Improved design method of a rotating spool compressor using a comprehensive model and comparison to experimental results

10th International Conference on Compressors and their Systems

Bradshaw, Craig R.^1 ; Kemp, Greg^2 ; Orosz, Joe^2 ; Groll, Eckhard A^3

Building and Environmental Thermal Systems Research Group, Mechanical and Aerospace Engineering at Oklahoma State University, 218 Engineering North, Stillwater

OK

74074, United States^1

Torad Engineering LLC, Cumming

GA

30040, United States^2

Ray W. Herrick Research Laboratories, Mechanical Engineering at Purdue University, 177 S. Russell St., West Lafayette

IN

47907, United States^3

关键词: Comprehensive model;    Design process;    Eccentricity ratios;    Improved designs;    Isentropic efficiency;    Length to diameter ratio;    Predicted performance;    Volumetric efficiency;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/232/1/012056/pdf
DOI  :  10.1088/1757-899X/232/1/012056

来源: IOP

【 摘 要 】

An improvement to the design process of the rotating spool compressor is presented. This improvement utilizes a comprehensive model to explore two working uids (R410A and R134a), various displaced volumes, at a variety of geometric parameters. The geometric parameters explored consists of eccentricity ratio and length-to-diameter ratio. The eccentricity ratio is varied between 0.81 and 0.92 and the length-to-diameter ratio is varied between 0.4 and 3. The key tradeoffs are evaluated and the results show that there is an optimum eccentricity and length-to-diameter ratio, which will maximize the model predicted performance, that is unique to a particular uid and displaced volume. For R410A, the modeling tool predicts that the overall isentropic efficiency will optimize at a length-to-diameter ratio that is lower than for R134a. Additionally, the tool predicts that as the displaced volume increases the overall isentropic efficiency will increase and the ideal length-to-diameter ratio will shift. The result from this study are utilized to develop a basic design for a 141 kW (40 tonsR) capacity prototype spool compressor for light-commercial air-conditioning applications. Results from a prototype compressor constructed based on these efforts is presented. The volumetric efficiency predictions are found to be very accurate with the overall isentropic efficiency predictions shown to be slightly over-predicted.