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

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

Energy, 2016, vol. 113, issue C, 204-214

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.

Keywords: Organic Rankine cycle; Multiple parallel expanders; Part-load; Off-design; Waste heat variation; Internal combustion engine (ICE); Waste heat recovery (WHR); Scroll expander; R245fa (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:113:y:2016:i:c:p:204-214

DOI: 10.1016/j.energy.2016.07.045

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