Mechanical efficiency of various large capacity scroll compressors.

This study presents the characteristics of the mechanical efficiency and the crankshaft speed fluctuation ratio of various large capacity scroll compressors. To introduce the different suction volumes of the scroll compresor, the scroll height and the involute base circle radius are individually increased proportionally based on a small capacity scroll compressor, and their effects on the mechanical efficiency and the speed fluctuation ratio are discussed. It was discovered that it is better to increase the involute base circle radius rather than the scroll height to obtain higher mechanical efficiency. Also it was discovered that the speed fluctuation ratio is nearly the same, independent of the scroll height and the involute base circle radius.