Horizontal pipe connecting method for ground source heat pump

Abstract

The application discloses a buried pipe ground source heat pump horizontal pipeline connecting method and relates to the technical field of ground source heat pump pipeline construction. The method comprises the following steps: S1, precisely calibrating deep and shallow layer adaptation pipe burying parameters; S2, layering and staggered heat insulation pipe laying construction; S3, layering and staggered soil temperature field monitoring unit; S4, same-path parallel balanced pipe laying networking; S5, independently segmented and maintainable pipe laying; and S6, modularized sealing butt joint pipe connecting construction. The buried pipe ground source heat pump horizontal pipeline connecting method can effectively balance the heat exchange working condition of the pipe network, prevent soil cold and heat accumulation, improve the pipeline sealing stability and reduce operation and maintenance costs through the precise calibration of deep and shallow layer parameters, layering and staggered heat insulation pipe laying, global temperature field monitoring, same-path parallel balanced networking, independently segmented and maintainable pipe laying and modularized sealing butt joint technology.

Description

Technical Field

[0001] This invention relates to the field of ground source heat pump pipeline construction technology, and in particular to a method for connecting horizontal pipelines of a buried ground source heat pump. Background Technology

[0002] Ground source heat pump systems with buried pipes are widely used in building heating, cooling, and hot water supply due to their advantages of energy saving, environmental protection, stable operation, and high energy efficiency. As the core heat exchange component of a ground source heat pump system, the laying process and connection structure of the horizontal buried pipes directly determine the system's heat exchange efficiency, operational stability, and subsequent maintenance costs.

[0003] Currently, the construction of horizontal pipe networks for ground source heat pumps using buried pipes generally suffers from defects such as poor adaptability of buried pipe parameters, low synergy between deep and shallow heat exchange, uneven flow in the pipe network, easy accumulation of hot and cold soil, easy leakage at pipe joints, and high difficulty in pipe network inspection and maintenance. After long-term operation, problems such as decreased system heat exchange efficiency, increased operating energy consumption, and high equipment failure rate will occur, which seriously affect the stability and service life of the ground source heat pump system.

[0004] Developing a horizontal pipeline connection method for buried ground source heat pumps to solve core problems such as heat exchange short circuits, hydraulic imbalance, operation and maintenance difficulties, construction leakage, and poor compatibility between shallow and deep layers has become a technical challenge that urgently needs to be addressed by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a method for connecting horizontal pipes of a buried ground source heat pump, thereby solving the problems listed in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention discloses a method for connecting horizontal pipes of a buried ground source heat pump, comprising the following steps: S1. Precise pipe laying parameter calibration for deep and shallow layers: Based on the soil structure, geothermal temperature, soil thermal conductivity and building heating and cooling load requirements at the construction site, the shallow heat exchange zone and the deep heat exchange zone are divided, and the pipe laying depth, pipe spacing, laying slope and heat exchange pipeline specifications of different areas are calibrated to form a precise pipe laying parameter database. S2. Layered staggered heat insulation pipe laying construction: Based on the calibration parameters, the horizontal supply and return water pipes are laid out in layers and staggered layers. The shallow pipes and deep pipes are vertically staggered and horizontally offset. The layers and pipes are filled with heat insulation buffer filler. S3, Layered and staggered soil temperature field monitoring unit: Distributed temperature sensor array based on the burial depth of the pipeline in the soil layer; S4. Parallel and balanced pipe network: All deep and shallow heat exchange branches are connected in parallel using a parallel structure, and are also connected to the solar heating pipeline to avoid cold accumulation. S5. Independent segmented maintenance-friendly layout: The overall horizontal pipe network is divided into several independent heat exchange pipe segments, and each pipe segment is independently equipped with control valves, detection interfaces and pressure relief structures. S6. Modular Sealed Pipe Connection Construction: All pipe interfaces adopt a standardized modular sealed connection structure, achieving precise connection through positioning snap-fit, double-layer sealing, and coaxial limiting structure.

[0007] Preferably, the S1 method for precise pipe laying control with shallow and deep layer adaptation specifically includes: controlling the shallow pipe laying depth to 1.5-3m based on the soil thermal stratification characteristics to adapt to seasonal heating and cooling load adjustments; controlling the deep pipe laying depth to 3-6m to adapt to the constant heat exchange load of the foundation; dynamically adjusting the pipe spacing according to the soil thermal conductivity: when the thermal conductivity is ≥1.8W / (m·K), the pipe spacing is ≥1.2m; when the thermal conductivity is <1.8W / (m·K), the pipe spacing is ≥0.8m, while controlling the pipe laying slope to 0.2%-0.5%.

[0008] Preferably, the S2 layered staggered thermal insulation pipe laying process specifically includes: four layers of pipes, namely shallow water supply pipe, shallow water return pipe, deep water supply pipe, and deep water return pipe, are laid out in pairs with vertical staggered layers and horizontal staggered layers, with a vertical layer spacing of not less than 0.6m and a horizontal staggered offset distance of not less than 0.5m; the layers are filled and isolated by polyurethane thermal insulation board, and the gaps between the pipes are filled with a mixture of fine sand and thermal insulation filler.

[0009] Preferably, the S3, the layered and staggered soil temperature field monitoring unit, specifically includes: deploying temperature sensors at different depths of the soil layer according to the location of the pipeline to monitor the temperature of the soil layer, so that the temperature fluctuation of the soil layer is within a preset range, and avoiding cold or hot accumulation in the soil layer due to excessive heat exchange.

[0010] Preferably, the S4 parallel balanced pipe layout method specifically includes: the inlet and outlet of all deep and shallow heat exchange branches are connected to the main distributor and main collector respectively, and the total length, number of bends, and pipe resistance of each branch from the distributor to the collector are completely consistent; a symmetrical parallel layout structure is adopted to eliminate the resistance difference of the cross-connection, and with the branch fine-tuning valve, the water flow deviation of each branch is ≤±5%, the heat exchange temperature deviation is ≤±2℃, and the solar heating pipeline is connected to heat or cool the soil layer, so as to intervene in the temperature range of the soil layer in a timely manner and avoid the accumulation of cold or hot soil.

[0011] Preferably, the S5 independent segmented maintenance-friendly layout process specifically includes: dividing the horizontal pipe network into several independent segmented units according to the heat exchange area, each segmented unit containing complete deep and shallow heat exchange pipelines, and each segmented unit is equipped with an independent manual control valve, pressure detection interface, temperature monitoring interface and pressure relief valve at both ends; when any single segmented pipeline is under maintenance, the corresponding segment valve can be shut off separately without affecting the normal operation of the other segmented pipelines, realizing non-stop operation and maintenance, accurate fault location and rapid maintenance and replacement.

[0012] Preferably, the S6 modular sealing and connecting pipe construction specifically includes: setting an integrated modular joint at the pipe connection end, with the joint having a built-in coaxial positioning and limiting structure, double-layer rubber sealing gaskets and locking clamps; during connection, the positioning structure achieves precise coaxial connection of the pipes, with the connection error controlled within ±0.3mm; the double-layer sealing structure achieves end face sealing and side wall sealing respectively; the locking clamps are mechanically fixed, and combined with the pressure testing and leak detection process, the pipe joint leakage problem is eliminated, improving installation accuracy and construction efficiency.

[0013] Compared with the prior art, the beneficial technical effects of the present invention are as follows: 1) This invention adopts a deep and shallow layer zoning precise pipe laying parameter calibration process, combined with soil thermal conductivity, soil layer characteristics and building heating and cooling load dynamic matching construction parameters to achieve layered adaptive heat exchange, taking into account both seasonal load adjustment and the constant heat exchange requirements of the foundation, thereby improving the heat exchange adaptability of the system from the source. 2) The layered staggered insulation pipe structure, combined with the interlayer and pipe-to-layer insulation filling, eliminates the problem of heat crosstalk and heat exchange cancellation between cold and hot pipes, and greatly improves the heat exchange efficiency per unit pipe. 3) Equipped with a comprehensive three-dimensional temperature field monitoring system, which can monitor changes in the underground soil temperature field in real time, provide early warning of potential cold and heat accumulation hazards, and provide data support for precise system control; 4) By adopting a parallel network configuration, the problem of uneven flow and heat exchange in traditional cross-flow pipelines is completely solved. Combined with a solar-assisted temperature control system, the underground soil temperature is effectively balanced, and the problem of heat exchange attenuation during long-term operation is eliminated. 5) The independent segmented modular layout structure enables uninterrupted operation and maintenance of the pipeline network, accurate fault location, and independent segmented maintenance, which greatly reduces system operation and maintenance costs and downtime losses. 6) It adopts a modular pipe connection structure with double-layer sealing and coaxial limiting, which has high connection accuracy and good sealing performance, completely solving the problem of pipe interface leakage. The construction is highly standardized and modular, making it suitable for large-scale engineering promotion and application.

[0014] In summary, this invention provides a method for connecting horizontal pipelines of a buried ground source heat pump. Through six core processes—precise calibration of shallow and deep parameters, layered and staggered insulated pipe layout, full-area temperature field monitoring, parallel and balanced network construction, independent segmented maintenance-friendly layout, and modular sealing connection—it achieves refined, standardized, and modular construction of the horizontal pipeline network for ground source heat pumps. This method effectively balances the heat exchange conditions of the pipeline network, prevents the accumulation of hot and cold soil, improves the sealing stability of the pipeline, reduces operation and maintenance costs, and is suitable for various building ground source heat pump system construction scenarios. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a flowchart of a method for connecting horizontal pipes of a buried ground source heat pump according to the present invention. Detailed Implementation

[0017] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] like Figure 1 As shown, a method for connecting a horizontal pipeline of a buried ground source heat pump includes the following steps: S1. Precise pipe laying parameter calibration for deep and shallow layers: Based on the soil structure, geothermal temperature, soil thermal conductivity and building heating and cooling load requirements at the construction site, the shallow heat exchange zone and the deep heat exchange zone are divided, and the pipe laying depth, pipe spacing, laying slope and heat exchange pipeline specifications of different areas are calibrated to form a precise pipe laying parameter database. S2. Layered staggered heat insulation pipe laying construction: Based on the calibration parameters, the horizontal supply and return water pipes are laid out in layers and staggered layers. The shallow pipes and deep pipes are vertically staggered and horizontally offset. The layers and pipes are filled with heat insulation buffer filler. S3, Layered and staggered soil temperature field monitoring unit: Distributed temperature sensor array based on the burial depth of the pipeline in the soil layer; S4. Parallel and balanced pipe network: All deep and shallow heat exchange branches are connected in parallel using a parallel structure, and are also connected to the solar heating pipeline to avoid cold accumulation. S5. Independent segmented maintenance-friendly layout: The overall horizontal pipe network is divided into several independent heat exchange pipe segments, and each pipe segment is independently equipped with control valves, detection interfaces and pressure relief structures. S6. Modular Sealed Pipe Connection Construction: All pipe interfaces adopt a standardized modular sealed connection structure, achieving precise connection through positioning snap-fit, double-layer sealing, and coaxial limiting structure.

[0019] Specifically, the S1 deep-shallow layer adaptation precision buried pipe control method includes: based on the soil thermal stratification characteristics, the shallow buried pipe depth is controlled at 1.5-3m, utilizing the seasonal temperature fluctuation characteristics of shallow soil to adapt to the seasonal cooling and heating load adjustment needs of buildings in summer and winter, with fast response speed and strong heat exchange flexibility; the deep buried pipe depth is controlled at 3-6m, relying on the constant temperature and good thermal stability of deep soil to adapt to the constant heat exchange load of the building foundation throughout the year, ensuring the heat exchange capacity of the system foundation; the pipe spacing is dynamically adjusted according to the soil thermal conductivity, with a pipe spacing ≥1.2m when the thermal conductivity is ≥1.8W / (m·K) and a pipe spacing ≥0.8m when the thermal conductivity is <1.8W / (m·K), while controlling the pipe laying slope to 0.2%-0.5% to ensure smooth drainage and ventilation in the pipes, avoiding water and air accumulation in the pipes that affect heat exchange efficiency and pipe corrosion.

[0020] Specifically, the S2 layered staggered heat insulation pipe laying process includes: four layers of pipes—shallow water supply pipe, shallow water return pipe, deep water supply pipe, and deep water return pipe—arranged in pairs with vertical staggered layers and horizontal staggered positions. The vertical layer spacing is not less than 0.6m, and the horizontal staggered offset distance is not less than 0.5m, which completely separates the heat exchange areas of the cold and hot pipes and eliminates thermal crosstalk between the supply and return water pipes. The layers are filled and isolated with polyurethane heat insulation boards, which have excellent heat insulation performance and can effectively block radial heat transfer between the upper and lower pipes. The soil gaps between the pipes are filled and compacted with a mixture of fine sand and nano heat insulation filler. The filling layer has uniform density, which can not only fix the pipe position and prevent pipe settlement and displacement, but also weaken the lateral thermal interference between pipes, ensuring that each heat exchange pipe can independently and fully exchange heat with the surrounding soil layer.

[0021] Specifically, the S3 layered and staggered soil temperature field monitoring unit includes: temperature sensors are deployed at different depths of the soil layer according to the location of the pipeline. The sensors accurately correspond to the heat exchange pipelines of each layer, and the soil temperature data of different depths and areas are collected in real time by layer and zone, so as to realize the 24-hour uninterrupted dynamic monitoring of the underground heat exchange temperature field and avoid the accumulation of cold or hot soil due to excessive heat exchange.

[0022] Specifically, the S4 parallel balanced pipe layout method includes: the inlet and outlet of all deep and shallow heat exchange branches are connected to the main distributor and main collector respectively, and the total length, number of bends, and pipe resistance of each branch from the distributor to the collector are completely consistent; a symmetrical parallel layout structure is adopted to eliminate the resistance difference of the cross-connection, and with the branch fine-tuning valve, the flow rate deviation of each branch is ≤±5%, and the heat exchange temperature deviation is ≤±2℃. By reserving the connection port of the solar heating pipeline, the solar auxiliary system can be activated in a timely manner according to the monitoring data of the underground soil temperature field to heat the low temperature soil layer and assist in cooling the high temperature soil layer, actively intervene in the soil temperature change, balance the underground cold and heat exchange difference, and completely solve the problem of soil cold and heat accumulation and system heat exchange attenuation caused by long-term operation.

[0023] Specifically, the S5 independent segmented maintenance-friendly layout process includes: dividing the horizontal pipe network into several independent segmented units according to the heat exchange area. Each segmented unit contains complete deep and shallow heat exchange pipelines. Each segment is equipped with an independent manual control valve, pressure detection interface, temperature monitoring interface, and pressure relief valve at both ends. When any single segment of the pipeline is under maintenance, the corresponding segment valve can be shut off independently without affecting the normal operation of the remaining segments of the pipeline network, thus achieving non-stop operation and maintenance, accurate fault location, and rapid maintenance and replacement. When a certain pipe section experiences problems such as abnormal pressure, excessive temperature, pipeline failure, or decreased heat exchange efficiency, the control valve of the corresponding section can be shut down individually to perform pressure relief, inspection, repair, or replacement work on that section of the pipeline. The entire process does not shut down the main system or affect the normal heat exchange operation of other pipe sections, significantly reducing system operation and maintenance downtime costs. At the same time, the fault location can be quickly located through the independent monitoring interface of each section, improving operation and maintenance efficiency and system stability.

[0024] Specifically, the S6 modular sealing and connecting pipe construction includes: setting an integrated modular joint at the pipe connection end, with the joint containing a coaxial positioning and limiting structure, double-layer rubber sealing gaskets, and locking clamps; during connection, the positioning structure achieves precise coaxial connection of the pipes, with the connection error controlled within ±0.3mm, effectively avoiding sealing failure caused by pipe misalignment or offset. The double-layer rubber sealing gaskets achieve axial sealing of the pipe end face and radial sealing of the pipe sidewall, respectively, constructing a double-sealed anti-seepage structure to completely block the medium leakage channel; after precise connection, mechanical locking and fixing are performed using locking clamps to ensure that the joint connection structure is firm and free from loosening or displacement. After the connection construction is completed, a segmented pressure testing process is carried out simultaneously, with pressure testing performed on each connection interface to identify potential minor leaks, comprehensively ensuring the sealing performance of the pipe interfaces, significantly improving pipe installation accuracy and construction efficiency, and extending the overall service life of the pipeline network.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for connecting horizontal pipes of a buried ground source heat pump, characterized in that: Includes the following steps: S1. Precise pipe laying parameter calibration for deep and shallow layers: Based on the soil structure, geothermal temperature, soil thermal conductivity and building heating and cooling load requirements at the construction site, the shallow heat exchange zone and the deep heat exchange zone are divided, and the pipe laying depth, pipe spacing, laying slope and heat exchange pipeline specifications of different areas are calibrated to form a precise pipe laying parameter database. S2. Layered staggered heat insulation pipe laying construction: Based on the calibration parameters, the horizontal supply and return water pipes are laid out in layers and staggered layers. The shallow pipes and deep pipes are vertically staggered and horizontally offset. The layers and pipes are filled with heat insulation buffer filler. S3, Layered and staggered soil temperature field monitoring unit: Distributed temperature sensor array based on the burial depth of the pipeline in the soil layer; S4. Parallel and balanced pipe network: All deep and shallow heat exchange branches are connected in parallel using a parallel structure, and are also connected to the solar heating pipeline to avoid cold accumulation. S5. Independent segmented maintenance-friendly layout: The overall horizontal pipe network is divided into several independent heat exchange pipe segments, and each pipe segment is independently equipped with control valves, detection interfaces and pressure relief structures. S6. Modular Sealed Pipe Connection Construction: All pipe interfaces adopt a standardized modular sealed connection structure, achieving precise connection through positioning snap-fit, double-layer sealing, and coaxial limiting structure.

2. The method for connecting horizontal pipes of a buried ground source heat pump according to claim 1, characterized in that: The S1 deep-shallow layer adaptation precision pipe laying control method specifically includes: based on the soil thermal stratification characteristics, the shallow layer pipe laying depth is controlled at 1.5-3m to adapt to seasonal cold and heat load adjustments; the deep layer pipe laying depth is controlled at 3-6m to adapt to the constant heat exchange load of the foundation; the pipe spacing is dynamically adjusted according to the soil thermal conductivity, with a pipe spacing ≥1.2m when the thermal conductivity is ≥1.8W / (m·K) and a pipe spacing ≥0.8m when the thermal conductivity is <1.8W / (m·K), while controlling the pipe laying slope to 0.2%-0.5%.

3. The method for connecting horizontal pipes of a buried ground source heat pump according to claim 1, characterized in that: The S2 layered staggered thermal insulation pipe laying process specifically includes: four layers of pipes, namely shallow water supply pipe, shallow water return pipe, deep water supply pipe, and deep water return pipe, are laid out in pairs with vertical staggered layers and horizontal staggered layers, with a vertical layer spacing of not less than 0.6m and a horizontal staggered offset distance of not less than 0.5m; the layers are filled and isolated by polyurethane thermal insulation board, and the gaps between the pipes are filled with a mixture of fine sand and thermal insulation filler.

4. The method for connecting horizontal pipes of a buried ground source heat pump according to claim 1, characterized in that: The S3, layered and staggered soil temperature field monitoring unit specifically includes: deploying temperature sensors at different depths of the soil layer according to the location of the pipeline to monitor the temperature of the soil layer, so that the temperature fluctuation of the soil layer is within a preset range, and to avoid the accumulation of cold or hot soil due to excessive heat exchange.

5. A method for connecting horizontal pipes of a buried ground source heat pump according to claim 1, characterized in that: The S4 parallel balanced pipe layout method specifically includes: the inlet and outlet of all deep and shallow heat exchange branches are connected to the main distributor and main collector respectively, and the total length, number of bends, and pipe resistance of each branch from the distributor to the collector are completely consistent; a symmetrical parallel layout structure is adopted to eliminate the resistance difference of the cross-connection, and with the branch fine-tuning valve, the water flow deviation of each branch is ≤±5%, the heat exchange temperature deviation is ≤±2℃, and the solar heating pipeline is connected to heat or cool the soil layer, so as to intervene in the temperature range of the soil layer in a timely manner and avoid the accumulation of cold or hot soil.

6. A method for connecting horizontal pipes of a buried ground source heat pump according to claim 1, characterized in that: The S5 independent segmented maintenance-friendly layout process specifically includes: dividing the horizontal pipe network into several independent segmented units according to the heat exchange area. Each segmented unit contains complete deep and shallow heat exchange pipelines. Each segment is equipped with an independent manual control valve, pressure detection interface, temperature monitoring interface, and pressure relief valve at both ends. When any single segment of the pipeline is under maintenance, the corresponding segment valve can be shut off independently without affecting the normal operation of the remaining segments of the pipeline network, thus achieving non-stop operation and maintenance, accurate fault location, and rapid maintenance and replacement.

7. A method for connecting horizontal pipes of a buried ground source heat pump according to claim 1, characterized in that: The construction of the S6 modular sealing and connecting pipe includes: setting an integrated modular joint at the pipe connection end, with the joint having a built-in coaxial positioning and limiting structure, double-layer rubber sealing gaskets and locking clamps; during connection, the positioning structure achieves precise coaxial connection of the pipes, with the connection error controlled within ±0.3mm; the double-layer sealing structure achieves end face sealing and side wall sealing respectively; the locking clamps are mechanically fixed, and with the pressure testing and leak detection process, leakage problems at the pipe joints are eliminated, improving installation accuracy and construction efficiency.

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