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Publication Detail
Key factors determining the energy rating of existing
English houses
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Publication Type:Journal article
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Publication Sub Type:Article
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Authors:Stone A, Shipworth D, Biddulph P, Oreszczyn T
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Publisher:Taylor & Francis
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Publication date:02/05/2014
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Journal:Building Research & Information
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Keywords:building stock, energy rating, global sensitivity analysis, household energy, housing stock, modelling
Abstract
In the UK, the Standard Assessment Procedure (SAP) is used to rate the energy performance of existing dwellings
whenever they are let or sold. This study investigates which of the inputs to SAP account for the most variance in
energy rating across existing gas central heated houses in England. Data from the English Housing Survey (EHS)
2009 are used to generate a representative set of dwellings and variance-based global sensitivity analysis is then
applied to assess each input’s contribution to the variance in the calculated ratings. It is demonstrated that heating
system efficiency, external wall U-value and dwelling geometry account for 75% of the variance of the energy rating
of gas central heated houses in England. This suggests that improving heating system efficiencies and wall U-values of
the worst performing dwellings will go a long way towards improving their energy rating and potentially reducing
their energy consumption. It is also demonstrated that dwelling geometry has a much bigger influence on the
calculated carbon emissions (accounting for 80% of the variance) than it does on the SAP energy rating (accounting
for 30%), meaning that significant improvements in energy rating might not be accompanied by significant reductions
in carbon emissions.
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