Imperial College London

Prof. Sandro Macchietto

Faculty of EngineeringDepartment of Chemical Engineering

Professor of Process Systems Engineering
 
 
 
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Contact

 

+44 (0)20 7594 6608s.macchietto Website

 
 
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Assistant

 

Miss Nazma Mojid +44 (0)20 7594 3918

 
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Location

 

ACEX 507ACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Gangar:2020:10.3390/en13102560,
author = {Gangar, N and Macchietto, S and Markides, C},
doi = {10.3390/en13102560},
journal = {Energies},
pages = {2560--2560},
title = {Recovery and utilization of low-grade waste heat in the oil-refining industry using heat engines and heat pumps: an international technoeconomic comparison},
url = {http://dx.doi.org/10.3390/en13102560},
volume = {13},
year = {2020}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - We assess the technoeconomic feasibility of onsite electricity and steam generation from recovered low-grade thermal energy in oil refineries using organic Rankine cycle (ORC) engines and mechanical vapour compression (MVC) heat pumps in various countries. The efficiencies of 34 ORC and 20 MVC current commercial systems are regressed against modified theoretical models. The resulting theoretical relations predict the thermal efficiency of commercial ORC engines within 4–5% and the coefficient of performance (COP) of commercial MVC heat pumps within 10–15%, on average. Using these models, the economic viability of ORC engines and MVC heat pumps is then assessed for 19 refinery streams as a function of heat source and sink temperatures, and the available stream thermal energy, for gas and electricity prices in selected countries. Results show that: (i) conversion to electrical power with ORC engines is, in general, economically feasible for heat-source temperatures >70 C, however with high sensitivity to energy prices; and (ii) steam generation in MVC heat pumps, even more sensitive to energy prices, is in some cases not economical under any conditions—it is only viable with high gas/low electricity prices, for large heat sources (>2 MW) and higher temperatures (>140 C). In countries and conditions with positive economics, payback periods down to two years are found for both technologies.
AU - Gangar,N
AU - Macchietto,S
AU - Markides,C
DO - 10.3390/en13102560
EP - 2560
PY - 2020///
SN - 1996-1073
SP - 2560
TI - Recovery and utilization of low-grade waste heat in the oil-refining industry using heat engines and heat pumps: an international technoeconomic comparison
T2 - Energies
UR - http://dx.doi.org/10.3390/en13102560
UR - http://www.imperial.ac.uk/people/c.markides
UR - http://www.mdpi.com/journal/energies
UR - http://hdl.handle.net/10044/1/80041
VL - 13
ER -