G0800305 Heat Exchange Performance of Ground Source Heat Pump That Use Direct Expansion Method : Influence of air temperature change to heat exchange performance of cooling mode

Abstract

The ground source heat pump is one of the energy-saving equipment. The performance of the ground source heat pump (GSHP) system is better than the general air heat pump system. The ground source heat pump using direct expansion method has higher performance than the ground source heat pump using indirect heat exchange method. It is also expected to be practical since it can reduce initial costs. The geothermal heat exchangers consist of the heat collecting pipes that exchanges heat from the ground. The direct GSHP system had experimentally demonstrated in cooling mode. The result indicates that the performance is influenced by outside air temperature but the value of COP keeps around 10 which is much larger than that of air heat pump systems.