Numerical performance evaluation of tubular solar still with different geometries of water basin

Subhani, Shaik; Kumar, R.

doi:10.5004/dwt.2020.25968

Cited by 6 publications

(3 citation statements)

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“…A good agreement between theoretical and 2D-CFD simulation for solar still was reported in the findings [22]. Subhani and Senthil Kumar [23] also reported that the change in basin shape results in an increased heat transfer rate compared to conventional basins by up to 31.4 %. Although, the previous study on solar stills has been done by enhancing their performance of it by introducing an extra baffle in it or including the solar radiation concentrators over it.…”

Section: Introductionsupporting

confidence: 63%

“…The following general governing equations for heat transfer and fluid flow used for 2-Dimensional applications following earlier reports [23,24] are given after applying the necessary assumptions (Eqs. ( 1) to ( 4)) with considered pressure change, p, change in velocity in x-direction, u and y-direction, v, respectively.…”

Section: Governing Equations Boundary Conditions and Solution Proceduresmentioning

confidence: 99%

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Convection heat transfer of stepped basin single slope solar still: A numerical investigation

Varun

Subhani

Kumar

2023

JMES

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Solar-powered desalination is a quick and easy way to make drinking water. Numerous solar distillation systems have been investigated for various parameter modifications based on local resource availability. In this work, a solar still with a modified stepped basin is investigated to raise the rate of internal evaporation and, therefore the output yield of the solar still. Stepped basin solar stills are taken into consideration for the study since they are very effective because the water's surface exposure to radiation is greater. Thus, increasing the rate of internal water evaporation enhances the rate of convective heat transfer between the evaporating and condensing surfaces, leading to improved and consistent output. The two-dimensional stepped basin single slope solar still was investigated and contrasted with the traditional single slope still in terms of heat transfer and fluid dynamics. To optimize the configuration for better performance in various types of climatic and operational circumstances that imitate the scenario of daily life, design elements such as the number of steps and the different heights of the basin are also taken into account. Each step was added with far more success than the one before it, up until the length was reduced to 1.16% of the entire shorter length. This numerical study enables us to draw the conclusion that the rise in natural heat transfer rate with the addition of steps is mostly caused by the increased surface area and the inherently restrictive nature within the domain. Additionally, with an increase in Rayleigh number, Ra, the gradient variations of the traditional single slope solar still overheat transfer features have been greatly regulated and successfully raised for the modified stepped basin Solar still.

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Section: Introductionsupporting

confidence: 63%

Section: Governing Equations Boundary Conditions and Solution Proceduresmentioning

confidence: 99%

Convection heat transfer of stepped basin single slope solar still: A numerical investigation

Varun

Subhani

Kumar

2023

JMES

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“…13 in aspect ratio and glass and water temperatures augment buoyant force, which improves energy exchange between the flow and the walls, leading to greater entropy generation. Subhani and Senthil Kumar 16 studied the effects of various water basin geometries in tubular solar still on its productivity. A conventional solar still with a single-slope and modified tubular solar still of the same area with varied water basin heights were simulated.…”

Section: Different Methods and Its Working Principlementioning

confidence: 99%

Enhancing performance of solar stills ‐ A review

Sinha,

Venkatesh,

Kumar

2024

Env Prog and Sustain Energy

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Solar stills can be an easy and environmentally viable solution in today's world, where a lack of fresh water sources is a major challenge. Solar stills, on the other hand, aren't economically viable due to their poor efficiency. It has been the subject of several studies to improve its efficiency and output. The goal of this review article is to understand and summarize recent studies conducted to improve the efficiency and commercial viability of solar stills. It focuses on using experimental and numerical techniques to manipulate different parameters that affect freshwater production in stills in order to arrive at a suitable condition where the efficiency and productivity of the solar still are maximized. Effects of modifications such as addition of baffles, fans, fins, phase change material (PCM), etc., and its consequent influence on freshwater production rate are presented in this article. Fins, for example, improved the efficiency of solar still by about 40% and productivity by about 16%. PCMs too increased the productivity rate by around 50%–90% depending on the type of PCM used. Baffles were found to be more effective when they were mounted closer to the front wall of the solar still. The findings and conclusions of all the studies are summarized. This review article aims to provide an overview of solar stills and the various modifications that may be done to improve their overall efficiency.

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