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Research Papers

Analytical Characteristic Equation of N Identical Evacuated Tubular Collectors Integrated Double Slope Solar Still

[+] Author and Article Information
Desh B. Singh

Centre for Energy Studies,
Indian Institute of Technology Delhi,
Haus Khas,
New Delhi 110016, India
e-mail: dbsiit76@gmail.com

Gopal N. Tiwari

Bag Energy Research Society,
Sodha Bers Complex, Plot No. 51,
Mahamana Nagar, Karaudi,
Varanasi 221005, Uttar Pradesh, India
e-mail: gntiwari@ces.iitd.ernet.in

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received February 7, 2017; final manuscript received May 1, 2017; published online July 18, 2017. Assoc. Editor: Carlos F. M. Coimbra.

J. Sol. Energy Eng 139(5), 051003 (Jul 18, 2017) (11 pages) Paper No: SOL-17-1050; doi: 10.1115/1.4036855 History: Received February 07, 2017; Revised May 01, 2017

In this paper, analytical expression for characteristic equation of double slope solar still (DS) included with series connected N identical evacuated tubular collectors (N-ETC-DS) has been developed. The derivation is based on fundamental energy balance equations for various components of the proposed system. The analytical result of the proposed N-ETC-DS has been compared with results reported by earlier researchers for the same basin area under similar climatic condition. It has been concluded that daily energy efficiency is higher by 23.90%, 26.45%, and 42.65% for N-ETC-DS than N identical partially covered photovoltaic thermal (PVT) compound parabolic concentrator collectors (CPC) integrated double slope solar still, N identical partially covered PVT flat plate collectors (FPC) integrated double slope solar still, and conventional double slope solar still (CDS), respectively, at 0.14 m water depth under optimized condition. Moreover, daily yield, exergy, energy and exergy efficiency have been computed.

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Figures

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Fig. 1

Cross-sectional view of ETC

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Fig. 2

Schematic diagram of the proposed double slope solar still incorporated with N identical ETC connected in series (N-ETC-DS)

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Fig. 3

Hourly variation of radiation on horizontal surface and ambient air temperature for a typical day in the month of June

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Fig. 4

Hourly variation of daily yield of N-ETC-DS for a typical day in the month of June

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Fig. 5

Variation of daily yield with N for N-ETC-DS for a typical day in the month of June

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Fig. 6

Variation of daily yield with types of system for a typical day in the month of June

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Fig. 10

Hourly variation of various temperatures of N-ETC-DS for a typical day in the month of June

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Fig. 11

Hourly variation of heat transfer coefficient and yield of N-ETC-DS for a typical day in the month of June

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Fig. 7

Variation of daily exergy gain and daily energy output with types of system for a typical day in the month of June

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Fig. 8

Variation of daily exergy efficiency and daily energy efficiency with types of system for a typical day in the month of June

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Fig. 9

Variation of TfoN,max with N for given m˙f of collector fluid of N-ETC-DS for a typical day in the month of June

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