Supplemental heat how to????

Mike T., Swampeast MO

Compute the same as if it were a floor--up/down/horizontal/vertical doesn't matter with radiant panel heating. Even with semi-gloss paint, the emissivity of walls is likely to be as good as (if not higher) than most common flooring materials.

Do your best to have the radiant walls <I>only</I> on internal walls <I>with back insulation</I>. If you must use on external walls use EXCEPTIONAL back insulation--perferrably with a <I>constantly maintained</I> air gap between the wall and the insulation and a radiant barrier--think carefully fitted rigid, foil faced...

Frankly I would increase the heated wall area by about 20% to account for pictures, etc.

Craig R Bergman

Here's the deal...

I am bidding a large Geo/Radiant home. The Family room is 590 sqft. with 20 ft. ceilings and a LOT of glass. With 1/2" Pex on 6" centers the room still requires 5,302 Btu/Hr supplemental heat. I will use Uponor's extruded plates behind the drywall, a first for me. How do I figure out how much pipe I need behind the drywall to get the needed Btu's??? Because it's Geo my water temps will be limited to about 118*.

Thanks for the help.

Bergy

hr

Easily

count on 25 btu per square foot from a ceiling or wall with @115 supply. I'd say plates 8" on center, possibly just 4 feet up would get you the boost?

I'll bet the Radiant Engineering folks have some design data. www.radiantengineering.com.

Also the Wirsbo design manual has formulas.

Try the Feb. o5 PM mag issue. I think Siggy did a write up on radiant options.

hot rod

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Andrew Hagen

Thermofin

Here's the Thermofin output chart for 8"OC. It assumes 3/4" of plywood subfloor (R-0.75). It should give you an idea.

I dont think I would ever count on more than 50 btu/sf with a radiant surface.

Ericjeeper

Suggest lower U value-Higher R valu windows

With triple pane glass and double lo e. Can bring the window wall into perspective. Can get close to an R 7
My motto is Tighten the envelope