Comparative Study on Two-Stage Absorption Refrigeration Systems with Different Working Pairs  

作　　者：KONG Xiangqiang MENG Xiangri LI Jianbo SHANG Yamping CUFulin 孔祥强;孟祥熙;李见波;尚燕平;崔福林(College of Mechanical and Electronic Engineering,Shandong University of Science and Technology.Qingdao 266590,Shandong,China)

机构地区：[1]College of Mechanical and Electronic Engineering,Shandong University of Science and Technology.Qingdao 266590,Shandong,China

出　　处：《Journal of Shanghai Jiaotong university(Science)》2021年第2期155-162,共8页上海交通大学学报（英文版）

基　　金：the National Natural Science Foundation of China(No.51776115);the Shandong Province Graduate Student Supervisor Guidance Ability Promotion Program(No.SDYY17037);the Shandong Univeisity uf 3uieuue ad Teuluulugy Giauluale 3uusdent Supervisor Guidance Ability Promotion Program(No.KDYC17009)。

摘　　要：The objective of this paper is to present a simulation study on the two-stage absorption refrigeration systems of 2.5 kW capacity using LiBr-H2O,NH3-H2O and R124-DMAC as working pairs.Under the design condition that the generating,absorbing,evaporating and condensing temperatures are 75℃,45℃,5℃and 40℃,respectively,the high and low pressure side solution circulation ratios and the coefficient of performance(COP)for the systems are calculated.Then the influences of medium,generating,absorbing,evaporating and condensing temperatures on system performances are analyzed.The results show that under the design condition,the COP of the LiBr-H2Osystem can reach 0.49,superior to those of the NH3-H2O and R124-DMAC systems,which are 0.32 and 0.31,respectively.Furthermore,the medium temperature for higher COP lies in an interval of 64-67℃for the LiBr-H2O.NH3-H2O and R124-DMAC systems.High generating temperature and low absorbing temperature can decrease the high and low pressure side solution circulation ratios,and can also increase the COP.High evaporating temperature can decrease the low pressure side solution circulation ratio and increase the COP.Low condensing temperature can decrease the high pressure side solution circulation ratio and increase the COP.

关 键 词：absorption refrigeration two-stage system working pair cycle characteristics 

分 类 号：TB61[一般工业技术—制冷工程]