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sending exhaust out the wall vs. the roof

 
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Location: Northern Germany (Zone 8a)
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ole,
it might look like that your horizontal run is a bit too long? what s the lenght?

have you tried feeding smaller sticks that totally fit inside feed tube?

my general thoughts on vertical exhaust are that these systems are very volatile. you change one parameter a bit and that whole thing might backfire. in your case, ole, it looks like several parameters are working against you in this case. when these add up, things go wrong.



ok, this is a abit far out... exhaust temperatures should be very low. what about building a chimney from wood? just wondering ...
( i m feeling like highjacking this thread, so if anybody sees the need to move parts of this discussion...)
 
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"a 5 meter high dobble insulated steel chimney, as would be required here"

Do you mean that building code would require such a chimney, or that you think that is what would be needed? While I'm sure a chimney that big would be good, it may not be necessary. Even a single-wall 2 meter chimney might be enough for your system to work. I would try some more experiments to see what does it. The exhaust is going to be cool enough that you can probably paint the chimney with some camouflage to make it practically disappear.
 
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Tobias: Length of the horizontal run is about 27 feet.
I tend to agree with you, too much is against this construction.
Exittube is about 30 degree celcius with outside temp at zero.
You are not hijacking anything, Im very happy for all contributions!

Glenn: Yes, because of the two storage building, the chimney must be 5 meter high, and dobble insutaled is a must. So there are good reasons to find other solulions

Ianto, ok, I think I get it now. Next time I try, I will make a 6 feet riser and a biiiiiiig voluminous bell.
 
Glenn Herbert
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Exhaust about 30 C... that's barely warm. Why would you need a double insulated chimney? I suppose that would keep the exhaust from getting too cold...
 
Ole Blente
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Yes, you are right Glenn. The insulated chimney would help.
Allthough it is purely mafiosic regulations ;-(
But you know, with a regular chimney fire you would like to have it over the houseroof.
 
Ole Blente
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Well, I got very inspired by this idea some years ago. This autumn I wanted to realize the idea. Now, 4 rebuilds later, I can conclude with a simple answer: The riser is by far high enough to create the needed draft. With a simple bathroom ventilator, drawing 90 m3/hour everything works just fine. And I suspect all my previous builds might have worked just as fine this this kind of draft.
 
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