Détail de la notice
Titre du Document
Air intrusion effects on the performance of permeable insulation systems
Auteur(s)
BERLAD A. L. ; TUTU N. ; YEH Y.-J. ; ...
Résumé
The R-values of permeable insulation systems are generally determined in test apparatuses designed to assure one-dimensional heat transfer and to assure no air intrusion effects. Such classical R-values are then calculationally employed to help describe in situ heat-transfer rates through insulation systems. The research reported herein reexamines the applicability of these classical R-values to commonly encountered insulation systems where air intrusion is physically possible. Several kinds of findings are reported: (a) Laboratory-determined R-values for several types and thicknesses of permeable insulators, under conditions of no externally imposed flows. (b) Laboratory-determined heat-transfer rates for several permeable insulators under conditions of externally imposed flows (air intrusion). (c) Theoretically calculated heat-transfer rates for permeable insulation systems which sustain infiltrative-exfiltrative air intrusion effects. The results obtained show that the thermal insulation provided by a permeable insulation system may differ substantially from that which is predicted by simple application of classical R-values.
Editeur
American Society for Testing and Materials
Identifiant
ISSN : 0066-0558 CODEN : ASTTA8
Source
ASTM special technical publication A. 1980, n° 718, pp. 181-194 [14 pages]
Langue
Anglais
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