Solar-thermal conversion performance of heterogeneous nanofluids

被引:17
作者
Chen, Xingyu [1 ]
Chen, Meijie [1 ]
Zhou, Ping [1 ]
机构
[1] Cent South Univ, Sch Energy Sci & Engn, Changsha 410083, Peoples R China
基金
中国国家自然科学基金;
关键词
Solar; -thermal; Heterogeneous; Monte Carlo method; Finite element method; Nanofluid; DIRECT-ABSORPTION; HENYEY-GREENSTEIN; COLLECTORS; NANOPARTICLES; RADIATION; SILVER; OXIDE; DASC;
D O I
10.1016/j.renene.2022.08.065
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Nanofluids have excellent optical and thermal properties and show great potential for applications in direct absorption solar collectors (DASCs). However, due to the preparation process or force interaction, the nonuniform distribution of NP radii (r) and volume fraction (fv) in heterogeneous nanofluids may affect the solarthermal conversion performance. In this work, we established a multiscale model based on the finite element method (FEM) coupled with the Monte Carlo (MC) method to investigate the solar-thermal conversion performance of heterogeneous nanofluids. Results show that the non-uniform distribution of r has little effect on the solar-thermal conversion performance due to the weak scattering and strong absorption properties of NPs in dilute nanofluids. The non-uniform distribution of fv has great effect on the local heating flux distribution in the heterogeneous nanofluid, which would affect the collector efficiency (ricol) due to the different surface heat losses. And a superior ricol can be achieved at a downward-gradient distribution of r and fv compared with uniform or upward-gradient distributions. This work develops an effective method to evaluate the solar-thermal conversion performance of heterogeneous nanofluids and provides a promising strategy by tuning the distribution of r and fv to enhance the solar collector performance.
引用
收藏
页码:1307 / 1317
页数:11
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