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Working fluid selection for a small-scale organic Rankine cycle recovering engine waste heat

Lookup NU author(s): Dr Yiji Lu, Professor Tony Roskilly, Dr Long Jiang



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


This paper reports the design and evaluation of a 1 kWe Organic Rankine cycle using different working fluids for engine coolant and exhaust recovery from a 6.5 kW small ICE. Six working fluids have been selected to evaluate and compare the performance of the ORC system. The net power output, thermal efficiency, rotational speed of the scroll expander and condenser load of the ORC system have been studied. Results indicated R134a and R125a have better overall performance than other candidates when the designed inlet temperature of the expander is higher than 150 °C. The highest net power and thermal efficiency are respectively 1.2 kW and 13% when R125a is used as the working fluid. R600 and R245fa are desirable to be used when the optimal rotational speed of the scroll expander is about 3000 RPM. The proposed ORC engine coolant and exhaust waste heat recovery system has the advantages of simple system layout, low dumped heat load of condenser, high power output.Organic Rankine Cycle; scroll expander; coolant and exhaust recovery; Internal Combustion Engine

Publication metadata

Author(s): Lu YJ, Roskilly AP, Jiang L, Yu XL

Publication type: Article

Publication status: Published

Journal: Energy Procedia

Year: 2017

Volume: 123

Pages: 346-352

Online publication date: 21/09/2017

Acceptance date: 26/07/2017

Date deposited: 13/09/2017

ISSN (electronic): 1876-6102

Publisher: Elsevier


DOI: 10.1016/j.egypro.2017.07.266

Notes: 1st International Conference on Sustainable Energy and Resource Use in Food Chains, ICSEF 2017, 19-20 April 2017, Berkshire, UK


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