The influence of the ground coupled heat pump's labor on the ground temperature in the boreholes - Study based on experimental data

摘要

The paper presents the results of observations made during whole year monitoring of the temperature of the 78 m deep boreholes. The boreholes serve as lower heat source for ground coupled heat pump used as one of heating sources in Energy Technology Center in Swidnica (Poland). Two of those boreholes were regenerated during warm season by free-cooling system and heat from solar collectors. It has been observed that the boreholes temperature changes along with the outdoor temperature changes during heat pump labor. During the heating season the heat source has cooled down by 0.3-1.1 K in comparison to the starting point. The temperature of non-regenerated borehole was lower by 0.4 K in the beginning of the next heating season in comparison to the former one. The temperature of borehole regenerated by free-cooling (63% of returned energy) has been kept the same, and the temperature of borehole regenerated by solar collectors (99% of returned energy) has risen by 0.2 K in comparison to the point before former heating season. (C) 2015 Elsevier Ltd. All rights reserved.