Method to determine the dynamic thermal resistance of compressed air foam

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Conference12th Symposium for Building Physics: 29 March 2007, Dresden, Germany
Pages19; # of pages: 9
Subjectexperiment, insulation foam, dynamic thermal resistance; Foam
AbstractCompressed air foams have been developed in recent years for a number of uses, including fire suppression and dynamic insulation for transparent or translucent enclosures. In its thermal insulation role, the product has been developed to be deployed at night and removed during the daytime, to maximize the use of daylight for greenhouse applications while potentially reducing heat loss at night. Standard test methods for the thermal resistance of products are currently based on the assumption that the thermal resistance of the material is constant over the duration of the test ? an assumption that cannot be made with compressed air foams. A manufacturer of such foams approached the Institute for Research in Construction (IRC) to develop a technique to evaluate the dynamic thermal resistance of foams that are intended to be deployed on a temporary basis over a fraction of a day. As a result, IRC entered into an experimental program to develop an appropriate method for determining the thermal resistance of dynamic foam insulation under controlled laboratory conditions. This was done by building a special wall specimen to house the foam insulation, making provisions for foaming of the wall specimen during the test, deploying instrumentation in such a way as to capture the dynamic behaviour of the foam, while shedding some understanding of the spatial variations in the delivered foam insulation. The resulting method is an adaptation of a standard ASTM test method for Guarded Hot Box testing, modified to derive a time-integrated thermal resistance over a specified test period. This project resulted in the development of a test protocol to determine the apparent thermal resistance of dynamic foam material. In addition to applying the technique to the manufacturer's proprietary foams, the method was applied to proprietary compressed air foam developed by IRC for other purposes, to assess the dynamic thermal properties of that foam. The results of the latter are reported in this paper.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number49222
NPARC number20377923
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Record identifierb06f36a8-dca0-42ab-b6df-ac6b2763e6e1
Record created2012-07-24
Record modified2016-05-09
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