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Research Papers

Exergy Optimization of a Double-Exposure Solar Cooker by Response Surface Method

[+] Author and Article Information
Hossein Zamani

Research Institute of Food Science
and Technology,
Mashhad 91851-76933, Iran
e-mail: h.zamani@rifst.ac.ir

Omid Mahian

Young Researchers and Elite Club,
Mashhad Branch,
Islamic Azad University,
Mashhad 91871-47578, Iran

Iman Rashidi

Department of Mechanical Engineering,
Quchan University of Advanced Technology,
Quchan 94771-67335, Iran

Giulio Lorenzini

Department of Industrial Engineering,
University of Parma,
Parco Area delle Scienze, 181/A,
Parma 43124, Italy

Somchai Wongwises

Fluid Mechanics, Thermal Engineering and
Multiphase Flow Research Laboratory (FUTURE),
Department of Mechanical Engineering,
Faculty of Engineering,
King Mongkut's University
of Technology Thonburi,
Bangmod, Bangkok 10140, Thailand

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received March 16, 2016; final manuscript received July 26, 2016; published online September 20, 2016. Assoc. Editor: Ali J. Chamkha.

J. Thermal Sci. Eng. Appl 9(1), 011003 (Sep 20, 2016) (7 pages) Paper No: TSEA-16-1068; doi: 10.1115/1.4034340 History: Received March 16, 2016; Revised July 26, 2016

The purpose of this study was to optimize the performance of a double-exposure solar cooker based on exergy efficiency. Two similar solar cookers with variable parabolic mirror position were used for this experimental research. The system's exergy depends on many variables, which were kept fixed with the exception of the mirror position and operation time. The mathematical model of exergy efficiency was obtained based on the experimental variables, which could be used to optimize the mirror positions at any time. As a result, a new system with a variable mirror on a parabolic curve was developed, which can yield up to 30% increased mean exergy efficiency. Validation of the results was carried out by both the variance analysis test and comparing with the experimental data. The experiments were carried out in Mashhad, Iran, at 37 latitude, 54 longitude, and a height of 985 m above sea level.

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Figures

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Fig. 1

The solar cookers prepared for the experiments

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Fig. 2

The schematic plan of the experimental setup for different positions of mirrors: (a) position 1, (b) position 2, and (c) position 3

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Fig. 3

The proposed plan for the experiments; the experiments were conducted from Sept. 2 to 4, 2014, with two similar solar cookers

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Fig. 4

The response surface of the exergy efficiency based on the time and position of the parabolic mirror

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Fig. 5

Exergy efficiency of the solar cooker comparison with respect to the position of the parabolic mirror

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Fig. 6

Energy efficiency of solar cooker comparison with respect to the position of the parabolic mirror

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Fig. 7

Comparison of the mathematical and experimental amount of exergy efficiency

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