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A comparison of standardized calculation methods for in situ measurements of facades U-value

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A comparison of standardized calculation methods for in situ measurements of façades U-value_ENB_post print.pdf (742,6Kb)
 
10.1016/j.enbuild.2016.08.072
 
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hdl:2117/132231

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Gaspar Fàbregas, KàtiaMés informacióMés informacióMés informació
Casals Casanova, MiquelMés informacióMés informacióMés informació
Gangolells Solanellas, MartaMés informacióMés informacióMés informació
Document typeArticle
Defense date2016-10-15
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
This work is protected by the corresponding intellectual and industrial property rights. Except where otherwise noted, its contents are licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
In recent years, a growing concern has been how to determine the actual thermal behaviour of façades in their operational stage, in order to establish appropriate energy-saving measures. This paper aims at comparing standardized methods for obtaining the actual thermal transmittance of existing buildings’ façades, specifically the average method and the dynamic method defined by ISO 9869-1:2014, to verify which best fits theoretical values. The paper also aims to promote the use of the dynamic method, and facilitate its implementation. Differences between the theoretical U-value and the measured U-value obtained using the average and dynamic methods were calculated in three case studies, and then compared. The results showed that differences between the theoretical and the measured U-value were lower when the dynamic method was used. Particularly, when testing conditions were not optimal, the use of the dynamic method significantly improved the fit with the theoretical value. Moreover, measurements of the U-value using the dynamic method with a sufficiently large dataset showed a better fit to the theoretical U-value than the results of other dynamic methods proposed by authors. Further research should consider the optimum size of the dataset to obtain a measured U-value that is correctly adjusted to the theoretical U-value.
CitationGaspar, K.; Casals, M.; Gangolells, M. A comparison of standardized calculation methods for in situ measurements of facades U-value. "Energy and buildings", 15 Octubre 2016, vol. 130, p. 592-599. 
URIhttp://hdl.handle.net/2117/132231
DOI10.1016/j.enbuild.2016.08.072
ISSN0378-7788
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