Cost-optimal energy performance measures in a new daycare building in cold climate

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-02-07
Major/Subject
Mcode
Degree programme
Language
en
Pages
19
1-19
Series
International Journal of Sustainable Energy
Abstract
New municipal service buildings must be energy effective, and cost-optimality is one of the criteria for selecting the suitable energy performance improvement measures. A daycare building in a cold climate was studied by means of simulation-based, multi-objective optimisation. Using a genetic algorithm, both target energy use and life-cycle cost of the selected measures were minimised. It was found that extensive insulation of the building envelope is not a cost-optimal method to reduce the daycare building energy use. Improving energy efficiency of the ventilation system, utilising solar energy on-site and employing a light control strategy are preferable ways of improving the building energy performance. Ground-source heat pump is a more cost-optimal heating system for the daycare building than district heating. The cost-optimal sizing of the heat pump is small, only 28% of the required maximum heating power. Abbreviations: AHU: air handling unit; CAV: constant air volume; COMBI: comprehensive development of nearly zero-energy municipal service buildings; COP: coefficient of performance; DH: district heating; DHW: domestic hot water; EPBD: energy performance of buildings directive; EU: European Union; FINVAC: Finnish Association of HVAC Societies; GSHP: ground-source heat pump; HRU: heat recovery unit; IDA ICE: IDA Indoor Climate and Energy; LED: light-emitting diode; MOBO: multi-objective building optimisation tool; NSGA-II: Non-dominated Sorting Genetic Algorithm II; nZEB: nearly zero-energy building; PV: photovoltaic; TRY: test reference year; VAV: variable air volume; ZEB: zero-energy building
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Keywords
Building simulation, daycare building, life-cycle cost, multi-objective optimisation, simulation-based optimisation, target energy use
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Citation
Sankelo , P , Jokisalo , J , Nyman , J , Vinha , J & Sirén , K 2019 , ' Cost-optimal energy performance measures in a new daycare building in cold climate ' , International Journal of Sustainable Energy , vol. 38 , no. 2 , pp. 104-122 . https://doi.org/10.1080/14786451.2018.1448398