earticle

영어

Ground-Source heat pump(GSHP) system uses geothermal energy to provide space cooling or heating. GSHP makes use of energy stores in ground as heat source or heat sink. It is more energy-efficient way of heating and cooling buildings. That is because ground temperature is lower than air temperature in summer time, and higher than air temperature in winter time. Moreover, ground temperature always keep stable during years. But, when the GSHP system runs long time, ground temperature will be changed. and the performance of the GSHP system will be affected. GSHP also can be used as domestic hot water(DHW) system. But the lower temperature of the heat source makes it difficult to get high temperature hot water. Therefore, a GSHP Cooling & DHW combination system was proposed in this study. In the proposed combination GSHP system the condensation heat from the condenser of GSHP cooling system is reused as the heat source of the DHW heat pump. Hence the drop in ground temperature caused by the long time operation of GSHP cooling system will be improved. In order to evaluate the performance of the combination GSHP system, mock-up experiments were conducted. as comparison, the performance of GSHP cooling-only system and GSHP DHW-only system in the same experimental conditions were evaluated too. As experimental results, the coefficient of performance(COP) of the cooling heat pump of the combination system is about 12.93% higher than GSHP cooling-only system, and the COP of the DHW heat pump of the bombination system is about 15.47% higher than GSHP DHW-only heat pump system.