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Abstract
The standard conditions and equipment no longer adequately describe the insulation value of the producs in the market place because of the elimination of CFCs from rigid polyurethane foam. As CFCs were replaced with more environmentally friendly HCFCs, HFC, carbon dioxide and hydro- carbons for foam expansion, the thermal efficiency of the insulation products produced with these blowing agents became confused and complex. This paper describes the k factor of rigid polyurethane foams over a mean temperature range from 17F to 75F. Blowing agents which are liquid at room temperature such as HCFC 141b, HFC 245fa, HFC 265mfc,, n-pentane, c-pentane and iso-pentane were evaluated. Gaseous blowing agents such as HCFC 22 and HFC 134a were also evaluated, as well as blends ofliquid and gaseous blowing agents.
The standard conditions and equipment no longer adequately describe the insulation value of the producs in the market place because of the elimination of CFCs from rigid polyurethane foam. As CFCs were replaced with more environmentally friendly HCFCs, HFC, carbon dioxide and hydro- carbons for foam expansion, the thermal efficiency of the insulation products produced with these blowing agents became confused and complex. This paper describes the k factor of rigid polyurethane foams over a mean temperature range from 17F to 75F. Blowing agents which are liquid at room temperature such as HCFC 141b, HFC 245fa, HFC 265mfc,, n-pentane, c-pentane and iso-pentane were evaluated. Gaseous blowing agents such as HCFC 22 and HFC 134a were also evaluated, as well as blends ofliquid and gaseous blowing agents.
Date
10/1996
10/1996
Author(s)
Stanley Moore; Donald Ference
Stanley Moore; Donald Ference
Page(s)
328-333
328-333
Keyword(s)
polyurethane; optimiztion; energy efficiency; CFC; HCFC; k factor; rigid polyurethane
polyurethane; optimiztion; energy efficiency; CFC; HCFC; k factor; rigid polyurethane