In Canada, the R-factor was changed in the 1970s to the RSI- factor, using
the m^2·C°/W formula. The values were a lot lower than the imperial
R-factor. And as North Americans like bigger rather than smaller numbers
for just about everything, only the National Building Code refers to RSI.
P
Dear Pierre,
Now you've upset me. I fought for years to get rid of words like tog
in the wool textile business. I saw them in use as jargon words that
weavers and knitters liked to throw around to confuse newly graduated
scientists and engineers in the wool research business. To understand
On Tuesday 26 January 2010 20:46:41 Bill Hooper wrote:
> Clearly this can be converted to m^2·C°·s/J .
>
> Furthermore, factor, s/J, is equal to 1/W so the R value can be simplified
> even further to m^2·C°/W.
And as 1 C° of temperature difference is the same as 1 K, it's a kelvin square
meter p
Dear Bill,
Thanks for the quotation from Halliday, Resnick and Walker. I had
quite forgotten (surprise surprise) that an R was defined as a:
square foot-Fahrenheit degree-hour per British thermal unit (ft^2·F
°·h/Btu)
How remiss of me! But, in my defence, it has been almost 15 years
sin
On Jan 25 , at 10:52 PM, Pierre Abbat wrote:
>
>> R-factor,
>
> You mean the unit of insulation? I don't know how that's defined, but it
> should be simple to label the insulation with the metric equivalent.
It is defined as the reciprocal of the rate of heat flow (in Btu/h) through a
slab
