Monitoring Systems for the Long-Term Performance Assessment of Geothermal Heat Pump Systems in KIGAM

Abstract

Three geothermal heat pump (GHP) systems were installed in recently constructed buildings in Korea institute of geoscience and mineral resources (KIGAM). The first GHP system and its monitoring system were installed in the A2 building, and they have operated and been monitored since 2006. This vertical closed-loop GHP system comprises 79 heat pumps, 4 fluid pumps, and 28 borehole heat exchangers (BHEs). The second GHP system installed in the A1 building have operated since 2015 and been monitored since 2017. This vertical closed-loop GHP system comprises 10 heat pumps, 5 fluid pumps, and 50 BHEs. Each BHE consists of a closed circuit with a single U-tube in a grouted borehole 200 m deep. The newest GHP system installed in the KIGAM SPOREX building is currently under construction and will be finished soon. This experimental hybrid open/closed-loop GHP system consists of two heat pumps, one circulation pump for the closed-loop system, one well pump for the open-loop system, and three boreholes without grout.