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Numerical optimization of intake and exhaust structure and experimental verification on single-screw expander for small-scale ORC applications

Author

Listed:
  • Guo, Zhiyu
  • Zhang, Cancan
  • Wu, Yuting
  • Lei, Biao
  • Yan, Dong
  • Zhi, Ruiping
  • Shen, Lili

Abstract

This paper focused on the intake and exhaust structure optimization of a single-screw expander (SSE) by using numerical method. The effects of internal volume ratio, the shape and clearance height of the intake port and exhaust area were numerically analyzed (R123 and HFO-1336mzz(Z) were selected as working fluids) to reduce the energy losses (more than 30%) caused by pressure loss and leakage in intake process and exhaust pressure loss. The suggestions of reducing the internal volume ratio and clearance height at intake port and removing the closed helix line were given based on the simulation results. Then, the optimized SSE was developed and experimentally tested in ORC system with R123 as working fluid. Results showed that the filling factor of the prototype was reduced from 125% to nearly 100% and the highest shaft efficiency was increased from 56% to 67.7% at 3000 rpm. The enhanced performance of the new prototype proves the correctness of the numerical optimization and this is expected to provide guidance for the design of SSE.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:199:y:2020:i:c:s0360544220305855
    DOI: 10.1016/j.energy.2020.117478
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    Cited by:

    1. 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).
    2. Ping, Xu & Yang, Fubin & Zhang, Hongguang & Wang, Yan & Lei, Biao & Wu, Yuting, 2022. "Performance limits of the single screw expander in organic Rankine cycle with ensemble learning and hyperdimensional evolutionary many-objective optimization algorithm intervention," Energy, Elsevier, vol. 245(C).
    3. Zhang, Hong-Hu & Zhang, Yi-Fan & Feng, Yong-Qiang & Chang, Jen-Chieh & Chang, Chao-Wei & Xi, Huan & Gong, Liang & Hung, Tzu-Chen & Li, Ming-Jia, 2023. "The parametric analysis on the system behaviors with scroll expanders employed in the ORC system: An experimental comparison," Energy, Elsevier, vol. 268(C).
    4. Casari, Nicola & Fadiga, Ettore & Pinelli, Michele & Randi, Saverio & Suman, Alessio & Ziviani, Davide, 2020. "Investigation of flow characteristics in a single screw expander: A numerical approach," Energy, Elsevier, vol. 213(C).

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