Performance analysis on a solar-powered air-cooled two-staged ejector refrigeration system with water as refrigerant for cold store

The performance was analyzed on a solar-powered air-cooled two-staged ejector refrigeration system using water as refrigerant with rated refrigeration capacity of 8.3 kW for cold store. The refrigeration capacity of the proposed system increases with the rising of cold storage temperature and enhancement of solar irradiance, while decreases with the rising of ambient temperature. The coefficient of performance (COP) has similar changing trend with that of the refrigeration capacity except that it increases rapidly with the enhancement of solar irradiance firstly and then become stable after solar irradiance exceeding a certain value. The refrigeration capacity is 5.6–20 kW and the COP 0.075–0.112 under the normal operating conditions with the cold storage temperature over 6℃, ambient temperature below 38℃ and solar irradiance surpassing 500 W/m2. The proposed system can match the climatic conditions in fruits and vegetables harvest season of Nanning, a typical city in subtropical zone.