Evaluation of Long-Term Thermal Resistance of Gas-filled Foams: State of the Art

Journal of Thermal Insulation

1990

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Insulation, 14, July, pp. 43-57, 1990-07 ABSTRACT: A test methodology that uses thcrmal 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 thcrmal performancc 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-14lb. Journal of ThermalExcept 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-141b showed long-term thermal performance similar to that of CFC-11 blown materials.

Section: Discussionmentioning

confidence: 99%

Thermal Performance of Sprayed Polyurethane Foam Insulation with Alternative Blowing Agents

Kumaran

Journal of Thermal Insulation

1990

“…Equation (1) gives the temperature at each node at time n + 1, using the values of X and T from the previous time step.…”

Section: Temperature Distributionmentioning

confidence: 99%

A Model of Aging for Gas-Filled Cellular Plastics

Journal of Cellular Plastics

1988

“…In the course of the investigation, it became apparent that the methods used in existing Canadian and American standards were not universally correlating laboratory and field performance [1,2]. This project aimed, therefore, at developing an accelerated test procedure, predicting long-term thermal performance of this foam product and comparing it with the field measurements.…”

Section: Introductionmentioning

confidence: 99%

Predicting Field Thermal Performance of a Modified Resol Foam from Laboratory Data

Journal of Thermal Insulation and Building Envelopes

1993

With safety testing of new blowing agents being near completion and new types of thermal insulating foams entering the market, predicting the longterm thermal performance of these foams becomes important. In this respect, the experience gained under a 1987-1988 project on CFC blown, modified resol foams may prove invaluable as predictions derived four years ago can now be compared with data obtained on material exposed on experimental roofs This comparison indicates that the prediction of long-term thermal performance based on the initial thermal resistance determined on full thickness specimens combined with the effect of aging determined on thin layers agreed with results obtained on the foam aged under field conditions INTRODUCTION