Details

Autor(en) / Beteiligte

• Wang, Xinzhi
• He, Yurong
• Cheng, Gong
• Shi, Lei
• Liu, Xing
• Zhu, Jiaqi

Titel

Direct vapor generation through localized solar heating via carbon-nanotube nanofluid

Ist Teil von

• Energy conversion and management, 2016-12, Vol.130, p.176-183

Ort / Verlag

Oxford: Elsevier Ltd

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •Carbon-nanotube nanofluid was utilized for high efficient solar steam generation.•The evaporation performance was enhanced by concentrating solar power.•Evaporation efficiency up to 46.8% was achieved by carbon nanotube nanofluid.•Localized solar heating at fluid–air interface is responsible for high efficiency. Traditional solar-energy collection systems experience high thermal losses because of the high surface temperature of the absorber. Nanofluid developments have led to extensive studies on their suitability for direct absorption as solar-energy collectors. A potential approach for solar steam generation via nanoparticle absorption of solar light and its conversion to thermal energy for water evaporation has been introduced recently. Direct solar vapor generation enabled by carbon-nanotube nanofluids was investigated experimentally in the present work. The effects of solar-power density and carbon-nanotube concentration on solar steam-generation performance are discussed. The evaporation rate increases with an increase in solar power and carbon-nanotube concentration. A high evaporation efficiency (46.8%) was obtained with a 19.04×10−4vol.% carbon-nanotube nanofluid under a solar illumination power of 10 Sun (1Sun=1kWm−2). A high evaporation rate was achieved by localized heating of the nanofluid rather than by a bulk temperature increase, which provides a mechanism for low-temperature solar vapor generation and exhibits broad solar-energy applications such as seawater desalination, waste sterilization and power generation.