UPGRADING INDUSTRIAL THERMAL EFFLUENTS USING MULTIPLE-STAGE VAPOR JETCOMPRESSORS - MODELING AND ANALYSIS

Vapour jet compressors with multiple stages were studied and their per formance characteristics with varying number of stages, waste heat tem peratures and temperature boosts were obtained. The numerical model of the multiple-stage vapour jet compressor is based on equations obtain ed by applying the theory of ejectors. Computer simulation proved to b e an effective tool for obtaining performance characteristics of multi ple-stage vapour jet compressors. Results show that the COP does not n ecessarily increase with increasing number of ejector stages. Also, op ting for a vapour jet heat pump with more than two stages will not con tribute to improving its performance within the usual temperature rang es of industrial applications.