Imperial College London


Faculty of EngineeringDepartment of Chemical Engineering

Professor of Clean Energy Technologies



+44 (0)20 7594 1601c.markides Website




404ACE ExtensionSouth Kensington Campus






BibTex format

author = {Oyewunmi, OA and Pantaleo, AM and markides, CN},
publisher = {Elsevier},
title = {ORC cogeneration systems in waste-heat recovery applications},
url = {},
year = {2017}

RIS format (EndNote, RefMan)

AB - The performance of organic Rankine cycle (ORC) systems operating in combined heat and power (CHP) mode is investigated. TheORC-CHP systems recover heat from selected industrial waste-heat fluid streams with temperatures in the range 150 °C – 330 °C. Anelectrical power output is provided by the expanding working fluid in the ORC turbine, while a thermal output is provided by the coolingwater exiting the ORC condenser and also by a second heat-exchanger that recovers additional thermal energy from the heat-sourcestream downstream of the evaporator. The electrical and thermal energy outputs emerge as competing objectives, with the latter favouredat higher hot-water outlet temperatures and vice versa. Pentane, hexane and R245fa result in ORC-CHP systems with the highest exergyefficiencies over the range of waste-heat temperatures considered in this work. When maximizing the exergy efficiency, the second heatexchangeris effective (and advantageous) only in cases with lower heat-source temperatures (< 250 °C) and high heat-delivery/demandtemperatures (> 60 °C) giving a fuel energy savings ratio (FESR) of over 40%. When maximizing the FESR, this heat exchanger isessential to the system, satisfying 100% of the heat demand in all cases, achieving FESRs between 46% and 86%.
AU - Oyewunmi,OA
AU - Pantaleo,AM
AU - markides,CN
PB - Elsevier
PY - 2017///
SN - 1876-6102
TI - ORC cogeneration systems in waste-heat recovery applications
UR -
ER -