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Simulation Study on the Performance of Solar and Geothermal Hybrid R22 Heat Pump

A simulation study on the performance of the solar and geothermal hybrid heat pump system by using R22 was carried out with a variation of operating conditions. The system was consisted of solar system (concentric evacuated tube solar collector, heat storage tank) and geothermal heat pump system (double pipe heat exchanger, electric expansion valve and compressor). As a result, the heating capacity is linearly decreased from 13.2 kW to 11 kW as the heat pump operating temperature increases from 40 o C to 48 o C. Besides, the heating COP decreases by 13.6% from 4.4 to 3.8 when the ground temperature raises 13 o C to 17 o C. The heating capacity is increased by 4.7% from 11.5 kW to 12.2 kW and the heating COP rises by 19% from 4.7 to 5.6.