VAPOR INJECTION IN A CO2 TWIN ROTARY COMPRESSOR
Potential advantages of using vapor injection in a two-stage twin rotary compressor for CO2 heat pump water heater system were addressed in this paper by numerical simulation. Vapor separated from a flash tank in the middle of the expansion process was used for injection into the second stage suction plenum of the compressor to improve the system performance. Vapor injection increased the intermediate pressure between the two stages, thus increasing the first stage compressor work and reducing that of the second stage. As a whole, however, the compressor input increased due to injected mass flow rate for the second stage. 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 10％ for normal operating conditions. The displacement volume ratio of the second stage to the first stage at which a maximum COP was obtained changed from 0.65-0.7 to 0.9 by vapor injection. Torque variation was also reduced by vapor injection.
JONG M.AHN WOO Y.KIM HYUN J.KIM SUNG O.CHO
Department of Mechanical Engineering, University of Incheon, Incheon, 402-749, Korea DA R&D Center, Digital Appliance Business, Samsung Electronics Co., Ltd, Suwon, 442-742,Korea
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）