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

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Journal article
Published: 29 September 2020 in Energies
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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.

ACS Style

Muhammad Haroon; Nadeem Ahmed Sheikh; Abubakr Ayub; Rasikh Tariq; Farooq Sher; Aklilu Tesfamichael Baheta; Muhammad Imran. Exergetic, Economic and Exergo-Environmental Analysis of Bottoming Power Cycles Operating with CO2-Based Binary Mixture. Energies 2020, 13, 5080 .

AMA Style

Muhammad Haroon, Nadeem Ahmed Sheikh, Abubakr Ayub, Rasikh Tariq, Farooq Sher, Aklilu Tesfamichael Baheta, Muhammad Imran. Exergetic, Economic and Exergo-Environmental Analysis of Bottoming Power Cycles Operating with CO2-Based Binary Mixture. Energies. 2020; 13 (19):5080.

Chicago/Turabian Style

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 CO2-Based Binary Mixture." Energies 13, no. 19: 5080.

Special issue research article
Published: 28 January 2020 in International Journal of Energy Research
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This paper presents CO2‐toluene (CO2‐C7H8) binary mixture as working fluid to enhance the energetic and exergetic performance of CO2 bottoming power cycles in warm ambient conditions. A criterion for selection of CO2‐based binary mixture is defined, and 0.9 CO2/0.1 C7H8 composition is decided based on the required minimum cycle temperature compatible with ambient conditions. Bottoming simple regenerative cycle (BSRC) and bottoming preheating cycle (BPHC) configurations are selected, and their realistic operating conditions are determined based on sensitivity analysis. The performance of bottoming cycles using CO2‐C7H8 binary mixture is compared with the bottoming cycles using pure CO2 as working fluid at different ambient temperatures. It is observed that the cycles operating with pure CO2 can only perform better at lower ambient temperature conditions, whereas, at the increased ambient temperatures, bottoming cycles with CO2‐C7H8 binary mixture outperform and produce significant gains in exergetic and energetic performance compared with pure CO2 bottoming cycles. A maximum gain of exergetic efficiency for BSRC and BPHC observed is 26.83% and 18.71%, respectively, at an operating ambient temperature of 313 K, whereas an overall gain in energetic efficiencies for BSRC and BPHC observed is 28.92% and 10.12%, respectively. Taking into consideration thermodynamic performance, overall UA (product of overall heat transfer coefficient and heat transfer area for the heat exchanger) and specific investment cost, BPHC configuration is suggested as reasonable choice for higher ambient temperature conditions.

ACS Style

Muhammad Haroon; Abubakr Ayub; Nadeem A. Sheikh; Muhammad Imran. Exergetic performance and comparative assessment of bottoming power cycles operating with carbon dioxide–based binary mixture as working fluid. International Journal of Energy Research 2020, 44, 7957 -7973.

AMA Style

Muhammad Haroon, Abubakr Ayub, Nadeem A. Sheikh, Muhammad Imran. Exergetic performance and comparative assessment of bottoming power cycles operating with carbon dioxide–based binary mixture as working fluid. International Journal of Energy Research. 2020; 44 (10):7957-7973.

Chicago/Turabian Style

Muhammad Haroon; Abubakr Ayub; Nadeem A. Sheikh; Muhammad Imran. 2020. "Exergetic performance and comparative assessment of bottoming power cycles operating with carbon dioxide–based binary mixture as working fluid." International Journal of Energy Research 44, no. 10: 7957-7973.