Johannes Schwarz wrote:I would like to thank everyone on these forums for sharing and helping others.
After browsing through the RMH section I ended up with something called a Vortex Stove (More about the thing here: http://donkey32.proboards.com/thread/703/vortex-stove?page=1) which has some horizontal Rocket Action going on, but I guess is a wood stove and thus belongs here.
To give back to this community I wanted to share a timelapse-ish video of the build, to encourage people to experiment. If I, a priest and theologian in training, can do this, most of you will do much better still. So without much further ado, I present you with the "Hermit's Hot Hog"
Johannes Schwarz wrote:Hello everyone and thanks for the kind words.
I posted the video a couple of weeks ago, so I was surprised to see a big spike in the vimeo view count this morning. I guess, this means it got cold wherever you guys are. Heating season is on
The way it behaves is like the Kachelofen (Grundofen - ask google for pics, I did not get a proper translation. It is typical for Austria and southern Germany) I grew up with. It stores and radiates heat for 10-12 hours.
exhaust pipe temps right out the stove peak at 300°F (i also built a short cut for a better draft, which I use when kindling the fire) and go down to about 170°F. When the fire is out, I flip a lever to put the damper of the pipe to use.
surface of thermal mass reaching 180°F in some parts on top. 150°F in others. Since the surface is not smooth (like metal or tiles) but rough, it can be touched and leaned against, though during the hottest time of the cycle I would not press myself against it for too long
after 10 hours: thermal mass temp is at 110°F
after 12 hours: thermal mass temp is at 90°F
after 18 hours: burn chamber walls (inside) still radiate in the 90s. Thermal mass section has room temp (71°F)
I plan to experiment with a heat sink around the stove pipe to reduce heat loss through the exhaust.
One further modification I plan is a tube for secondary air in the top half of the burn chamber. The burn is clean as it is, but oxygen is always fun to add and should give even better efficiency burning all gasses. At least I think it will.
I don't think I need any of these improvements to make my place warmer (though we will see in winter - I'm in the alps at 4000 ft), but if these tweaks make the stove more efficient, they will save some wood.
Johannes Schwarz wrote:
A Kachelofen of the Grundofen variety with its layout of "heat channels" will need to be carefully planned (and usually built) by a professional to work. It can easily cost from 4.000 Euro to 10.000 Euro depending on it's desired heat storage capacity. But it belongs to the most efficient wood burning systems out there and is the "heart" of any house that has one.
It was mainly the price tag and the practical impossibility of getting a professional Grundofen builder to my mountain hut that made me explore alternatives and landing me here Now I'm happy with my hybrid combining different concepts. But I also did get a CO alarm, just in case there is an issue with the chimney airflow and I have gas coming the other way. I am after all not a professional. And what I was allowed to build here in Italy, would have required expensive certification by a chimney sweep in Austria. Stricter laws over there.