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Ground source heat pump (GSHP) use the ground as both a sink and a source for thermal energy needed to heat and cool buildings. Thermal energy is transferred between the earth and the GSHP by fluids that circulate in "underground energy collector" which are made of polyethylene or steel pipes. We can take use of superficial geothermal energy more efficiently if we acknowledge the condition of underground temperature field. And we can lay the underground energy collector rationally to improve the efficiency of heat exchanging and decrease the inputting cost. The author built a test-bed to study the diversification of underground temperature field when the GSHP operate. We try to find out decent number of energy wells and optimal depth so as to increase the ratio of costing and producing. We believe the experiments are valuable to GSHP projects.
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