A regenerative supercritical-subcritical dual-loop organic Rankine cycle system for energy recovery from the waste heat of internal combustion engines

Wang, E., Yu, Z. , Zhang, H. and Yang, F. (2017) A regenerative supercritical-subcritical dual-loop organic Rankine cycle system for energy recovery from the waste heat of internal combustion engines. Applied Energy, 190, pp. 574-590. (doi: 10.1016/j.apenergy.2016.12.122)

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Organic Rankine cycle (ORC) system is considered as a promising technology for energy recovery from the waste heat rejected by internal combustion (IC) engines. However, such waste heat is normally contained in both coolant and exhaust gases at quite different temperatures. A single ORC system is usually unable to efficiently recover energy from both of these waste heat sources. A dual loop ORC system which essentially has two cascaded ORCs to recover energy from the engine’s exhaust gases and coolant separately has been proposed to address this challenge. In this way, the overall efficiency of energy recovery can be substantially improved. This paper examines a regenerative dual loop ORC system using a pair of environmentally friendly refrigerants, R1233zd and R1234yf, as working fluids, to recover energy from the waste heat of a compressed natural gas (CNG) engine. Unlike most previous studies focusing on the ORC system only, the present research analyses the ORC system and CNG engine together as an integrated system. As such, the ORC system is analysed on the basis of real data of waste heat sources of the CNG engine under various operational conditions. A numerical model is employed to analyse the performances of the proposed dual loop cycle with four pairs of working fluids. The effects of a regenerative heat exchanger and several other key operating parameters are also analysed and discussed in detail. The performance of the integrated engine-ORC system is then analysed under actual engine operating conditions which were measured beforehand. The performance of the proposed system under off-design conditions has also been analysed. The obtained results show that the proposed dual loop ORC system could achieve better performance than other ORC systems for similar applications.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Yu, Professor Zhibin and Wang, Dr Enhua
Authors: Wang, E., Yu, Z., Zhang, H., and Yang, F.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Applied Energy
ISSN (Online):1872-9118
Published Online:09 January 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Applied Energy 190:574-590
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
642241Investigating zeotropic mixtures as working fluids for high efficiency Organic Rankine Cycle (ORC) power plantsZhibin YuRoyal Society (ROYSOC)RG130051ENG - ENGINEERING SYSTEMS POWER & ENERGY
684301Dynamic Organic Rankine Cycle for Recovering Industrial Waste HeatZhibin YuEngineering & Physical Sciences Research Council (EPSRC)EP/N005228/1ENG - ENGINEERING SYSTEMS POWER & ENERGY
721221Study on the integrated vehicle IC engine based ORC systemZhibin YuRoyal Society (ROYSOC)IE150866ENG - ENGINEERING SYSTEMS POWER & ENERGY