Direct vs indirect evaporation in Organic Rankine Cycle (ORC) systems: A comparison of the dynamic behavior for waste heat recovery of engine exhaust

Manuel Jiménez-Arreola, Christoph Wieland and Alessandro Romagnoli

Applied Energy, 2019, vol. 242, issue C, 439-452

Abstract: Organic Rankine Cycle (ORC) is a prominent technology for the recovery of waste heat from internal combustion (IC) engines, in particular exhaust waste heat. An important challenge with IC engines, specially mobile, is the highly dynamic conditions and thus high variability of the waste heat thermal power which can lead to chemical decomposition of the ORC fluid or expander damage due to liquid droplets. The heat from the exhaust can be transferred to the ORC working fluid directly in one heat exchanger unit or indirectly through a heat transfer fluid. Compared to indirect evaporation, direct evaporation poses a higher risk to the integrity of the system due to a lower thermal damping capability. However, direct evaporation, is an attractive option in mobile applications due to its considerable lower footprint and potential of higher thermal efficiencies.

Keywords: Organic Rankine Cycle; Waste heat recovery; Dynamic characterization; Direct evaporation; Thermal power fluctuations (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (18)

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DOI: 10.1016/j.apenergy.2019.03.011

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