关键词: 单U 型管 , 地源热泵 , 数值分析 , 传热模型 , 温度场

Abstract: A single U-tube is the most common type of ground heat exchange in Ground Coupled Heat Pump(GCHP)system, and ground heat exchanger is an important component of the GCHP system. The real shape of U-tube was considered, and heat transfer model of underground vertical buried tube heat exchanger was built with math methods and numerical analysis software. The soil temperature distributions around the buried tube under different working conditions were solved by programming. The analysis shows that the thermal conductivity and specific heat of soil, the thermal conductivity of backfilled material in drilling and the distance between U-tubes have direct effect on the heat transfer performance of buried tubes. The results may provide guidance in the design of GCHP systems．

Key words: Single U-tube ,  Ground coupled heat pump ,  Numerical analysis ,  Heat transfer model ,  Temperature distribution