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Exergetic analysis of various types of geothermal power plants

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  • Yari, Mortaza

Abstract

Based on available surveys, it has been shown that Iran has substantial geothermal potential in the north and north-western provinces, where in some places the temperature reaches 240°C. In order to better exploit these renewable resources, it is necessary to study this area. Thus, the aim of this paper is a comparative study of the different geothermal power plant concepts, based on the exergy analysis for high-temperature geothermal resources. The considered cycles for this study are a binary geothermal power plant using a simple organic Rankine cycle (ORC), a binary geothermal power plant using an ORC with an internal heat exchanger (IHE), a binary cycle with a regenerative ORC, a binary cycle with a regenerative ORC with an IHE, a single-flash geothermal power plant, a double-flash geothermal power plant and a combined flash-binary power plant. With respect to each cycle, a thermodynamic model had to be developed. Model validation was undertaken using available data from the literature. Based on the exergy analysis, a comparative study was done to clarify the best cycle configuration. The performance of each cycle has been discussed in terms of the second-law efficiency, exergy destruction rate, and first-law efficiency. Comparisons between the different geothermal power plant concepts as well as many approaches to define efficiencies have been presented. The maximum first-law efficiency was found to be related to the ORC with an IHE with R123 as the working fluid and was calculated to be 7.65%. In contrast, the first-law efficiency based on the energy input into the ORC revealed that the binary cycle with the regenerative ORC with an IHE and R123 as the working fluid has the highest efficiency (15.35%). Also, the maximum first-law efficiency was shown to be given by the flash-binary with R123 as the working fluid and was calculated to be 11.81%.

Suggested Citation

  • Yari, Mortaza, 2010. "Exergetic analysis of various types of geothermal power plants," Renewable Energy, Elsevier, vol. 35(1), pages 112-121.
    • Handle: RePEc:eee:renene:v:35:y:2010:i:1:p:112-121
    DOI: 10.1016/j.renene.2009.07.023
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    References listed on IDEAS

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    1. Madhawa Hettiarachchi, H.D. & Golubovic, Mihajlo & Worek, William M. & Ikegami, Yasuyuki, 2007. "Optimum design criteria for an Organic Rankine cycle using low-temperature geothermal heat sources," Energy, Elsevier, vol. 32(9), pages 1698-1706.
    2. Saleh, Bahaa & Koglbauer, Gerald & Wendland, Martin & Fischer, Johann, 2007. "Working fluids for low-temperature organic Rankine cycles," Energy, Elsevier, vol. 32(7), pages 1210-1221.
    3. Kanoglu, Mehmet & Bolatturk, Ali, 2008. "Performance and parametric investigation of a binary geothermal power plant by exergy," Renewable Energy, Elsevier, vol. 33(11), pages 2366-2374.
    4. Kanoglu, Mehmet & Dincer, Ibrahim & Rosen, Marc A., 2007. "Understanding energy and exergy efficiencies for improved energy management in power plants," Energy Policy, Elsevier, vol. 35(7), pages 3967-3978, July.
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