Sanity Check - Unit Conversion
Sanity Check - Unit Conversion
(OP)
Hey people,
I'm working with a problem that may involve radiation effect and I need to apply the Stephan-Boltzmann constant in english units (BTU/s/in^2/oF^4). the constant is generally know as 5.67E-8 W/m^2/K^4.
So I just convert by (1BTU/s = 1054.1175W), (1m^2 = 1550.0031in^2), and (1 deltaK^4 = 10.4976 deltaF^4). Which gives me 3.306E-15 BTU/s/in^2/oF^4.
While browsing online I find a reference for S-B = 1.714E-9 BTU/hr/ft^2/oF^4 which converts to 1.984 BTU/s/in^2/oF^4, not even in the same ballpark as my conversion.
Could you please check my math and possible snaity on this issue. Hopefully I just found a shotty website. Thanks all
I'm working with a problem that may involve radiation effect and I need to apply the Stephan-Boltzmann constant in english units (BTU/s/in^2/oF^4). the constant is generally know as 5.67E-8 W/m^2/K^4.
So I just convert by (1BTU/s = 1054.1175W), (1m^2 = 1550.0031in^2), and (1 deltaK^4 = 10.4976 deltaF^4). Which gives me 3.306E-15 BTU/s/in^2/oF^4.
While browsing online I find a reference for S-B = 1.714E-9 BTU/hr/ft^2/oF^4 which converts to 1.984 BTU/s/in^2/oF^4, not even in the same ballpark as my conversion.
Could you please check my math and possible snaity on this issue. Hopefully I just found a shotty website. Thanks all





RE: Sanity Check - Unit Conversion
RE: Sanity Check - Unit Conversion
When I put in 1 W/(m^2*K^4) I get 5.825E-8 BTU/(s*in^2*R^4).
This looks like a good example of the WWW being a Cavet Emptor kind of place. I'm always a little leary of using a number from the internet that I can't confirm independently. I had a mistake on my web page once and when I started searching for the authoritative answer I found 10 links back to my page with the wrong number on it.
David
RE: Sanity Check - Unit Conversion
Thanks for double checking me. Wierd thing is that I found another site with the same english units results that don't match mine: 0.1714E-8 BTU/hr/ft^2/oF^4.
I can feel confident with my own conversion against one rogue site, but when 2 sites don't match my work I start to wonder.
RE: Sanity Check - Unit Conversion
RE: Sanity Check - Unit Conversion
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Sanity Check - Unit Conversion
...and, of course, 0.1714E-8 = 1.714E-9