Yes, I've been reading as many of the rocket threads as I can. I definitely agree about the potential dangers of heating water ... all this stuff is just some concept exploration for now. I've ordered the book, but will also be on the lookout for one of the Mass Heater classes.
I've realized that the first pics have too long an exhaust run and the actual "house" is way too big. I'm working on something much smaller using PSP, PAHS, and the Rocket heater. With PAHS, the insulated mass of soil is actually inside of the house envelope, just on a larger scale than the bench.
Good data point on the exhaust wanting to go downhill. I'm also struggling a little with cleanouts.
These pics are made with Google Sketch-up. I'm using the free version (for now), but they also have a "Pro" release with many more features and tools. Here's a rough model of a Rocket Mass Heater set into the floor. This reduces the height of the unit and I've added a 1/2" thick steel plate on top for cooking. I'm thinking that the plate will function similar to the cooktop on my wood burning cookstove with different heating zones, etc. I am imagining that the area directly above the insulated "chimney" will get very hot!
Maybe we should rename this thread "how I learned to use Sketch-up"? I'm spending way too much time messing around with this when the weather is still so nice, lol.
PSP is Mike Oehler's Post, Shoring, Polyethylene technique for underground housing
PAHS is Passive Annual Heat Storage, a technique for storing heat in an insulated soil volume surrounding an underground house, designed by John Hait and the good folks at the Rocky Mountain Research Center
I've been thinking about ways to combine the two, and the Rocket Mass Heater just seems like a natural complement to both ideas. The initial thought was to put the heat from the RMH into the insulated soil around the underground structure instead of into the "butt warmer". However, putting that heat anywhere within the insulated volume is effectively the same thing.
It's also quite warm here in the summer and underground/earth sheltering will keep it cool inside. So, one of my (many) goals is to build a PSP-PAHS-RMH home across the orchard from this house.
Thanks for the real-world data on cooking. My musings led me to expect otherwise and actual experience is helpful and welcome on this journey.
paul wheaton wrote:
Ever since learning about all of the rocket stuff, I've been kinda against the cob oven idea. They are so smoky and they seem to waste a lot of fuel.