Performance simulation of scroll compressors

The scroll compressor is widely used in air conditioning and heat pump plant because it combines high efficiency and reliability with low noise and vibration. This paper describes a simulation model for estimating the performance of such machines. The model includes consideration of both the compression process and the dynamic behaviour of the moving parts. The compression process is modelled on the assumption of the working chamber as a control volume to which the equations of conservation of mass and energy are applied, allowing for radial and flank leakage and suction refrigerant heating. The derived output from the model includes a pressure-volume diagram of the compression process together with the resultant forces on the components, friction losses within the machine and temperatures of the main components within the compressor. Estimates of the volumetric, adiabatic and mechanical efficiencies of the scroll compressor are then obtained directly from this. Performance estimates thus obtained may be used for the development of the package air conditioning system.