Study on rock-soil thermal conductivity coefficient and heat transfer capacity in north area of China

The rock-soil thermal conductivity coefficient is an important design parameter for borehole heat exchanger of ground source heat pump(GSHP) system,and the heat exchange of unit borehole depth could provide a reference for the design of GSHP.The grasp of rock-soil thermal properties and heat transfer capacity are the prerequisite for stable and efficient operation of the GSHP system.An in-situ measurement method of the rock-soil thermal conductivity and heat transfer capacity was constructed combined with a GSHP actual project in Shenyang hunnan high-tech development zone,and then the rock-soil thermal conductivity and heat exchange of unit borehole depth were analyzed.The results show that the area has a better heat capacity and suitable for GSHP system.Moreover,geological condition of the region plan to build should be explored comprehensively before the design of GSHP system,which could make the preference of project zone and provide the guarantees for test reliability.