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Experimental investigation on a floating multi-effect solar still with rising seawater film

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  • Wang, Lu
  • Zheng, Hongfei
  • Jin, Rihui
  • Ma, Xinglong
  • He, Qian

Abstract

In this paper, a floating multi-effect solar still using parabolic concentrators to directly heat rising seawater film is investigated. The novel desalination device integrates solar still and two concentrators as a whole, which avoids the installation of a heat exchange pipeline and can float on the ocean to produce freshwater. The floating still consists of a front parabolic concentrator, a rear parabolic concentrator, and several embedded distillation cells. The distillation cell is composed of a hydrophilic wick, a condensing plate, and a narrow space in between. The parabolic concentrator greatly increases the solar heat to improve the temperature gradient and enhance the phase transition and diffusion process of water vapor. During desalination, the rising seawater film for evaporation is formed in the hydrophilic wick by capillary force. Through indoor steady-state experiments, some key parameters such as solar irradiance and incident angle on the temperature, water yield and gain output ratio (GOR) of the still were studied. Results indicate that the maximum temperature gradient in the 5-effect still can reach 48.5 °C. Under a 900 W/m2 irradiation, the water productivity and GOR are 2.7 kg/m2/h and 2.2, respectively. Additionally, outdoor experiments show that the daily freshwater reaches 4.7 kg/m2 with an average irradiation of 543 W/m2.

Suggested Citation

  • Wang, Lu & Zheng, Hongfei & Jin, Rihui & Ma, Xinglong & He, Qian, 2022. "Experimental investigation on a floating multi-effect solar still with rising seawater film," Renewable Energy, Elsevier, vol. 195(C), pages 194-202.
  • Handle: RePEc:eee:renene:v:195:y:2022:i:c:p:194-202
    DOI: 10.1016/j.renene.2022.06.001
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    References listed on IDEAS

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    Cited by:

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    2. Arunkumar, T. & Parbat, Dibyangana & Lee, Sang Joon, 2024. "Comprehensive review of advanced desalination technologies for solar-powered all-day, all-weather freshwater harvesting systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 199(C).

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