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Research Papers: Micro/Nanoscale Heat Transfer

Analytical Study of Thermo-Physical Performance of Nanofluid Loaded Hybrid Double Slope Solar Still

[+] Author and Article Information
Lovedeep Sahota

Centre for Energy Studies,
Indian Institute of Technology Delhi,
Hauz Khas, New Delhi 110016, India
e-mail: love.sahota11@gmail.com

V. S. Gupta

Centre for Energy Studies,
Indian Institute of Technology Delhi,
Hauz Khas, New Delhi 110016, India

G. N. Tiwari

Centre for Energy Studies,
Indian Institute of Technology Delhi,
Hauz Khas, New Delhi 110016, India;
Bag Energy Research Society (BERS),
SODHA BERS COMPLEX,
Plot No. 51, Mahamana Nagar,
Karaundi, Varanasi 221005, UP, India

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received November 25, 2017; final manuscript received June 28, 2018; published online August 3, 2018. Assoc. Editor: Thomas Beechem.

J. Heat Transfer 140(11), 112404 (Aug 03, 2018) (14 pages) Paper No: HT-17-1705; doi: 10.1115/1.4040782 History: Received November 25, 2017; Revised June 28, 2018

In the present paper, efforts has been made to study the thermophysical performance (properties) of N photovoltaic thermal flat plate collectors coupled with double slope solar still (N-PVT-FPC-DSSS) and operating with helically coiled heat exchanger. The analysis has been performed for the optimized concentration of NPs (Al2O3 0.107%; TiO2 0.093%; and CuO 0.131%) and optimized basin fluid (base fluid/nanofluid) mass (50 kg) for different weather conditions of the month May (New Delhi). The Nusselt number (Nu) and Rayleigh number (Ra) are functions of thermophysical properties of nanofluids and strongly influence the natural convective heat transfer coefficient in the solar still. Therefore, these numbers have also been investigated for base fluid and Al2O3, TiO2, and CuO–water-based nanofluids in detail. Significant enhancement in natural convective heat transfer coefficient (Al2O3 67.03%; TiO2 63.56%; and CuO 71.23%) and Nusselt number (Al2O3 119.72%; TiO2 98.64%; CuO 151.62%) has been observed. The monthly productivity of the hybrid system found to be higher by using nanofluids (320.77 kg TiO2; 338.23 kg Al2O3, and 355.46 CuO) as expected from the heat transfer results. Moreover, the comparative study between the proposed hybrid system and passive DSSS has been carried out.

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Figures

Grahic Jump Location
Fig. 1

Systematic view of hybrid double slope solar still integrated with helically coiled heat exchanger and loaded with metallic NPs

Grahic Jump Location
Fig. 2

Hourly variation of solar intensity and ambient temperature of a clear sky day of all different weather conditions of the month May (New Delhi) for the (a) east side (DSSS) (b) west side (DSSS), and (c) flat plate solar collector

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Fig. 3

Variation of Nusselt number with fluid temperature (BF/NF) of hybrid DSSS

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Fig. 4

Variation of Rayleigh number with fluid temperature (BF/NF) of hybrid DSSS

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Fig. 5

Variation of Nusselt number (maximum value) with concentration of Al2O3, TiO2, and CuO metallic NPs

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Fig. 6

Hourly variation of internal (evaporative, radiative, and convective) HTC of the east side of hybrid DSSS loaded with (a) base fluid (water), (b) Al2O3, (c) TiO2 and (d) CuO–water-based nanofluid

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Fig. 7

Hourly variation of internal (evaporative, radiative, and convective) HTC of the west side of hybrid DSSS loaded with (a) base fluid (water), (b) Al2O3, (c) TiO2, and (d) CuO–water-based nanofluid

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Fig. 8

Variation of evaporative and natural convective HTC with Nusselt number for (a) base fluid (water), (b) TiO2, (c) Al2O3, and (d) CuO–water-based nanofluid loaded in hybrid DSSS

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Fig. 9

Variation of evaporative, convective and radiative energy fraction with temperature of the fluid (BF/NF) for the west side of hybrid DSSS loaded with (a) base fluid (water), (b) Al2O3, (c) TiO2, and (d) CuO–water-based nanofluid

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