Study of Hybrid Ejector-Vapor Compression Air-Conditioning System Using Solar Energy

摘要

The ejector cycle has been recognized as a promising cycle for the utilization of solar energy for cooling. However, the conventional ejector cycle suffers from low efficiency due to a low evaporation temperature. This paper proposes a hybrid ejector-vapor compression heat pump cycle. This hybrid system uses an ejector cycle on the high-temperature side and a two-stage vapor compression cycle on the low-temperature side to enhance the cycle performance of a solar-powered air conditioner. A cycle simulation showed that the proposed hybrid ejector cycle could operate during both the heating and cooling seasons and would provide energy savings. The average energy-saving potential during the cooling season is about 20%, if half of the floor area is covered by the solar collector.