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Phd-forsvar: “Life Cycle Cost Optimization of a BOLIG+ Zero Energy Building”

PhD-studerende Anna Joanna Marszal, Institut for Byggeri og Anlæg, forsvarer sin afhandling “Life Cycle Cost Optimization of a BOLIG+ Zero Energy Building” . Alle interesserede er velkomne.


07.02.2012 kl. 09.30 - 13.00


A new concept of energy consuming as well as energy producing building, labelled as Zero Energy Building (ZEB), is worldwide recognised as a promising solution that could change the picture of energy consumption in the building sector, and thus contribute to the reduction of the global energy use.
The ZEB concept is an energy-conservation solution, whose successful adaptation in real life depends significantly on private building owners’ approach to it. For this particular target group, the cost is often an obstacle when investing money in environmental or climate friendly products. Therefore, this PhD project deployed the Life Cycle Cost (LCC) methodology and took the perspective of a future private ZEB owner to investigate the cost-optimal Net ZEB definition applicable in the Danish context.
The investigations indicated that a comprehensive ZEB definition, aside being based on a general ZEB framework of a building with significantly reduced energy demand that is balanced by an equivalent energy generation from renewable sources, should clearly specify: (1) the connection or the lack of it to the energy infrastructure, (2) the unit of the balance, (3) the period of the balance, (4) the types of energy use included in the balance, (5) the minimum energy performance requirements (6) the renewable energy supply options, and if applicable (7) the requirements of the building-grid interaction.
The Life Cycle Cost (LCC) analysis conducted with a study case of a multi-storey residential Net ZEB - BOLIG+ resulted in conclusions that although the off-site options have lower life cycle costs than the on-site alternatives, their application would promote renewable technologies over energy efficiency measures. Thus, they oppose the Danish plans to gradually make the energy performance requirements stricter. Moreover, the results showed that district heating is a less cost-attractive solution than a ground source heat pump for a private building owner. Therefore, if district heating companies are to compete with the individual heat pumps in supplying heat to future Net ZEBs, a “new tariff” is recommended, which depends solely on the actual building heat consumption.



Aalborg Universitet


Sohngårdsholmsvej 57, F-108, 9000 Aalborg

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