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Prospects of Mixtures as Working Fluids in Real-Gas Brayton Cycles

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  • Costante Mario Invernizzi

    (Department of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy)

Abstract

This paper discusses the thermodynamic characteristics of the closed Brayton cycles in which the compression is placed near the critical point of the working fluid. Under these conditions, the specific volumes of the fluid during the compression are a fraction of the corresponding values under ideal gas conditions, and the cycle performances improve significantly, mainly at moderate top temperatures. As the heat is discharged at about the critical temperature, the choice of the correct working fluid is strictly correlated with the environmental temperature or with the temperature of potential heat users. To resort to mixtures greatly extend the choice of the right working fluid, allowing a continuous variation of the critical temperature. These cycles have a high power density, and the use of ordinary turbomachinery is accompanied by high capacities (tens of megawatts). In the low power range, microturbines or reciprocating engines are required. One important constraint on the choice of the right working fluid is its thermochemical stability that restricts the operative temperatures. Among the organic compounds, the maximum safe temperatures are limited to about 400 °C and, forecasting high temperature applications, it could be interesting to explore the potentiality of the inorganic compounds as secondary fluids in binary mixtures.

Suggested Citation

  • Costante Mario Invernizzi, 2017. "Prospects of Mixtures as Working Fluids in Real-Gas Brayton Cycles," Energies, MDPI, vol. 10(10), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:10:p:1649-:d:115673
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    References listed on IDEAS

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    1. Invernizzi, Costante M. & Iora, Paolo, 2016. "The exploitation of the physical exergy of liquid natural gas by closed power thermodynamic cycles. An overview," Energy, Elsevier, vol. 105(C), pages 2-15.
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    Cited by:

    1. Costante M. Invernizzi & Abubakr Ayub & Gioele Di Marcoberardino & Paolo Iora, 2019. "Pure and Hydrocarbon Binary Mixtures as Possible Alternatives Working Fluids to the Usual Organic Rankine Cycles Biomass Conversion Systems," Energies, MDPI, vol. 12(21), pages 1-17, October.
    2. Crespi, F. & Rodríguez de Arriba, P. & Sánchez, D. & Ayub, A. & Di Marcoberardino, G. & Invernizzi, C.M. & Martínez, G.S. & Iora, P. & Di Bona, D. & Binotti, M. & Manzolini, G., 2022. "Thermal efficiency gains enabled by using CO2 mixtures in supercritical power cycles," Energy, Elsevier, vol. 238(PC).
    3. Rodríguez-deArriba, Pablo & Crespi, Francesco & Sánchez, David & Muñoz, Antonio & Sánchez, Tomás, 2022. "The potential of transcritical cycles based on CO2 mixtures: An exergy-based analysis," Renewable Energy, Elsevier, vol. 199(C), pages 1606-1628.
    4. Chenqi Tang & Lingen Chen & Huijun Feng & Wenhua Wang & Yanlin Ge, 2020. "Power Optimization of a Modified Closed Binary Brayton Cycle with Two Isothermal Heating Processes and Coupled to Variable-Temperature Reservoirs," Energies, MDPI, vol. 13(12), pages 1-21, June.
    5. 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.
    6. Di Marcoberardino, G. & Morosini, E. & Manzolini, G., 2022. "Preliminary investigation of the influence of equations of state on the performance of CO2 + C6F6 as innovative working fluid in transcritical cycles," Energy, Elsevier, vol. 238(PB).
    7. Costante Mario Invernizzi & Gioele Di Marcoberardino, 2023. "An Overview of Real Gas Brayton Power Cycles: Working Fluids Selection and Thermodynamic Implications," Energies, MDPI, vol. 16(10), pages 1-20, May.
    8. Xu, Chi & Kong, Fanli & Yu, Dali & Yu, Jie & Khan, Muhammad Salman, 2021. "Influence of non-ideal gas characteristics on working fluid properties and thermal cycle of space nuclear power generation system," Energy, Elsevier, vol. 222(C).
    9. Abubakr Ayub & Costante M. Invernizzi & Gioele Di Marcoberardino & Paolo Iora & Giampaolo Manzolini, 2020. "Carbon Dioxide Mixtures as Working Fluid for High-Temperature Heat Recovery: A Thermodynamic Comparison with Transcritical Organic Rankine Cycles," Energies, MDPI, vol. 13(15), pages 1-18, August.
    10. Vedran Mrzljak & Igor Poljak & Maro Jelić & Jasna Prpić-Oršić, 2023. "Thermodynamic Analysis and Improvement Potential of Helium Closed Cycle Gas Turbine Power Plant at Four Loads," Energies, MDPI, vol. 16(15), pages 1-26, July.

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