摘要
Abstract
In this article,SiC-H2O,TiC-H2O,and Al2O3-H2O (α andγ) nanofluid were prepared through a two-step method,and the photo-thermal properties of the four nanofluids were studied by an insolation experiment. The impacts of the types of the nanoparticle,mass fraction,dispersants,pH value and particle shapes on photo-thermal properties of nanofluid were investigated. This study also compared the photo-thermal properties of nanofluid in ordinary glass tube and water in all-glass vacuum tube. The results show that photo-thermal properties of nanofluid are better than those of deionized water and all-glass vacuum tube.Among the nanofulids,the performance of TiC-H2O nanofluid is the best,with the peak temperature of 21.76% higher than that of deionized water. Dispersants can enhance the photo-thermal properties of nanofluid,but,each nanofluid has its own suitable dispersants. The optimal mass fraction and pH value are found in this experiment,and those for SiC-H2O are 0.1%(mass fraction) and 9,respectively. The shape of particle also has a major impact on the photo-thermal properties of nanofluid.Under the 55℃,direct absorption collecting efficiency using SiC-H2O nanofluid is higher than that of traditional all-glass vacuum tube using water,the maximal efficiency difference between the two collectors can be up to 30%,but the efficiency for nanofulids decreases rapidly at higher temperature.关键词
纳米流体/光热性能/太阳能/太阳集热管/稳定性Key words
nanofluid/photo-thermal property/solar energy/solar collector tube/stability分类
能源科技
