Re: [Phys-l] Insulation R-value

[Bernard Cleyet <bernardcleyet@redshift.com>]

Here's some values w/ the units as you saw:

http://hyperphysics.phy-astr.gsu.edu/hbase/tables/rvalue.html

Their link shows how it may determined (schematic only).

http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/heatloss.html#c1


bc, googler.


Dwight K. Souder wrote:

> Greetings everyone.  I have a student who recently heard of homes being
> built with Styrofoam walls and another home with miniature wheat/straw
> bails.  He's wanting to do a project to measure their R-value (Resistance to
> heat flow) of different materials.  He's done some research on it, but
> hasn't come up with how the R-value is determined.  I think I once saw that
> the R = ((delta)Fahrenheit x ft^2 x hours)/Btu...is this correct?  The
> formula doesn't look right.  Has anyone done a lab on this or knows how it
> is determined?
>
> Thanks,
> Dwight
> Crestview HS
> Ashland, OH
>
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