Operation Analyse of a U-tube Ground Heat Exchangers of GSHP System in Cold Region of China☆

Abstract The objective of this study is to discuss summer operation performance of a large Ground Source Heat Pump System (GSHP) for a NZEB office building in cold region of Beijing, China. Borehole performance under different field distribution and its impact to the surrounding soil at different depth is monitored and analysed. It is found that double U-tube has approximately 1.3 times heat releasing amount than the single tube and soil temperature raised by up to 1.4°C after 2.5 months’ cooling operation. The operational data is of great value to understand and further optimize the operation strategy. It is believed that better system performance could be achieved with the completion of system commissioning and integration of building automation.