Open/Closed Loop Boiler Help?

[bowhuntr311]

Hey all,

I came here hoping for some advice to see what route I should pursue for heating my detached 40x40x10 detached shop.
Outdoor woodboiler is going to be my source of heat and I currently have floor loops of pex for heating the floor that I want to hook up to a pressurized closed system. I was hoping to use my floor heat as a constant heat at say 45 degrees and some kind of coil/fan system for an on-demand air heater.
{Im coming home from work @ 5:30 and decide I want to work in my shop that evening. Floor heat could take several hours to warm it up to 60 and i would be done with my project by then; Im hoping the coil could be 20 min and be up around 60}

Im was hoping to run the open side above the floor heat system to a hanging coil and the return side back down and out to stove. The coil would be ABOVE the stove in elevation by a few feet with out a doubt. Several people said it'll never work and the pump wont be able to push the water up above the stove and it'll vapor lock and through the coil and back to the stove and several had said it'll work with a good pump and an air trap release (air bleeder) but cant offer any specs to a pump I would need?
One person suggested running another loop off the floor manifold through the coil. My closed system water temp at 110 doesnt seem like it be very hot air coming off the coil?

Any advice out there?

 

[Radix2]

Your post is kind of confusing as to what the actual configuration is. Typically the loop to the wood stove would be open for safety ( hard to control a wood fire in case of overtemp) then a heat exchanger would be used to pull off the low temp radiant floor loop and isolate it from the open loop to the stove ( for corrosion protection to keep oxygen out)... is this your basic configuration?

And is the question - can you put a air coil on the open loop to the stove? Is the air coil going to be in series with the heat exchanger or a separate loop?

Anyway, the main concern seems to be the height differences- it should not matter, the pipes/pump should be full of water all the time, slight differences of a few feet will not be a problem. The situation is like a glass upside down filled with water, or a siphon filled between two equal height points, the coil will stay full and the pump will not be effected.

You will definately want the air coil to be hotter than the floor loops. Typically 180F for rated output.

The pump will be sized for your btus.

 

[bowhuntr311]

Sorry for the confusing post.

Yes thats the basic configuration. Open/unpressurized loop to the stove with a heat plate exchanger and a closed pressurized system in the floor.

Wondering how or if it'll be a concern for the air coil on the open loop.