Exergy Analysis of a Ground Source Heat Pump System Under Cooling and Heating Conditions

摘要

Energy and exergy analyses models were established to evaluate the performance of a ground source heat pump (GSHP) based on the energy conservation and the exergy destruction principles. The GSHP supplies cooling water and hot water to the air handling unit of a building air-conditioning system in cooling and heating season, respectively. It rejects and absorbs heat from the soil through borehole heat exchangers accordingly. The models were programmed and the properties of the working mediums were calculated by calling the software REFPROP. Results indicate that GSHP system operates at higher exergy efficiency in heating mode. The exergy efficiencies of the whole system are 23.07 and 34.31 % in cooling and heating modes, respectively. And the performances of every component are evaluated.