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Research Papers

Exergy Analysis of a Flat Plate Solar Collector With Grooved Absorber Tube Configuration Using Aqueous ZnO–Ethylene Glycol

[+] Author and Article Information
Yash Kashyap

School of Mechanical Engineering,
Vellore Institute of Technology,
Vellore 632014, Tamil Nadu, India
e-mail: ykashyap.2102@gmail.com

Apurva Singh

School of Mechanical Engineering,
Vellore Institute of Technology,
Vellore 632014, Tamil Nadu, India
e-mail: singhapurva185.as@gmail.com

Y. Raja Sekhar

School of Mechanical Engineering,
Vellore Institute of Technology,
Vellore 632014, Tamil Nadu, India
e-mail: rajasekhar.y@vit.ac.in

1Corresponding author.

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 March 12, 2018; final manuscript received June 10, 2018; published online July 9, 2018. Assoc. Editor: Gerardo Diaz.

J. Sol. Energy Eng 140(6), 061011 (Jul 09, 2018) (10 pages) Paper No: SOL-18-1113; doi: 10.1115/1.4040582 History: Received March 12, 2018; Revised June 10, 2018

In this study, the exergetic performance of a flat plate solar collector (FPSC) setup with ZnO-based ethylene glycol (EG)/water nanofluid as a working fluid has been evaluated against that of EG/water. As a passive means to augment the rate of heat transfer, internally grooved tubes of two different pitches (e = 0.43 and e = 0.44) have been examined and compared against the performance of plain tube. The mass flow rate was fixed at 0.015 kg/s and the volume fraction of ZnO nanoparticles is ф = 0.02% v/v. The results indicate an enhancement in exergy efficiency of 44.61% when using the grooved tube (e = 0.44) against plain tube without the nanofluid and 39.17% when nanofluid is used. Using the nanofluid enhanced the exergy efficiency of the FPSC by a maximum of 73.81%. Maximum exergy efficiency obtained was 5.95% for grooved tube (e = 0.44) with nanofluid as working fluid and is in good agreement with previous literature. Exergy destruction/irreversibility due to temperature differences and heat flow within the system has been reported. Sun-collector temperature difference accounts for nearly 86–94% of the irreversibility. The results for thermal efficiency of this experimental setup have been published and summarized in this study for reference.

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Figures

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Fig. 1

Variation of overall heat loss coefficient UL with tube configuration and working fluid

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Fig. 2

Exergy efficiency (%) versus solar flux (W/m2) variation with respect to time of day (h)—case 1

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Fig. 3

Exergy efficiency (%) versus solar flux variation (W/m2) with respect to time of day (h)—case 2

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Fig. 4

Reduced temperature parameter versus exergy efficiency (%)—case 1: plain tube

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Fig. 5

Reduced temperature parameter versus exergy efficiency (%)—case 2: plain tube

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Fig. 6

Enhancement in exergy efficiency using grooved tubes against plain tube—case 1 (a) and case 2 (b)

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Fig. 7

Enhancement in exergy efficiency using 0.02% v/v ZnO-based nanofluid against 50% aq. EG soln. base fluid for each collector tube configuration

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Fig. 8

Exergy destruction corresponding to maximum exergy efficiency for case 1 (a) and case 2 (b)

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Fig. 9

Exergy destruction due to leakage (W) versus plate temperature (K)—case 1: grooved tube 1

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Fig. 10

Exergy destruction due to leakage (W) versus plate temperature (K)—case 2: grooved tube 1

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