21 results about "Ground heat exchanger" patented technology

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.

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 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 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 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.

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 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 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.

The invention relates to the technical field of ground source heat pumps, and discloses a heat removal and irrigation dual-mode U-shaped ground heat exchanger and a using method thereof.The heat exchanger comprises an outer pipe, an inner pipe and an adjustable inter-pipe locking mechanism; the outer pipe is U-shaped and is buried underground for heat exchange; a boss is arranged in the outer pipe in an extending mode and used for supporting the inner pipe, and the boss is arranged at a pipe opening of the outer pipe. A multi-stage controllable seepage hole array is arranged on the outer pipe; the inner pipe extends into the outer pipe; the inner pipe is provided with a conducting hole array corresponding to the multi-stage controllable seepage hole array; the adjustable inter-pipe locking mechanism is connected with the inner pipe, and the multi-stage controllable seepage hole array and the through hole array are aligned and conducted or closed in a staggered mode by lifting the inner pipe; and the multi-stage controllable seepage hole array is arranged at a pipe orifice of the outer pipe. The heat exchange and irrigation functions are integrated, an independent irrigation system is omitted, land resource sharing of the underground heat exchange system and the irrigation system is achieved, and the utilization efficiency of the underground space is improved.

The invention relates to a buried pipe heat exchange system design method based on multi-source data fusion and intelligent optimization. The method is suitable for the technical field of buried pipe heat exchange system design. According to the technical scheme, the buried pipe heat exchange system design method based on multi-source data fusion and intelligent optimization comprises the steps that S100, geological survey data and thermal response test data of a target area are obtained; s200, generating a design parameter combination of the buried pipe, and performing numerical model simulation in combination with the geological survey data and the thermal response test data to obtain model simulation data; s300, inputting the model simulation data, the geological survey data and the thermal response test data into the trained machine learning model to obtain a performance analysis result corresponding to the design parameter combination; s400, when the performance analysis result does not meet the preset requirement, returning to the step S200, and generating a new design parameter combination; and when the performance analysis result meets the preset requirement, a design scheme of the buried pipe heat exchange system is obtained.

The invention discloses a method for constructing a heat transfer model of a buried pipe heat exchanger and determining the hole depth of the buried pipe heat exchanger, and aims to solve the technical problem that the drilling depth of the current buried pipe heat exchanger is unreasonable. According to the technical scheme, based on the heat transfer model of the ground heat exchanger, the interval approximation method is adopted, the better burial depth range is gradually refined, so that the optimal arrangement hole depth within the specific depth range is found, the method is simple and scientific, the accuracy of predicting the performance of the ground heat exchanger can be improved, and then the efficiency and reliability of a ground source heat pump system are improved.

The invention discloses a solar energy-soil source coupling heat pump system with a self-heat-storage function, and relates to the technical field of coupling heat pump systems, a buried pipe heat exchanger with the self-heat-storage function is used for capturing heat in the environment, and a current-carrying fluid circulation pipe set of the buried pipe heat exchanger with the self-heat-storage function is used for exchanging heat with a heat exchange loop module; the heat exchange loop module is used for providing heat for a user, the carrier fluid circulation pipe set is arranged close to the heat removal pipe set, the heat removal pipe set is used for capturing heat in soil, the heat removal pipe set can communicate with the heat exchange loop module, and the heat removal pipe set is used for exchanging heat with the heat exchange loop module. The double-working-medium driving device of the ground heat exchanger with the self-heat-storage function can communicate with a heat exchange loop module and a user, can directly provide heat for the user, and can exchange heat with the heat exchange loop module. Heat converted from solar energy or air energy can be autonomously stored in underground soil, other energy consumption is not needed, and heat supply is stable.

The invention discloses a photovoltaic photo-thermal coupling terrestrial heat multi-energy utilization system which is mainly composed of a water source heat pump unit, a ground heat exchanger, a PV / T heat collector and an energy storage water tank which are mutually connected through pipelines and connected with an air conditioner cold / hot water inlet pipe, an air conditioner cold / hot water return pipe, a domestic hot water inlet pipe and a domestic hot water return pipe. Accordingly, the inventor further establishes a corresponding control method, and the functions of refrigeration in summer, heating in winter, hot water production, direct cooling, efficient power generation and the like are achieved by controlling opening and closing of the electric adjusting valve arranged on the pipeline. Solar energy, geothermal energy and conventional energy are coupled and are in pairwise complementary gradient utilization, the temperature of the solar cell panel can be reduced, the photoelectric conversion efficiency can be improved, hot water can be generated for heat supply, soil source heat absorption and release balance is ensured, and renewable energy sources are recycled to the maximum extent.

The application discloses a coaxial sleeve type ground buried pipe, a ground source heat pump system and a regulation and control method thereof, belongs to the technical field of ground source heat utilization, and can solve the problem of low operation energy efficiency of an existing ground source heat pump system. The ground buried pipe comprises a coaxially sleeved inner pipe and outer pipe, an annular cavity is formed between the inner pipe and the outer pipe, the top end of the annular cavity is communicated with the evaporator outlet of a heat pump unit through an inlet pipe, the top end of the inner pipe is communicated with the evaporator inlet of the heat pump unit through an outlet pipe, the bottom end of the inner pipe is communicated with the annular cavity through a water suction pipe, a first electromagnetic valve is arranged at one end of the inlet pipe connected with the evaporator outlet, a second electromagnetic valve is arranged at one end of the outlet pipe connected with the evaporator inlet, a circulating pipe is communicated with the inlet pipe and the outlet pipe at two ends, a third electromagnetic valve is arranged on the circulating pipe, a heat exchange medium can flow to fill the inner pipe, the annular cavity, the inlet pipe, the outlet pipe and the circulating pipe, and a circulating pump is arranged on the circulating pipe. The application is used for collecting ground source heat.

The utility model discloses an energy efficiency improving system for a shallow buried pipe heat exchanger. A closed or semi-closed heat storage area unit is arranged in a surrounding mode through area heat insulation plates. The heat storage area unit comprises a plurality of heat storage wells, a plurality of shallow water lifting wells, a plurality of deep water lifting wells, a plurality of solar water heaters, a heat storage water tank, a plurality of U-shaped vertical buried pipes and a ground source heat pump machine room; the buried depth of the regional heat insulation plate is arranged in soil of an earth crust constant temperature zone and penetrates through an earth crust daily variable temperature zone and an earth crust annual variable temperature zone from top to bottom, the buried depth H of the regional heat insulation plate is larger than or equal to H2 + 0.5-1 m, and H2 is the depth of the annual variable temperature zone; the heat storage well is of an inner and outer sleeve type hollow structure provided with a plurality of horizontal branch pipes shaped like a cross or a Chinese character'jing ', and the horizontal branch pipes are arranged in soil of a crustal annual variable temperature zone and a constant temperature zone. The buried depth H of the upper horizontal branch pipe is greater than or equal to H1 + 0.5-1m, and the buried depth H of the lower horizontal branch pipe is greater than or equal to H2 + 0.5-1m; h1 is the daily variable temperature zone depth, and H2 is the annual variable temperature zone depth.

The invention discloses a coaxial sleeve type buried pipe, a ground source heat pump system and a regulation and control method of the ground source heat pump system, belongs to the technical field of ground source heat utilization, and can solve the problem that an existing ground source heat pump system is low in operation energy efficiency. The buried pipe comprises an inner pipe and an outer pipe which are coaxially arranged in a sleeved mode, an annular cavity is formed between the inner pipe and the outer pipe, and the top end of the annular cavity is communicated with an evaporator outlet of the heat pump unit through an inlet pipe. The top end of the inner pipe communicates with an evaporator inlet of the heat pump unit through an outlet pipe, and the bottom end of the inner pipe communicates with the annular cavity through a water suction pipe. The first electromagnetic valve is arranged at one end of the inlet pipe connected with the evaporator outlet; the second electromagnetic valve is arranged at one end of the outlet pipe connected with the evaporator inlet; two ends of the circulating pipe are respectively communicated with the inlet pipe and the outlet pipe; the third electromagnetic valve is arranged on the circulating pipe; the inner pipe, the annular cavity, the inlet pipe, the outlet pipe and the circulating pipe are filled with the heat exchange medium in a flowable manner; and the circulating pump is arranged on the circulating pipe. The device is used for collecting ground source heat.