22 May 2008

EFFECTS OF EJECTOR ON PERFORMANCES OF QUASI TWOSTAGE COMPRESSION HEAT PUMP SYSTEM COUPLED WITH EJECTOR


To improve the performance and enlarge the operation conditions of air-source
heat pump, a quasi two-stage compression heat pump system coupled with ejector was
designed. The prototype of the heat pump system coupled with ejector was experimented
comprehensively when condensation temperature keeps at 45ºC and evaporation
temperature varies from -8ºC to -25ºC and the effects of the ejectors on the performances of
the heat pump was discussed. The results demonstrate that the heat pump coupled with the
ejector with optimized construction has higher coefficient of performance in a wide range of
operation conditions and achieve its better performances while the ejection coefficient (u) is
0.1.