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Exergetic, Economic and Exergo-Environmental Analysis of Bottoming Power Cycles Operating with CO 2 -Based Binary Mixture

Author

Listed:
  • Muhammad Haroon

    (Department of Mechanical Engineering, International Islamic University Islamabad (IIUI), Islamabad 44000, Pakistan)

  • Nadeem Ahmed Sheikh

    (Department of Mechanical Engineering, International Islamic University Islamabad (IIUI), Islamabad 44000, Pakistan)

  • Abubakr Ayub

    (Department of Mechanical and Industrial Engineering, Universita Degli Studi Di Brescia, via Branze 38, 25121 Brescia, Italy)

  • Rasikh Tariq

    (Facultad de Ingenieria, Universidad Autonoma de Yucatan, Av. Industrias No Contaminantes por Anillo Periferico Norte, Apdo., Postal 150 Merida, Mérida 97310, Yucatan, Mexico)

  • Farooq Sher

    (School of Mechanical, Aerospace and Automotive Engineering, Faculty of Engineering, Environmental and Computing, Coventry University, Coventry CV1 5FB, UK)

  • Aklilu Tesfamichael Baheta

    (Mechanical Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Perak, Malaysia)

  • Muhammad Imran

    (School of Mechanical, Biomedical and Design Engineering, College of Engineering and Applied Sciences, Aston University, Aston Triangle, Birmingham B4 7ET, UK)

Abstract

This study focused on investigating the bottoming power cycles operating with CO 2 -based binary mixture, taking into account exergetic, economic and exergo-environmental impact indices. The main intent is to assess the benefits of employing a CO 2 -based mixture working fluid in closed Brayton bottoming power cycles in comparison with pure CO 2 working fluid. Firstly, selection criteria for the choice of suitable additive compound for CO 2 -based binary mixture is delineated and the composition of the binary mixture is decided based on required cycle minimum temperature. The decided CO 2 -C 7 H 8 binary mixture with a 0.9 mole fraction of CO 2 is analyzed in two cycle configurations: Simple regenerative cycle (SRC) and Partial heating cycle (PHC). Comparative analysis among two configurations with selected working fluid are carried out. Thermodynamic analyses at varying cycle pressure ratio shows that cycle with CO 2 -C 7 H 8 mixture shows maximum power output and exergy efficiency at rather higher cycle pressure ratio compared to pure CO 2 power cycles. PHC with CO 2 -C 7 H 8 mixture shows 28.68% increment in exergy efficiency with the levelized cost of electricity (LCOE) 21.62% higher than pure CO 2 PHC. Whereas, SRC with CO 2 -C 7 H 8 mixture shows 25.17% increment in exergy efficiency with LCOE 57.14% higher than pure CO 2 SRC. Besides showing lower economic value, cycles with a CO 2 -C 7 H 8 mixture saves larger CO 2 emissions and also shows greater exergo-environmental impact improvement and plant sustainability index.

Suggested Citation

  • Muhammad Haroon & Nadeem Ahmed Sheikh & Abubakr Ayub & Rasikh Tariq & Farooq Sher & Aklilu Tesfamichael Baheta & Muhammad Imran, 2020. "Exergetic, Economic and Exergo-Environmental Analysis of Bottoming Power Cycles Operating with CO 2 -Based Binary Mixture," Energies, MDPI, vol. 13(19), pages 1-19, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:19:p:5080-:d:421327
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    References listed on IDEAS

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