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Abstract
CFCs have been the subject of worldwide attention because of the stratospheric ozone issue and the related international agreement on control measures for ozone protection, known as the Montreal Protocol. Review provisions of this protocol have established the phase-out deadline for the controlled CFCs by the year 2000 except for a delay of 10 years for developing countries. Some European community and other countries are adopting even stricter time tables, with phase-out ranging from 1995 to 1997. In the U.S., the time tables in the Montreal Protocol have been reinforced by adoption of the Clean Air Act of 1990, which in addition sets a production freeze in 2015 and a ban in 2030 for HCFC. Industry sources in the U.S. indicate that the transition away from CFCs in polyisocyanuratre foam insulation products will be much quicker than mandated, with 1994 as the target year. This is a significant achievement because of the wide-spread use of this product in the U.S. This early transition is partly possible because of an aggressive industry-led research agenda. One important element in this agenda is a joint roofing industry-government study to examine the relative thermal and physical properties, and installation and performance characteristics of polyisocyanurate boardstock foams with alternate blowing agents compared to a foam blown with CFC-11. Participants in this study include the CFC producers through the Society of Plastics Industry, the foam manufacturers through Polyisocyanurate Insulation Manufacturers Association and the government through the U.S. Department of Energy and the EPA. This group first met in a series of two industry-wide workshops on CFC replacement research priorities. This was followed by a joint multifaceted, industry- government project, initiated in 1989. This report focuses on one aspect of the joint project. It is an update on a series of long-term tests with comparisons to lab results at Oak Ridge National Lab (ORNL) in Oak Ridge, Tenn. Other elements of the project have been reported previously. The objective of these particular outdoor tests is to examine the long-term thermal performance of conventional foams with CFC-11 compared to foams with HCFC-123, HCFC-14lb and blends of the latter two. In addition, the tests provide benchmark field performance against which lab thermal aging results can be compared.
CFCs have been the subject of worldwide attention because of the stratospheric ozone issue and the related international agreement on control measures for ozone protection, known as the Montreal Protocol. Review provisions of this protocol have established the phase-out deadline for the controlled CFCs by the year 2000 except for a delay of 10 years for developing countries. Some European community and other countries are adopting even stricter time tables, with phase-out ranging from 1995 to 1997. In the U.S., the time tables in the Montreal Protocol have been reinforced by adoption of the Clean Air Act of 1990, which in addition sets a production freeze in 2015 and a ban in 2030 for HCFC. Industry sources in the U.S. indicate that the transition away from CFCs in polyisocyanuratre foam insulation products will be much quicker than mandated, with 1994 as the target year. This is a significant achievement because of the wide-spread use of this product in the U.S. This early transition is partly possible because of an aggressive industry-led research agenda. One important element in this agenda is a joint roofing industry-government study to examine the relative thermal and physical properties, and installation and performance characteristics of polyisocyanurate boardstock foams with alternate blowing agents compared to a foam blown with CFC-11. Participants in this study include the CFC producers through the Society of Plastics Industry, the foam manufacturers through Polyisocyanurate Insulation Manufacturers Association and the government through the U.S. Department of Energy and the EPA. This group first met in a series of two industry-wide workshops on CFC replacement research priorities. This was followed by a joint multifaceted, industry- government project, initiated in 1989. This report focuses on one aspect of the joint project. It is an update on a series of long-term tests with comparisons to lab results at Oak Ridge National Lab (ORNL) in Oak Ridge, Tenn. Other elements of the project have been reported previously. The objective of these particular outdoor tests is to examine the long-term thermal performance of conventional foams with CFC-11 compared to foams with HCFC-123, HCFC-14lb and blends of the latter two. In addition, the tests provide benchmark field performance against which lab thermal aging results can be compared.
Date
0/1992
0/1992
Author(s)
J E Christian; G E Courville; R S Graves
J E Christian; G E Courville; R S Graves
Page(s)
59-68
59-68
Keyword(s)
CFC; thermal conductivity; polyisocyanurate; Montreal Protocol; Montreal Protocol
CFC; thermal conductivity; polyisocyanurate; Montreal Protocol; Montreal Protocol