| Ground source heat pump is a kind of emerging technolog with the global energy crisis, the emergence of environmental issues. Ground source heat pump only get heat from underground, don’t get water from underground, so do not cause problem of water pollution and recharge issues, it’s a new technology of energy saving and nvironmental protection. Heat exchanger performance of underground pipe is the main factor in performance of ground source heat pump.U-pipe and multiple well is the research object of this paper, study heat exchanger efficiency of underground U-pipe and the effects on soil temperature. Building three-dimensional U-pipe model through FLUENT software to numerical simulate, research the change of underground U-pipe outlet temperature and the amount of heat exchange of unit depth well as time change, and Ground source heat pump long-term operation impact on soil temperature field; Numerical simulate through change model and variable operation conditions, including study the change of underground pipe outlet temperature and the amount of heat exchange through change flow rate, tube well depth, physical parameters of filling materials, pipe spacing, single-U double-U and other conditions; Optimize the pipe system, get the best solution; Soil boundary is set to the symmetry plane, create a3×3array of nine tubes model, finding the regular of soil temperature change pattern when pipe space in different distances(3m,4m,5m); Design a set of ground source heat pump system, simulate the summer cooling conditions, over-season, winter heating conditions and over-season, in order to research the change of soil temperature field and soil temperature recovery in a cycle; further from simulate a cycle running from winter, compared to running from summer and running from winter soil temperature changes and recovery. Shows that ground source heat pump system can be highly efficient and stable long-run in the areas that cold in the winter and hot in the summer. |
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