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Parallel-expander Organic Rankine cycle using dual expanders with different capacities

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  • Yun, Eunkoo
  • Kim, Dokyun
  • Lee, Minseog
  • Baek, Seungdong
  • Yoon, Sang Youl
  • Kim, Kyung Chun

Abstract

This study reports on a parallel-expander Organic Rankine cycle (PE-ORC) using dual expanders with different capacities. This system is applicable to waste heat sources that have large variation, such as distributed power plants with varying electricity demand. The test bench for the experimental investigation consists of a PE-ORC loop with two different scroll expanders, an electrical water heating system, and an air-cooled chiller. The tested performance characteristics for each operating mode are presented. The experimental results show three clearly separated operation regions with high efficiency, two possible switching points of the operating mode, and good heat recovery capability over a wider range of heat input compared to a PE-ORC system with two identical expanders. A control strategy for the system is proposed to maintain superheated state at the inlet of expander and to obtain high performance after changing the operating mode.

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  • Yun, Eunkoo & Kim, Dokyun & Lee, Minseog & Baek, Seungdong & Yoon, Sang Youl & Kim, Kyung Chun, 2016. "Parallel-expander Organic Rankine cycle using dual expanders with different capacities," Energy, Elsevier, vol. 113(C), pages 204-214.
    • Handle: RePEc:eee:energy:v:113:y:2016:i:c:p:204-214
    DOI: 10.1016/j.energy.2016.07.045
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    Cited by:

    1. 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.
    2. Zhang, Xuanang & Wang, Xuan & Cai, Jinwen & Wang, Rui & Bian, Xingyan & He, Zhaoxian & Tian, Hua & Shu, Gequn, 2023. "Operation strategy of a multi-mode Organic Rankine cycle system for waste heat recovery from engine cooling water," Energy, Elsevier, vol. 263(PE).

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