| The research was carried on the performance of the heat and moisture transfer and the earth energy performance, and the physical and mathematical model of underground field were set up. Different with traditional model, a number of factors, such as stratification of soil in the depth and soil heat and moisture movement were taken into account, and numerical simulation on the underground temperature and humidity field around the underground heat exchanger was carried out in the paper.Based on the analysis of the mechanics of heat and moisture transfer in soil, one dimension and transient model of heat and moisture transfer was established. The numerical simulation on the underground temperature and humidity field was carried out according to given boundary and initial condition. The influences of initial moisture content to soil property and the underground temperature field were analyzed. The stabilization and regeneration property of earth energy were verified.Based on the study of property of earth energy, three dimession and transient model of heat and moisture transfer in soil around the underground heat exchanger was established under double-cylindrical coordinate system. The influences of different soil property and initial moisture content and different operation mode to the underground temperature and humidity field around single borehole heat exchanger was analyzed. Compared with simulation result and measured value, the rationality of the model was verification.The three demission and transient simulation and analysis of a group of U-pipe underground heat exchangers under rectangular coordinate system were carried out and the compilation of calculation sofeware was accomplished. The influences of different form of boreholes arrangement and distance between two boreholes and different operation modes to the underground temperature and humidity field were studied. The results were useful for design and application of GSHP.
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