Effect of nanofluids on the performance of passive double slope solar still: A comparative study using characteristic curve

Sahota, Lovedeep; Tiwari, G.N.

doi:10.1016/j.desal.2016.02.039

Cited by 169 publications

(33 citation statements)

References 43 publications

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“…They found that the productivity was increased by 12.2% and 8.4% for water masses of 35 and 80 kg, respectively. Later, Sahota and Tiwari [24] modeled a double slope solar still using three different inorganic based nanofluids including alumina oxide, titanium oxide, and copper oxide at a mass concentration of 0.25%. They found that the thermal and exergy efficiencies of the solar still were maximized by using alumina oxide.…”

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 and Tiwari [55,56] repeated this analysis by considering three nanoparticles containing Al2O3, CuO, and TiO2 nanoparticles. Figure 10 discloses the productivities of double slope solar still enhanced by different nanoparticles used by Sahota and Tiwari [55] for the east and west sides of the system. The nanoparticle concentration and water mass are 0.25% and 35kg, respectively.…”

Section: Solar Still Enhanced Only With Nanoparticlementioning

confidence: 99%

A concise review on the role of nanoparticles upon the productivity of solar desalination systems

Rashidi

Karimi

Mahian

et al. 2018

J Therm Anal Calorim

138

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In recent years, nanofluids have been widely used to improve the performance of various energy systems due to their favourable thermo-physical and optical characteristics. In particular, solar distillation systems, as an affordable and reliable technique to provide freshwater, have benefited from nanofluid technology. This article performs a review of literature on the implementation of nanofluid technology in active and passive solar distillation systems. The progress made and the existing challenges are discussed and some conclusions and suggestions are made for future research. The review indicates that the daily productivities of solar distillation systems enhance by using nanofluid and increasing the volume fraction of nanoparticles. However, long-term operational stability and life cycle assessment remain critical issues. These factors should be considered for future research in this field.

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“…Solar still is the traditional method used in producing portable water using renewable energy as the source. Owing to its lower yield several other methods were employed in improving the yield of fresh water . Different review articles have been studied .…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the effect of photovoltaic panel partially and fully submerged in water

Madhu

Esakki

Kabeel

et al. 2019

Heat Trans. Asian Res.

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This study presents an experimental analysis of improving the thermal, electrical efficiency, and yield of a conventional solar still (CSS). The photovoltaic (PV) efficiency decreases with increase in water depth inside the basin while the still efficiency is higher in the case of fully submerged condition. The maximum water production was about 8 kg/m 2 /day with PV under fully submerged condition; and during off-shine hours the still efficiency was higher when compared with the partially submerged condition. Similarly, with a decrease in water temperature the panel efficiency is increases. The maximum hourly water production with and without the PV was found to be 1.3 and 0.45 kg/m 2 , respectively. The main outcome of this study is that this mechanism can be used in isolated locations where there is a scarcity of current and distilled water. K E Y W O R D S efficiency, electrical, photovoltaic panel, solar still, water depth, yield Heat Transfer-Asian Res. 2019;48:1709-1721.wileyonlinelibrary.com/journal/htj

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Effect of nanofluids on the performance of passive double slope solar still: A comparative study using characteristic curve

Cited by 169 publications

References 43 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

A concise review on the role of nanoparticles upon the productivity of solar desalination systems

Experimental investigation on the effect of photovoltaic panel partially and fully submerged in water

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