Improving the semi-empirical modelling of a single-screw expander for small organic Rankine cycles

Antonio Giuffrida

Applied Energy, 2017, vol. 193, issue C, 356-368

Abstract: The common semi-empirical modelling adopted for positive-displacement rotary expanders is revised in this paper. Paying particular attention to the leakage flow rates, the mechanical losses at the shaft and the ambient heat losses by the proposal of a more physically sound modelling, this paper aims at improving the performance simulation of a single-screw expander for which there exists a wide experimental campaign in literature. In detail, the mechanical losses are modelled with an approach consistent with the Stribeck’s theory, whereas the contributions of both natural convection and radiation are taken into account for a proper modelling of the ambient heat losses.

Keywords: Single-screw expander; Semi-empirical modelling; R245fa; Performance simulation; Expander efficiency; Organic Rankine cycle (search for similar items in EconPapers)
Date: 2017
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Citations: View citations in EconPapers (26)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:193:y:2017:i:c:p:356-368

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DOI: 10.1016/j.apenergy.2017.02.015

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