http://richsoil.com/stoves
http://permies.com
Greenhouse
construction with a rocket mas heater, including an excellent
demonstration of the rocket mass heater sideways burn. The greenhouse
construction class is taught by Ernie and Erica Wisner, featuring the
rocket mass heater techniques of Ianto Evans (of cob cottage company
fame). I cannot think of a better approach to greenhouse heating.
This is the first phase of building this greenhouse. The focus is on the steps of building the rocket mass heater.
This video has an excellent demonstration of the sideways burn - or fire burning sideways.Since
this will be an oehler style solar greenhouse, then it probably won't
need much heat. But it will be a bonus. And the heated air could also
be piped into the house.
A rockey mass heater is typically 10 times more efficient than a regular wood stove. And 20 times cleaner. A mike oehler style greenhouse construction is probably the most efficient greenhouse known.
A
rocket stove mass heater or
rocket mass heater, is an innovative and efficient space heating system developed from the
rocket stove, a type of hyper-efficient wood-burning stove, named in the 1970s, but dating back millennia in concept, and the
masonry heater.
Wood is gravity fed into a "J-shaped" combustion chamber, from where
the hot gases enter a heavily insulated metal or fire-brick vertical
secondary combustion chamber, the exhaust from which then passes along
horizontal metal
ducting embedded within a massive
cob thermal store.
The thermal store is large enough to retain heat for many hours and
typically forms part of the structure of the building.
They have proved
to be popular with
natural buildings and within
permaculture designs; they are normally self-built and are not yet recognized by all
building codes which regulate the design and construction of heating systems within buildings.
An internal vertical insulated
chimney,
the combustion chamber, ensures an efficient high-temperature burn and
creates enough draft to push exhaust gases through the rest of the
system.
Flue gases are cooled to a relatively low temperature within the thermal store, approximately 50°C, and steam within these gases
condenses into liquid releasing the associated
latent heat of evaporation, which further increases the efficiency in the manner of a
condensing (gas) boiler.
[1]
History
The key principles of the
rocket (cooking) stove were described in 1982.
[2]
Ianto Evans of the Cob Cottage Company then described how the same
combustion principles could be used to heat a building in his 2006 book,
'Rocket Mass Heaters' based on research and experience in many
countries over a 30 year period.
[3]
Efficiency
From "Rocket Mass Heaters: Superefficient Woodstoves YOU can build" (Ianto Evans and Leslie Jackson, Cob Cottage Company,
ISBN 0-9663738-3-9)
- p. 12: "In my own cottage I burn only about two-thirds of a cord
of (fir and alder) firewood a year, while my neighbors average 3-5
cords. You can usually tell when any of the neighbors are around by the
cloud of smoke coming out of their chimneys. By contrast, we burn so
clean that visitors coming into my house want to know how come it's so
snug without the stove burning. Imagine their surprise when they learn
that in fact, it is burning merrily."
-Ianto Evans
Quotes from users
- p. 80: "It is extremely efficient, reaching 90 percent
combustion, and almost all the heat is then stored in the cob mass
bench, to be slowly released over days!" -Ianto Evans
- "As for our own bench, it takes about four hours to get totally
warm. From a 4-6 hour burn time once a day or every other day, we can
maintain a comfortable temperature in the house of about 65 [degrees] F,
even on cold days." -Tom and Calleagh
- p. 89 ibid: "On days with no sun we run our stove two to three
hours in the evening, burning about a five gallon bucket full of wood.
For regular winter temperatures of 35 to 50 [degrees] F, this keeps our
house at a comfortable 60 [degrees] to 65 [degrees]F." - Bernhard Masterson
- p. 93 ibid: "Ianto and I measured 1000 [degrees] C (1800
[degrees] F) in the combustion chamber and 32 [degrees] C (90 [degrees]
F) in the top of the chimney --- the rest of the heat was kept inside
the house." - Flemming Abrahamsson
Issues
- No rocket mass stove or stove design has ever been safety certified by the UL.
- Stoves are often self-built to varying dimensions to suit the location and requirements, using a variety of materials.
- Initial lighting of the fire may produce smoke that is often not
drawn into the exhaust system until the burning chamber is heated and
drawing air.
- A common problem with some designs is "smoke-back", where smoke from
the fire is released back into the interior rather than outside.
Smoke-back could indicate a serious risk of carbon monoxide poisoning.
This issue could be a result of poor individual stove design, or
inadequate preheating of the exhaust tube, resulting in inefficient
draft to pull the smoke through.
- Rocket mass heater exhaust is cool, around 35°C, which means in some
conditions it is denser than the ambient air. Conventional chimneys may
not be suitable for discharge without additional energy inputs. (RMH,
p. 93)
- Horizontal exhaust vents may not be compatible with local building codes
Source: Wikipedia.org
Well I am off; well just a little bit, but I needs to get back to work. I must Keep on Keeping On!
The Man Inside the Man
from
Sinbad the Sailor Man
A
JMK's Production
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