Re: [rocketmass] Rocket Mass Greenhouse?
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jerry diamond
Nov 15, 2014, 2:54:51 AM11/15/14
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Re: [rocketmass] Rocket Mass Greenhouse?
Water
is five times better than anything else at storing and releasing heat.
55 gallon drums, or horse tank, etc would work.
If you use a steel tank,
just encase the exhaust pipe in cob, etc, to prevent dielectric
corrosion of the metals, plus to reduce the heat a bit.
They
would also be a good size for a Hot Tub:o) I would question using the
black poly,
but with three or so inches of cob between, they should
work.
BTW, you can also have the pipe in the ground with water barrels over it -a Trench Rocket Stove. That will save working space in the greenhouse.
As
to coiling pipe around the heater core -not a good idea. Not directly
touching, at least.
Two reasons; One, Dielectric corrosion -that is how
batteries work; the further at either end of the Galvanic Scale, the
more electricity produced -the more rust, ie corrosion -of copper,
steel, or SS even.
SS will corrode slower, but the first thing in
knives, etc they tell you is: "Stainless Ain't!" Given electrical
"agitation" it will leak.
The
other thing is that it is massive heat overkill (No Pun In ten did)
-"The rocket stove’s internal temperatures can get in excess of 2000
degrees (in a well insulated combustion chamber) and it’s exhaust, which
runs through a mass (cob, rocks, etc.) that is absorbing and slowly
releasing the heat, is well under 200 degrees!
That’s an insane amount
of energy energy being stored in the mass and radiated out of the bell
housing." -Link below.
That
is also an INSANE amount
of energy energy to heat water with. Water boils at 212 F, so above
that, you are creating steam.
A steam engine blew in Ohio at a horse
power days and killed 11 people. Like Washington said of fire & government;
They are -"Good servants, but terrible masters."
Also...Keep The Number One Rule of Engineering in mind when venturing into inventive and construction oriented frontiers:
"Overstressed structures have a way of relieving themselves...
But wouldn't you really rather do it yourself?"
You would reach explosive temps at
worst, possibly very rapidly, depending on how the system is built,
and
at worst make enough steam to run a turbine. Neither are your goals.
I
think someone built one, made lots of steam, but then had to chip all
the cob away and start over.
I think they used about 3 or 4 inches was what I remember, but you might
look for that example. If I can find it, I will link it.
I read an example of even Solar heat almost causing catastrophic failure in a system;
just
black pipe in the top of a solarium when turned on, made the temp
gauge rise so fast
they barely had time to run down to the first floor
to shut it off and drain the pipes, before they had a massive meltdown.
You
want hot water, I dunno, not hot enough to melt your barrels, but below
200 for sure.
Pressure relief valves from old water heaters,
circulating pump like Mike said, etc.
Vertical feed tubes can take long pieces of wood -2 by 4, saplings, etc and burn about a foot per hour +/-.
Another
option, I ran across in studying kilns -they use one design called a
Bourry Box -basically giant rocket stoves!!! They are, I think, BLDD
They feed hoppers with
From: "rustah...@yahoo.com [rocketmass]" <rocke...@yahoogroups.com>
To: rocke...@yahoogroups.com
Sent: Friday, November 14, 2014 4:20 PM
Subject: [rocketmass] Rocket Mass Greenhouse?
Very slow group here.
I really wish it had gone over better.
Rocket stoves really are great.
I need to build a shed out back and I want to put a rocket mass heater in it.
I
am thinking about an enclosed porch where the feed part is and the fire
will be like under the wall into the building. The enclosed porch will
be on the South side of the building and it will be a dry place to store
bundles of firewood.
That
way the air that is feeding the fire will not be coming from inside the
building. Just a short distance inside the wall will be the fire loop
then the exhaust into the bench that will be on the West side then on
the North wall before exiting out through the East wall.
This
will just be a testing mass heater. The idea is to head back there on a
cold winter day and see what the mass heater will do. If I keep a fire
going for 24 hours or until it is warm in there then just let the fire
die down to see how long the warmth lasts. Ultimately what I want is to
build a greenhouse with one in it.
If I could just feed it several times a day and the mass would carry it through the night I would be so happy.
Also I must ask if anyone thinks water can be the mass.
Originally
I was planning to use an old cast iron wood stove I have that has a
water jacket around it and two threaded holes to plumb it up with 3/4"
pipe. I was going to place 12 plastic 55 gallon drums around the
greenhouse with the grow beds on top of them. Insulation wrapped around
all of the barrels would make almost all of the heat go up through the
grow beds. I was going to push water through the stove then through all
of the barrels. The cast iron stove would have been radiating heat into
the whole greenhouse.
I
know the rocket stove will burn a lot cleaner and get more heat out of
the wood. If I can wrap enough copper line around it do any of you think
the water barrels would be okay to use?
I
have insulated double pane sliding glass door panels to use for the
glass parts of the greenhouse. If I had row covers on the grow beds just
think about all of the heat that would be stored in those barrels
radiating up through the grow beds then is trapped under the row covers.
Alan in Michigan
A Michigan Redneck
__._,_.___
Posted by: rustah...@yahoo.com
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