[Cob] RE: two chamber earth oven

[Peter Ellis]

The sort of thing you are imagining is more similar to what is being done 
with many masonry heaters these days.  There will be a fire box of some 
size, then a series of heat exchange channels leading eventually to the 
chimney.  It's fairly common for an oven to be placed somewhere near the 
fire box but completely cut off from the fire and its exhaust gases.

In my case, what I'm planning for right now will look more like a 
conventional cob oven, with a tail dropping off (the chimney) leading down 
to a fairly small fire chamber (the rocket stove).  The chimney will vent 
right into the oven, so the hot gases will be going through there directly.

Rocket stoves are very small (typically), high efficiency and very low tech. 
  There are instructions for making them out of three or four tin cans on 
the internet.  As I understand them, the essential elements are a feed tube 
that provides an avenue for putting fuel into the fire chamber and also 
provides an air path that runs below the fuel, and the "rocket elbow" - the 
chamber achieved where the fuel tube meets the chimney and the fuel sits in 
the flow of air coming in from below and rising up through the chimney.

I see no reason I can't make one of these arrangements using cob.


Peter Ellis

>From: "Mary Lou McFarland" <louiethefifth at hotmail.com>
>To: Coblist at deatech.com
>Subject: [Cob] RE: two chamber earth oven
>Date: Wed, 27 Jul 2005 15:48:48 -0500
>
>I was wondering if this design would be similiar to a baking oven that 
>would be built in next to the fireplace, like they did in colonial times.  
>I think that I've seen a modified version of that basic design in a bread 
>oven, except the small oven chamber was stacked over the firebox instead of 
>next to it, as in the colonial fireplace.  Will the chimney go completely 
>down to the firebox or just to  the airways that wrap around the  oven?  
>I'm not familiar with rocket stoves so I might be envisoning this all 
>wrong.
>
>
>
>_______________________________________________
>Coblist mailing list
>Coblist at deatech.com
>http://www.deatech.com/mailman/listinfo/coblist