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{van:2019:10.1016/j.apenergy.2019.01.071,
author = {van, Kleef L and Oyewunmi, O and Markides, C},
doi = {10.1016/j.apenergy.2019.01.071},
journal = {Applied Energy},
title = {Multi-objective thermo-economic optimization of organic Rankine cycle (ORC) power systems in waste-heat recovery applications using computer-aided molecular design techniques},
url = {http://dx.doi.org/10.1016/j.apenergy.2019.01.071},
volume = {251},
year = {2019}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - In this paper, we develop a framework for designing optimal organic Rankine cycle (ORC) power systems that simultaneously considers both thermodynamic and economic objectives. This methodology relies on computeraided molecular design (CAMD) techniques that allow the identification of an optimal working fluid during the thermo-economic optimization of the system. The SAFT-γ Mie equation of state is used to determine the necessary thermodynamic properties of the designed working fluids, with critical and transport properties estimated using empirical group-contribution methods. The framework is then applied to the design of sub-critical and non-recuperated ORC systems in different applications spanning a range of heat-source temperatures. When minimizing the specific investment cost (SIC) of these systems, it is found that the optimal molecular size of the working fluid is linked to the heat-source temperature, as expected, but also that the introduction of a minimum pinch point constraint that is commonly employed to account for inherent trade-offs between system performance and cost is not required. The optimal SICs of waste-heat ORC systems with heat-source temperatures of 150 °C, 250 °C and 350 °C are £10,120/kW, £4,040/kW and £2,910/kW, when employing propane, 2-butane and 2- heptene as the working fluids, respectively. During a set of MINLP optimizations of the ORC systems with heatsource temperatures of 150 °C and 250 °C, it is found that 1,3-butadiene and 4-methyl-2-pentene are the bestperforming working fluids, respectively, with SICs of £9,640/kW and £4,000/kW. These substances represent novel working fluids for ORC systems that cannot be determined a priori by specifying any working-fluid family or by following traditional methods of testing multiple fluids. Interestingly, the same molecules are identified in a multi-objective optimization considering both the total investment cost and net power output
AU - van,Kleef L
AU - Oyewunmi,O
AU - Markides,C
DO - 10.1016/j.apenergy.2019.01.071
PY - 2019///
SN - 0306-2619
TI - Multi-objective thermo-economic optimization of organic Rankine cycle (ORC) power systems in waste-heat recovery applications using computer-aided molecular design techniques
T2 - Applied Energy
UR - http://dx.doi.org/10.1016/j.apenergy.2019.01.071
UR - http://hdl.handle.net/10044/1/65621
VL - 251
ER -