The effect of tilt angle on solar still productivity at different seasons in arid conditions (south Algeria)

Cherraye, Ridha; Bouchekima, Bachir; Bechki, Djamel; Bouguettaia, Hamza; Khechekhouche, Abderrahmane

doi:10.1080/01430750.2020.1723689

Cited by 25 publications

(13 citation statements)

References 39 publications

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“…Over the years extensive research has been carried out in an attempt to enhance the productivity of these devices. Several inventive methods, such as utilizing different absorber materials (Arunkumar et al, 2018, including thermal energy storage Hasan, 2019, Sakthivel andArjunan, 2019), varying the cover tilt angle (Cherraye et al 2020. Azooz and Younis, 2016, Dev and Tiwari, 2009, adding external condensers (Hassan et al 2020, Al-Hamadani andShukla, 2013), adding features to increase the absorption area El-Sabaii andEl-Naggar, 2017, El-Sabaii et al, 2015), using fins within the enclosure (Subhani andKumar, 2019, El-Sabaii et al, 2000) and using mirrors to increase the incident radiation (Karimi Estahbanati et al, 2016, Tanaka, 2009 have all been examined.…”

Section: Introductionmentioning

confidence: 99%

The use of passive baffles to increase the yield of a single slope solar still

2021

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Despite their relative simplicity, single slope solar stills remain one of the most viable solutions to the production of freshwater from saline and non-potable water sources. Over the years, numerous researchers have attempted to improve the yield of single slope solar stills through changes to their geometry and the use of various design modifications. Despite this long history of research, one modification that has not been fully explored is the use of passive baffles to alter the natural convection inside them.Though baffles have frequently been used to suppress natural convection in enclosures, there may also be the opportunity to use them to enhance natural convection. This judicious placement of baffles to enhance the natural convection could potentially improve the yield from single slope solar stills, however it has not been well explored in the literature.To address this issue, this work examined the effect of vertically mounted passive baffles on the natural convection inside a single slope solar still geometry. In this vein, a computational fluid dynamics simulation was conducted for a still containing a baffle, with the results validated experimentally using particle image velocimetry. On this basis, subsequent simulations explored the effect of baffle length and position on stills with cover angles from 10˚-60˚. The results showed that baffles did have a marked influence on the natural convection flow field and could increase the natural convection heat transfer coefficient, which is directly proportional to a solar still's yield, by up to 20%.It was also found that short baffles enhanced natural convection at low cover angles, while baffles mounted close to the front of a still provided an improvement to the transfer processes over the widest range of conditions. Finally, the work led to the development of a relationship to describe the effect of baffles on natural convection, as shown in Equation 1, that it is hoped will aid designers of single slope solar stills in the future. 𝑁𝑢′ = 𝑅𝑎′ 0.188 * 𝐴𝑅 −0.29 * (cos 𝜃) −0.5 * ( 𝑏 𝐵

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Section: Introductionmentioning

confidence: 99%

The use of passive baffles to increase the yield of a single slope solar still

2021

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“…Some researchers have tried to adjust the glazing angle to maximize pure water production; they have found that the best angles vary between 20°and 30°. The best glazing angle was 30°with an output of 3517 kg/m 2 in the autumn season and 3633 kg/m 2 in the winter; the best inclination was 20°with a yield of 5224 kg/m 2 in the spring season and 4527 kg/m 2 in the summer season [27].…”

Section: Introductionmentioning

confidence: 97%

Energy, Exergy Analysis, and Optimizations of Collector Cover Thickness of a Solar Still in El Oued Climate, Algeria

Khechekhouche¹,

Manokar

Sathyamurthy

et al. 2021

International Journal of Photoenergy

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Researches in many laboratories on solar still desalination are concerned with increasing efficiency using only solar energy. One of the techniques is the difference in the thickness of the glass cover of the distiller. In order to see the influence of this parameter on efficiency, three similar stills with three different glass coverings were investigated. The flow of heat goes through the cover, and higher glass temperature leads to solar still productivity becoming lower. This paper presents an optimization of glass thickness ( G t ) of a conventional solar still (CSS) in El Oued climate, Algeria. Based on the experimental results, the distilled water production rate, energy, and energy efficiency of the CSS have been discussed. The results showed that the suitable G t of the CSS was 3 mm. The distilled water of around 3.15, 2.02, and 1.13 kg was produced by the CSS at energy efficiency of 30.71, 19.02, and 11.44% with the G t of 3, 5, and 6 mm, respectively. The daily average exergy efficiency of 2.46, 1.38, and 0.84% was calculated for the CSS at G t of 3, 5, and 6 mm, respectively.

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“…Gawande et al [30] studied on the shape of absorber surface and performance of the stepped type solar still by utilizing convex, concave absorber instead of flat absorber and indicated increase in the productivity of 57⁒ and 29⁒, respectively. The effect of tilt angle on the productivity of a solar still was experimentally studied by Cherraye et al [31]. The experiments were performed in arid climate of Ouargala city, Algeria.…”

Section: Introductionmentioning

confidence: 99%

Effect of Steps Height and Glass Cover Angle on Heat Transfer Performance for Solar Distillation: Numerical Study

2022

IJE

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The effect of tilt angle on solar still productivity at different seasons in arid conditions (south Algeria)

Cited by 25 publications

References 39 publications

The use of passive baffles to increase the yield of a single slope solar still

The use of passive baffles to increase the yield of a single slope solar still

Energy, Exergy Analysis, and Optimizations of Collector Cover Thickness of a Solar Still in El Oued Climate, Algeria

Effect of Steps Height and Glass Cover Angle on Heat Transfer Performance for Solar Distillation: Numerical Study

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