The effect of window-wall interface details on window condensation potential

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Proceedings titleBEST 3 2012: Building Enclosure Science and Technology Conference Proceedings
ConferenceBuilding Enclosure Council Science and Technology 3 (BEST 3) Conference: High Performance Building - Combining Field Experience and Innovation, April 2-4, 2012, Atlanta, GA.
Pages16; # of pages: 6
SubjectLaboratory test; condensation; window-wall interface; box-window
AbstractConsidering all building components, windows typically have the lowest surface temperature, and will consequently be the primary location for interior surface condensation. Those surface temperatures can easily be calculated using thermal finite-element-models (FEM), and there is an ISO standard with guidelines for condensation risk assessment. However, both the FEM-simulations as the ISO standard generally omit the effect of air flows in and around window frames. When cold air is drawn into the construction, the airflow might cool down specific components of the window-wall interface depending on the location of the airflow path. Consequently, the current evaluation method for condensation risk assessment based on FEM-simulations might underestimate the actual risk. There is a need to determine if interface details become more susceptible for surface condensation due to pressure differences over the component. This paper reports on a laboratory evaluation of condensation risk assessment in a hotbox, with varying pressure differences and the introduction of deficiencies. It was concluded that the effect of the type of insulation in the window-wall interface was very low for isobaric boundary conditions, whereas it has a significant effect when pressure differences are applied. A full paper on this topic has been accepted for publication by the Journal of Building Physics.
Publication date
AffiliationConstruction; National Research Council Canada
Peer reviewedYes
NRC number55277
NPARC number21239619
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Record identifier60e85cc5-3cf7-47e0-830c-d3129759d643
Record created2013-02-14
Record modified2016-05-09
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