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Sensitivity Analysis of Transcritical CO 2 Cycle Performance Regarding Isentropic Efficiencies of Turbomachinery for Low Temperature Heat Sources

Author

Listed:
  • Kun-Hsien Lu

    (Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu City 30013, Taiwan)

  • Hsiao-Wei D. Chiang

    (Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu City 30013, Taiwan)

  • Pei-Jen Wang

    (Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu City 30013, Taiwan)

Abstract

The transcritical CO 2 (T-CO 2 ) power cycle using low temperature waste heat is a promising technique for energy saving and environmental protection. However, according to the literature, there is no commercialized unit in service yet. This study provides developers a reference to shorten the design phase of the T-CO 2 cycle commercialization process. A sensitivity analysis of the system performance, i.e., thermal efficiency and net power output, regarding the isentropic efficiencies of pump ( η p ) and expander ( η e ) and the heat source temperature ( T h , i n ) has been carried out using MATLAB and NIST REFPROP database. Simple and recuperative configurations are investigated based on their own optimal working pressures. The results show that the enhancement of η e has a greater influence on improving the system performance, but the improvement will diminish as η p , η e , and T h , i n increase. Although better system performance can be achieved with higher η p , η e , and T h , i n , the cost of the system equipment will also increase due to the higher optimal working pressure. In addition, increasing η p and η e will negatively affect the effectiveness of the recuperator. Therefore, the turbomachinery efficiencies and the heat source temperature should be considered simultaneously for the most cost-effective system design.

Suggested Citation

  • Kun-Hsien Lu & Hsiao-Wei D. Chiang & Pei-Jen Wang, 2022. "Sensitivity Analysis of Transcritical CO 2 Cycle Performance Regarding Isentropic Efficiencies of Turbomachinery for Low Temperature Heat Sources," Energies, MDPI, vol. 15(23), pages 1-18, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:23:p:8868-:d:982656
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    References listed on IDEAS

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