spool compressor, comprehensive model, design improvement
An improvement to the design process of the rotating spool compressor is presented. This improvement utilizes aÂ comprehensive model to explore two working fluids (R410A and R134a), various displaced volumes, at a variety ofÂ geometric parameters. The geometric parameters explored consists of eccentricity ratio and length-to-diameter ratio.Â The eccentricity ratio is varied between 0.81 and 0.92 and the length-to-diameter ratio is varied between 0.4 and 3.Â The key tradeoffs are evaluated and the results show that there is an optimum eccentricity and length-to-diameter ratio,Â which will maximize the model predicted performance, that is unique to a particular fluid and displaced volume. ForÂ R410A the modeling tool predicts that the overall isentropic efficiency will optimize at a length-to-diameter ratio thatÂ is lower than for R134a. Additionally, the tool predicts that as the displaced volume increases the overall isentropicÂ efficiency will increase and the ideal length-to-diameter ratio will shift. The result from this study are utilized to developÂ a basic design for a 141 kW (40 tonsR) capacity prototype spool compressor for light-commercial air-conditioningÂ applications.