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Page, Jason and Brotas, Luisa (2013) Performance analysis of a zero carbon housing development. In: 3rd Masters Conference 2013 People and Buildings, 20 September 2013, London, UK.
This paper presents a post occupational analysis of a zero carbon housing development in respect to energy use for hot water and space heating. The study found that the dwellings maintained a comfortable environment throughout the year however showed that there was a significant performance gap between predicted energy use from SAP 2009 and measured energy use. The gap was however the inverse of a traditional performance gap where the actual dwellings outperformed the predicted. This “negative performance gap” was shown to be as much as half of the predicted energy use. As post occupational analysis of housing is rare in the UK and rarer for low energy housing, this could point towards low energy dwellings being over designed due to significant carbon emissions in the calculations relating to an energy use that doesn’t exist. These findings pose significant questions on the ability of the current form of SAP to accurately model low energy dwellings.
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