Max water temp to concrete?

8-ball

thanks for the advice...I'll probably reduce my design water temp to where I'm more comforatable and add some more supplemental heat.

8-ball

Max water temp to concrete?

Im working on a radiant job that is going to be an 1-1/2" concrete overpour with carpet and pad on top...R-1.5 or so.
I would like to get the average surface temp to 85 degrees. By my calcs to do so I need an average water temp of 145 degrees. I'm worried about sending that temp to the concrete...could this cause a problem or am I worried for no reason?

hr

140

seems to stick in my mind. I think that is true for gyp type products also. you might quiz at one of the online concrete sites.

hot rod

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Weezbo

start slow run long *~/:)

usually i start the slab rolling at 58 and bring it along slow. However, i also have GC's that want to mud tape and texture tomorrow with 33 below zero outside today. what to do? get the gypcrete or cement or general to fully understand your concernes then shoot heat to it at 100 for a day ,tell them that it takes a while to bring it up to temp,do to the thermal mass of the building being 120 tons or better,then dial it up to like 120,and let it roll a day,,i hate shooting higher heat to it , like you i have asked this question even though i have beeen doing this for decades. it is 90 outside in the summer the sidewalk is 102 ,the gc says you need to pump heat into the slab because we want to get the moisture out of it for the carpet layers ,it isnt designed that way i insist,drop everything run over there crank heat to it , i have seen what shooting 180 to a big heavy slab can do,it aint pretty.

Gordy

Concrete temps

I think it needs to be looked at from the stand point of linear expansion. For every 10* you raise or lower the temperature of concrete from a 50* baseline state. It will expand or contract 1/8" per 100'. Does not sound like much until you are talking miles of pavement or a long bridge deck.

The bigger stress factor would be the difference in floor temperature across the plane from tube to tube. Wide spacing equals less uniform temps. This would create more stress on the concrete than the heat itself. That being said a closer tube spacing will create a more even floor temperature PLUS allow you to have LOWER water temps. to heat the space. Which equals less ENERGY used.

MPO Gordy