Benchmarking of IRC's Advanced Hygrothermal Model - hygIRC Using Mid- and Large-Scale Experiments

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TypeTechnical Report
Series titleResearch Report, NRC Institute for Research in Construction; Volume 126
Physical description38 p.
SubjectHygrothermal properties
AbstractRecent research in the field of assessment of hygrothermal response has focused on either laboratory experimentation or modelling, but less work has been reported in which both aspects are combined. Such type of studies can potentially offer useful information regarding the benchmarking of models and related methods to assess hygrothermal performance of wall assemblies. An advanced hygrothermal computer model called hygIRC was used to assess the hygrothermal response of wood sheathing board, a keycomponent of wood-frame wall assemblies. hygIRC uses hygrothermal properties of materials derived from tests on small-scale specimens undertaken in the laboratory. The intent of this work was to obtain experimental results on the hygrothermal the response of the wood sheathing, included in both mid- and full-scale wall assemblies, when subjected to nominally steady-state environmental conditions. The drying rates of wall assemblies featuring several different membranes in contact with the wood sheathing were determined from experiments undertaken in a controlled laboratory setting. These results were subsequently compared to those obtained using hygIRC as a means of helping benchmark the simulation model. Conclusions from these studies are definite: in both mid and full-scale test, results from simulation compare very favourably with those obtained from the experiment. This realistically suggests that the model adequately emulates the hygrothermal response of specific wood-frame assembly components, such as wood sheathing, over a wide range of scales for the environmental conditions to which it was subjected in the experiments. These results further enhance confidence towards the implementation of hygIRC in broader based parametric studies.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number15178
NPARC number20378684
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Record identifier72dfe238-7b4a-40e3-9c17-5563bf1f7ee5
Record created2012-07-24
Record modified2016-10-03
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