Experimental evaluation of the CO2-based mixture CO2/C6F6 in a recuperated transcritical cycle

Viktoria Carmen Illyés, Gioele Di Marcoberardino, Andreas Werner, Markus Haider and Giampaolo Manzolini

Energy, 2024, vol. 313, issue C

Abstract: Zeotropic CO2-based mixtures as working fluids in the power block have the potential to enhance concentrated solar power (CSP) plants and other high-temperature heat source applications. One promising working fluid is the CO2/C6F6 mixture, which enables condensation at 50 °C – a necessity when dry cooling with ambient air. Given the many theoretical studies on topics such as potential, optimized performance, or economic assessments, an experimental validation and a reality-check in a facility of significant size is required to vindicate further research. The experimental campaign was performed on pure CO2 and the CO2/C6F6 mixture in two compositions in a test facility (recuperated transcritical cycle). The long-term test (170h) revealed no operational issues, including no signs of thermal degradation. However, a composition shift - an effect previously regarded as an issue in closed cycles with zeotropic mixtures - affected the conditions at the vapor-liquid-equilibrium in the systems tank but also self-stabilizes the system to remain condensing, even at higher ambient air temperatures. The successful proof-of-concept at cycle temperatures of up to 500 °C – significantly higher than earlier studies on mixtures reported (<300 °C) – justifies further research in this area.

Keywords: Zeotropic working fluid; CO2-Based power cycle; Composition shift; Rankine cycle (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:313:y:2024:i:c:s0360544224034911

DOI: 10.1016/j.energy.2024.133713

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