[Cob] Rocket vs. Rumford for Patio Heating

[Bryan]

Rumford still is burning very dirty and polluting when compared to LP or
rocket stove.  Take the creativity on this list and find solar heat or other
sources of clean energy!

On 10/7/07, Ocean Liff-Anderson <ocean at woodfiredeatery.com> wrote:
>
> Been reading this thread and want to clarify an important point:
>
> Outdoor heating requires "radiant" heat, especially since you are
> cooled by any breeze which might blow through or around your patio.
> This is why the free standing propane heaters work so well - they
> provide 100% radiant heat.  On the other hand, "conductive" heat is
> ideal for storing heat in thermal mass which is released gradually,
> best for heating buildings or enclosed spaces.
>
> Rocket stoves are good conductive heaters and but not very good for
> outdoor/patio heating - ideal for storing heat in thermal mass
> through the cob-encased flue bench in Ianto's design (which is absent
> in the African cook-stove Rockets previously discussed in the
> coblist).  Ianto's Rocket drum radiants heat primarily off the top,
> not as much from the sides of drum.  So in an outdoor patio, you will
> be standing around your rocket and warming your hands over the top
> all the while shivering due to your chilly lower quarters.  The
> Rocket's heated bench does help a little, but any breeze quickly
> negates the effects of a warm butt.
>
> On the other hand, the Rumford hearth is primarily a radiant heat
> source, where heat is projected (for lack of a better word)
> horizontally out to the people sitting or standing around it, warming
> hands, legs, torsos or butts - depending on which side of you faces
> the hearth.  At Ahimsa Sanctuary, we hired Ianto to build us a
> Rumford in our cob kiva.  We had it fired up while plastering, and
> the Rumford put out so much heat that it melted a 5-gallon bucket 6
> feet away!
>
> Here are pics of our Rumford being built and fired up.
>
> http://www.peacemaking.org/cobpics/rumford1.jpg
> http://www.peacemaking.org/cobpics/rumford2.jpg
> http://www.peacemaking.org/cobpics/rumford3.jpg
> http://www.peacemaking.org/cobpics/rumford4.jpg
> http://www.peacemaking.org/cobpics/rumford5.jpg
> http://www.peacemaking.org/cobpics/rumford6.jpg
> http://www.peacemaking.org/cobpics/rumford7.jpg
>
> Rumford hearths have very specific design requirements so that the
> flue and draft work properly.   I don't know of any published cob
> plans, but I did Google into a site out of Port Townsend, WA which
> sells a masonry (brick & mortar) version:  http://www.rumford.com
> This is pretty spendy, as most conventional masonry construction is,
> and not really what we are looking for in the cob building movement.
>
> So if you'd like to integrate a Rumford into a cob wall or building,
> I would suggest contacting Cob Cottage Company for info.  Cob Cottage
> has built several Rumfords into courtyard walls with adjacent cob
> bench seating, the most prominent one on the cover of the Hand
> Sculpted House.
>
> Good luck!
> Ocean Liff-Anderson
> Steward, Ahimsa Sanctuary
> http://www.peacemaking.org
> Proprietor, Intaba's Wildfire Restaurant
> http://www.woodfiredeatery.com
>
>
> On Oct 6, 2007, at 6:08 PM, michael montagne wrote:
>
> > So I look at pictures and diagrams of rocket stoves and I read how
> > they work
> > and where to clean what when but a question still remains.  Are
> > these 55
> > gallon steel drum heat exchanger containers just upside down
> > barrels?  In
> > other words, is it necessary to open the top for maintenance?  If
> > not, why
> > don't more people just substitute cob for the steel barrel?  I
> > guess that's
> > really more than one question.  Also, where to source the smaller
> > barrel for
> > the feed tube?  I'm in Portland, Oregon.  My stove will be outside,
> > heating
> > a small covered area of my deck to allow use during the cooler months.
> >
> > -mjm
> > _______________________________________________
> > Coblist mailing list
> > Coblist at deatech.com
> > http://www.deatech.com/mailman/listinfo/coblist
>
>
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