The Design Of A New Generation Of Twin Screw Refrigeration Compressors

The design of two series of twin screw compressors for being used in refrigeration applications are reported in this paper. The capacity range for the open type series is from 85 to 4300 h m / 3 , and for the semi-hermetic series from 120 to 2600 h m / 3 . The rotor profile and other design parameters are optimized with the help of the software package SCCAD. Many new features are adopted in the design such as variable built-in volume ratio, anti-friction bearing and automatic capacity control. The new compressors are also suitable for operating with economizer and liquid refrigerant injection systems. The design guidelines discussed in this paper are very helpful for the design of other kind of twin screw refrigeration compressors.