Air leakage measurement and analysis in duct systems [An article from: Energy & Buildings]

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Description:
Air ducts and related equipments are used in a large number of buildings having thermal comfort. In this study, energy loss related with air leakage is studied. The leakage measurement setup was produced according to NEN-EN standards and the evaluation of data have been conducted by using power law model. The measurements were made on 300 and 1000mm diameter single circular ducts, 300mmx250mm and 1000mmx500mm flanged joint rectangular ducts, 300 and 630mm diameter circular beaded slip joint ducts, 300mmx200mm and 500mmx300mm rectangular flanged and drive slip joint ducts, and an branched air distribution system having different diameters for positive internal pressures. Test results have showed that the most of air leakage is from the joints. The seam contribution to air leakage is relatively lower than the joints. Using sealing gaskets help to improve the air leakage by about 50%.