Decreasing the carbon footprint of energy efficientbuildings, what comes next?
2013 (English)In: Passivhus Norden 2013, 2013Conference paper (Refereed)
A full LCA was conducted to explore the contribution from each life cycle stage to the carbonfootprint of energy efficient buildings, and the role of bio-based materials as future potentialalternatives to decrease further carbon emissions in the building sector. Eight different designalternatives with comparable functionality were evaluated for Wälluden, a four-storey multi-familybuilding in Växjö, Sweden. The designs include three different building systems; volumetric modules,massive timber structural elements and a column-beam structure as well as the original design of thebuilding from 1995 both with wood and concrete frame structures. The three new designs weremodelled under conventional and passive house energy efficiency categories. A square meter ofliving area was used as the functional unit, and a service life of one hundred years was assumed. Theanalysis includes processes from raw material extraction, manufacturing of building materials,construction, energy generation for the use phase, selected maintenance activities, demolition anddisposal of the building waste. Concrete carbonation phenomena, carbon storage and end-usebenefits from substituting fossil energy effects with wood material waste were also explored. Theresults show that the benefits of more use phase energy efficient designs are significant, but as theuse-phase impact lowers and there is less improvement potential; both the production and end-usephase become more relevant. Indeed, for the passive house design, the production phase carbonfootprint is of the same order as for a one hundred years use phase. For the production phase,increasing the share of bio-based products can decrease significantly the carbon footprint of theproduction phase of a building, no matter which building system is chosen. Bio-based materials havehigher potential environmental benefits for the end-use phase, even as there are uncertainties overthe fate of materials in future waste management systems.
Place, publisher, year, edition, pages
Life Cycle Assessment, Carbon Footprint, Wood Construction, Low-Emission buildings, Passive House
IdentifiersURN: urn:nbn:se:kth:diva-161212OAI: oai:DiVA.org:kth-161212DiVA: diva2:794022
Passivhus Norden 2013, Göteborg, Sweden
QC 201503102015-03-102015-03-102015-03-10Bibliographically approved