Improving the performance of solar still by using nanofluids and providing vacuum

Kabeel, A.E.; Omara, Z.M.; Essa, F.A.

doi:10.1016/j.enconman.2014.05.050

Cited by 211 publications

(48 citation statements)

References 22 publications

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“…Kabeel et al [19] experimentally investigated the effects of using a fan as well as adding copper oxide and aluminum oxide based nanofluids into the basin on the productivity of a conventional solar still. For a mass concentration of 0.2% and the use of a fan, it was found that using copper oxide, and aluminum oxide nanofluids increased the productivity by 134% and 125%, respectively.…”

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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“…Performance of modified solar still with cuprous oxide nanoparticle (0.12% weight concentration) mixed in basin water was compared with the conventional solar still. This concentration has been used by Kabeel et al (2014b). The sprinkler was used to flow water at ambient temperature over the glass surface from period of 0800 to 1600 hours with the flow rate of 0.0001 kg/s.…”

Section: Methodsmentioning

confidence: 99%

“…An improvement of 166% in water productivity has been recorded in solar still integrated with external condenser. Kabeel et al (2014b) have studied the effect of various nanoparticles on the performance of the solar still. The effect of nanoparticle concentration 0.008 and 0.12% by weight of water filled in the solar still basin on the performance of the solar still was significantly.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Modified Solar Still Using Nanoparticles and Water Sprinkler Attachment

Gupta¹,

Kumar

Baredar

2017

Front. Mater.

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The experimental investigation has been done in the month of April 2015 for climate condition of Jabalpur, Madhya Pradesh, India (latitude 23°18 ′ N; longitude 79°95 ′ E) during full day, 0600 a.m. to 0600 p.m. The performance of the solar still with modification of water flow over the glass cover (sprinkler attachment) and nanoparticles (cuprous oxide) in basin water has been observed, recorded, and compared with conventional still. It has been found that the collection of pure water in modified solar sill was 4,000 ml/(m 2 -day) as compared to 2,900 ml/(m 2 -day) in conventional solar still. The efficiency of 34 and 22%has been obtained for modified solar still and conventional still, respectively. With design amendments, increase in overall effectiveness was found to be 54.54%. The computed cost of pure water produced in modified still is expected to (INR) Rs. 0.98/l, in view of 12-year life of the solar still.

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“…Other contributions discussed the use of the high solar radiative absorption of nanofluids for direct steam production [172][173][174][175][176]. To the authors knowledge however, no full scale (see Fig.…”

Section: Solar Thermal Applicationsmentioning

confidence: 99%

Nanofluids revisited

Eggers

Kabelac

2016

Applied Thermal Engineering

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h i g h l i g h t s Thermophysical properties bring nanofluids into various engineering applications. Quantity of variable parameters hinder comprehensive equations, e.g. for viscosity. Coordinated research can help to overcome debates about thermophysical properties. Missing experience for nanofluids in large scale plants. Lack of studies about high pressure/temperature applications and long term behavior. a b s t r a c tIn the roughly two decades from the first publication until today, nanofluids have found their way into various research fields. To-date published documents range from basic research to high-tech applications. This contribution aims at outlining current fields of research regarding nanofluid research. These range from fundamental property data studies presented in the first section to a listing of numerous applications of different fields of engineering. It is shown that nanofluid science pushes increasingly into the scientific world providing plenty of new questions and challenges.

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Improving the performance of solar still by using nanofluids and providing vacuum

Cited by 211 publications

References 22 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 Modified Solar Still Using Nanoparticles and Water Sprinkler Attachment

Nanofluids revisited

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