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Numerical study of a passive solar still with separate condenser

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  • Madhlopa, A.
  • Johnstone, C.

Abstract

A passive solar still with separate condenser has been modeled and its performance evaluated. The system has one basin (basin 1) in the evaporation chamber and two other basins (2 and 3) in the condenser chamber, with a glass cover over the evaporator basin and an opaque condensing cover over basin 3. Basins 1, 2 and 3 yield the first, second and third effects respectively. The top part of the condensing cover is shielded from solar radiation to keep the cover relatively cool. Water vapor from the first effect condenses under the glass cover while the remainder of it flows into the condenser, by purging and diffusion, and condenses under the liner of basin 2. The performance of the system is evaluated and compared with that of a conventional solar still under the same meteorological conditions. Results show that the distillate productivity of the present still is 62% higher than that of the conventional type. Purging is the most significant mode of vapor transfer from the evaporator into the condenser chamber. The first, second and third effects contribute 60, 22 and 18% of the total distillate yield respectively. It is also found that the productivity of the solar still with separate condenser is sensitive to the absorptance of the liner of basin 1, and the mass of water in basins 1 and 2. The mass of water in basin 3 and wind speed have marginal effect on distillate production. Other results are presented and discussed in detail.

Suggested Citation

  • Madhlopa, A. & Johnstone, C., 2009. "Numerical study of a passive solar still with separate condenser," Renewable Energy, Elsevier, vol. 34(7), pages 1668-1677.
    • Handle: RePEc:eee:renene:v:34:y:2009:i:7:p:1668-1677
    DOI: 10.1016/j.renene.2008.12.032
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    References listed on IDEAS

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