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Parametric study for small scale engine coolant and exhaust heat recovery system using different Organic Rankine cycle layouts

Lookup NU author(s): Dr Yiji Lu, Professor Tony Roskilly, Ke Tang, Dr Long Jiang, Dr Andrew Smallbone, Dr Yaodong Wang



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


This paper presents the study of four different engine coolant and exhaust heat recovery Organic Rankine Cycle systems using R245fa as working fluid and scroll expander as expansion machine. The parametric investigation suggested the fluid superheating temperature has limited influence on the simple structured ORC system (ORC_sim) with overall efficiency about 6.2% and average produced power around 0.59 kW under engine rated condition. The maximum rotational speed of the scroll expander is around 4000 rpm under different ratio of coolant and exhaust ratio of the Yanmar engine (6.8 kW), which means the designed ORC system can be easily used for electricity generation by directly connecting expander shaft to a conventional electrical generator. The BSFC reduction ratios of ICE + ORC_sim, ICE + ORCR_1 and ICE + ORC_pre under engine rated power are respectively 6.1%, 7.4% and 5.2%. And the overall effective energy efficiency by integrating ORC_sim, ORCR_1 and ORC_pre to the ICE can be improved by 6.5%, 8.0% and 5.4% under engine rated power condition.

Publication metadata

Author(s): Lu YJ, Roskilly AP, Yu XL, Tang K, Jiang L, Smallbone A, Chen LF, Wang YD

Publication type: Article

Publication status: Published

Journal: Applied Thermal Engineering

Year: 2017

Volume: 127

Pages: 1252-1266

Print publication date: 25/12/2017

Online publication date: 30/08/2017

Acceptance date: 27/08/2017

Date deposited: 04/09/2017

ISSN (print): 1359-4311

ISSN (electronic): 1873-5606

Publisher: Elsevier


DOI: 10.1016/j.applthermaleng.2017.08.128


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