Abstract
Thermal conductivity is one of the key factors influence the heat exchange performance of Ground-coupled heat pump systems (GCHP), which is effected significantly by soil moisture content around the ground heat exchanger system. The clay thermal conductivity under moisture content of 0, 5%, 10%, 15%, 20%, 25% and 30% were determined through thermal conductivity probe experiment. The results showed a variation with three phases of the thermal conductivity changes with clay moisture content, that firstly, the thermal conductivity increased slowly with a moisture content of 0~5%, secondly, which sharply increased with a high positive linear correlation when the moisture content was 5%~25%, then the growth tendency was slow even began to fall, as well as the correlation equation of the second phase was fitted. This study provides methodological and theoretical references for the further research on the influence factors of thermal conductivity under various situations.
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