After a whole lotta prodding and foot dragging, I managed to upload a product over at Scubbly. If anyone's interested & until I get things sorted you can get the sketchup models of shippable woodbox core versions 1.2 & 1.3 for $1 at my new storefront here:
Jesse Biggs' Stuff Worth Making
Always good to hear from you Peter. The big batch box in Idaho is burning very well and getting upgrades as the owner can get to it. My own is currently on hold and I know of another 6" batch box being prototyped locally.
Do you happen to have any insight into this particulate business? Are you aware of what the masonry heater crowd has come up with in this space?
Also, is there a way for me to learn more about this modified air intake you speak of?
Brett Andrzejewski wrote:I was looking for scientific publications on anything closely relating a rocket mass heater just the other day. The closest thing I could find were journal publications on particulate emissions for masonry heaters. The studies were typically performed in Europe. When I lived in Germany my friend told me they were quite concerned about combustion particulates (diesel trucks and wood burning, typically).
How I found the articles (abstract only typically):
did a search on 'masonry heaters'
Thanks for the response Brett. Do you remember any numbers off the top of your head? It appears that numbers from masonry heaters is the closest thing currently available?
By way of an update... I decided to follow Peter's advice and fab a lid and door out of castable refractory. This way I have a material that can withstand the temps and I'm not worrying about different expansion rates between brick and concrete.
Your input on bench sizing is much appreciated. I've calculated a barrel to be roughly 1.5 square meters of surface area, and the horizontal duct to be roughly half that or .75 square meters per 5' length. I was going to shoot for an overall surface area of between 9 & 10 square meters.
I've noticed there are more and more perma-centric models in the Google Sketchup 3D Warehouse and thought it might be cool to share and expand on this theme. This is my first contribution 3D Warehouse model of Paul Wheaton.
Time to feed our natural yeast start. It's a special treat for the hens when there's extra. They clean the bowl with extreme prejudice then turn it into the best eggs around. Systems feeding systems feeding systems!
Miles, I'll see if I can work something like that up. It might take me a day or two. I'm not sure the hogan version fits in Paul's definition...
1) every drop of rain must always have a complete downhill soil path. Encountering the edge of the roof is not okay.
2) There are two layers of polyethylene. The lower layer, which hugs the structure, and the upper layer, which defines the thermal mass that surrounds the structure. The upper layer must cover at least twice as much square feet as the available square feet in the structure.
3) The uphill side has at least three open trenches to move water around the structure.
4) The uphill side has a roof that extends at least three feet beyond the exterior wall.
5) There is at least four inches of dirt between the two layers of polyethylene. There is at least sixteen inches of dirt on the top layer of polyethylene.
6) The inner pole structure is made of logs.
7) No treated wood is used in any of the structure.
All polyethylene is surrounded on both sides by at least 10 sheets of newspaper. If the wood shell is unmilled logs or poles, much more newspaper must be used."
Here's another round of the "nixed" version. There are even fewer posts and beams and the roof eave to ground angle has been changed to make for better piling-on and retaining of thick earthen roof stuffs.
Erica, here's my understanding of the "back area":
There are 2 things going on there...
1) It is shown here as kind of an "uphill patio" as found in Mike Oehler's book. The idea being if you're building on the side of a hill, and the hill wants to "go visit the neighbors", you have this whole area as a buffer zone to that kind of activity.
2) Paul has added more of an overhang and the fancy "wing walls" to further protect the exterior bits of the wofati from the elements.