Well I would look at the following calulator for ideas.
http://www.engineersedge.com/heat_tr...iner-calcs.htm
I need help on figuring out how to find the surface temperature of a given material. Say for example An R-20 wall. With outside temp at -20 and sustaining an indoor temp at 70.
Correct me if im wrong but this is my best guess at it:
Take .68(Inside air film) divide by total R-Value
Take this percentage and multiply by Temperature difference (.68/20) * 90
Subract above number from 70 ((70-(.68/20))
Would this give you a surface temperature?
Last edited by Kelly_Bramble; 12-01-2012 at 06:41 PM.
Well I would look at the following calulator for ideas.
http://www.engineersedge.com/heat_tr...iner-calcs.htm
Also, see the attached document - somewhere around page 4.
Arch-Heat-Flow-Basics-reduced.pdf
heat-transfer-wall.gif
Last edited by Kelly_Bramble; 12-02-2012 at 08:36 AM.
Probably close enough.
If you need greater accuracy, your .68 from natural convection may have to be adjusted for the actual indoor conditions.
Thanks for all of your guys advice, im using it for HVAC purposes and trying to explain to a customer why she feels cold next to her window in the middle of winter.