摘要：Investigations of the heat acquisition from vertical ground heat exchangers were performed. From April to September 9.242 GJ of heat from ground boreholes have been obtained and the heat pump processing achieved 23.107 GJ of total heat used in the heating system. Coefficient of performance (COP) was 2.504 in spring and 1.981 in summer and compared to the heating period (winter) was 26.4 per cent lower with a COP of 3.05. The reason for reduction of the COP was probably high air temperatures in spring and summer (as confirmed by the correlation coefficient r = -0.178 in spring and r = -0.559 in summer).
