hydronic heat = heat rises?

[stealman]

I am planning a new shop build. It will be 44' long X 32' wide. 12' plate hight with 6" and 12" siser trusses. 3" and 12" on the inside. I am going with hydronic heat in the slab and a supper insulated shell.

My concern is with the ceiling hight and having trouble keeping it comfortable at ground level. I know that people say that the heat from the floor stays lower. Is this really the case? It seems as though the radiant heat will heat the objects, but then this heats the air and that heat will go to the ceiling. Will it be hard to keep this building comfortable?

I want the tall ceiling to create a loft at the back as well as having tall doors to get a r.v. inside if I want to.

 

[dirttracker18]

I am 15' at the ceiling peak and warmth down low is not an issue. You could put up a couple of fans if you are concerned.

In fact when I need to get up on my pallet rack near the ceiling I find the temp fairly consistent.

 

[Fastback]

Heat does not rise, hot air rises. If your slab is insulated via expansion material from the walls it will not convect or wast heat that's trying to climb the walls.

Radiant heat will radiate and convect.

 

[koditten]

My peak at 15' is 2-3* cooler than the temp of objects at knee level. I run my thermostat at 48*. The floor is anywere from 65-70*. I'm sure it changes more, but I don't feel the need to shoot the floor temp every hour.

I too, was wondering if the heat would rise. I actually installed a cieling fan. That was a big waste. It only screwed witht he therostat. Haven't used it in 2 years during the heating season. The heat stays low, like it is sapposed to.

Hydronic heat is the way to go for me. I'm a welder, so I don't need warm temps. I am already wearing extra clothes when I weld. I love my warm feet. Can't remember the last time I wore thermal socks. Thermal sock used to be the norm.

KO

 

[jeff5295]

Mine is close to 20' to the peak. I've put digital thermometers at various heights and found it to a couple degrees cooler at the top vs down low. You don't need or want to use a ceiling fan with radiant floor heat. The beauty of a radiant floor is that it keeps the heat down low. I keep mine about 55 or so and it's comfortable to work in a sweatshirt.

Your 12' ceiling won't be an issue with keeping heat down where you need it.