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

@inproceedings{Oyewunmi:2015,
author = {Oyewunmi, OA and Markides, CN},
publisher = {University of Liège and Ghent University},
title = {EFFECT OF WORKING-FLUID MIXTURES ON ORGANIC RANKINE CYCLE SYSTEMS: HEAT TRANSFER AND COST ANALYSIS},
url = {http://hdl.handle.net/10044/1/31458},
year = {2015}
}

RIS format (EndNote, RefMan)

TY  - CPAPER
AB - The present paper considers the employment of working-fluid mixtures in organic Rankine cycle (ORC)systems with respect to heat transfer performance, component sizing and costs, using two sets of fluidmixtures: n-pentane + n-hexane and R-245fa + R-227ea. Due to their non-isothermal phase-change behaviour,these zeotropic working-fluid mixtures promise reduced exergy losses, and thus improved cycleefficiencies and power outputs over their respective pure-fluid components. Although the fluid-mixturecycles do indeed show a thermodynamic improvement over the pure-fluid cycles, the heat transfer andcost analyses reveal that they require larger evaporators, condensers and expanders; thus, the resultingORC systems are also associated with higher costs, leading to possible compromises. In particular,70 mol% n-pentane + 30 mol% n-hexane and equimolar R-245fa + R-227ea mixtures lead to the thermodynamicallyoptimal cycles, whereas pure n-pentane and pure R-227ea have lower costs amounting to14% and 5% per unit power output over the thermodynamically optimal mixtures, respectively.
AU - Oyewunmi,OA
AU - Markides,CN
PB - University of Liège and Ghent University
PY - 2015///
TI - EFFECT OF WORKING-FLUID MIXTURES ON ORGANIC RANKINE CYCLE SYSTEMS: HEAT TRANSFER AND COST ANALYSIS
UR - http://hdl.handle.net/10044/1/31458
ER -