Exergy Analysis of Ammonia Vapor Compression Refrigeration Systems in Refrigerator on Constant State Temperature

This paper presents a detailed exergy analysis of an actual ammonia vapor compression refrigeration cycle in the refrigerator on constant state temperature,using linear method of fitting the physical properties of ammonia to simulate,and the evaporating temperature constant and variable.A computational model has been developed for computing exergy loss of the various components of the refrigeration system,exergetic efficiency of the system,and coefficient of performance.The results indicate that the exergy loss in the evaporator is highest,followed by the compressor and condenser.Proposed to improve the performance of the ammonia vapor compression system in refrigerator,we must first consider raising the exergetic efficiency of its evaporator,the compressor and condenser.It is suggested that to increase evaporating temperature is a good measure to improve the exergetic efficiency of the system on constant state temperature.