Solar evaporation via nanofluids: A comparative study

RENEWABLE ENERGY

卷:122

Article; Proceedings Paper

Zeiny, Aimen^1,3  Jin, Haichuan²  Lin, Guiping²  Song, Pengxiang⁴  Wen, Dongsheng^1,2 

[1] Univ Leeds, Sch Chem & Proc Engn, Leeds LS2 9JT, W Yorkshire, England

[2] Beihang Univ, Sch Aeronaut Sci & Engn, Beijing, Peoples R China

[3] Univ Kufa, Dept Mech Engn, Najaf, Iraq

[4] State Grid Corp China, Global Energy Interconnect Res Inst Europe GmbH, Berlin, Germany

关键词: Direct absorption;    Nanofluid;    Solar energy;    Solar evaporation;    Economic analysis;   

DOI  :  10.1016/j.renene.2018.01.043

来源: Elsevier

【 摘 要 】

Vaporisation (evaporation and boiling) through direct absorption solar collectors (DASCs) has recently drawn significant attention. Many studies suggested that plasmonic nanoparticles, such as gold nano particles, can significantly enhance the photo-thermal conversion efficiency of DASCs. However, there is still a lack of comparative studies of the feasibility of using gold nanoparticles for solar applications. This study performed well-controlled experiments for two different categorised particles, i.e., gold and carbon black suspended in water, and assessed their performance in terms of evaporation rate, materials cost and energy consumption. The results show that gold nanofluids are not feasible for solar evaporation applications, where the cost of producing 1 g/s vapour is similar to 300 folds higher than that produced by carbon black nanofluids. This infeasibility is mainly due to the high cost and the low absorbance of gold comparing to carbon black nanoparticles. Moreover, this work reveals that with the increase of nano particle concentration or incident solar radiation, more energy is trapped in a small volume of the nanofluid near the interface, resulting in a local higher temperature and a higher evaporation rate. For efficient steam production, future optimisation of the system should consider concentrating more solar energy at the interface to maximize the energy consumed for evaporation. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

Free