Effect of Al2O3 nanoparticles on the performance of passive double slope solar still

Sahota, Lovedeep; Tiwari, G.N.

doi:10.1016/j.solener.2016.02.018

Cited by 233 publications

(51 citation statements)

References 26 publications

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“…In 2016, Sahota and Tiwari [23] theoretically investigated the effect of adding alumina oxide nanoparticles on the productivity of a passive double slope solar still. The analysis was done for three different mass concentrations (i.e., 0.04%, 0.08%, and 0.12%) and two values of water mass in the basin (35 and 80 kg).…”

Section: -Introductionmentioning

confidence: 99%

Nanofluids effects on the evaporation rate in a solar still equipped with a heat exchanger

et al. 2017

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In this paper, the performance of a solar still equipped with a heat exchanger using nanofluids has been studied both experimentally and theoretically through three key parameters, i.e., freshwater yield, energy efficiency and exergy efficiency. First, experiments are performed on a set-up, which is mainly composed of two flat plate solar collectors connected in series, and a solar still equipped with a heat exchanger. After heated in the collectors, the nanofluid enters the heat exchanger installed in the solar still basin to exchange heat with brackish water. The research question is to know how much the effect of nanofluids on the evaporation rate inside the solar desalination system is. The experiments are conducted for different nanoparticle volume fractions, two sizes of nanoparticles (7 and 40 nm), two depths of water in the solar still basin (4 and 8 cm), and three mass flow rates of nanofluids during various weather conditions. It is found that the weather conditions (mainly the sun radiation intensity) have a dominant influence on the solar still performance. To discover the effects of nanofluids, a mathematical model is developed and validated by experimental data at given weather conditions. The results reveal that using the heat exchanger at temperatures lower than 60 o C is not advantageous and the corresponding yield is smaller than that of solar still without the heat exchanger; although in such a case, using 2 nanofluids as the working fluid in the heat exchanger can enhance the performance indices about 10%. At higher temperatures (e.g. 70 o C), the use of heat exchanger is beneficial; however, using nanofluids instead of water can augment the performance indices marginally i.e. just around 1%. In addition, it is found that in high temperatures using SiO 2 /water nanofluids, which have a lower effective thermal conductivity than that of Cu/water nanofluids, provides higher performance indices.Keywords: Nanofluids; Solar desalination; Heat exchanger; Freshwater yield 1-IntroductionNowadays, "Nano" and "Energy" have been two hot keywords, not only in the scientific community but also in our daily life. During recent decades, researchers have attempted to apply nanotechnology to various energy and power systems such as electric generators, fuel cells, batteries, and solar cells [1][2][3][4][5]. Nanotechnology has also been implemented to enhance the heat transfer potential of common liquids like water and oil to ameliorate the efficiency of thermal systems; this can be done through adding solid nanoparticles (particles with a size of 1-100 nm) to the liquids. The mixture of nanoparticles and conventional liquids is named "nanofluid" [6].Despite some limitations such as relatively high preparation cost and stability issues, extensive attempts have been made to develop the applications of nanofluids in energy systems such as solar energy based devices [7][8][9][10][11][12][13], cooling and thermal management of electronic equipment [14,15], grinding and drilling, absorption systems, medicine...

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Section: -Introductionmentioning

confidence: 99%

Nanofluids effects on the evaporation rate in a solar still equipped with a heat exchanger

et al. 2017

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“…Sahota et al investigated the performance of double slope solar still with the use of Al 2 O 3 nanoparticle to see its effect on distillate yield. Results showed that the performance of solar still linearly increasing with increase in the concentration of nanoparticle with the base fluid.…”

Section: Introductionmentioning

confidence: 99%

“…Panchal 38 carried out the analysis of various heat storage materials in a solar still and concluded that the nocturnal distillate output of solar still improved by storage materials. Sahota et al 39 investigated the performance of double slope solar still with the use of Al 2 O 3 nanoparticle to see its effect on distillate yield. Results showed that the performance of solar still linearly increasing with increase in the concentration of nanoparticle with the base fluid.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the effect of MgO and TiO ₂ nanoparticles in stepped solar still

et al. 2019

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Summary This work aims at augmenting the amount of potable water using MgO and TiO2 in stepped solar still. Experiments were carried out for the climatic conditions of Chennai, India, with two different concentrations of nanofluids inside a stepped basin under three different cases. Results show that there is an improvement in yield of fresh water from stepped solar still by 33.18% and 41.05% using 0.1% and 0.2% volume concentration of TiO2 nanofluid, respectively, whereas the freshwater yield from stepped still with MgO nanofluids improved by 51.7% and 61.89%. Furthermore, the economic analysis revealed that the cost of potable water from the modified solar still reduced from 0.029 to 0.016 $/kg. Similarly, the useful annual energy, yearly cost per kilogram, and annual cost per kilowatt hour are significantly profitable with the use of MgO nanofluid in the stepped basin and found as 512.46 kWh, 0.025 $/kg, and 0.026 $/kWh, respectively. It is also found that the cost of potable water from the modified still significantly increases as the amount of fresh water produced is decreased with increased fabrication cost of the solar still.

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“…Recently, in order to overcome the bottleneck of the evaporation efficiency of traditional technology, some researchers tried to apply the nanotechnology to improve solar steam generation. For example, the efficiency of steam generation can be improved by dispersing some nanoparticles in water, like ZnO [20], Al2O3 [20,21], CuO [22], Au [23][24][25] and graphene [26]. The water with dispersed nanoparticles forms nanofluid, which can increases the water temperature and thereby increase the evaporation efficiency quite well [27,28].…”

Section: Introductionmentioning

confidence: 99%

Efficiency enhancement on the solar steam generation by wick materials with wrapped graphene nanoparticles

Peng

et al. 2019

Applied Thermal Engineering

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Solar steam generation technology can utilize abundant and renewable solar energy for many applications. In this work, we proposed a solar steam generator using wick material with wrapped graphene nanoparticles, and the energy efficiency can reaches up to 80%. Instead of traditional smearing method, the chemical wrapping method was used to better adhere the graphene nanoparticles on the wick materials.Through the SEM morphological results, the graphene nanoparticles are shown to be evenly wrapped across the fibres of the wick material, which have better dispersity and stability. The evaporation rate, instantaneous energy efficiency and the absorptivity of three wick materials with/without nanoparticles under different conditions were compared and analyzed. Among the three different wick materials, the flannel cloth with dense fine hairs can provide three-dimensional contact area for wrapping graphene nanoparticles and thus contribute to better evaporation.Additionally, the influence of two different reduction methods and different concentrations of graphene oxide solution on the energy efficiency was also discussed.Our work offers a simple and effective way of using nanotechnology in practical application for solar steam generation.

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Effect of Al2O3 nanoparticles on the performance of passive double slope solar still

Cited by 233 publications

References 26 publications

Nanofluids effects on the evaporation rate in a solar still equipped with a heat exchanger

Nanofluids effects on the evaporation rate in a solar still equipped with a heat exchanger

Experimental investigation on the effect of MgO and TiO ₂ nanoparticles in stepped solar still

Efficiency enhancement on the solar steam generation by wick materials with wrapped graphene nanoparticles

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Effect of Al2O3 nanoparticles on the performance of passive double slope solar still

Cited by 233 publications

References 26 publications

Nanofluids effects on the evaporation rate in a solar still equipped with a heat exchanger

Nanofluids effects on the evaporation rate in a solar still equipped with a heat exchanger

Experimental investigation on the effect of MgO and TiO 2 nanoparticles in stepped solar still

Efficiency enhancement on the solar steam generation by wick materials with wrapped graphene nanoparticles

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Product

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Experimental investigation on the effect of MgO and TiO ₂ nanoparticles in stepped solar still