A Theoretical Comparison of a Combined Ejector–Absorption Refrigeration System with a Conventional Absorption System

Abstract

This paper presents a mathematical model which has been built to design a combined ejector-absorption refrigeration system, as well as another mathematical model built to design a conventional absorption refrigeration system. Both of these models use lithium Bromide-water as a working solution. The Engineering Equation Solver (EES) Software has been used to perform the mathematical analysis and the design. A comparison of the results for both of the absorption systems for a cooling capacity of (5 Ton) has been done at the same operation conditions, which was obtained from the simulation of the conventional absorption to optimize the system performance, represented by (40.41°C) condenser temperature, (9°C) evaporator temperature and (36.12°C) absorber temperature. But the generator temperature was different for both of the systems. The coefficient of performance obtained was (0.7871) for the conventional absorption refrigeration systems at the generator temperature of (81.94°C), while the value of coefficient of performance was (1.026) for the proposed absorption system at the generator temperature of (200.5°C) which is higher than the coefficient of performance for conventional absorption refrigeration system by about (30.35%) .