DESIGN AND PARAMETRIC INVESTIGATION ON EJECTOR FOR R-744 TRANSCRITICAL SYSTEM
A R-744 transcritical ejector for a residential air conditioning unit was developed. The velocity of nozzle throat part in the ejector, which is the sonic velocity in two-phase CO2 fluid, was calculated with two difference models. The results from the two models were compared. In order to improve the flashing process in the throat part, the throat part pressure was analyzed and calculated according to the metastable fluid character. According to the analysis above and based on energy, mass continuity and momentum equations, the pressure and velocity distribution along the nozzle were calculated. Two different models were applied in the mixing part calculation: an isobaric model and a pressure rising model. The velocity and pressure distribution from these two models were compared and discussed. The diffuser part was calculated based on energy, mass continuity and momentum equations.
S.Zha A.Jakobsen A.Hafner P.Neksa
NTNU, Kolbjφrn Hejes vei 1B, 7491 Trondheim, Norway SINTEF Energy Research, Kolbjφrn Hejes vei 1D, 7465 Trondheim, Norway
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）