Investigation on Heat Transfer performances of Nanofluids in Solar Collector
Nanofluids containing Al2O3,ZnO,and MgO nanoparticles were prepared with distilled water as base fluid by violent stirring and ultrasonic dispersing.The forced convective heat transfer performances of the as-prepared nanofluids in tubular solar collector were investigated.The experimental results showed that the heat transfer efficiencies of Al2O3,ZnO,and MgO nanofluids were all increased in comparison to distilled water.For 1.0% vol.Al2O3,ZnO,and MgO nanofluids,the difference in temperature between nanofluids and distilled water all could exceed 3 ℃ in a days cycling.In daytime,from 6:00 a.m.to 18:00 p.m.,the maximum differences in temperature of nanofluids and distilled water appeared at about 10:00 a.m.,while the maximum temperatures were achieved at about 15:00 p.m.for both nanofluids and distilled water.In night,the temperatures of nanofluids still keep more than 1 ℃ higher than distilled water,which indicated that nanofluids could retain more heat energy.The viscosities and heat transfer efficiencies augmented with concentration increasing for ZnO nanofluids.Even at 0.2% vol.concentration,the difference in temperature between ZnO nanofluids and distilled could reach 2.55 ℃.Based on low viscosity and excellent heat transfer performance,0.2% vol.concentration ZnO nanofluid was an attractive option to be applied in solar energy utilization.
Heat transfer Nanofluid Solar energy Solar collector
Yang Li Huaqing Xie Wei Yu Jing Li
School of Urban Development and Environmental Engineering,Shanghai Second Polytechnic University,Shanghai,China,201209
国际会议
大理
英文
33-36
2011-08-18（万方平台首次上网日期，不代表论文的发表时间）