dc.contributor.author
Cozza, Stefano
dc.contributor.author
Chambers, Jonathan
dc.contributor.author
Deb, Chirag
dc.contributor.author
Scartezzini, Jean-Louis
dc.contributor.author
Schlüter, Arno
dc.contributor.author
Patel, Martin K.
dc.date.accessioned
2020-07-07T07:13:58Z
dc.date.available
2020-07-02T02:52:11Z
dc.date.available
2020-07-07T07:13:58Z
dc.date.issued
2020-10-01
dc.identifier.issn
0378-7788
dc.identifier.issn
1872-6178
dc.identifier.other
10.1016/j.enbuild.2020.110235
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/424139
dc.identifier.doi
10.3929/ethz-b-000424139
dc.description.abstract
The thermal performance gap in buildings is defined as the difference between the theoretical and the actual energy consumption for heating, and is known to undermine energy retrofit strategies and policies. This study examines the performance gap in retrofitted buildings using the Swiss Cantonal Energy Certificate for Buildings (CECB) database, using a sample of 1172 buildings for which both theoretical and actual metered consumption were known. We found an average negative performance gap of –23% for pre-retrofit buildings (actual consumption smaller than calculated) and instead a good approximation of actual consumption with theoretical consumption after retrofitting (a positive gap of 2%). A regression analysis on the energy performance certificate input parameters characterizing the building led to the conclusion that these are poor predictors of actual consumption compared to the theoretical calculation: parameters such as the energy label and the thermal proprieties of the envelope (U-values) have minor explanatory power for the actual consumption despite explaining a high degree of change in the theoretical consumption. Analysis of the indicator Energy Savings Deficit (ESD) shows an overestimation (of 37%) of the achievable savings on the basis of the theoretical consumption, whereas the prediction of savings using measured consumption before retrofit resulted in a good agreement with the actual savings (3.6% overestimation). This implies that energy savings can be estimated rather accurately by comparing the actual current consumption with the expected theoretical consumption defined by the certificate after retrofit.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject
Building retrofit
en_US
dc.subject
Actual energy consumption
en_US
dc.subject
Performance gap
en_US
dc.subject
Energy Savings Deficit
en_US
dc.title
Do energy performance certificates allow reliable predictions of actual energy consumption and savings? Learning from the Swiss national database
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2020-06-17
ethz.journal.title
Energy and Buildings
ethz.journal.volume
224
en_US
ethz.journal.abbreviated
Energy build.
ethz.pages.start
110235
en_US
ethz.size
14 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.scopus
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2020-07-02T02:52:18Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-07-07T07:14:19Z
ethz.rosetta.lastUpdated
2020-07-07T07:14:19Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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