离子液体基纳米流体在太阳能集热管中的性能  

Performance of nanofluid based on ionic liquid inside solar-collector tubes

作　　者：王曦 赵宗昌[1] 张晓冬[1] WANG Xi;ZHAO Zong-chang;ZHANG Xiao-dong(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,Liaoning Province,China)

机构地区：[1]大连理工大学化工学院,辽宁大连116024

出　　处：《化学工程》2020年第9期1-5,共5页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(51376036)。

摘　　要：为满足吸收式制冷和热泵的供热需求,文中制备了以新型热泵工质离子液体[EMIM][DEP]/H2O体系为基液、单壁碳纳米管(SWCNT)为纳米颗粒的纳米流体,流体中纳米颗粒质量分数分别为0.01%,0.02%,0.03%,0.04%,0.05%。利用紫外/可见/近红外分光光度计测量了不同碳纳米管质量分数的纳米流体的透光率,并吸收效率进行计算。利用ANSYS Fluent^■软件对单层盖板和双层盖板的集热管内纳米流体的集热过程进行数值模拟,并计算集热管出口温度和热效率。结果表明:添加少量单壁碳纳米管能够有效提高基液的光吸收性能;在给定的操作条件下,集热管出口温度可以达到吸收式制冷和热泵所需要的发生温度;添加质量分数0.05%的单壁碳纳米管时,覆盖单层和双层玻璃盖板的集热管出口温度最高分别可达361.20 K和371.46 K。The ionic liquid[EMIM][DEP]and water were used as working fluid of heat pumps.A series of nanofluids were prepared in this paper in order to supply heat for absorption refrigeration and heat pumps.The nanofluids contained[EMIM][DEP]/H2O system and single walled carbon nanotubes (SWCNT).The mass fractions of SWCNT are 0.01%,0.02%,0.03%,0.04% and 0.05%.The transmittance of the nanofluids was measured and the absorption efficiency was calculated.The heat collection process of the nanofluids inside solarcollector tubes was simulated by using ANSYS Fluent^■.And the outlet temperature and thermal efficiency of the tubes were calculated.The results show that the photo absorption capacity of the fluid improves after adding SWCNT,the outlet temperature of the solar-collector tubes can meet the requirements of absorption refrigeration,and the maximum outlet temperature of the tubes covered with single-layer glass and double-layer glass are 361.20K and 371.46 K respectively,when the mass fraction of SWCNT is 0.05%.

关 键 词：离子液体 纳米流体 光热转换 吸收效率 数值模拟 

分 类 号：TK513.3[动力工程及工程热物理—热能工程]