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Design and analysis of scroll expander using Ns-Ds diagram

Dash, A and Garg, P and Dutta, P (2018) Design and analysis of scroll expander using Ns-Ds diagram. In: 5th International Conference on Computational Methods for Thermal Problems, THERMACOMP 2018, 9 - 11 July 2018, Bengaluru, pp. 185-188.

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Official URL: https://docplayer.net/159029438-July-9-11-2018-iis...


Various studies on scroll expander available in literature have proven it to be an attractive choice for micro-scale (< 20 kWe) ORC application. These studies comprise of modifying the scroll compressor to be used in the expander mode followed by the development of semi-empirical models to determine the scroll performance. These models can provide the guidelines to design scroll expanders for a specific ORC application. This paper generates a number of scroll expander geometries and optimizes them for the best cycle efficiency for a 10 kWe R134a ORC cycle using the above mentioned models. Conventionally, the scroll expanders have been studied by plotting their performance indicators against the cycle operating parameters such as temperature, pressure and volume ratio. In this paper, we analyze these scroll expander geometries on the classical Ns-Ds diagram along with other expanders. It is observed that scroll expander occupies a domain of low Ns and high Ds, away from conventional turbine type expanders but closer to other positive displacement devices such as rotary and reciprocating type of expanders. This unique domain of scroll expanders Ns-Ds plot also signifies existence of other potential applications.

Item Type: Conference Paper
Publication: International Conference on Computational Methods for Thermal Problems
Publisher: Dalian University of Technology
Additional Information: The copyright for this article belongs to the Dalian University of Technology.
Keywords: Ns-Ds diagram; Organic rankine cycles; Scroll expander; Scroll geometry; Semi-empirical model; Volumetric expander
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 19 Aug 2022 04:51
Last Modified: 19 Aug 2022 04:51
URI: https://eprints.iisc.ac.in/id/eprint/75950

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