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{Simpson:2018,
author = {Simpson, M and Pantaleo, AM and De, Palma P and Markides, C},
publisher = {ECOS},
title = {Design and thermo-economic optimisation of small-scale bottoming ORC systems coupled to biomass CHP gasification cycles},
url = {http://hdl.handle.net/10044/1/62185},
year = {2018}
}

RIS format (EndNote, RefMan)

TY  - CPAPER
AB - Optimisation of a small-scale bottoming organic Rankine cycle (ORC) engine is carried out for a combined biomass-gasifier-CHP system, drawing heat from the syngas conditioning unit of the gasifier and the exhaust gas of the internal combustion(IC) engine. The optimisation considers different working fluids and selection of a positive-displacement expander. Single-and two-stage screw expanders and single-stage reciprocating-piston expanders are modelled in order to capture the variation in their performance at a range of design points.Double-pipe heat exchangers are employed for both evaporator and condenser, leading to a low-cost but bulky design.The system is optimised first for maximum electrical power output, and second for minimum specific investment cost(SIC). Cost correlations are used for each of the principal ORC components. The optimal design for minimum SIC is found to be a two-stage screw expander withethanol as the working fluid, which produces a 13.6% increase in the electrical power output relative to the system without an ORC.The investment attractiveness of the whole system with and without the bottoming ORC is assessed and the system is found tobe profitable for avoided electricity costs above 150 $/MWheland biomass costs of 50 $/t, with the ORC making the system more attractive in all cases studied.Discounted payback periods range from 12years at 150 $/MWhelto 3.5years at 250 $/MWhelforthe system with ORC.
AU - Simpson,M
AU - Pantaleo,AM
AU - De,Palma P
AU - Markides,C
PB - ECOS
PY - 2018///
TI - Design and thermo-economic optimisation of small-scale bottoming ORC systems coupled to biomass CHP gasification cycles
UR - http://hdl.handle.net/10044/1/62185
ER -