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A comparison of an energy/economic-based against an exergoeconomic-based multi-objective optimisation for low carbon building energy design

García Kerdan, I; Raslan, R; Ruyssevelt, P; Morillón Gálvez, D; (2017) A comparison of an energy/economic-based against an exergoeconomic-based multi-objective optimisation for low carbon building energy design. Energy , 128 pp. 244-263. 10.1016/j.energy.2017.03.142. Green open access

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Abstract

This study presents a comparison of the optimisation of building energy retrofit strategies from two different perspectives: an energy/economic-based analysis and an exergy/exergoeconomic-based analysis. A recently retrofitted community centre is used as a case study. ExRET-Opt, a novel building energy/exergy simulation tool with multi-objective optimisation capabilities based on NSGA-II is used to run both analysis. The first analysis, based on the 1st Law only, simultaneously optimises building energy use and design's Net Present Value (NPV). The second analysis, based on the 1st and the 2nd Laws, simultaneously optimises exergy destructions and the exergoeconomic cost-benefit index. Occupant thermal comfort is considered as a common objective function for both approaches. The aim is to assess the difference between the methods and calculate the performance among main indicators, considering the same decision variables and constraints. Outputs show that the inclusion of exergy/exergoeconomics as objective functions into the optimisation procedure has resulted in similar 1st Law and thermal comfort outputs, while providing solutions with less environmental impact under similar capital investments. This outputs demonstrate how the 1st Law is only a necessary calculation while the utilisation of the 1st and 2nd Laws becomes a sufficient condition for the analysis and design of low carbon buildings.

Type: Article
Title: A comparison of an energy/economic-based against an exergoeconomic-based multi-objective optimisation for low carbon building energy design
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.energy.2017.03.142
Publisher version: https://doi.org/10.1016/j.energy.2017.03.142
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Optimisation; Building simulation; Energy; Exergy; Low carbon buildings; Exergoeconomics
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources
URI: https://discovery.ucl.ac.uk/id/eprint/1549416
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