Imperial College London

ProfessorChristosMarkides

Faculty of EngineeringDepartment 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{Song:2020:10.1016/j.enconman.2020.112999,
author = {Song, J and Li, X and Wang, K and Markides, CN},
doi = {10.1016/j.enconman.2020.112999},
journal = {Energy Conversion and Management},
pages = {1--15},
title = {Parametric optimisation of a combined supercritical CO2 (S-CO2) cycle and organic Rankine cycle (ORC) system for internal combustion engine (ICE) waste-heat recovery},
url = {http://dx.doi.org/10.1016/j.enconman.2020.112999},
volume = {218},
year = {2020}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Supercritical CO2 (S-CO2) power-cycle systems are a promising technology for waste-heat recovery from internal combustion engines (ICEs). However, the effective utilisation of the heat from both the exhaust gases and cooling circuit by a standalone S-CO2 cycle system remains a challenge due to the unmatched thermal load of these heat sources, while a large amount of unexploited heat is directly rejected in the system’s pre-cooler. In this paper, a combined-cycle system for ICE waste-heat recovery is presented that couples an S-CO2 cycle to a bottoming organic Rankine cycle (ORC), which recovers heat rejected from the S-CO2 cycle system, as well as thermal energy available from the jacket-water and exhaust-gas streams that have not been utilised by the S-CO2 cycle system. Parametric optimisation is implemented to determine operating conditions for both cycles from thermodynamic and economic perspectives. With a baseline case using a standalone S-CO2 cycle system for an ICE with a rated power output of 1170 kW, our investigation reveals that the combined-cycle system can deliver a maximum net power output of 215 kW at a minimum specific investment cost (SIC) of 4670 $/kW, which are 58% and 4% higher than those of the standalone S-CO2 cycle system, respectively. A range of ICEs of different sizes are also considered, with significant performance improvements indicating a promising potential of exploiting such combined-cycle systems. This work motivates the pursuit of further performance improvements to waste-heat recovery systems from ICEs and other similar applications.
AU - Song,J
AU - Li,X
AU - Wang,K
AU - Markides,CN
DO - 10.1016/j.enconman.2020.112999
EP - 15
PY - 2020///
SN - 0196-8904
SP - 1
TI - Parametric optimisation of a combined supercritical CO2 (S-CO2) cycle and organic Rankine cycle (ORC) system for internal combustion engine (ICE) waste-heat recovery
T2 - Energy Conversion and Management
UR - http://dx.doi.org/10.1016/j.enconman.2020.112999
UR - https://www.sciencedirect.com/science/article/pii/S0196890420305434?via%3Dihub
UR - http://hdl.handle.net/10044/1/79595
VL - 218
ER -