The Study of Adding Heat Insulation Baffle on the Heat Transfer Performance of the Vertical U-shaped Ground Tube Heat Exchanger

Vertical single U-shaped ground tube is presented in this paper based on the research of the three-dimensional heat transfer model, using the numerical simulation method to study Nanjing area in summer conditions ground heat exchanger. Under the condition of not adding insulation board, comparing the influence of different inlet velocity on the heat exchanger, and then compared the adding different length of insulation surface heat exchanger heat transfer capacity, the influence of the comparative analysis of the results show that the inlet velocity under different operating conditions and the influence on the buried pipe outlet temperature and heat transfer, adding heat shield does not necessarily slow down the hot short circuit, so the heat exchanger, heat transfer performance and fuel economy must be considered to choose the best length of insulation board.