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Is exterior feed possible for RMH?  RSS feed

 
Posts: 24
Location: Chattaroy, north of Spokane, WA
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We've yet to start building my husband's trappers shed, so have plenty of time to plan the design. Will be approx. 12'x16' plus a 4'x16' covered porch area.

Here's a rough drawing of what I'm hoping to do. Husband has asthma, so I'd like to eliminate chances of smoke inside. Is it possible to create a rocket mass heater with EXTERIOR FEED?

Not a rocket scientist, but guessing this will affect the ratio of intake to output.
Cabin-with-RMH-exterior-feed.jpg
[Thumbnail for Cabin-with-RMH-exterior-feed.jpg]
Small cabin with RMH exterior feed.
 
Posts: 197
Location: S.E. Michigan - Zone 6a
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I am wondering this same thing, but my application would be a sauna.
 
Vicky Barton
Posts: 24
Location: Chattaroy, north of Spokane, WA
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Jerry Ward.... I'm also interested in a RMH Sauna project for our place.
 
Posts: 3366
Location: Kansas Zone 6a
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You have a few issues to work out--

There is a limit to the horizontal feed and you don't really have a lot of room between the barrel and the feed to put much of a wall and it has to be completely non-combustible.

You have put the barrel right in the corner of the building so you are losing a lot of the heat radiating directly onto an exterior wall.

You have to make sure the wind doesn't blow across the feedtube and create a vacuum to backdraft (like blowing across the top of a bottle).


Not saying it can't be done, just saying it has issues to work through.
 
Posts: 243
Location: near Houston, TX; zone 8b
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The issue of why this doesn't work well is addressed in the early part of this thread: "RMH, fresh air intake, why suck out warm air from inside?" by contributor Adam StJohn.


 
pollinator
Posts: 4154
Location: Northern New York Zone4-5 the OUTER 'RONDACs percip 36''
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Vicky Barton : While my fast answer would be- ''No, why don't you find someone who lives with a rocket mass heater RMH, and see smell for yourself how smoky
their house is or isn't there are about 6 other Forum Threads where you can ask for an invite to visit !

Having said that, I Am sending you to - 'rocket mass heater - Finally completed and it works! - (rocket stoves forum at permies) watch for the link for pictures! -
Notice that this system has a horizontal wood feed system, since this was 1st made, some members have made designs similar to this, that rival the efficiencies of the Vertical Feed
J-Tube style RMHs that are the standard that other stoves get measured against !

For the Good of the craft! Think like Fire, flow like a Gas, Don't be the Marshmallow ! As always, your questions / comments are solicited and are welcome PYRO - Logically, BIG AL!
 
Vicky Barton
Posts: 24
Location: Chattaroy, north of Spokane, WA
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Sure appreciating all the info and links. Am jotting notes and hope to get something solid to start this project in spring 2014.
 
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