Sathish, Sharath and Kumar, Pramod and Namburi, Adi Narayana and Gopi, Pramod Chandra and Carlson, Matthew D and Ho, Clifford K (2017) Optimization of Operating Parameters of a Recompression sCO2 Cycle for Maximum Efficiency. In: ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017, 26 - 30 June 2017, Charlotte.
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Abstract
Supercritical CO2 power systems offer significant power density advantages along with high efficiencies, compared to traditional Rankine or Brayton cycles. Of the several viable configurations, the recompression cycle has higher efficiency compared to the simple recuperated cycle for source temperatures above 500°C. It also provides a good trade-off between efficiency and plant complexity. This paper explores the dependence of critical operational parameters on source and sink-temperature, which is then used as a means to generate guidelines for developing recompression sCO2 power plants. The maximum source temperature in the analysis is restricted to 565°C to take advantage of the existing materials and technologies associated with industrial steam turbines. However, the methodology described herein is applicable for any other source temperature range. An important source of thermal efficiency degradation in power plants is attributable to heat exchangers. Analysis presented in this work directly relates the optimum operational parameters of the recompression cycle to the operation of the low temperature recuperator. Thermodynamic analysis confirms that a recompression fraction of 0.25 and pressure ratio of 2.5 is as an optimum design point for the recompression cycle. The penalty in efficiency and power while operating the plant in offdesign conditions for a fixed recompression fraction and pressure ratio is highlighted.
| Item Type: | Conference Paper |
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| Publisher: | American Society of Mechanical Engineers (ASME) |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Brayton cycle; Carbon dioxide; Economic and social effects; Steam turbines; Thermoanalysis; Turbomachinery; Wind power; Materials and technologies; Maximum Efficiency; Off design condition; Operating parameters; Operational parameters; Recompression cycles; Source temperature; Thermo dynamic analysis; Temperature |
| Department/Centre: | Division of Mechanical Sciences > Mechanical Engineering |
| Date Deposited: | 14 Jun 2022 05:32 |
| Last Modified: | 14 Jun 2022 05:32 |
| URI: | https://eprints.iisc.ac.in/id/eprint/73434 |
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