Moving heat from blower into ductwork, how I did it-

Moving heat from blower into ductwork, how I did it-

PostBy: agcowvet On: Sun Nov 18, 2012 10:47 am

No code compliance considered, I don't know nor care if it is or isn't in compliance. (Clearances are OK though.) This was a temporary install to see how well it worked. You'd need backflow dampers if a permanent install for sure. When the stove is going pretty hot (surface temp around 500) the ducts close to the stove are too hot to hold your hand on for long, but at the plenum you can keep your hand on quite a long time.

Obviously a little 200-cfm blower won't have the guts to move large volumes of air, especially after running through a duct system--but I get 'feelable' (how's that for a scientific term!) flow at most registers, and the 1st and 2nd floors are a couple degrees warmer--basement, where the stove lives, is cooler. I don't think it's worth it though, the house 'feels' colder even though the thermometer says it's warmer...likely as a result of cooler floors. If this was a smaller, tighter house then things would probably be different.

Return air (and whatever radiant convection) comes from the basement stairwell--door is removed.

4x12 90 degree register boots feed 6" duct, through adjustable elbow, into adjustable takeoffs cut into side of furnace supply (hot side) plenum. One had two adjustable elbows to provide an offset.

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Register boots
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agcowvet
 
Hot Air Coal Stoker Furnace: efm AF150
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Newmac NL-2 (oil)

Re: Moving heat from blower into ductwork, how I did it-

PostBy: Dallas On: Sun Nov 18, 2012 12:13 pm

You haven't mentioned and I can't tell, if there is an "air source" at the stove. ? It looks like you should enclose part of the stove with a plenum, so that air can circulate from the stove room around the stove and into the heating system. If the pick-ups, at the stove are just sitting on top, you won't have air flow into the heating system plenum.
Dallas
 
Hand Fed Coal Stove: Modified Russo C-35
Other Heating: Oil Hot Air
Stove/Furnace Make: Russo
Stove/Furnace Model: Modified C-35

Re: Moving heat from blower into ductwork, how I did it-

PostBy: Dallas On: Sun Nov 18, 2012 12:31 pm

I guess, the answer to my question was answered with the title. Do have a return path, from the other end?
Dallas
 
Hand Fed Coal Stove: Modified Russo C-35
Other Heating: Oil Hot Air
Stove/Furnace Make: Russo
Stove/Furnace Model: Modified C-35

Visit Hitzer Stoves

Re: Moving heat from blower into ductwork, how I did it-

PostBy: agcowvet On: Sun Nov 18, 2012 12:32 pm

Dallas,

Yes, there is. Blower output underneath that top 'lip'. The blower is on the back of the stove, blows air over the back and under the top, comes out there.

Or if you were asking of return air? That comes down the cellar stairs which end about 6' away from the left side of the stove. Tried running it with the blower/filter cover removed at the oil furnace, so as to use return air from current duct system, but it didn't seem to make any difference.

I have removed the ductwork from the stove now and will go back to having warmer floors on the 1st floor, and more warm air coming up the basement stairs. The house feels warmer that way even if the thermometer says differently. An experiment that didn't quite turn out.

On edit: too slow at typing but I see I answered your question anyhow.
agcowvet
 
Hot Air Coal Stoker Furnace: efm AF150
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Newmac NL-2 (oil)

Re: Moving heat from blower into ductwork, how I did it-

PostBy: Dallas On: Sun Nov 18, 2012 12:47 pm

You might want to look at "my index" below. My complete circulation system, which works pretty good, is documented. The final step, being to add a return duct and fan.

I had thought about using the furnace duct work and blowers, but felt, much heat would be lost, when passing through the furnace. (heat exchanger working backwards to remove the heat)
Dallas
 
Hand Fed Coal Stove: Modified Russo C-35
Other Heating: Oil Hot Air
Stove/Furnace Make: Russo
Stove/Furnace Model: Modified C-35

Visit Hitzer Stoves