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Research Papers

Techno-Economics of Cogeneration Approaches for Combined Power and Desalination From Concentrated Solar Power

[+] Author and Article Information
Andrey Gunawan, Daniel Moreno, Akanksha K. Menon, Marta C. Hatzell

The G. W. Woodruff School of
Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332

Richard A. Simmons

Strategic Energy Institute,
Georgia Institute of Technology,
Atlanta, GA 30318

Megan W. Haynes

School of Civil and Environmental Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332

Shannon K. Yee

Mem. ASME
The G. W. Woodruff School of
Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332
e-mail: shannon.yee@me.gatech.edu

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 August 24, 2018; final manuscript received November 12, 2018; published online January 8, 2019. Guest Editors: Tatsuya Kodama, Christian Sattler, Nathan Siegel, Ellen Stechel.

J. Sol. Energy Eng 141(2), 021004 (Jan 08, 2019) (7 pages) Paper No: SOL-18-1396; doi: 10.1115/1.4042061 History: Received August 24, 2018; Revised November 12, 2018

For many decades, integration of concentrated solar power (CSP) and desalination relied solely on the use of conventional steam Rankine cycles with thermally based desalination technologies. However, CSP research focus is shifting toward the use of supercritical CO2 Brayton cycles due to the significant improvement in thermal efficiencies. Here, we present a techno-economic study that compares the generated power and freshwater produced from a CSP system operated with a Rankine and Brayton cycle. Such a study facilitates co-analysis of the costs of producing both electricity and water among the other trade-off assessments. To minimize the levelized cost of water (LCOW), a desalination facility utilizing multi-effect distillation with thermal vapor compression (MED/TVC) instead of multistage flash distillation (MSF) is most suitable. The techno-economic analysis reveals that in areas where water production is crucial to be optimized, although levelized cost of electricity (LCOE) values are lowest for wet-cooled recompression closed Brayton cycle (RCBR) with MSF (12.1 cents/kWhe) and MED/TVC (12.4 cents/kWhe), there is only a 0.35 cents/kWhe increase for dry-cooled RCBR with MED/TVC to a cost of 12.8 cents/kWhe. This suggests that the best candidate for optimizing water production while minimizing both LCOW and LCOE is dry-cooled RCBR with MED/TVC desalination.

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Figures

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Fig. 1

Schematics of (a) simple ideal Rankine cycle, (b) SCBC, and (c) CSP with RCBR for power generation

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Fig. 2

Schematics of thermal desalination systems: (a) multistage flash and (b) MED with TVC

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Fig. 3

Schematic of the cogeneration system showing the power block and thermal desalination unit

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Fig. 4

Average LCOW for power cycles coupled with various desalination processes based on facility size of 100 MWe and 42,000 m3/day of freshwater production. Error bars represent minimum and maximum values of LCOW based on the minimum and maximum possible volumes of water produced daily, between 9000 and 42,000 m3/day, which is as a function of the thermal energy input (Q¯consumed).

Grahic Jump Location
Fig. 5

Maximum calculated LCOW and LCOE

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Fig. 6

Minimum calculated LCOW and LCOE

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