Abstract
ABSTRACT The main objective of the present study is to develop a solar thermal hybrid variable refrigerant flow (VRF) air-conditioning system and predict energy saving in this system compared to normal VRF air-conditioning system. In R410a based VRF system compressor works partially to increase pressure and temperature up to 27 bar, 55°C from compressor suction pressure and temperature 27 bar, 55°C. Further increase in temperature and pressure from approximate 55°C, 27 bar (Solar heat exchanger inlet) to 80°C, 34.39 bar (Solar heat exchanger outlet) is achieved with the help of evacuated tube type solar collector-based heat exchanger. The calculation of energy saving in solar thermal hybrid VRF system has been compared with fully electric-fired VRF system. The energy saving of approximate 45–50% can be achieved in solar thermal hybrid VRF system as compared to normal VRF system.
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