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A study of clearance height on the performance of single-screw expanders in small-scale organic Rankine cycles

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  • Shen, Lili
  • Wang, Wei
  • Wu, Yuting
  • Lei, Biao
  • Zhi, Ruiping
  • Lu, Yuanwei
  • Wang, Jingfu
  • Ma, Chongfang

Abstract

A single-screw expander (SSE) is a type of volumetric expander that can be applied to low-grade heat and waste heat recovery utilizing the organic Rankine cycle system. In this paper, a new thermodynamic modeling of SSEs considering the friction power consumption is carried out to examine the performance. The mathematical model was verified by experimental results, and the calculation results have a good agreement with the experimental results. The clearance height has great influence on the expander performance. The influence of clearance height on the leakage flow rate, friction power consumption, volumetric and isentropic efficiency were investigated. Results show that path L8, L7 and L2+4 are the three main leakage paths, and path L8, L7 and L9 are the three main friction power consumption. Compared with the meshing clearance height, the fitting clearance has a more significant effect on the performance of SSEs. Setting a higher fitting clearance and meshing clearance is an effective measure to reduce friction power consumption and prevent gaterotor wear, respectively. It would be favorable if the fitting and meshing clearance height is no less than 0.04 mm and 0.02 mm, respectively.

Suggested Citation

  • Shen, Lili & Wang, Wei & Wu, Yuting & Lei, Biao & Zhi, Ruiping & Lu, Yuanwei & Wang, Jingfu & Ma, Chongfang, 2018. "A study of clearance height on the performance of single-screw expanders in small-scale organic Rankine cycles," Energy, Elsevier, vol. 153(C), pages 45-55.
    • Handle: RePEc:eee:energy:v:153:y:2018:i:c:p:45-55
    DOI: 10.1016/j.energy.2018.02.004
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    3. Fabio Fatigati & Marco Di Bartolomeo & Davide Di Battista & Roberto Cipollone, 2020. "Experimental Validation of a New Modeling for the Design Optimization of a Sliding Vane Rotary Expander Operating in an ORC-Based Power Unit," Energies, MDPI, vol. 13(16), pages 1-23, August.
    4. Wang, Wei & Shen, Li-li & Chen, Ru-meng & Wu, Yu-ting & Ma, Chong-fang, 2020. "Numerical study of heat transfer influence on the performance of a single screw expander for Organic Rankine Cycle," Energy, Elsevier, vol. 193(C).
    5. Wang, Wei & Huo, Jia-hui & Tao, Yue-ting & Lei, Biao & Wu, Yu-ting & Ma, Chong-fang, 2023. "Semi-empirical modelling and analysis of single screw expanders considering inlet and exhaust pressure losses," Energy, Elsevier, vol. 266(C).
    6. Xinxin Zhang & Yin Zhang & Min Cao & Jingfu Wang & Yuting Wu & Chongfang Ma, 2019. "Working Fluid Selection for Organic Rankine Cycle Using Single-Screw Expander," Energies, MDPI, vol. 12(16), pages 1-23, August.
    7. Li, Yanan & Zhi, Ruiping & Wu, Yuting & Wang, Jingfu & Lei, Biao & Shen, Lili, 2022. "Influence of clearance height on performance of water-lubricated single-screw air compressor," Energy, Elsevier, vol. 251(C).
    8. Wang, Wei & Qiao, Han & Lei, Biao & Wu, Yu-ting & Ma, Chong-fang, 2021. "Experimental study on the influence of inlet and exhaust pressure loss on the performance of single screw expanders," Energy, Elsevier, vol. 232(C).
    9. Murthy, Anarghya Ananda & Norris, Stuart & Subiantoro, Alison, 2022. "Experimental investigation of internal leakages and effects of lubricating oil on the performance of a four-intersecting-vane rotary expander," Energy, Elsevier, vol. 238(PB).
    10. Guo, Zhiyu & Zhang, Cancan & Wu, Yuting & Lei, Biao & Yan, Dong & Zhi, Ruiping & Shen, Lili, 2020. "Numerical optimization of intake and exhaust structure and experimental verification on single-screw expander for small-scale ORC applications," Energy, Elsevier, vol. 199(C).

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