Capacity control of screw compressors: speed or slider control – a comparative study

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 th...

Screw Compressors Control of Vi and Capacity 'The Conflict

Design and Implementation of Compressor Controller using Optimized VSD algorithm

Considering the high consumption of the air compressors, a control system of screw compressor is designed and implemented to deal with energy saving and localization of mentioned compressor. In this paper the variable speed drive (VSD) control algorithm based on proportional-integral-derivative (PID) controller is optimized to decrease power consumption and more stable motor speed and outlet pr...

Optimisation of Screw Compressors

Increasing demands for more efficient screw compressors require that compressor designs are tailored upon their duty, capacity and manufacturing capability. A suitable procedure for optimisation of the screw compressor shape, size, dimension and operating parameters is described here, which results in the most appropriate design for a given compressor application and fluid. It is based on a rac...

Continuous and Discontinuous Capacity Control for High Speed Refrigeration Compressors

The objective of this theoretical investigation was to find a capable and economical way of controlling high speed refrigeration compressors with a low number of cylinders. Compressors with 4 cylinders or more allow control by cutting-off one or two cylinder blocks because the remaining blocks maintain a sufficient smoothness of low speed fluctuation. The type of regulation to be found in this ...