Experimental study on enhancing the yield from stepped solar still coated using fumed silica nanoparticle in black paint

Sathyamurthy, Ravishankar; Kabeel, A.E.; Bhaskaran, Madhu; Devarajan, Mageshbabu; Sharshir, Swellam W.; Manokar, A. Muthu

doi:10.1016/j.matlet.2020.127873

Cited by 100 publications

(22 citation statements)

References 7 publications

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“…The average temperature of the water and absorber increased by 10.2-12.3% by adding the optimized concentration of nanoparticles of 20% with black paint. Results also concluded that the concentration increase from 10 to 40%, with 10% increment leading to a 27.2, 34.2, 18.3, and 18.4% increase in efficiency, respectively, compared to that of ordinary black paint [17]. Similarly, one of the research groups developed two similar solar stills with varying color of paints other than black.…”

Section: Introductionmentioning

confidence: 86%

Silicon Particles/Black Paint Coating for Performance Enhancement of Solar Absorbers

et al. 2021

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The availability of fresh drinkable water and water security is becoming a global challenge for sustainable development. In this regard, solar stills, due to their ease in operation, installation, and utilization of direct sunlight (as thermal energy), promise a better and sustainable future technology for water security in urban and remote areas. The major issue is its low distillate productivity, which limits its widespread commercialization. In this study, the effect of silicon (Si) particles is examined to improve the absorber surface temperature of the solar still absorber plate, which is the major component for increased distillate yield. Various weight percentages of Si particles were introduced in paint and coated on the aluminum absorber surface. Extensive indoor (using a self-made halogen light-based solar simulator) and outdoor testing were conducted to optimize the concentration. The coatings with 15 wt % Si in the paint exhibited the highest increase in temperature, namely, 98.5 °C under indoor controlled conditions at 1000 W/m2 irradiation, which is 65.81% higher than a bare aluminum plate and 37.09% higher compared to a black paint-coated aluminum plate. On the other hand, coatings with 10 wt % Si reached up to 73.2 °C under uncontrolled outdoor conditions compared to 68.8 °C for the black paint-coated aluminum plate. A further increase in concentration did not improve the surface temperature, which was due to an excessive increase in thermal conductivity and high convective heat losses.

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Section: Introductionmentioning

confidence: 86%

Silicon Particles/Black Paint Coating for Performance Enhancement of Solar Absorbers

et al. 2021

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“…It was found that the solar still with graphite and CuO nanofluids had an augmented output of 41.18% and 32.35%, respectively, compared to CSS. (Sathyamurthy et al 2020) studied the influence of fumed silica nano-coating with different concentrations varying from 10% to 40% on the freshwater yield of solar still. It was observed that the solar still with a modified coating at 20% concentration had the 182 highest improvement in the yield by 34.2% compared to CSS.…”

Section: Productivity Enhancement By Increasing Wet Surface Areamentioning

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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“…Another experimental study investigated the fumed SiO 2 nanoparticle in black paint at varying concentrations (i.e., 10-40%) which is coated on the absorber plate of stepped solar still for augmenting the freshwater yield. A 10.2 and 12.3% increase in the temperature of water vapor and absorber plate, respectively, has been reported by adding the optimized concentration, i.e., 20%, in black paint (Sathyamurthy et al, 2020). In another study, it has been proven that the solar still interior coated with white-colored paint improved the distillate yield by 6.8% compared to conventionally used black paint (Tenthani et al, 2012).…”

Section: Introductionmentioning

confidence: 97%

A Systematic Indoor and Outdoor Study of the Effect of Particle Size and Concentration of TiO2 in Improving Solar Absorption for Solar Still Application

et al. 2021

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Solar light absorber surface is probably one of the most important components in solar still that dictates the distillate yield. In this work, a systematic study is conducted to investigate the effect of particle size and concentration of titanium oxide (TiO2) in black paint in increasing the solar still absorber surface temperature. The various available particle sizes, i.e., 20, 150, and 400 nm, are mixed in black paint with varying concentrations and are applied on the absorber plate. XRD is used for phase identification of as-received powders. UV-Vis spectroscopy is used to examine light absorption properties. Finally, extensive indoor testing (using an improvised solar simulator) and outdoor testing are conducted to optimize the concentration. An increase in surface temperature is observed with the introduction of TiO2 nanoparticles in black paint. Furthermore, the increase in particle size leads to an increase in temperature. The highest surface temperatures of 104.86°C, 105.42°C, and 106.32°C are recorded for specimens with particles sizes 20 nm (at 15 wt% concentration), 150 nm (at 10 wt% concentration), and 400 nm (at 7 wt% concentration), respectively. Furthermore, the highest temperature of 69.69°C is recorded for TiO2-400 nm specimens under outdoor conditions, which is 15.97% higher than that of the bare aluminum plate. The increase in surface temperature may be due to high UV absorption. Moreover, an increase in particle size leads to high light-scattering ability, further improving the light-harvesting ability.

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Experimental study on enhancing the yield from stepped solar still coated using fumed silica nanoparticle in black paint

Cited by 100 publications

References 7 publications

Silicon Particles/Black Paint Coating for Performance Enhancement of Solar Absorbers

Silicon Particles/Black Paint Coating for Performance Enhancement of Solar Absorbers

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

A Systematic Indoor and Outdoor Study of the Effect of Particle Size and Concentration of TiO2 in Improving Solar Absorption for Solar Still Application

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