A comparison of SRM and Globoid type screw compressors

A study is presented of two similar types of compressors belonging to the same family, ie positive displacement, oil-injected compressors. They were both screw compressors, one of the SRM type and the other of the Globoid type. The comparison was made between two compressors with the same swept volume. The compressor geometry and losses were analysed theoretically. This analysis showed that SRM compressors have certain advantages which should result in better efficiency. It has been shown elsewhere¹⁷ that results of test runs verify the results of the theoretical comparison.