical field coupling environment including underground water seepage, ground temperature field distribution and ground source / water source heat pump engineering activities is truly simulated, so that the development process of shallow geothermal energy is accurately simulated.

The invention belongs to the technical field of underground pipe geothermal heating, and relates to an asymmetric arrangement method and design method of a buried pipe group for an underground water seepage field, and the method comprises the following steps: in the flowing direction of underground water, the depth of buried pipes is non-uniformly distributed according to the gradient principle of'shallow upstream and deep downstream '; the horizontal distances between the buried pipes are non-uniformly distributed according to the principle that the upstream is dense and the downstream is sparse; in the three-dimensional space, the adjacent buried pipes are distributed in a stepped mode or a staggered mode through differential arrangement of the depth and the distance, so that the heat affected zones of all the wells are overlapped in a staggered mode in the vertical direction and the horizontal direction. The depth, the horizontal distance and the arrangement form of the buried pipes are differentially adjusted in the seepage direction, so that the heat extraction strength of a pipe group is matched with the heat-carrying recovery capacity of underground water in space, cold accumulation is restrained, and dynamic balance of a regional rock-soil thermal field and long-term efficient and stable operation of a system are achieved.

The present invention is a system for generating electricity using the temperature difference between the surface and underground of a planet in combination with solar energy. Utilizing the temperature difference between the surface and underground of a planet that has the opportunity to be exposed to sunlight, a uniquely structured ground heat exchanger is used on a planet that can be periodically exposed to sunlight to fully utilize its surface and underground heat and cold sources. The system then combines this with an organic Rankine cycle to perform heat-to-work conversion, thereby achieving thermoelectric power generation on the planet. To save costs, the present invention uses a reasonable structural design to enable the heat-to-work conversion system to operate in both forward and reverse directions. To adapt to different usage scenarios, the present invention can flexibly select different working fluids based on the specific temperature conditions of the planet, so that the system's power generation efficiency can always reach the optimal level for the current situation. This type of power generation method can largely get rid of dependence on solar radiation, and can also obtain relatively stable, high-quality electricity in places where sunlight cannot always be irradiated.

The invention relates to a thermal management system for a sodium electricity energy storage device and an energy storage station, and the thermal management system comprises an overground heat exchanger which is arranged in the sodium electricity energy storage device; the overground temperature sensor is arranged in the sodium electricity energy storage device; the underground heat exchangers can be dispersedly buried under the ground of a site where the sodium electricity energy storage device is located; the plurality of underground temperature sensors can be buried underground and are adjacent to the plurality of underground heat exchangers one by one; the control pipeline is connected with the ground heat exchanger and each underground heat exchanger, and comprises a control valve group and a driving pump; and the control unit is electrically connected with the control valve group, the driving pump, the overground temperature sensor and the underground temperature sensors. The thermal management system can perform effective thermal management on the sodium electricity energy storage device, has the advantages of energy conservation, high efficiency, low cost, compact size and the like, and facilitates promotion of popularization and application of the sodium electricity energy storage device.

The invention discloses a ground source heat pump electric heating power conversion calculation method considering variable flow buried pipe heat exchange characteristics, and belongs to the field of comprehensive energy and electric power system comprehensive dispatching, and the ground source heat pump electric heating power conversion calculation method comprises the steps that 1, a thermal model of a single U-shaped buried pipe under variable flow regulation is established, obtaining a linear relation between the temperature of an outlet and an inlet of the fluid and the temperature of a drill hole wall when the flow of the fluid in the single U-shaped buried pipe changes; 2, the method is popularized to a thermal model of a multi-U-shaped buried pipe system, the linear relation between the outlet and inlet fluid temperatures and the borehole wall temperature when the terminal fluid flow changes is obtained, and the extracted total heat is calculated through the flow of each branch and the temperature difference between the inlet and the outlet; and 3, establishing a variable-flow electric-thermal coupling model of the ground source heat pump to obtain an electric-thermal power conversion relation among the heating power of the ground source heat pump, the temperature of the starting end inlet and the output temperature of the drilling field. According to the invention, the fluid flow is used as a continuous regulation variable, so that the operation flexibility of the ground source heat pump system is improved.

A system and method for in ground heat exchange, including at least one first array and one second array, each first and second array comprising a plurality of capped pipes; at least one temperature sensor; and at least one flow rate sensor, a plurality of flow rate valves connected to each first array and second array, the flow rate valves configured to facilitate flow of a liquid through the system; at least one pump attached to the flow rate valves for modulating the flow rate of the system; and a heat pump, wherein the system is configured to provide heating and cooling to a building.

The invention provides a solar middle-deep layer ground source heat pump flexible heat supply system and a design calculation method. The system comprises a solar heat collector, a middle-deep layer sleeve type buried pipe heat exchanger, a heat pump unit and a heat exchanger. The solar heat collector is connected with the heat exchanger; the heat exchanger is connected with the middle-deep layer sleeve type buried pipe heat exchanger and a user side through a three-way adjusting valve group; the middle-deep layer sleeve type ground heat exchanger is connected with the heat pump unit through the valve group, and the heat pump unit is connected with the user side through the valve group; the solar heat collector collects low-grade heat energy, and part of the low-grade heat energy is stored underground through the middle-deep layer sleeve type buried pipe heat exchanger and used for flexible regression of an underground temperature field deviating from an initial value under the influence of heat extraction. The ground source heat pump unit converts low-grade heat energy into high-grade heat energy. The invention further provides a design calculation method based on the system. On the basis of the heat transfer model, the quantitative regulation operation method of the heat supply system is provided to guide flexible and efficient operation of the composite system.

The application provides a ground source heat exchanger installation structure and a ground source heat exchanger installation method. The ground source heat exchanger installation structure comprises a ground buried pipe heat exchanger, a horizontal connecting pipe and a cantilever beam support. The ground buried pipe heat exchanger is arranged on the outside of a building body. The horizontal connecting pipe is connected with the ground buried pipe heat exchanger and extends horizontally from the outside of the building body. The cantilever beam support is installed horizontally on the outside of the building body. When the horizontal connecting pipe connected with the ground buried pipe heat exchanger extends along the outside of the building body, even if the outside of the building body still needs to be continuously constructed, such as pit backfilling and the like, the horizontal connecting pipe is not easily bent and damaged by the stress of the pit backfilling due to the support of the cantilever beam support on the lower side of the horizontal connecting pipe, the horizontal connecting pipe is effectively protected, the risk of gas collection after the horizontal connecting pipe is connected in an up-down bending manner is reduced, and the stable and efficient operation of the ground source heat exchanger system is ensured.

The invention belongs to the technical field of buried pipe heat exchange, and relates to a PINN-based shallow buried pipe heat exchanger optimization design method, which comprises the following steps of: 1, simulating a high-fidelity numerical value and generating a reference data set; 2, constructing a physical information neural network; 3, verifying the consistency of the training model and the physics; 4, performing multi-target automatic optimization based on the micro agent model; according to the method, the physical mechanism is generated in the data driving model, and the differentiable end-to-end optimization framework is constructed, so that the core defects of physical incredibility, low optimization efficiency, flow splitting and the like of an agent model in the prior art are fundamentally solved, and the crossing from'rapid simulation 'to'reliable optimization' is realized.

A geothermal heat storage intelligent regulation and control heat exchange device comprises a water injection section, a connecting section, a water outlet section and a ground heat exchanger, the connecting section is communicated with the water injection section and the water outlet section, a circulating medium is injected into the water injection section and circulates in the connecting section, the water outlet section and the ground heat exchanger, and a filtering assembly is rotationally installed in the water outlet section. A micro-electrostatic module is installed at the joint of the water outlet section and the ground heat exchanger, a plurality of reinforcing rings are installed on the peripheries of the water injection section and the water outlet section, suspended solids passing through the filtering assembly are adsorbed and removed, blockage of a heat exchange channel is avoided, through the reinforcing rings, the strength of the water injection section and the strength of the water outlet section can be improved, and the phenomenon that the water injection section and the water outlet section are damaged due to soil extrusion is avoided.

The invention relates to the technical field of new energy and heat pumps, in particular to a split frame type solar absorption heat pump coupling system and a multi-mode cooperative control method, and the split frame type solar absorption heat pump coupling system comprises a split heat source module, a heat pump host unit and an intelligent control box. The split type heat source module is composed of a solar heat collection array, a ground heat exchanger and a phase change heat storage tank and supports rapid assembly and disassembly. The heat pump host unit comprises an absorption type refrigeration cycle unit and a compression type heat pump auxiliary unit; the intelligent control box integrates an embedded controller and an Internet of Things communication module, and multi-sensor linkage and AI energy efficiency optimization are achieved. According to the system, through a multi-energy complementary coupling mechanism and intelligent mode switching, the energy utilization efficiency and the system stability are remarkably improved, and the system is suitable for various scenes such as building heating, refrigeration and industrial waste heat recycling.

The utility model belongs to the technical field of ground source heat pumps, and particularly relates to an automatic temperature control device of a ground source heat pump, which comprises a land and a buried heat exchanger, the buried heat exchanger is buried in the land, the top of the land is provided with a water pump unit, and the output end and the input end of the water pump unit are respectively provided with a first water pipe and a second water pipe. The end, away from the water pump unit, of the first water pipe and the end, away from the water pump unit, of the second water pipe extend into the underground heat exchanger, an inner cavity of the underground heat exchanger is slidably connected with a partition plate, the partition plate divides the inner cavity of the underground heat exchanger into an upper cavity and a lower cavity, and the upper cavity is formed in the upper portion of the lower cavity. The driving mechanism is used for driving the partition to move vertically. According to the utility model, the water distribution in the underground heat exchanger can be dynamically adjusted according to seasonal changes and actual requirements, so that the heat exchange efficiency is improved, the response time is shortened, and the purpose of quickly adjusting the indoor temperature is achieved.

The application provides a heat transfer calculation method, equipment and storage medium for a borehole casing structure ground heat exchanger, and belongs to the ground heat exchanger field, and comprises the following steps: obtaining user load data, heat exchanger system parameters and environmental parameters; setting a time step, establishing a borehole wall heat flux linear function along the depth direction, a borehole wall temperature calculation model and a fluid temperature calculation model; data initialization; in a preset time period, the borehole wall temperature distribution, the fluid temperature distribution and the borehole wall heat flux distribution in the current time step are sequentially calculated repeatedly at the set time step, and then the fluid temperature at the inlet of the ground heat exchanger is calculated according to the user load data. The borehole wall heat flux linear function is introduced, and on this basis, the borehole wall temperature calculation model for directly solving the borehole wall temperature through convolution is established, so that the integral calculation which needs to consume a large amount of calculation resources and a long calculation time is avoided, and the rapid calculation of the system heat transfer process is realized.

The present application relates to the technical field of renewable energy, in particular to a buried pipe, a heat exchange system and a use method of the buried pipe. The buried pipe comprises: a water inlet pipe provided with a water inlet; a water outlet pipe arranged at intervals from the water inlet pipe, and provided with a water outlet; a horizontal pipe structure comprising a shallow horizontal pipe and a deep horizontal pipe, the shallow horizontal pipe and the deep horizontal pipe being respectively communicated with the water inlet pipe and the water outlet pipe; a first opening and closing structure arranged in the water inlet pipe, the height of the first opening and closing structure being lower than the shallow horizontal pipe; and a second opening and closing structure arranged in the shallow horizontal pipe. The present application solves the problems of the geothermal heat exchange system, such as the need for multiple equipment cooperation, large investment and complex structure, thereby providing a buried pipe, a heat exchange system and a use method of the buried pipe.

The invention discloses a ground heat exchanger design method suitable for a geothermal energy storage and utilization system, the geothermal energy storage and utilization system is used for supplying heat and cold to a building and comprises a heat pump unit, a heat source tower and ground heat exchangers, and the ground heat exchangers are respectively arranged in energy storage units of a geothermal energy storage area; the design method of the ground heat exchanger comprises the following steps that S1, the soil average volumetric specific heat capacity CV of the geothermal energy storage area is measured and calculated through a coring method; s2, calculating the total energy storage energy Q storage of the single energy storage unit; and S3, according to the annual cold load Q cold and heat load Q heat of the building, the maximum heat absorption quantity Q heat absorption and the maximum heat release quantity Q heat release of the buried pipe heat exchangers in the geothermal energy storage area are calculated, the number n of energy storage units is calculated, and the number of the buried pipe heat exchangers is determined. According to the method, the relation between the energy storage capacity of the soil and the annual cooling and heating load of the building can be reflected more truly, the number of the buried pipe holes can be reduced, and the construction investment is effectively reduced.

The invention provides a ground cooling system double-fluid coupling temperature field modeling and solving method, which comprises the following steps: constructing a physical model of a double-fluid coupling temperature field suitable for a ground heat exchanger based on a reverse / same-direction heat exchange scene and assumed conditions of high-temperature drilling fluid and low-temperature cooling fluid in a ground cooling system; based on the built inner pipe fluid heat conduction control equation, the built outer pipe fluid heat conduction control equation, the built total heat transfer coefficient calculation equation and the built auxiliary equation, a mathematical model of the double-fluid coupling temperature field is built; according to the physical model and the mathematical model, constructing a double-fluid coupling temperature field model of the ground cooling system; and solving the ground cooling system double-fluid coupling temperature field model through an iterative solution method to obtain a double-fluid temperature field distribution result. The problem that an existing model neglects double-fluid coupling and pipe wall thermal resistance is solved, simulation precision is high, solving is fast, parameter optimization of a ground cooling system can be guided, and safe and efficient deep well drilling is guaranteed.

The invention discloses a buried pipe heat exchanger with a self-heat-storage function, and relates to the technical field of buried pipe heat exchange devices, a heat collection device is used for collecting heat in the environment and exchanging heat with a double-working-medium driving device, and a low-boiling-point working medium in the double-working-medium driving device is vaporized after absorbing heat and enters a liquid accumulation device; the cooling device can cool and liquefy the low-boiling-point working medium flowing out of the liquid accumulation device and enables the liquid-state low-boiling-point working medium to flow back into the double-working-medium driving device, the current-carrying fluid circulation pipe set is buried in underground soil and exchanges heat with the heat supply system, and the double-working-medium driving device communicates with an inlet of the current-carrying fluid circulation pipe set. After a low-boiling-point working medium in the double-working-medium driving device absorbs heat, a current carrying body can enter the current carrying body circulation pipe set and release heat, an outlet of the current carrying body circulation pipe set communicates with the cooling device, and the current carrying body obtained after heat release flows back into the double-working-medium driving device. Heat converted from solar energy or air energy can be autonomously stored in underground soil, and other energy consumption is not needed.

The utility model discloses an energy pipe piece based on circulating medium deformed steel bars, which belongs to the technical field of energy equipment and comprises a reinforcement cage consisting of circulating medium deformed steel bars and solid deformed steel bars, the circulating medium deformed steel bars are communicated with one another to form a medium circulating pipeline, concrete is arranged on the reinforcement cage, the reinforcement cage is positioned in the concrete, and the solid deformed steel bars are arranged in the concrete. And the opening end of the medium circulating deformed steel bar is arranged outside the concrete and is connected with the heat exchange system. According to the energy pipe piece, an original traditional ground heat exchanger and an original traditional capillary heat exchanger are abandoned, original partial solid deformed steel bars are replaced with deformed steel bars where media can circulate, the deformed steel bars with high strength are directly used as heat exchanger pipelines, damage caused by other cross work types in the construction process is avoided, and the energy pipe piece is suitable for large-scale production. The novel energy pipe piece is simple in structure and good in heat conduction capacity, so that the novel energy pipe piece can save extra heat exchanger pipes and initial investment cost, and meanwhile the novel energy pipe piece is simple in overall structure and good in heat conduction performance.

The invention discloses a vertical buried pipe backfill material with a phase change temperature regulation function and a preparation method, and belongs to the technical field of ground source heat pump system engineering materials. The material comprises the following components in percentage by weight: 30-45% of a cement-based cementing material, 10-20% of a multifunctional phase change microcapsule, 25-40% of aggregate, 2-8% of a functional additive and 8-20% of water, the multifunctional phase change microcapsule is composed of a paraffin and CaCl2 particle inner core, a bacillus pasteurii spore middle layer and a temperature-sensitive polymer shell. The temperature fluctuation is stabilized through paraffin phase change, graded repair of cracks is triggered through temperature-sensitive response, and the temperature-sensitive self-repairing material has the characteristics of efficient temperature adjustment, active self-repairing, high stability and excellent comprehensive performance, is simple and controllable in preparation process, is suitable for long-term stable operation of a vertical buried pipe system, and has wide application prospects. The problems that a traditional material is single in temperature adjustment, prone to cracking and ineffective in sealing are effectively solved.