双级压缩低温贮藏库的技术性能分析

Performance Analysis of Ammonia Two - stage Vapor Compression Refrigeration Systems in Cold Storage

在改变蒸发温度、中间温度和绝热效率的情况下,分别对冷库中的氨双级蒸汽压缩系统进行能量分析,对系统各部件的火用损失和系统的火用效率进行计算分析,得出随着蒸发温度、中间温度和绝热效率的改变,系统各设备的火用损失的变化结果,表明系统存在最佳蒸发温度和最佳中间温度,使系统的性能达到最佳,压缩机的绝热效率越高,系统性能越优。

This paper presents a detailed Thermodynamics and exergy analysis of an actual ammonia two-stage vapour compression refrigeration cycle in the cold storage on variational evaporator temperature,and on variational intermediate temperature,and on variational compressor isentropic efficiency.A computational model has been developed for compu-ting exergy destruction of the various components of the refrigeration system,exergetic efficiency of the system,coefficient of performance.The results indicate that the exergy destruction percent of component of the vapour compression system is change with increase in evaporator temperature and intermediate temperature and compressor isentropic efficiency,the co-efficient of performance（COP） and the exergetic efficiency of the system are change with increase in evaporator tempera-ture and intermediate temperature and compressor isentropic efficiency.There are optimum evaporator temperature and in-termediate temperature for maximum system COP as well as maximum exergetic efficiency.To improve the performance of the system,we must consider increasing compressor isentropic efficiency.