Coal Insert, Convected Heat Inside Fireplace

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gardener
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Location: southwest Ohio

Post by gardener » Tue. Dec. 30, 2014 2:02 pm

I have a large fireplace, with a square 12x12 clay lined flue, which I am shopping for a coal insert to install. I have been pondering what happens to the convected heat inside the fireplace (behind the shroud). My current thought is to install a stainless steel liner the full length of the flue. There does not appear to be a requirement that a liner be insulated for coal exhaust, but I would likely wrap the liner anyway.

Convected heat would rise in the flue and be cooled by the clay tiles, drop then reheat and repeat. Options seem to be that I could plug the base of the flue (around the liner) with mineral wool; OR insulate further by pouring in vermiculite / Perlite insulation between the liner and the tiles. These are open ended ponderings (please comment), but I do have a specific question which is...

Inserts have a pseudo outer shell that fans blow room air through to heat the room with. Why not go a step further and insulate (encase) the insert behind the shroud with mineral wool?
... would this cause more of the heat to be transferred to the room?

 
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davidmcbeth3
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Coal Size/Type: nut/pea/anthra

Post by davidmcbeth3 » Tue. Dec. 30, 2014 5:49 pm

One should insulate between the shroud and the chimney bricks .. mine has std insulation to create a "seal" .. for the pipe from the stove to the top of the chimney, mine is insulated.


 
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McGiever
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Joined: Sun. May. 02, 2010 11:26 pm
Location: Junction of PA-OH-WV
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Hand Fed Coal Boiler: BUCKET A DAY water heater
Hand Fed Coal Stove: Warm Morning 414A
Coal Size/Type: PEA,NUT,STOVE /ANTHRACITE
Other Heating: Ground Source Heat Pump and some Solar

Post by McGiever » Tue. Dec. 30, 2014 6:28 pm

Here is a worthy Quote I found while SEARCHING...
Photog200 wrote:
franco b wrote:A block off plate is nice but all it needs is to stuff fiberglass insulation around the smoke pipe to seal off the damper area. Much easier.
Another good insulation for this install would be rock wool. It is made from slag and is fire proof to 2000°. You can get this at Home Depot and Lowe's.
Randy

 
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Formulabruce
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Location: in the "Shire" ( New Hamp -shire)
Hand Fed Coal Stove: Harmon Mark 1 Goldenfire
Coal Size/Type: BLASHAK Nut and Stove size
Other Heating: Blower from a gas furnace if I need to move air, no heat

Post by Formulabruce » Tue. Dec. 30, 2014 11:32 pm

When you put in your 6 inch flue pipe, it will be sealed around the top of the chimney before the cap. The heat doesnt escape much. It helps keep the chimney warm though, aiding in your drafting at a slower burn. Most people I know use a rock wool on bottom and sealed at the cap..

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