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Research Papers

Energy and Exergy Analyses of a New Triple-Staged Refrigeration Cycle Using Solar Heat Source

[+] Author and Article Information
Abdul Khaliq

e-mail: khaliqsb@gmail.com

Rajesh Kumar

Department of Mechanical Engineering,
Delhi Technological University,
Government of NCT of Delhi,
Bawana Road,
Delhi 110042, India

Ibrahim Dincer

Faculty of Engineering and Applied Science,
University of Ontario Institute of Technology,
2000 Simcoe Street North,
Oshawa L1H7K4 ON, Canada

Farrukh Khalid

Department of Mechanical Engineering,
Aligarh Muslim University,
Aligarh 202002,
Uttar Pradesh, India

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received March 8, 2013; final manuscript received March 14, 2013; published online July 2, 2013. Editor: Gilles Flamant.

J. Sol. Energy Eng 136(1), 011004 (Jul 02, 2013) (11 pages) Paper No: SOL-13-1080; doi: 10.1115/1.4024126 History: Received March 08, 2013; Revised March 14, 2013

In this paper, energy and exergy analyses of a new solar-driven triple-staged refrigeration cycle using Duratherm 600 oil as the heat transfer fluid are performed. The proposed cycle is an integration of absorption refrigeration cycle (ARC), ejector (EJE) refrigeration cycle (ERC), and ejector expansion Joule–Thomson (EJT) refrigeration cryogenic cycles which could produce refrigeration output of different magnitude at different temperature simultaneously. Both exergy destruction and losses in each component and hence in the overall system are determined to identify the causes and locations of the thermodynamic imperfection. Several design parameters, including the hot oil outlet temperature, refrigerant turbine inlet pressure, and the evaporator temperature of ERC and EJT cycle are also tested to evaluate their effects on energy and exergy performance. It is observed that largest contribution to cycle irreversibility comes from the central receiver and heliostat field with the heat recovery vapor generator (HRVG), condenser, and ejector of ERC itself also contributing considerably. The exergy efficiency of the solar-driven triple-staged refrigeration cycle is 4% which is much lower than its energy efficiency of 10%, respectively. The results clearly reveal that thermodynamic investigations based on energy analysis alone cannot legitimately be complete unless the exergy concept becomes a part of the analysis.

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References

Figures

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Fig. 1

Schematic diagram of solar operated triple-staged refrigeration cycle

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Fig. 1

(a) T-s diagram of solar operated triple-staged refrigeration cycle

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Fig. 2

Percentage (%) of Sun's energy distribution for triple-staged refrigeration cycle

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Fig. 3

Percentage (%) of Sun's exergy distribution in output and destruction for triple-staged refrigeration cycle

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Fig. 4

Variation of individual refrigeration output and combined refrigeration output for triple-staged refrigeration cycle with hot oil outlet temperature

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Fig. 5

Variation of energy and exergy efficiency for triple-staged refrigeration system with hot oil outlet temperature

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Fig. 6

Variation of individual refrigeration output and total refrigeration output for triple-staged refrigeration cycle with turbine inlet pressure

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Fig. 7

Variation of energy and exergy efficiency for triple-staged refrigeration cycle with turbine inlet pressure

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Fig. 8

Variation of individual refrigeration and total refrigeration output for triple-staged refrigeration cycle with ERC E1 temperature

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Fig. 9

Variation of energy and exergy efficiency for triple-staged refrigeration cycle with ERC E1 temperature

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Fig. 10

Variation of energy and exergy efficiency for triple-staged refrigeration cycle with EJT E3 temperature

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