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Post by yigenuren on Aug 28, 2010 5:18:37 GMT -8
I want to have my ducting exit out down through the floor and out the side of a strawbale base/foundation. Should the chimney stay horizontal or should I have a vertical stack? Will the carbon dioxide flow out easily or could I be looking at some serious problems with a downward slope and exit? Need some advice before I poison myself  . |
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Post by peterberg on Aug 28, 2010 8:12:14 GMT -8
You won't poison yourself with carbon dioxide, because it isn't poisonous. Carbon monoxide on the other hand is very, very harmful. Of course, that's what you mean.  CO is heavier than air, so it is possible to have the exit of the rocket stove at a very gentle slope and without a vertical stack. Getting the thing started will be difficult this way, because there will be no stack effect initially. To be on the safe side, try to get out of the building horizontally and use an insulated vertical stack of say, six feet or more. At high temperatures CO will be converted to CO2, which itself is harmless. It's all around us in the air we breath in. Rocket stoves are surprisingly good at that conversion process. The conversion process itself is generating heat, so CO could be considered as fuel. |
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Post by yigenuren on Aug 29, 2010 21:27:05 GMT -8
Oops Carbon MONoxide ;D
I don't want to cut a hole in the side of my yurt as I might not be happy with the local and want to relocate it when/if I redo the heater. What is the 'stack effect' and how would starting the heater be difficult without it?
Also I got a really nice piece of 1/4" thick 8" diameter pipe for my heat riser but it was cut about 2" taller than my barrel. Do I have to cut the pipe or can I just add more bricks or cob for the barrel to sit on to get that 1 1/2" clearance above the riser?
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Post by peterberg on Aug 31, 2010 10:53:18 GMT -8
The draw of a chimney, caused by the temperature difference between inside and outside is called the stack effect. A rocket heater could be started without a vertical chimney, but at first it will smoke back more or less. Once the heat riser has picked up heat, the exit pipe could be horizontal without problems. Preheating the riser with a propane torch or other means would solve the startup difficulties.
When practical, you could lift the barrel. But it's best to make a mock-up first and see how it runs before building the whole contraption in your yurt.
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