Inaugural US-EU-China Thermophysics Conference-Renewable Energy 2009 (UECTC 2009 Proceedings)
61 Theoretical and Experimental Investigation of Ground Source Co2 Heat Pump and Air Conditioning Systems
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Increased concern about the environmental impact of refrigeration systems is leading toward improved energy efficiencies of such systems with ozone-friendly refrigerant with the least possible global warming potential. Carbon dioxide is one of the most promising refrigerants attaching great interest in industrial and scientific fields. However, the coefficient of performance of air-source CO2 heat pumps (ASHP) decreases with decreasing outdoor temperature while that of air conditioning systems decreases with increasing outdoor temperature. Ground energy is a clean, renewable source with a higher temperature than the air and the advantage of a more stable temperature range. This paper describes a...