Case analysis of soil temperature field during operation of ground-source heat pump systems

Analyses the test data of the soil temperature field during the long-term operation of a practical ground-source heat pump (GSHP) system, and summarizes the change characteristics of soil temperature field and the influencing factors under different operation conditions of winter, summer and transitional seasons. Points out that the underground energy accumulation is a long-term effect for the operation of GSHP systems. It is important to record and analyse the long-term tendency of the soil temperature field changing, which is useful to make a rational adjustment on the operation mode of GSHP systems and guarantee a better reliability and energy efficiency.