Heat transfer performance and temperature field of soil around horizontal buried heat exchangers for ground-coupled heat pump system

Presents a new two-dimension model, solved by the boundary discrimination and conformal mapping methods, and compiles the calculating software by Microsoft Visual Basic language. By the model and software, simulates the temperature field and the heat flow distribution for horizontal buried pipes of the heat exchanger for the GSHP in winter and summer conditions. The temperature field around the pipe shows a single-peak asymmetrical profile on vertical plant and a single-peak symmetrical profile on horizontal plant in winter condition, and shows a single-hollow asymmetrical profile on vertical plant and a single-hollow symmetrical profile on horizontal plant in summer condition. The soil temperature varies slightly increasingly away from the buried pipes. The temperature for the outer surface of the pipe and for the concentric circle with the pipe all show sine profile. The heat flow is higher through the top units of the pipe than that through the bottom units. The results agree with the data in the experiments reported by Chongqing University, and the residual error is 6.2％.