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

Kun-Hsien Lu (), Hsiao-Wei D. Chiang and Pei-Jen Wang
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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

Energies, 2022, vol. 15, issue 23, 1-18

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.

Keywords: transcritical CO 2; waste heat recovery; sensitivity analysis; isentropic efficiency; turbomachinery; recuperator (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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