A Review of Techniques for Improved Foam Conductivity : Reducing Radiation Heat Transfer, Limiting Aging and Inclusion of Vacuum Elements / LR. Glicksman, M. Burke, A. Marge, M. Mozgowiec
- Conference Author:
- Insulation Materials: Testing and Applications, 2nd Volume (2nd : 1991 : Gatlinburg, TN)
- Physical Description:
- 1 online resource (23 pages) : illustrations, figures, tables
- Additional Creators:
- Burke, M.
American Society for Testing and Materials
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- To comply with international agreement closed cell polyurethane and polyisocyanerate foams must be made with blowing agents which minimize ozone depletion in the stratosphere. Candidate blowing agents have higher vapor conductivities resulting in lower R values for the foams. This paper reviews recent results of research at M.I.T. sponsored by the Department of Energy and the Environmental Protection Agency to find means to recover high R values. Use of small opaque particles or smaller foam cells reduces the radiative transfer in foams which is usually one third of the total heat transfer at standard conditions. The thermal aging of foams made with new blowing agents is a function of the permeability which has been measured for several new materials. The rate of aging can be reduced by proper use of diffusion barriers on the foam surface. The inclusion of vacuum elements in foam should increase the overall R value. A key problem is to find packaging materials for the vacuum elements which preserve the vacuum over the insulation life while not causing substantial secondary heat transfer around the circumference of the element.
- Dates of Publication and/or Sequential Designation:
- Volume 1991, Issue 1116 (January 1991)
- 9780803151741 (e-ISBN)
- Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 13.
- Other Forms:
- Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
- Reproduction Note:
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1991. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
- Technical Details:
- Mode of access: World Wide Web.
- Source of Acquisition:
- ASTM International PDF Purchase price USD25.
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