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Dynamic analysis and control strategy of solar-driven ORC-VCC system using zeotropic mixture

Author

Listed:
  • Wu, Jintao
  • Liang, Youcai
  • Dong, Meirong
  • Zhu, Yan
  • Zhou, Jieheng
  • Ling, Xunjie
  • Lu, Jidong

Abstract

The organic Rankine cycle and vapour compression refrigeration cycle (ORC-VCC) has garnered significant interest for their flexibility and ability to operate across a wide range of refrigeration temperatures. However, the performance of solar-driven ORC-VCC system is significantly influenced by direct normal irradiance (DNI). This study examines the dynamic response and develops a control strategy for this coupled system under variable DNI, aiming to ensure system safety and enhance efficiency. We propose a dynamic model of a solar-driven ORC-VCC system utilizing a zeotropic mixture. Adjustments to the DNI reveal how various mass fractions of the zeotropic mixture affect the system's dynamic response. Findings indicate that the temperature glide associated with the zeotropic mixture can enhance both the power output and cooling capacity of the system. Although the temperature glide increases power fluctuations, it also mitigates disturbances in cooling capacity. Therefore, a multi-device PID collaborative control, based on equipment response dynamics, is designed. This strategy not only stabilizes the superheat of the system throughout the day but also increases the capacities of power and cooling by up to 33.75 % and 42.86 %, respectively.

Suggested Citation

  • Wu, Jintao & Liang, Youcai & Dong, Meirong & Zhu, Yan & Zhou, Jieheng & Ling, Xunjie & Lu, Jidong, 2025. "Dynamic analysis and control strategy of solar-driven ORC-VCC system using zeotropic mixture," Energy, Elsevier, vol. 317(C).
    • Handle: RePEc:eee:energy:v:317:y:2025:i:c:s0360544225003482
    DOI: 10.1016/j.energy.2025.134706
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