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

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

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.

Suggested Citation

  • Narasimhan, Arun Kumar & Wickramaratne, Chatura & Kamal, Rajeev & Goswami, D. Yogi & Singh, Punit, 2019. "Mapping scroll expander performance for organic working fluids using dimensionless parameters in Ns-Ds diagram," Energy, Elsevier, vol. 182(C), pages 739-752.
    • Handle: RePEc:eee:energy:v:182:y:2019:i:c:p:739-752
    DOI: 10.1016/j.energy.2019.06.054
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    Citations

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    Cited by:

    1. Ying Zhang & Li Zhao & Shuai Deng & Ming Li & Yali Liu & Qiongfen Yu & Mengxing Li, 2022. "Novel Off-Design Operation Maps Showing Functionality Limitations of Organic Rankine Cycle Validated by Experiments," Energies, MDPI, vol. 15(21), pages 1-19, November.
    2. Emhardt, Simon & Tian, Guohong & Song, Panpan & Chew, John & Wei, Mingshan, 2022. "CFD analysis of the influence of variable wall thickness on the aerodynamic performance of small scale ORC scroll expanders," Energy, Elsevier, vol. 244(PA).
    3. Feng, Yong-qiang & Xu, Jing-wei & He, Zhi-xia & Hung, Tzu-Chen & Shao, Meng & Zhang, Fei-yang, 2022. "Numerical simulation and optimal design of scroll expander applied in a small-scale organic rankine cycle," Energy, Elsevier, vol. 260(C).
    4. Braccio, Simone & Di Nardo, Antonio & Calchetti, Giorgio & Phan, Hai Trieu & Le Pierrès, Nolwenn & Tauveron, Nicolas, 2023. "Performance evaluation of a micro partial admission impulse axial turbine in a combined ammonia-water cooling and electricity absorption cycle," Energy, Elsevier, vol. 278(PB).
    5. Galloni, E., 2022. "Analysis on the waste heat recovery in a light duty vehicle," Energy, Elsevier, vol. 238(PA).
    6. Oh, Jinwoo & Jeong, Hoyoung & Kim, Joonbyum & Lee, Hoseong, 2020. "Numerical and experimental investigation on thermal-hydraulic characteristics of a scroll expander for organic Rankine cycle," Applied Energy, Elsevier, vol. 278(C).
    7. Xander van Heule & Michel De Paepe & Steven Lecompte, 2022. "Two-Phase Volumetric Expanders: A Review of the State-of-the-Art," Energies, MDPI, vol. 15(14), pages 1-14, July.

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