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Article

Exergetic, Economic and Exergo-Environmental Analysis of Bottoming Power Cycles Operating with CO2-Based Binary Mixture

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Department of Mechanical Engineering, International Islamic University Islamabad (IIUI), Islamabad 44000, Pakistan
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Department of Mechanical and Industrial Engineering, Universita Degli Studi Di Brescia, via Branze 38, 25121 Brescia, Italy
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Facultad de Ingenieria, Universidad Autonoma de Yucatan, Av. Industrias No Contaminantes por Anillo Periferico Norte, Apdo., Postal 150 Merida, Mérida 97310, Yucatan, Mexico
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School of Mechanical, Aerospace and Automotive Engineering, Faculty of Engineering, Environmental and Computing, Coventry University, Coventry CV1 5FB, UK
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Mechanical Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Perak, Malaysia
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School of Mechanical, Biomedical and Design Engineering, College of Engineering and Applied Sciences, Aston University, Aston Triangle, Birmingham B4 7ET, UK
*
Author to whom correspondence should be addressed.
Energies 2020, 13(19), 5080; https://doi.org/10.3390/en13195080
Received: 27 August 2020 / Revised: 25 September 2020 / Accepted: 26 September 2020 / Published: 29 September 2020
(This article belongs to the Special Issue Low-Temperature Thermodynamic Power Cycles)
This study focused on investigating the bottoming power cycles operating with CO2-based binary mixture, taking into account exergetic, economic and exergo-environmental impact indices. The main intent is to assess the benefits of employing a CO2-based mixture working fluid in closed Brayton bottoming power cycles in comparison with pure CO2 working fluid. Firstly, selection criteria for the choice of suitable additive compound for CO2-based binary mixture is delineated and the composition of the binary mixture is decided based on required cycle minimum temperature. The decided CO2-C7H8 binary mixture with a 0.9 mole fraction of CO2 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 CO2-C7H8 mixture shows maximum power output and exergy efficiency at rather higher cycle pressure ratio compared to pure CO2 power cycles. PHC with CO2-C7H8 mixture shows 28.68% increment in exergy efficiency with the levelized cost of electricity (LCOE) 21.62% higher than pure CO2 PHC. Whereas, SRC with CO2-C7H8 mixture shows 25.17% increment in exergy efficiency with LCOE 57.14% higher than pure CO2 SRC. Besides showing lower economic value, cycles with a CO2-C7H8 mixture saves larger CO2 emissions and also shows greater exergo-environmental impact improvement and plant sustainability index. View Full-Text
Keywords: CO2-based binary mixture; bottoming power cycles; exergetic analysis; CO2 emissions savings; sustainability index; exergo-environmental impact indices CO2-based binary mixture; bottoming power cycles; exergetic analysis; CO2 emissions savings; sustainability index; exergo-environmental impact indices
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MDPI and ACS Style

Haroon, M.; Sheikh, N.A.; Ayub, A.; Tariq, R.; Sher, F.; Baheta, A.T.; Imran, M. Exergetic, Economic and Exergo-Environmental Analysis of Bottoming Power Cycles Operating with CO2-Based Binary Mixture. Energies 2020, 13, 5080. https://doi.org/10.3390/en13195080

AMA Style

Haroon M, Sheikh NA, Ayub A, Tariq R, Sher F, Baheta AT, Imran M. Exergetic, Economic and Exergo-Environmental Analysis of Bottoming Power Cycles Operating with CO2-Based Binary Mixture. Energies. 2020; 13(19):5080. https://doi.org/10.3390/en13195080

Chicago/Turabian Style

Haroon, Muhammad, Nadeem A. Sheikh, Abubakr Ayub, Rasikh Tariq, Farooq Sher, Aklilu T. Baheta, and Muhammad Imran. 2020. "Exergetic, Economic and Exergo-Environmental Analysis of Bottoming Power Cycles Operating with CO2-Based Binary Mixture" Energies 13, no. 19: 5080. https://doi.org/10.3390/en13195080

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