溶液热交换器对吸收式制冷机性能影响的研究  

Effects of solution heat exchanger on the performance of absorption chiller

作　　者：万忠民[1] 王晓明[1] 舒水明[2] 范爱武[2] 

机构地区：[1]湖南理工学院 [2]华中科技大学

出　　处：《制冷与空调》2007年第4期28-31,共4页Refrigeration and Air-Conditioning

基　　金：湖南省教育厅资助科研项目(04C271)

摘　　要：建立两级吸收式制冷循环中溶液热交换器的仿真模型,分析溶液热交换器浓溶液进出口温差对两级系统制冷系数、冷却水流量的影响,同时分析逆流、交叉流对溶液热交换器单位换热面积的影响。理论模拟结果得出溶液热交换器浓溶液进出口温差存在一个最佳值,对两级吸收式系统这个最佳温差大约为13℃,其对应的制冷系数增加12.3%,冷却水流量减小8.8%。最佳温差的确定对减小溶液热交换器体积,提高系统经济性和整体效率都有着重要的指导意义。Establishes the simulation model of solution heat exchanger of two-stage absorption refrigeration cycle. Analyzes the effects of strong LiBr solution temperature difference between inlet and outlet of solution heat exchanger on the coefficient of performance （COP） and cooling water flowrate of two-absorption refrigeration cycle, at the same time, the effects of temperature difference on the unit heat exchange area of counterfolw and crossflow solution heat exchangers. The theoretical analysis result shows that there is a optimal value for the strong LiBr solution temperature difference, for the two-stage absorption system, the optimal temperature difference is about 13 ℃, the coresponding COP is 12.3% higher than that of system without heat exchanger, the cooling water flow rate is 8.8% less than that of system without heat exchanger. The optimal temperature difference is helpful for decreasing the volume of solution heat exchanger and improving economic characteristic and system performance.

关 键 词：两级吸收式 溶液热交换器 最佳温差 单位换热面积 

分 类 号：TB651[一般工业技术—制冷工程]