Thermal performance of sprayed polyurethane foam insulation with alternative blowing agents

Abstract

NA test methodology that uses thermal resistance-time curves determined on thin slices of the foam and the scaling technique to relate aging time to the specimen thickness, was applied to evaluate long-term thermal performance of six polyurethane foams manufactured with the same polymer but different blowing agents. The blowing agents employed were: CFC-11 with 0, 0.5, 1.0 or 1.5% water and HCFC-123 or HCFC-14 lb. Except for foams manufactured with CFC-11 and 1.0% or 1.5% of water, for which material inhomogeneity was higher than can be tolerated by the proposed test methodology, polyurethane foams manufactured with CFC-11 and 0.5% water, HCFC-123 and HCFC-14 lb showed long-term thermal performance similar to that of CFC-11 blown materials.Afin d'\ue9valuer la performance thermique \ue0 long terme de six mousses de polyur\ue9thane fabriqu\ue9es avec le m\ueame polym\ue8re mais des agents de glonflage diff\ue9rents, on s'est servi d'une m\ue9thodologie d'essais utilisant des courbes r\ue9sistance thermique-temps \ue9tablies \ue0 partir de minces tranches de mousse, ainsi que la technique de mise \ue0 \ue9chelle visant \ue0 d\ue9terminer le temps de vieillissement en fonction de l'\ue9paisseur de l'\ue9chantillon. Les agents de gonflage qui ont \ue9t\ue9 employ\ue9s sont : CFC-11 avec 0, 0,5, 1,0 ou 1,5 % d'eau et HCFC-123 ou HCFC-141b. Sauf dans le cas des mousses fabriqu\ue9 es avec CFC-11 et 1,0 ou 1,5 % d'eau, pour lesquelles le manque d'homog\ue9n\ue9it\ue9 du mat\ue9riau \ue9tait plus grand que ne peut le tol\ue9rer la m\ue9thodologie d'essais propos\ue9e, les mousses de polyur\ue9thane fabriqu\ue9es avec CFC-11 et 0,5 % d' eau, HCFC-123 ou HCFC-141b ont affich\ue9 une performance thermique \ue0 long terme semblable \ue0 celle des mat\ue9riaux gonfl\ue9 s au CFC-11.Peer reviewed: YesNRC publication: Ye

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Last time updated on 08/06/2016

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