Experimental study of a 1 kw organic Rankine cycle with a zeotropic mixture of R245fa/R134a

Gholamreza Bamorovat Abadi, Eunkoo Yun and Kyung Chun Kim

Energy, 2015, vol. 93, issue P2, 2363-2373

Abstract: The performance of a new zeotropic mixture of R245fa 60%/R134a 40% (molar concentration) in small scale ORC (organic Rankine cycle) was proposed and evaluated experimentally. For a range of heat source temperatures, the power output and thermal efficiency of the ORC system with this mixture was analyzed. The experimental data is presented for a 1 kW scroll expander and a heat source temperature between 80 and 120 °C. The results showed that the proposed zeotropic mixture increases the power output compared to an identical ORC with pure R245fa despite working at a lower pressure ratio. With increasing heat source temperature, the pure R245fa ORC becomes increasingly vigorous. Therefore, the best application of this mixture would be in heat sources with temperatures between 80 °C and 100 °C, where the pure R245fa ORC cannot have a high expander inlet pressure; hence, it works at lower pressure ratios.

Keywords: Organic Rankine cycle; Zeotropic mixtures; R245fa; R134a; Composition shift (search for similar items in EconPapers)
Date: 2015
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Citations: View citations in EconPapers (22)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:93:y:2015:i:p2:p:2363-2373

DOI: 10.1016/j.energy.2015.10.092

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