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Effect of absorber plate surface shape and glass cover inclination angle on the performance of a passive solar still

Hamid Reza Goshayeshi (Department of Mechanical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran)
Mohammad Reza Safaei (Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam and Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 19 July 2019

Issue publication date: 22 May 2020

Abstract

Purpose

Solar-driven water desalination technologies are rapidly developing with various links to other renewable sources. However, the efficiency of such systems severely depends on the design parameters. This paper presents results from an investigation on the effect of the glass cover inclination angle on the performance of two stepped solar still geometries (flat and convex) and the amount of produced distilled water.

Design Methodology Approach

Studied inclination angles of 25°, 27.5°, 30°, 32.5° and 35° were chosen, while other design parameters were fixed.

Findings

The investigation showed that the unit with the convex absorber plate had higher average water daily production rate, compared to the output of the flat absorber plate unit. The results also depicted that the inclination angle of the still has a noticeable effect on the performance of solar stills. The value of the critical angle is 32.5°, and the higher inclination angle results in less heat transfer coefficient. This value can be used for design purposes and erases the typical assumption to use lower angles to optimize the productivity of the still.

Practical Implications

Finally, obtained data were used to correlate the Nusselt number for the flat and convex surfaces with different inclination angles of the glass cover.

Originality Value

The outcome of this investigation may find applications to develop highly efficient solar stills to secure more drinkable water in warm, dry lands.

Keywords

Acknowledgements

Conflict of Interests. The authors declare that there is no conflict of interests regarding the publication of this paper.

Citation

Goshayeshi, H.R. and Safaei, M.R. (2020), "Effect of absorber plate surface shape and glass cover inclination angle on the performance of a passive solar still", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 30 No. 6, pp. 3183-3198. https://doi.org/10.1108/HFF-01-2019-0018

Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited