Ground heat exchanger ground-source heat pump (GSHP) system, which has been identified as the most efficient and environment-friendly heating and cooling systems, is one of leading technologies of international HVAC industry. To perfect heat-transfer model for ground heat exchanger is one of key problems about GSHP popularized and applied, so actual thermal behavior of ground heat exchanger can be credibly simulated. This paper summarizes the current research situation of GSHP oversea and home and provides ...