I would not use asbestos. Just me maybe but....jlhollowx13 wrote:I think a smaller rocket stove, made with a 30 gallon drum, maybe some asbestos insulated stove pipe surrounded by fire brick and sand, encased by a wood frame, just to keep it simple, might work in a bus...
lornaschinske wrote:I would not use asbestos. Just me maybe but....jlhollowx13 wrote:I think a smaller rocket stove, made with a 30 gallon drum, maybe some asbestos insulated stove pipe surrounded by fire brick and sand, encased by a wood frame, just to keep it simple, might work in a bus...
I think there should be a "lighter" something you could use as thermal mass. There is a Rocket Stove Mass heater on Instructables that uses lightweight vermiculite.
red_zone wrote:I registered because I was browsing through and the rocket stove designs caught my eye... and I had some ideas to share.
The beauty of the rocket stove is that it's a totally passive heating system, but such a radiant system requires a large thermal mass to heat up, long runs of exhaust pipe for the exhaust/combustion products/smoke to transfer all of its' heat.
So, to scale down to bus-sized there may have to be two things that need to be cut - mass, especially, and exhaust duct length.
Now, the ones I've seen in all the videos have used vermiculite, clay, lots of brick, etc. Vermiculite is highly insulative, has high heat capacity, and is very light.
What you really need to store all that heat is water. Water has the highest heat capacity of any readily available material, and is the best heat storage available. This is why trombe walls in solar buildings are filled with water. Efficiently transferring the heat from the air to the water is the challenge. Luckily, this has been done; your engine does it in reverse with the radiator.
I think a small rocket stove (the 30 gal drum suggestion?) with a soapstone firebox and a radiator with a pump to circulate water into a thermal storage tank would be the best option for a skoolie. Drain your thermal mass if you're traveling for better fuel efficiency and hill climbing... if you know you're going to camp near a water source. Soapstone has the best heat capacity of most natural stone materials, equal with fire brick, and can be salvaged from broken counter tops - ask for scraps from your local custom kitchen store. This way you have 50-70lb of firebox, insulated with vermiculite for slow heat release. Water tank could be any shape - put it under your bench or under the bus (heavily insulated and with another pump for under floor heat? That'd be neat, and a way to control the heat release back into the bus. Downside? 2 pumps.)
I'd worry about over-heating more in a bus than a house, you can't move but so far away from the stove. If you drain your water and cannot refill, at least the firebox should hold at least as much heat as a cast iron woodstove.
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