R-value conversion

[HollyT]

Trying to convert the following from Europe into an R-value which is comparable to American figures:

R = [(0.004 mq * C°) / W]

Any idea how to go about it?

[Al Lieberman]

Try breaking your formula down into their own units and convert each entity individually via dimensional analysis or you may want to refer to various handbooks.

[Andy]

Hi,
to convert to American is as follows:

From To Divide by
W/ (m) (k) (Btu) (in.)/ (hr) (ft2) (R) 0.1442285

The 2 after ft is squared, must set my keyboard up properly.

Hope this helps Regards. Andy.

[Prof Sporlan]

W/m-K is a thermal conductance unit of measurement.

R values are thermal resistance, and in IP units are typically °F-hr/Btu. Converting from °C/W to °F-hr/Btu:

1 Watt = 3.412 Btu/hr
1C° = 1.8F°

conversion factor: 1.8/3.412 = 0.5275