Research Papers

Heat and Mass Transfer Processes and the Performance Evaluation in Single-Slope Solar Stills

[+] Author and Article Information
David A. Aderibigbe

Department of Mechanical Engineering Faculty of Engineering,
University of Lagos,
Akoka, Lagos, Nigeria
e-mail: daader@gmail.com

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering: Including Wind Energy and Building Energy Conservation. Manuscript received February 2, 2019; final manuscript received May 4, 2019; published online May 28, 2019. Assoc. Editor: Isaac Mahderekal.

J. Sol. Energy Eng 141(6), 061007 (May 28, 2019) (7 pages) Paper No: SOL-19-1046; doi: 10.1115/1.4043750 History: Received February 02, 2019; Accepted May 07, 2019

The paper reviews the present understanding of the analysis of the heat and mass transfer processes in single-slope solar stills. By using the results of published experiments, it is proposed that the heat and mass transfer phenomena from the basin water to the glass cover are coupled. This coupling makes it possible to derive the dependence of the heat transfer coefficient for condensation on the inclination of the glass cover of the still. The derived relation, i.e., Nucon = 0.738 (Grcon*Prcon*sin β/Ja*)¼ A−1 where A is the aspect ratio, has been demonstrated to be an important expression for predicting the heat transfer coefficient for condensation hcon necessary for a more realistic evaluation of the overall efficiency of single-slope solar still of a given cover angle β.

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Grahic Jump Location
Fig. 1

Heat fluxes in a single-effect solar still

Grahic Jump Location
Fig. 2

Schematic of the circulation of air-water vapor mixture in a solar still [4] with coupled heat fluxes

Grahic Jump Location
Fig. 3

Schematic of the temperature profile in laboratory solar still [4]

Grahic Jump Location
Fig. 4

Graphical plot of Ja* as a function of 0.297 (Grcon*Prcon*sin β)/(A*Nucon)4 for values of A = 3 and cover inclination β in the range 5–40 deg

Grahic Jump Location
Fig. 5

Film condensation on the underside of an inclined plate



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