离子液体基工质对的吸收制冷循环性能实验研究  

Performance experiments on absorption refrigeration cycle with ionic liquid-based working pairs

作　　者：赵宗昌[1] 苏成睿 张晓冬[2] ZHAO Zongchang;SU Chengrui;ZHANG Xiaodong(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;School of Chemical Machinery and Safety Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学化工学院,辽宁大连116024 [2]大连理工大学化工机械与安全工程学院,辽宁大连116024

出　　处：《化工进展》2018年第7期2524-2530,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金项目(51376036)

摘　　要：分别对以离子液体1-乙基-3-甲基咪唑磷酸二乙酯[Emim][DEP]为吸收剂的二元工质对[Emim][DEP]+H2O和以[Emim][DEP]+Li Br为吸收剂的三元工质对Li Br+[Emim][DEP]+H2O的吸收制冷循环性能进行了实验研究,用于评价这种新型的工质对的制冷性能。实验结果表明,二元工质对[Emim][DEP]+H2O具有吸收制冷性能,但与Li Br+H2O工质对相比,其制冷系数较低。当发生温度为90℃、循环水温度为30℃、蒸发温度在10~15℃时,制冷系数仅为0.16~0.28。主要原因是[Emim][DEP]+H2O工质对具有较高的黏度和较低的热导率,导致吸收器降膜吸收传热系数较低,吸收器吸收水蒸气的能力不足。为了强化其制冷效果,在[Emim][DEP]+H2O工质溶液中加入少量Li Br水溶液,构成三元工质对Li Br+[Emim][DEP]+H2O。实验结果表明,三元工质对Li Br+[Emim][DEP]+H2O的制冷性能优于二元工质对[Emim[DEP]+H2O,在上述蒸发温度范围内,制冷系数能够达到0.17~0.34,并且制冷温度更低。The performance test of the absorption refrigeration cycle with ionic liquid,1-ethyl-3-methylimidazolium diethylphosphate [Emim][DEP]-based binary working pairs [Emim][DEP]＋ H2 O and ternary working pairs Li Br＋ [Emim][DEP] ＋ H2 O were conducted in order to evaluate the refrigeration effects of this new ionic liquid-based working pairs. The experiment results showed that the ionic liquid-based working pairs [Emim][DEP]＋H2 O was capable of refrigeration. Compared with the working pairs Li Br＋H2 O,[Emim][DEP]＋H2 O lowered the performance coefficient of refrigeration cycle due to its lower thermal conductivity and higher viscosity which led to absorbing water steam ability of [Emim][DEP]＋H2 O in absorber more weak under the same size of absorber. When the generation temperature and cooling water temperature were 90℃ and 30℃,respectively,the evaporation temperature was in the range of 10 to 15℃,the performance coefficient of refrigeration cycle varied from 0.16 to 0.28. In order to enhance the absorbing ability to water steam in absorber and consequently to real performance of absorption refrigeration cycle,small amount of solution Li Br＋ H2 O was added into the [Emim][DEP]＋H2 O and constituted ternary working pairs Li Br＋ [Emim][DEP]＋H2 O,the experiment results showed that the performance coefficient of refrigeration cycle of ternary working pairs Li Br＋ [Emim][DEP]＋H2 O was superior to that of [Emim][DEP] ＋ H2 O,and varied from 0.17 to 0.34 when the evaporation temperature was in the range of 10℃ to15℃.

关 键 词：吸收制冷 制冷系数 离子液体基工质对 三元工质对 性能强化 

分 类 号：TB616[一般工业技术—制冷工程]