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Transcritical CO2 power cycle – Effects of regenerative heating using turbine bleed gas at intermediate pressure

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  • Mondal, Subha
  • De, Sudipta

Abstract

For energy utilization from low temperature waste heat, CO2 is a potential working fluid due to its lower critical temperature. In this work, assuming finite quantity of flue gas available at low temperature (200 °C), a thermodynamic model is developed for a transcritical CO2 power cycle utilizing turbine bleed gas for regenerative heating. Analysis show that the cycle performance improves with higher value of bleed ratio. However, for a specified bleed pressure and bleed gas temperature at the regenerator exit, maximum practical value of bleed ratio may be fixed by considering the exponential growth of the regenerator size (specified by NTU (number of transfer unit)). Most significant observation is the existence of optimum bleed pressures corresponding to maximum 1st law efficiency or minimum cycle irreversibility for specified values of remaining cycle parameters.

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  • Mondal, Subha & De, Sudipta, 2015. "Transcritical CO2 power cycle – Effects of regenerative heating using turbine bleed gas at intermediate pressure," Energy, Elsevier, vol. 87(C), pages 95-103.
    • Handle: RePEc:eee:energy:v:87:y:2015:i:c:p:95-103
    DOI: 10.1016/j.energy.2015.04.103
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    1. Mondal, Subha & De, Sudipta, 2017. "Power by waste heat recovery from low temperature industrial flue gas by Organic Flash Cycle (OFC) and transcritical-CO2 power cycle: A comparative study through combined thermodynamic and economic an," Energy, Elsevier, vol. 121(C), pages 832-840.
    2. Mondal, Subha & De, Sudipta, 2015. "CO2 based power cycle with multi-stage compression and intercooling for low temperature waste heat recovery," Energy, Elsevier, vol. 90(P1), pages 1132-1143.
    3. Li, Ligeng & Tian, Hua & Shi, Lingfeng & Zhang, Yonghao & Huang, Guangdai & Zhang, Hongfei & Wang, Xuan & Shu, Gequn, 2022. "Experimental investigation of a splitting CO2 transcritical power cycle in engine waste heat recovery," Energy, Elsevier, vol. 244(PB).
    4. Mondal, Subha & Alam, Shahbaz & De, Sudipta, 2018. "Performance assessment of a low grade waste heat driven organic flash cycle (OFC) with ejector," Energy, Elsevier, vol. 163(C), pages 849-862.
    5. Mondal, Subha & De, Sudipta, 2017. "Ejector based organic flash combined power and refrigeration cycle (EBOFCP&RC) – A scheme for low grade waste heat recovery," Energy, Elsevier, vol. 134(C), pages 638-648.
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    7. Ma, Ning & Bu, Zhengkun & Fu, Yanan & Hong, Wenpeng & Li, Haoran & Niu, Xiaojuan, 2023. "An operation strategy and off-design performance for supercritical brayton cycle using CO2-propane mixture in a direct-heated solar power tower plant," Energy, Elsevier, vol. 278(PA).
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    9. S. Mohammad S. Mahmoudi & Ata D. Akbari & Marc A. Rosen, 2016. "Thermoeconomic Analysis and Optimization of a New Combined Supercritical Carbon Dioxide Recompression Brayton/Kalina Cycle," Sustainability, MDPI, vol. 8(10), pages 1-19, October.

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