Vapour compression system analysis undergoing expansion in an ejector

Abstract

This paper presents the analysis of a vapour compression system undergoing isentropic expansion in an ejector instead of irreversible isenthalpic expansion in conventional expanding devices i.e. capillary tube, thermostatic expansion valve etc. Comparative energy analysis of the optimized ejector expansion vapour compression system (EEVCS) has been done for commercially used refrigerants R134a, R407C and R410A and it is found that the COP enhancement over standard vapour compression system (VCS) is maximum for R410A (11.49%) followed by R407C (10.16%) and least in R134a (9.261%) at fixed condenser and evaporator temperature of 35°C and 5°C respectively. COP of both the systems decreases with the increase in condenser temperature, however the optimized ejector expansion vapour compression system exhibits less drop in its performance as compared to standard vapour compression system at the same condenser and evaporator temperature. The computational analysis has been carried out in Engineering Equation Solver (EES).