Mapping scroll expander performance for organic working fluids using dimensionless parameters in Ns-Ds diagram

Arun Kumar Narasimhan, Chatura Wickramaratne, Rajeev Kamal, D. Yogi Goswami and Punit Singh

Energy, 2019, vol. 182, issue C, 739-752

Abstract: This paper presents an analysis of single-stage scroll expander performance for pure fluids and their zeotropic mixtures in supercritical conditions using dimensionless parameters, namely specific speed (Ns) and specific diameter (Ds). Scroll geometries with different aspect ratios were modeled for a range of expander inlet temperatures. The expander efficiency was modeled accounting for losses due to leakage, friction, and over- and under-expansion. The expander efficiency was plotted as a function of two dimensionless parameters to analyze the applicability domain of scroll expanders. For a particular expander inlet temperature (Tin), zeotropic mixtures result in more compact scroll geometries than pure fluids, leading to reduced losses and better expander efficiency. Any increase in Tin results in larger scrolls leading to higher leakage and thereby lower efficiency. At suitable operating conditions, an optimized scroll expander design can achieve expansion efficiency as high as 75%. Sub-optimal scroll designs for a given application lead to lower expansion efficiency due to over- or under-expansion losses.

Keywords: Scroll expander; Dimensionless diagram; Performance mapping; Volume ratio; Expander efficiency (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (7)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:182:y:2019:i:c:p:739-752

DOI: 10.1016/j.energy.2019.06.054

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