The role of the fuctional equivalence in LCA of buildings and building products presented by Michele Paleari International Symposium LCA & Construction . Nantes . 10 July 2012 Monica Lavagna Politecnico di Milano BEST Dep. - Building Environment Science and Technologies Italy
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The role of the fuctional equivalence in LCA of buildings and
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The role of the fuctional equivalence in LCA
of buildings and building products
presented by Michele Paleari
International Symposium LCA & Construction . Nantes . 10 July 2012
Monica Lavagna
Politecnico di Milano BEST Dep. - Building Environment Science and Technologies
Italy
objective of the presentation
Comparative LCA of buildings products or technical sys tems
Functional unit / Functional equivalence
(what kind of performances? It depends from the buildi ng)
Comparative LCA of buildings
Normalisation of results assuming a Reference unit
(what kind of unit? surface, volume, durability …)
Change of functional unit or reference unit = change o f LCA results
LCA & Construction 2012 . Nantes . monica lavagna . politecnico di milano . dipartimento best . [email protected]
LCA comparison of building’s products
Comparative study and functional equivalence
Reference flows . functional equivalent . same level of service
LCA & Construction 2012 . Nantes . monica lavagna . politecnico di milano . dipartimento best . [email protected]
What kind of performance?
Uncertainty of reference flow
Uncertainty of LCA comparison
The functional equivalent in a LCA-based comparison of products
functional equivalent = performance more relevant
LCA & Construction 2012 . Nantes . monica lavagna . politecnico di milano . dipartimento best . [email protected]
Example
Product: insulation materials
Relevant performance: heat insulation
The functional equivalent in a LCA-based comparison of products
And the other performances?
LCA & Construction 2012 . Nantes . monica lavagna . politecnico di milano . dipartimento best . [email protected]
Sound insulation
Durability
Fire resistance
Structural stability
Flexibility of use
Thermal inertia
Breathability
Water resistance
…
The functional equivalent in a LCA-based comparison of products
There aren't eco-friendly products in an absolute sense ,
but a product can be defined ecological only in relat ion with
the performance required in a specific building
LCA & Construction 2012 . Nantes . monica lavagna . politecnico di milano . dipartimento best . [email protected]
functional unit: thermal transmittance of 0,34 W/m2K and periodic thermal trasmittance of 0,12 (limit value according to italian Legislative Decree no. 311/06) of 1 m2 of opaque vertical closure