Imperial College London
Alternate

ProfessorChristosMarkides

Faculty of Engineering, Department of Chemical Engineering

Professor of Clean Energy Technologies
 
 
 
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Contact

 

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

 
 
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Location

 

404ACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Chatzopoulou:2018:10.1016/j.apenergy.2018.06.022,
author = {Chatzopoulou, MA and Markides, C},
doi = {10.1016/j.apenergy.2018.06.022},
journal = {Applied Energy},
pages = {1229--1251},
title = {Thermodynamic optimisation of a high-electrical efficiency integrated internal combustion engine – organic Rankine cycle combined heat and power system},
url = {http://dx.doi.org/10.1016/j.apenergy.2018.06.022},
volume = {226},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Organic Rankine cycle (ORC) engines are suitable for heat recovery from internal combustion engines (ICE) in combined heat and power (CHP) systems. However, trade-offs must be considered between ICE andORC engine performance in such integrated solutions. The ICE design and operational characteristics influence its own performance along withthe exhaust-gas conditions available as heat source to the ORC engine, impacting ORC design and performance, while the heat-recovery heat exchanger (ORC evaporator) will affect the ICE operation. In this paper, an integrated ICE-ORC CHP whole-system optimisation framework is presented. This differs  from  other  efforts in  that  we  develop  and  apply  a  fully-integrated  ICE-ORC  CHP  optimisation framework, considering the design and operation of both the ICE and ORC enginessimultaneously within the combined system, to  optimise  the  overall  system  performance. A dynamic ICE model is developed and validated, along with a steady-state model of subcritical recuperative ORC engines. Both naturally aspirated and turbocharged ICEs are considered, of two different sizes/capacities. Nine substances (covering low-GWP refrigerants and hydrocarbons) are investigated as  potential ORC working fluids. The integrated  ICE-ORC CHP  system isoptimised  for eithermaximum total power  output, or minimum fuel  consumption. Resultshighlight that by optimising the complete integrated ICE-ORC CHP system simultaneously, the total power output increases by up to 30% in comparison to a nominal system design. In the integrated CHP system,the ICE power output is slightly lower than that obtained for optimal standalone ICE application, as the exhaust-gas temperature increases to promote the bottoming ORC engine performance, whose power increasesby 7%. The ORC power output achieved accounts for up to 15% of the total power generated by the integrated system, increasing the system efficiency by up to 11%. When only power optimisation is performed, the
AU  - Chatzopoulou,MA
AU  - Markides,C
DO  - 10.1016/j.apenergy.2018.06.022
EP  - 1251
PY  - 2018///
SN  - 0306-2619
SP  - 1229
TI  - Thermodynamic optimisation of a high-electrical efficiency integrated internal combustion engine – organic Rankine cycle combined heat and power system
T2  - Applied Energy
UR  - http://dx.doi.org/10.1016/j.apenergy.2018.06.022
UR  - http://hdl.handle.net/10044/1/61095
VL  - 226
ER  -
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