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Multi-objective optimization of the dual-pressure organic Rankine cycle system based on the orthogonal design method under different external conditions

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Listed:
  • Xia, Xiaoxia
  • Yang, Chengwu
  • Wang, Zhiqi
  • Sun, Tong
  • Zhang, Hualong
  • Wu, Jinhao

Abstract

The dual-pressure organic Rankine cycle (DPORC) system can obtain a better temperature match between the heat source and working fluid due to the existence of two evaporation processes, which can significantly improve the utilization rate of the heat source and reduce the irreversible loss. Firstly, single-objective optimization of the DPORC system is conducted based on the orthogonal design method with thermal efficiency, exergy efficiency, electricity production cost (EPC) and annual emission reduction (AER) as the performance indicators, respectively. Then, multi-objective optimization of all performance indicators is carried out based on the comprehensive scoring method. Finally, the contribution rates of the operation parameters and the optimal working conditions under different external conditions are investigated. The results show that condensation temperature, high-pressure evaporation temperature and turbine isentropic efficiency are the most critical parameters for system comprehensive performance. When heat source temperature is 170 °C, thermal efficiency, exergy efficiency, EPC and AER under the optimal working conditions are 11.91%, 48.46%, 2.71 × 10−2$/kWh and 11.17 × 105kg, respectively. With the increase of heat source temperature, condensation temperature and turbine isentropic efficiency always have an important influence on system comprehensive performance. The contribution rates of high-pressure evaporation temperature and low-pressure evaporation temperature increase and decrease, respectively. Better comprehensive performance can be obtained by using HC working fluid.

Suggested Citation

  • Xia, Xiaoxia & Yang, Chengwu & Wang, Zhiqi & Sun, Tong & Zhang, Hualong & Wu, Jinhao, 2024. "Multi-objective optimization of the dual-pressure organic Rankine cycle system based on the orthogonal design method under different external conditions," Energy, Elsevier, vol. 296(C).
  • Handle: RePEc:eee:energy:v:296:y:2024:i:c:s0360544224008818
    DOI: 10.1016/j.energy.2024.131109
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    References listed on IDEAS

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