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- Title:
Thermodynamic analysis on trilateral flash cycle (TFC) for low grade heat to power generation using different working fluids
- Document type:
- Konferenzbeitrag
- Author(s):
- Christina Antonopoulou; Konstantinos Atsonios; Panagiotis Grammelis; Dimitrios Manolakos; Anastasios Skiadopoulos; Pantelis Bakalis
- Abstract:
- Climate change and the global energy crisis strongly emphasize the need not only for low carbon energy production but also for the development of advanced technologies related to heat to power conversion applications. Recent technological advancements indicate that low-grade heat source (<100 oC), could potentially become a more sustainable power source. Trilateral Flash Cycle (TFC) is a thermodynamic cycle, the main difference of which compared to the widely used ORC is that the working fluid does not evaporate at the heating phase, but expands from a saturated liquid state. In particular, the working fluid is pressurized, heated at constant pressure, expanded as a two-phase mixture and eventually condensed at constant pressure. Beyond that, TFC employs the same components as an ORC application. This study aims to elaborate TFC thermodynamic analysis, highlight its efficiency and compare the overall cycle performance by using different working fluids. Working fluid selection is primarily focus on the comparison between promising fourth generation refrigerants such as HFO-1234yf and HFO-1234ze(E), with low GWP and zero ODP and more common ones such as HFCs. For each of the refrigerants, parametric investigations are performed, in order to determine the optimal operation aspects in terms of net power output, gross and net thermal efficiency, exergy and total recovery efficiency. The analysis is carried out with Aspen Plus while REFPROP calculation method was selected. The analysis highlighted the importance that the temperature difference across the heater and the expander isentropic efficiency have for the overall cycle performance. Thermodynamic results revealed that HFO-1234yf had the best power production and thermal efficiency performance, while HFC-245fa had a strong exergy potential for a heat source temperature of 90 oC.
- Editor:
- Technical University of Munich
- Book / Congress title:
- Proceedings of the 6th International Seminar on ORC Power Systems
- Organization:
- Technical University of Munich
- Date of congress:
- 11.10.2021-13.10.2021
- Publisher:
- Technical University of Munich
- Year:
- 2021
- E-ISBN:
- 978-3-00-070686-8
- Bookseries ISSN:
- 2709-7609
- Reviewed:
- ja
- Language:
- en
- Publication format:
- WWW
- Fulltext / DOI:
- doi:10.14459/2021mp1633139
- CC license:
- by-sa, http://creativecommons.org/licenses/by-sa/4.0
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