Volume 53

Performance Variation of Enhanced Vapor Injection System Chiyuan Ma, Chunlu Zhang

Abstract

The enhanced vapor injection system (EVIS) has received considerable attention for its energy efficiency. In this paper, the EVIS is in-depth studied theoretically and numerically. First, the EVIS is equated to two cascaded single-stage systems. Then, the expression of the EVIS COP as a function of the intermediate temperature is obtained and numerically analyzed based on a new assumption of thermal perfection. The results show that there is not always an optimal intermediate temperature for the EVIS. Under different compressor isentropic efficiencies, the EVIS performance shows four different trends with the intermediate temperature. This finding will be of great value for the design and maintenance of EVIS and all types of two-stage compression systems.

Keywords Intermediate temperature, enhanced vapor injection system, thermodynamic analysis