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Research Papers

Transient Energy and Exergy Analyses of a Solar Based Integrated System

[+] Author and Article Information
M. Rabbani

Faculty of Engineering and Applied Science,
University of Ontario Institute of Technology,
2000 Simcoe Street North,
Oshawa, ON L1H 7K4, Canada
e-mail: musharaf.rabbani@uoit.ca

T. A. H. Ratlamwala

Faculty of Engineering and Applied Science,
University of Ontario Institute of Technology,
2000 Simcoe Street North,
Oshawa, ON L1H 7K4, Canada
e-mail: tahir.ratlamwala@uoit.ca

I. Dincer

Faculty of Engineering and Applied Science,
University of Ontario Institute of Technology,
2000 Simcoe Street North,
Oshawa, ON L1H 7K4, Canada
e-mail: ibrahim.dincer@uoit.ca

1Present address: SZABIST, 90 and 100 Clifton Campus, Karachi, Sindh, Pakistan.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received December 2, 2013; final manuscript received June 8, 2014; published online August 25, 2014. Editor: Gilles Flamant.

J. Sol. Energy Eng 137(1), 011010 (Aug 25, 2014) (8 pages) Paper No: SOL-13-1354; doi: 10.1115/1.4028072 History: Received December 02, 2013; Revised June 08, 2014

The present study focuses on transient energy and exergy analyses of an integrated heliostat field, gas-turbine cycle and organic Rankine cycle system capable of generating power and heat in a carbon-free manner. A parametric study is carried out to ascertain the effect of varying the exit temperature of salt and the pressure ratio (PR) on the net work output, rate of heat lost from the receiver, and energy and exergy efficiencies for 365 days of the year and from 10:00 am to 2:00 pm. The results are obtained for the city of Toronto, Canada and indicate that the net work output increases from 1481 to 3339 kW with a rise in the exit salt temperature from 1200 to 1600 K. The energy and exergy efficiencies of the integrated system vary from 0.72 to 0.78 and 0.36 to 0.46, respectively, with a rise in the exit salt temperature. The energy and exergy efficiencies vary from 0.68 to 0.73 and 0.35 to 0.39, respectively, with an increase in the PR from 10 to 20.

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Figures

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Fig. 1

Schematic diagram of an integrated system

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Fig. 2

Effect of increase in the exit temperature of molten salt from the receiver and day of the year on the rate of heat lost from the receiver (a) at 10:00 am, (b) at 12:00 pm, and (c) at 2:00 pm

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Fig. 3

Effect of increase in the exit temperature of molten salt from the receiver and day of the year on the net power generated by the integrated system (a) at 10:00 am, (b) at 12:00 pm, and (c) at 2:00 pm

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Fig. 4

Effect of increase in the exit temperature of molten salt from the receiver and day of the year on (a) the energy efficiency and (b) the exergy efficiency of the integrated system at 12:00 pm

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Fig. 5

Effect of increase in the exit temperature of molten salt from the receiver on the energy and exergy efficiencies of the integrated system on 180th day of the year and at 12:00 pm

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Fig. 6

Effect of increase in the PR and day of the year on the mass flow rate of the Rankine cycle (a) at 10:00 am, (b) at 12:00 pm, and (c) at 2:00 pm

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Fig. 7

Effect of increase in the PR and day of the year on the net work output from the integrated system (a) at 10:00 am, (b) at 12:00 pm, and (c) at 2:00 pm

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Fig. 8

Effect of increase in the PR and day of the year on (a) the energy efficiency and (b) the exergy efficiency of the integrated system at 12:00 pm

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Fig. 9

Effect of increase in the PR on the energy and exergy efficiencies of the integrated system on 180th day of the year at 12:00 pm

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