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Numerical Investigation of Compression and Expansion Process of Twin-Screw Machine Using R-134a

Author

Listed:
  • Chia-Cheng Tsao

    (Department of Mechanical Engineering, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan)

  • Wen-Kai Lin

    (Fu Sheng Industrial Co., Ltd., New Taipei City 241020, Taiwan)

  • Kai-Yuan Lai

    (Department of Mechanical Engineering, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan
    Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310401, Taiwan)

  • Savas Yavuzkurt

    (Department of Mechanical Engineering, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan)

  • Yao-Hsien Liu

    (Department of Mechanical Engineering, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan)

Abstract

Increasing the efficiency of twin-screw machines is beneficial for gas compression and expansion applications. We used a computation fluid dynamic approach to obtain the flow field and efficiency of a twin-screw machine that used R-134a as the working fluid. The leakage flow and sealing lines were obtained to study their geometrical effects during the compression and expansion process. The effects of the wrap angle (280°, 290°, and 300°) and pressure ratios on the compression efficiency were studied. During the compression process, the volumetric efficiency was more than 70% regardless of the wrap angle. We found that the volumetric efficiency slightly decreased when the wrap angle increased. However, the effect of the wrap angle on the isentropic efficiency was not substantial. An increase in the pressure ratio decreased the mass flow rate and increased the leakage flow. This screw machine can also be operated in an expansion process, and the simulated expansion ratio was 3:1. However, this expansion ratio contributed to an underexpanded condition, which led to a lower volumetric and isentropic efficiencies compared with the original built-in expansion ratio scenario.

Suggested Citation

  • Chia-Cheng Tsao & Wen-Kai Lin & Kai-Yuan Lai & Savas Yavuzkurt & Yao-Hsien Liu, 2023. "Numerical Investigation of Compression and Expansion Process of Twin-Screw Machine Using R-134a," Energies, MDPI, vol. 16(8), pages 1-14, April.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:8:p:3599-:d:1129456
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    References listed on IDEAS

    as
    1. Huagen Wu & Hao Huang & Beiyu Zhang & Baoshun Xiong & Kanlong Lin, 2019. "CFD Simulation and Experimental Study of Working Process of Screw Refrigeration Compressor with R134a," Energies, MDPI, vol. 12(11), pages 1-14, May.
    2. Zhang, Ye-Qiang & Wu, Yu-Ting & Xia, Guo-Dong & Ma, Chong-Fang & Ji, Wei-Ning & Liu, Shan-Wei & Yang, Kai & Yang, Fu-Bin, 2014. "Development and experimental study on organic Rankine cycle system with single-screw expander for waste heat recovery from exhaust of diesel engine," Energy, Elsevier, vol. 77(C), pages 499-508.
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