Second Law Thermodynamic Analysis of a Solar Single-Stage Absorption Refrigeration System

摘要

This paper deals with thermodynamic simulation and Second-Law analysis of single-stage solar driven absorption refrigeration system operating with Lithium bromide-water solution. A MatLab-based routine was developed to determine thermodynamic properties of the working fluid and the performance simulation results under different operating conditions. The entropy generation of each component and the total entropy generation S_(tot) of all the system components as well as the coefficient of performance (COP) of the solar absorption refrigeration system are calculated. The trend in COP and S_(tot) with the change in heat exchanger effectiveness, generator, evaporator, absorber and evaporator temperatures are investigated. The results showed that an increase in the generator temperature results in an increase in COP and then decrease while the total entropy generation of the system increased. The COP is more sensitive to changes in the operating conditions of the generator and the evaporator or any other component that affects them, while the total entropy generation considers the effect of all the system components.