Performance evaluation of a new stepped solar still under the desert climatic conditions

Saadi, Zine; Rahmani, A.; Lachtar, Salah; Soualmi, Hamou

doi:10.1016/j.enconman.2018.06.114

Cited by 84 publications

(12 citation statements)

References 43 publications

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“…Its daily output was 4.35 L/m 2 day. (Saadi et al 2018) modified a conventional solar still by integrating a stepped evaporator on a higher vertical side and compared it to a conventional solar still under desert weather. The productivity obtained the highest of 5.82 L/m 2 day in the summer season when the solar intensity is the highest in a year, following spring, autumn, and winter, which proved that daily yield is directly proportional to solar irradiation.…”

Section: Stepped Basin and Weir Type Basinmentioning

confidence: 99%

Influence of Various Basin Types on Performance of Passive Solar Still: A Review

Pham

Hadiyanto

et al. 2021

Int. J. Renew. Energy Dev.

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Passive solar still is the simplest design for distilling seawater by harnessing solar energy. Although it is undeniable that solar still is a promising device to provide an additional freshwater source for global increasing water demand, low thermal efficiency along with daily distillate yield are its major disadvantages. A conventional solar still can produced 2 to 5 L/m2day. Various studies have been carried out to improve passive solar stills in terms of daily productivity, thermal efficiency, and economic effectiveness. Most of the researches that relate to the daily output improvement of passive solar still concentrates on enhancing evaporation or/and condensation processes. While the condensation process is influenced by wind velocity and characteristics of the condensed surface, the evaporation process is mainly affected by the temperature of basin water. Different parameters affect the brackish water temperature such as solar radiation, design parameters (for example water depth, insulators, basin liner absorptivity, reflectors, sun tracking system, etc). The inclined angle of the top cover is suggested to equal the latitude of the experimental place. Moreover, the decrease of water depth was obtained as a good operational parameter, however, the shallow water depth is required additional feed water for ensuring no dry spot existence. Reflectors and sun-tracking systems help solar still absorb as much solar intensity as possible. The internal reflector can enhance daily yield and efficiency of stepped solar still up to 75% and 56% respectively, whereas, passive solar still with the support of a sun-tracking system improved daily yield up to 22%. Despite large efforts to investigate the impact of the different parameters on passive solar distillation, the effect of the basin liner (including appropriate shapes and type of material), needs to be analyzed for improvement in practical utilization. The present work has reviewed the investigation of the solar still performance with various types of basin liner. The review of solar stills has been conducted critically with rectangular basin, fins basin, corrugated basin, wick type, steps shape, and cylindrical shape basin with variety of top cover shapes. The findings from this work conclude that the basin liner with a cylindrical shape had better performance in comparison with other metal types and provides higher freshwater output. Stepped type, inclined, fin absorber, and corrugated shapes had the efficient performance. Further exploration revealed that copper is the best-used material for the productivity of passive solar still.

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Section: Stepped Basin and Weir Type Basinmentioning

confidence: 99%

Influence of Various Basin Types on Performance of Passive Solar Still: A Review

Pham

Hadiyanto

et al. 2021

Int. J. Renew. Energy Dev.

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“…The results showed that the hemispherical solar still with copper, zinc and iron absorbers had an improvement in yield by 53.12%, 31.25% and 14.58%, respectively 109 when compared with the productivity of conventional hemispherical solar still. (Saadi et al 2018) (Sampathkumar et al 2013) investigated the effect of evacuated tube collector connected to solar still on 115 freshwater productivity. It was observed that the solar still with evacuated tube collector had a yield of 116 7.03kg/m 2 /day whereas the conventional solar still had a yield of 3.225 kg/m 2 /day at a depth of 4 cm.…”

Section: The Role Of Design Parameters In Productivity Enhancementmentioning

confidence: 99%

An Experimental Study on Eco-Friendly and Cost-Effective Natural Materials for Productivity Enhancemento Single Slope Solar Still

Natarajan

Suraparaju²,

Elavarasan

et al. 2021

Preprint

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The proposed research study aims to improve the productivity of solar still (SS) by using low-cost and eco-friendly materials. The aforementioned objective was achieved by enhancing the evaporation rate of seawater in the absorber basin and the condensation rate over the glass cover of the solar still. In this study, the low-cost and eco-friendly materials used for enhancing the evaporation rate in the solar still were Molasses Powder (MP), Sawdust (SD), Rise Husk (RH). In addition to these materials, Bamboo Straw (BS), Banana Leaf stem (BL), and Rice Straw (RS) were used as absorbing materials over the glass cover for enhancing the condensation rate. The experiments were carried out under similar meteorological conditions and the results of the modified solar still were compared with Conventional Solar Still (CSS). The productivities of CSS, SSMP, SSRH, SSSD, SSBS, SSBL and SSRS were about 2250 mL/m2, 2383 mL/m2, 2467 mL/m2, 3033 mL/m2, 2700 mL/m2, 2683 mL/m2, and 3367 mL/m2 , respectively. The results of the experimental investigation highlighted that the SSSD had a comparatively better evaporation rate and 34.81% higher yield than CSS. Besides, SSRS had a comparatively better condensation rate and a 51.88% higher yield than CSS. Later, the combination of sawdust (SD) and rice straw (RS) was investigated for combined enhancement of evaporation and condensation. The solar still with sawdust and rice straw (SSSDRS) showed a 62.88% improvement in productivity with 3633 mL/m2 when compared to CSS. Also, the economic analysis showed that the cost per litre (CPL) of freshwater obtained from SSSDRS was about ₹ 1.9 ($ 0.025) with a payback period of 4.4 months which was the least when compared to all the considered cases.

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“…In the third experiment integrated with a parabolic concentrator-solar tracking system, daily efficiencies were found to be 36.5%, 30.5%, and 28.5%, respectively. Saadi et al [14] proposed a new stepped solar still to improve solar productivity by producing an internal multi-tray evaporator that affects the performance of the still. The reported experimental data shows that productivity of this still is higher than that for conventional still by about 47.18-104.73%.…”

Section: List Of Symbolsmentioning

confidence: 99%

Design, Fabrication and Performance Evaluation of a Semi-Cylindrical Solar Still Working in Medina Region

AlQdah

Alharbi

et al. 2021

Arab J Sci Eng

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The exponential population growth has led to severe fresh water availability issues around the world. Saudi Arabia is one of the countries that mostly rely on desalination process to satisfy their fresh water needs in desert regions. The distillation process has become too expensive due to the sharp rise in oil prices. Renewable energy is a promising source for the water distillation process. This work aims to design, fabricate, and test a solar still for purification of salty and brackish water. A semicylindrical solar still was designed and tested under Medina climatic conditions. The semi-cylindrical solar still connected with a parabolic trough solar concentrator was supposed to enhance the system performance and the system productivity by warming up the brackish or saltwater before it was directed to the basin. To calculate system efficiency, the temperatures of water in the basin, glass outside and inside surface, inside of the still, and the ambient were measured. It was found that the average intensity of solar radiation was about 729.8W/m 2 per hour and the average system efficiency was found to be 23.38% without a parabolic trough. The system efficiency reached 29.5% by connecting the solar still with a parabolic trough. The maximum productivity of the solar still was found to be 1.8 L/h at peak time, with an average value of 0.9 L/h in May.

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Performance evaluation of a new stepped solar still under the desert climatic conditions

Cited by 84 publications

References 43 publications

Influence of Various Basin Types on Performance of Passive Solar Still: A Review

Influence of Various Basin Types on Performance of Passive Solar Still: A Review

An Experimental Study on Eco-Friendly and Cost-Effective Natural Materials for Productivity Enhancemento Single Slope Solar Still

Design, Fabrication and Performance Evaluation of a Semi-Cylindrical Solar Still Working in Medina Region

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