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

Muhammad Haroon, Nadeem Ahmed Sheikh, Abubakr Ayub, Rasikh Tariq, Farooq Sher, Aklilu Tesfamichael Baheta and Muhammad Imran
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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

Energies, 2020, vol. 13, issue 19, 1-19

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.

Keywords: CO 2 -based binary mixture; bottoming power cycles; exergetic analysis; CO 2 emissions savings; sustainability index; exergo-environmental impact indices (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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