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Arrangement Strategy of ground heat exchanger with groundwater

Transactions of Tianjin University 2012年第4期18卷 291-297页

作者：李太禄朱家玲张伟 Key Laboratory of Efficient Utilization of Low and Medium Grade Energy of Ministry of Education Tianjin University School of Mechanical Engineering Tianjin University

The orientation strategy of side pipe and the heat transfer performance of six ground heat exchangers(GHEs) were optimized by numerical simulation,with soil being treated as a porous *** experiment on the heat transfer of four GHEs was carried out in *** indicate that the velocity field is disturbed by *** optimal orientation strategy of side pipe is that the upward pipe is located upstream and the downward pipe *** space between GHEs should be appropriately adjusted,depending on the direction and flow *** of GHEs should be installed perpendicular to the mainstream in a single row,but if the acreage does not meet the requirements,GHEs should be installed in staggered multiple *** GHEs parallel to the mainstream strengthen the heat ***,numerical results agree well with the test data,with the maximum relative error being less than 7.7%.

关键词： ground source heat pump ground heat exchanger groundwater geothermics

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Research on ground heat exchanger of ground Source heat Pump technique

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Journal of Geoscientific Research in Northeast Asia 2004年第2期7卷 196-199页

作者： LIUDong-sheng SUNYou-hong GAOKe WUXiao-hang CollegeofConstructionEngineering JilinUniversityChangchun130026JilinChina

ground Source heat Pump technique and its operating principle are described in this paper. ground heat exchanger is the key technique of ground source heat pump and its patterns are discussed. Software is helpful to design ground heat exchanger. A project of Chinese ground Source heat Pump is introduced and its market is more and more extensive.

关键词： ground Source heat Pump ground heat exchanger software design

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Experimental Verification to Estimate ground Thermal Conductivity Using Spiral Coil Type ground heat exchangers

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Journal of Civil Engineering and Architecture 2014年第4期8卷 425-429页

作者： Seok Yoon Min Jun Kim Gyu Hyun Go Seung Rae Lee Department of Civil and Environmental Engineering Korean Advanced Institute of Science and Technology (KA1ST) Daejeon305-701 South Korea

This paper presents an experimental study on the evaluation of thermal response of a spiral coil type GHE （ground heat exchanger）. This GHE was installed on partially saturated landfill ground that was composed of silt and clay in the runway area of Incheon International airport. TRT （thermal response test） was conducted for more than 65 hours under continuous operation conditions. ground thermal conductivity was derived based on line source theory, which has usually been found to be appropriate for line type GHEs such as U, W and 2U types. A reasonable method to derive ground thermal conductivity using the infinite line source theory for a spiral coil type GHE was introduced. ground thermal conductivity from the TRT using spiral coil type GHE was compared with those from the analytical equivalent model of ground thermal conductivity.

关键词： ground thermal conductivity ground heat exchanger thermal response test spiral coil.

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Measurement investigation on the feasibility of shallow geothermal energy for heating and cooling applied in agricultural greenhouses of Shouguang City: ground temperature profiles and geothermal potential

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Information Processing in Agriculture 2021年第2期8卷 251-269页

作者： Anh Tuan Le Liang Wang Yang Wang Daoliang Li National Innovation Center for Digital Fishery China Agricultural UniversityBeijing 100083China Beijing Engineering and Technology Research Centre for Internet of Things in Agriculture Beijing 100083China Key Laboratory of Agricultural Information Acquisition Technology Ministry of AgricultureBeijing 100083China College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China Department of Electronics Nam Dinh University of Technology EducationNam Dinh 07000Viet Nam

The use of electrical energy for heating and cooling systems to control the temperature in greenhouses will lead to high production and product *** solve this problem,shallow geothermal energy as a local source of energy could be *** this study,a measurement model,the distribution profiles of temperature,and a preliminary assessment of the geothermal potential in the shallow zone at depths of 0.1 m to 3.6 m in Shouguang City,Shandong Province,eastern China were *** measurement results showed that the annual average temperature at depths of 0.1–3.6 m ranged from 13.1℃ to 17.6℃.Preliminary assessment results of the geothermal potential showed that the daily average temperature difference between the air and at depths of 1.5–3.6 m was mainly from 10℃ to 25℃ during the winter months and between-15℃ and-5℃ during the summer ***,the heating systems could operate during January,February,November,and *** May,June,and July,the cooling systems could be ***,the measurement model gave good stability results,and it could be used in combination with the monitoring of the groundwater table,a survey of the thermal conductivity of the soil,climate change studies,which helps reduce unnecessary time and costs.

关键词： ground temperature profile Geothermal energy ground heat exchanger Measurement model Shouguang

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Application of the ground cooling system for rural houses air conditioning in northeastern China

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International Journal of Agricultural and Biological Engineering 2022年第2期15卷 230-235页

作者： Moon Ki Jang College of Information&Electric Engineering Shenyang Agricultural UniversityShenyang 110161China

This study developed an appropriate ground cooling system that can be used for indoor cooling during summers in rural houses in northeastern *** apply this system,a traditional rural house was selected and a heat exchanger was designed(PE pipe,32 m in length),manufactured,and installed according to the cooling load(2206 kJ/h)of one room of the experimental *** to the experiment,the temperature of Room 1 equipped with the cooling system was 3℃ lower than that of Room 2 without the ground cooling system during the same time *** temperature reduction effect of this system was confirmed through this *** the ground cooling system was used in rural houses in Northeast China,it was found that a burial depth of 1.5-2.0 m for the ground heat exchanger is appropriate for considering workability and frost *** use of the ground cooling system for indoor cooling during summers for rural houses in the northeastern region of China would reduce not only environmental pollution and the use of fossil fuels but also ease farmers off a certain amount of financial burden.

关键词： ground cooling system ground heat exchanger air conditioning system rural houses

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Field evaluation of a ground-coupled heat pump in hot-summer and cold-winter regions

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Journal of Chongqing University 2011年第4期10卷 159-167页

作者：雷飞 School of Environmental Science and Engineering Huazhong University of Science and Technology

The experimental performance of small-sized ground-coupled heat pump (GCHP) is researched intensively. However, there are little data documenting the operation performance of existing large-sized GCHP system. We presented the actual performance measurement of a GCHP installed for apartment buildings in Wuhan, Hubei province, P. R. China. The system was constructed with a closed vertical typed ground heat exchanger with a total pipe length of 32 000 m. During one year, various operating parameters were monitored, including the outdoor temperature, the flow rate, the electrical consumption, and the water temperature. The seasonal coefficients of performances of the heat pumps and the system based on the measured data were found to be 4.01 and 2.96 in the cooling season, and 3.54 and 2.86 in the heating season, respectively. The GCHP system was more economical than the air-source room air conditioner in the energy efficiency which was increased by 29% in cooling mode and 50% in heating mode. There was an obvious heat imbalance of soil between the injection rate and the extraction rate in the residential GCHP system operation.

关键词： wound-coupled heat pump coefficient of performance ground heat exchanger field evaluation,

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The Influence of groundwater Seepage on ground heat Exchange

The Influence of Groundwater Seepage on Ground Heat Exchange

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第26届中国控制与决策会议

作者： Gangjie Yang Min Guo College of Electronic Information and Control Engineering Beijing University of Technology

In order to determine whether the groundwater seepage has an impact on the ground heat exchanger in thermal efficiency, a three-dimensional coupling thermal seepage model of the vertical u-tube ground heat exchanger was established. The standard- turbulence model was used inside the pipe and the porous media model was used outside the pipe. The heat transfer process was simulated by the FLUENT software in summer cooling condition. By the simulation results, the outlet temperature of the seepage model of heat exchanger is lower than the no-seepage model of heat exchanger, and with the seepage velocity increasing, the heat exchanger’s outlet temperature is lower, soil temperature field around the heat exchanger offset more serious. Therefore, the groundwater seepage of ground heat exchanger has certain influence in the thermal efficiency, the greater the seepage velocity, the higher the efficiency of heat exchanger. What’s more, the seepage direction will affect the distribution of the soil temperature field around the heat exchanger.

关键词： ground heat exchanger groundwater seepage Porous media Numerical simulation

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Modeling and Simulation of Four Boreholes heat Transfer And Intermittent Running

Modeling and Simulation of Four Boreholes Heat Transfer And ...

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第26届中国控制与决策会议

作者： Yating Zhang Quanwen Jiao College of Electronic Information and Control Engineering Beijing University of Technology

ISBN: (纸本)9781479937097

In order to simulate and analyze the soil temperature field of borehole groups in different working condition, a four boreholes vertical U-shaped pipe heat transfer model outside the boreholes in cylindrical coordinate is established. Using the Virtual heat Source and Green function method, based on g-function and the unsteady three-dimensional heat transfer model, the four boreholes model gives out a numerical simulation on the heat transfer process in the case that the soil is isotropic medium with MATLAB. Compared to the experiment the the accuracy of the model is verified. By the simulation results, intermittent running is beneficial to the recovery of soil temperature and small running ratio is better than large one.

关键词： ground heat exchanger Numerical simulation Intermittent running

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