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RMH in a partly underground round house made of earth bags

 
pollinator
Posts: 284
Location: Nevada
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Maybe a little complicated.  If I have as earthbag house that is mostly underground - roof is covered with soil also....inside, before covering the earth bags...would it be efficient to make a rmh on the floor, right up against the earth bags....with a long flu (if that is what the exhaust tube is called) that is placed at a slight incline?  The earth bags would probably be covered with some kind of mass to protect the bags...the rmh would be 6" wide...and maybe put papercrete on the walls above the rmh against the earth bags.
 
pollinator
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Hello Tom,

Of course you can put in a rocket mass heater in a earthbag home.

Here's somethings you might care about:
-insulate the bottom of the rocket stove from the floor (some do this by using two layers of three hole bricks underneath the firebrick...not the best insulation but eco-friendly and passes air from the room through the bottom);
-insulate the mass around the flue from any outside wall (doing this in an eco friendly way takes some creativity like papercrete);
-papercrete on the wall around the barrel isn't such a great idea unless you've tested your paper create up to 1000F;
-no to the incline unless you decide to go with a stratification chamber and an exit flue a half inch from the barrel.

those are my thoughts!

good luck!
 
gardener
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Hi Tom,    As Orin stated a RMH would be a great idea. Insulating the floor would also be a great thing to do as the Earth will constantly be sucking up heat that you produce and not give much of it back. A few simple ways (under the core is the most critical) to have either some air flow using bricks turned on their sides and covered with a cement backer board or making a perlite/clay foundation.  

The horizontal exhaust pipe can be put on a slight incline towards the vertical stack but is not absolutely necessary. You could also create a bell or stratification chamber which would eliminate all the horizontal piping. It can be pretty much be any shape you wish and tends to put much less drag on the exhaust. Let us know which one you go with as each one has their fine print to work with.

Not sure the temperature rating of papercrete and how close it can be to the combustion chamber but would probably think it would be fine in the heat extraction area.
 
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