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Dynamic Simulation of Partial Load Operation of an Organic Rankine Cycle with Two Parallel Expanders

Author

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  • Michael Chukwuemeka Ekwonu

    (School of Mechanical Engineering, Eco-Friendly Smart Ship Parts Technology Innovation Center, Pusan National University, Busan 46241, Republic of Korea)

  • Mirae Kim

    (School of Mechanical Engineering, Eco-Friendly Smart Ship Parts Technology Innovation Center, Pusan National University, Busan 46241, Republic of Korea
    These authors contributed equally to this work.)

  • Binqi Chen

    (School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu 611730, China
    These authors contributed equally to this work.)

  • Muhammad Tauseef Nasir

    (School of Mechanical Engineering, Eco-Friendly Smart Ship Parts Technology Innovation Center, Pusan National University, Busan 46241, Republic of Korea)

  • Kyung Chun Kim

    (School of Mechanical Engineering, Eco-Friendly Smart Ship Parts Technology Innovation Center, Pusan National University, Busan 46241, Republic of Korea)

Abstract

The parallel expander ORC system is one of the solutions for providing an additional power output by improving the partial-load performance of an ORC. The parallel expander system corresponds to partial-load conditions by switching between various combinations of the expanders. During this process, the dynamic behavior occurs, which have not been characterized well in the open literature according to the best of the authors’ knowledge. In this study, we developed a dynamic modeling of an ORC system using dual expanders (DE-ORC) to study the dynamic responses during its mode changes. System components were simulated using an open-source library of ThermoCycle written in Modelica language. For each component, empirical parameters were implemented based on the experimental results. Furthermore, during the mode change that involved going from dual expander mode to singular expander mode, and to prevent the formation of the droplet in the expanders, a control strategy was proposed and simulated. The strategy involved lowering of the mass flow rate and then shifting the mode. Several timings between flow rate lowering and shifting the mode were analyzed, and the optimum shifting time was found to be in between 40 to 50 s.

Suggested Citation

  • Michael Chukwuemeka Ekwonu & Mirae Kim & Binqi Chen & Muhammad Tauseef Nasir & Kyung Chun Kim, 2023. "Dynamic Simulation of Partial Load Operation of an Organic Rankine Cycle with Two Parallel Expanders," Energies, MDPI, vol. 16(1), pages 1-18, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:1:p:519-:d:1023135
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    References listed on IDEAS

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