Thermodynamic analysis of a dual-loop organic Rankine cycle (ORC) for waste heat recovery of a petrol engine

Wang, E., Yu, Z. , Collings, P., Zhang, H., Yang, F. and Bei, C. (2016) Thermodynamic analysis of a dual-loop organic Rankine cycle (ORC) for waste heat recovery of a petrol engine. In: Heat Powered Cycles Conference 2016, Nottingham, UK, 27-29 Jun 2016, ISBN 9780956332950

122738.pdf - Accepted Version



Huge amounts of low-grade heat energy are discharged to the environment by vehicular engines. Considering the large number of vehicles in the world, such waste energy has a great impact on our environment globally. The Organic Rankine Cycle (ORC), which uses an organic fluid with a low boiling point as the working medium, is considered to be the most promising technology to recover energy from low-grade waste heat. In this study, a dual-loop ORC is presented to simultaneously recover energy from both the exhaust gases and the coolant of a petrol engine. A high-temperature (HT) ORC loop is used to recover heat from the exhaust gases, while a low-temperature (LT) ORC loop is used to recover heat from the coolant and the condensation heat of the HT loop. Figure 1 shows the schematic of the dual-loop ORC. Differing from previous research, two more environmentally friendly working fluids are used, and the corresponding optimisation is conducted. First, the system structure and operating principle are described. Then, a mathematical model of the designed dual-loop ORC is established. Next, the performance of the dual-loop cycle is analysed over the entire engine operating region. Furthermore, the states of each point along the cycle and the heat load of each component are compared with the results of previous research. The results show that the dual-loop ORC can effectively recover the waste heat from the petrol engine, and that the effective thermal efficiency can be improved by about 20 ~ 24%, 14~20%, and 30% in the high-speed, medium-speed, and low-speed operation regions, respectively. The designed dual-loop ORC can achieve a higher system efficiency than previous ORCs of this structure. Therefore, it is a good choice for waste heat recovery from vehicle engines.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Wang, Dr Enhua and Collings, Mr Peter and Yu, Professor Zhibin
Authors: Wang, E., Yu, Z., Collings, P., Zhang, H., Yang, F., and Bei, C.
Subjects:T Technology > TJ Mechanical engineering and machinery
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Research Group:System, Power and Energy
Copyright Holders:Copyright © 2016 Heat Powered Cycles
First Published:First published in Heat Powered Cycles Conference 2016
Publisher Policy:Reproduced with the permission of the Editor
Related URLs:

University Staff: Request a correction | Enlighten Editors: Update this record

Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
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