R410A单工质复叠制冷系统变工况㶲分析  

Exergy Analysis of High and Low Temperature Conversion of R410A Single-medium Cascade Refrigeration System

作　　者：杨永安 孙浩迪 YANG Yongan;SUN Haodi(Engineering Research Center of Refrigeration Technology,Tianjin University of Commerce,Tianjin 300134,China)

机构地区：[1]天津商业大学冷冻冷藏技术教育部工程研究中心,天津300134

出　　处：《制冷技术》2023年第1期16-22,共7页Chinese Journal of Refrigeration Technology

摘　　要：本文搭建R410A单工质复叠制冷系统实验台,研究了蒸发温度(t_(e))和冷凝温度(t_(k))对制冷量、性能系数(COP),各组成部件及系统㶲损和㶲效率的影响。结果表明:当t_(e)从-30℃增至-10℃,系统总㶲损减小了0.722 kW,COP增大了0.75,系统总㶲效率先增大后减小,减小了2.68%。t_(k)从30℃增大至50℃,系统总㶲损增大了1.392 kW,COP减小了0.632,系统总㶲效率减小了22.01%。系统各部件中压缩机㶲损、低温级压缩机㶲损、高温级压缩机㶲损和冷凝蒸发器㶲损较大,且受t_(e)和t_(k)的影响较大,是系统薄弱部位所在。减小t_(k),增大t_(e)有利于降低系统的㶲损,提高系统的㶲效率和COP。R410A single working medium cascade refrigeration syst_(e)m experimental bench is set up to study the effects of evaporation t_(e)mperature(t_(e))and condensation t_(e)mperature(t_(k))on cooling capacity of the syst_(e)m,coefficient of performance(COP),exergy loss and exergy efficiency of each component and the whole syst_(e)m.The results showed that,when t_(e)is increased from-30℃to-10℃,overall exergy loss of the syst_(e)m is decreased by 0.722 kW,COP is increased by 0.75,overall exergy efficiency of the syst_(e)m is increased first and then decreased,and finally decreased by 2.68%.From 30℃to 50℃,the overall exergy loss of the syst_(e)m is increased by 1.392 kW,COP is decreased by 0.632,and overall exergy efficiency of the syst_(e)m is decreased by 22.01%.Exergy loss of compressor,low-t_(e)mperature stage compressor,high-t_(e)mperature stage compressor,and the evaporative condenser are relatively large in various components of the syst_(e)m.And they are greatly affect_(e)d by t_(e)and t_(k),and they are the weak parts of the syst_(e)m.The reduction of t_(k)and increment of t_(e)are beneficial to reduce exergic loss of the syst_(e)m and improve exergic efficiency and COP of the syst_(e)m.

关 键 词：复叠制冷系统 R410A 㶲分析 㶲损失 㶲效率 

分 类 号：TB611[一般工业技术—制冷工程] TB612