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Conversion of thermal U value to R value

Conversion of thermal U value to R value
by bersing on 06/11/04 at 00:30:24

I need to onvert a thermal U value (conductance) of 0.24 Kcal/m2k or SI .279 W/m2k to equivilent English system 0.049 BTU/ft.2 hr F

for roof structure insulation.  Can anyone help?


Re: Conversion of thermal U value to R value
by Robert Fogt on 06/16/04 at 08:49:42

According to the University of North Carolina at Chapel Hill, an R value is 1 square foot hour degree Fahrenheit per Btu (ft[sup]2[/sup]hr°F/Btu)

In SI terms that equals 0.17611 square meter kelvins per watt (m[sup]2[/sup]K/W)

You would just multiply R value by 0.17611 to convert to m[sup]2[/sup]K/W


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