Page No 282 – Performance analysis of ground source heat pump system with vertical borehole heat exchangers affected by rapid groundwater flow – 13th IEA Heat Pump Conference, Jeju, Korea
The objective of this study is to estimate a cooling and heating performance of the ground source heat pump system with the borehole heat exchangers affected by rapid groundwater flow. The performance prediction is especially performed according to the required length of the borehole heat exchangers. For the evaluation of the performance, the measured data are analyzed in a three-floor building installed on the ground source heat pump system with four borehole heat exchangers (BHE s) in Kazuno City, Japan where the area has the groundwater flow actively. Based on the thermal properties of the soil and the groundwater velocity analyzed by the thermal response test, the measured circulating fluid temperature corresponding with the building load is compared with the calculated circulating fluid. The calculated fluid temperature was in agreement with the measurement data when an effective thermal conductivity of soil and a groundwater velocity were 4.7 W/(m K) and 120 m/y. An average coefficient of performance in a cooling/heating period was 4.5 and 7.8 respectively.