| Continuable development have already become the consensus of the common and the direction of social development in all countries for 21 centuries, the energy crisis is decisive factor that restrict the continuable development. The subterranean heat resources have already got the very extensive application in HVAC and hot water supplying, ground-source heat pump system is an important application among them. Heating exchange of ground heat exchanger is the most important aspect of ground-source heat pump system, directly affect its performance.This text uses the method of numerical simulation to study the heat exchange of U-tube. Using the GAMBIT software establishment 3D model of U-tube and the surroundings soils ,carry on the numerical simulation with the large business CFD software FLUENT, using its handle function analysis the result, throughing the experiment validate the accuracy of the model. Simulating the U-tube heat exchange under winter and summer continuously work condition of three months , getting the heat exchange value at each time and total variety trends, providing the referrence to engineering design. Analysing the temperature distribute of ground in three dimension and the heat exchange resistance, getting some measures that enhance heat exchange.Getting the influencing effect to heat flux by different factors through numerical simulating, such as the depth of well, the inlet temperature and velocity of flow, the center space and material of U-tubes and the properties of soil and backfill ,the heat exchange can be optimized through the conclusion, and the engineering designs can be guided also.
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