가스 인젝션이 CO2 2단 트윈 로타리 압축기 성능에 미치는 영향

This paper addresses the potential benefits of using vapor injection in a two-stage twin rotary compressor for CO2 heat pump water heater system. Vapor separated from a flash tank in the middle of the expansion process could be used for injection into the second stage suction plenum of the compressor to improve the system performance. Computer simulation showed that increment of the cooling capacity by vapor injection exceeded that of the compressor work, thus improving the system performance: COP improvement by vapor injection was calculated to be about 5-14 % for normal operating conditions.