Heat Transfer Analysis Of Vertical U-tube Ground Heat Exchangers For Ground-source Heat Pump

This paper introduces the characteristics of the Ground-Source Heat pump and the prospects of developing it. On the basis of the V.C.Mei model of heat transfer and the combination of the conservation of energy equation and the heat transfer equation, the heat transfer model is set up through the comparison and contrast of the existing models. Due to the considerations of the fluid radial non-isothermal change in the well and multiple layers, this model accords with the fact of heat transfer.In comparison with the simiplified line-source model and the one-dimensional cylinder model, it demonstrates that this model can make well up the deficiency of them due to its solution in more accordance with the fact. It may be simply solved in manner of the finite unit method , which can be a reference of the theory research and the practical design.Meanwhile, this paper designs the heat-transfer test of the model. On a basis of the test data and its solution, it deduces the integrated convection heat-tansfer coefficient. Under the analysis of thermal coefficients and in comparison with the simiplified line-source model and the one-dimensional cylinder model, it demonstrates that this model can make well up the deficiency of them due to its solution in more accordance with the fact.The Ground-Source Heat pump is a fresh domain in china and has a promising developing.