Selection of pipe diameter for ground-source heat pump system

Analyses the influence of pipe diameter on the energy consumption of the water pump and the ground heat exchanger performance in detail. Selects five kinds of different pipe diameter to analyse on the condition of the constant water flow in pipe. The results show that an appropriate increase in pipe diameter can reduce the frictional resistance caused by water flowing in pipe, and reduce the energy consumption of the water pump; a decrease in pipe diameter can enhance the convection heat transfer between the circulating water and the pipe wall. A comprehensive consideration should be given to determining an optimal pipe diameter.