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Old 06-25-2013, 03:04 PM   #11
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Re: Rocket stove

Do you have a picture of that setup?

Sounds interesting
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Old 06-25-2013, 06:02 PM   #12
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Re: Rocket stove

Well no we actually settled down in oklahoma. It gets cold here but not bad. Took out the woodstove cage, for passive solar heat. Not as much wood cutting and the bus doesn't move anymore.
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Old 10-10-2014, 09:16 AM   #13
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Re: Rocket stove

old thread, but what about using water as the thermal mass? There will need to be assurances that it doesn't get hot enough to boil, but it's easy to add and remove. Since it's non-potable it could just be muddy water pumped from a river, ditch, etc..
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Old 10-10-2014, 10:40 AM   #14
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Re: Rocket stove

Rocket stoves get SUPER hot, hot enough to flash steam any water if you get it too close to the fire. If you put it back in the not-so-hot part, then it will work.

The problem is you would be spending a lot of energy getting that water from 33 degrees from the almost frozen creek up to comfortable living temps. Part of what makes a rocket stove efficient is that "flywheel" of mass already being warm. If you are parking for a month, it is worth the time/energy to bring the mass up to temp. For a weekend, probably not.

Another problem is rocket stoves need super-dry fuel to work well, they don't work well on freshly gathered wood. If you are homesteading in your skoolie, you can gather and dry wood. For a weekend on the road, again probably not.

Water holds about 5 times the heat per pound as clay or rock, you should be able to hold enough heat in a manageable amount of water to not need to dump and refill. A rocket powered hydronic system. With a two-way heat exchanger to get engine heat while running and pre-warm the engine while parked.
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Old 12-21-2014, 08:21 PM   #15
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Originally Posted by r_w View Post
A rocket powered hydronic system. With a two-way heat exchanger to get engine heat while running and pre-warm the engine while parked.
I've actually been thinking something along these lines as well. This could be especially useful if you're doing a WVO conversion, or even just have a diesel in very cold temps. Lines could be routed to keep the tank warm as well as the block.

I'd insulate the floor as much as possible, use pex just before the actual flooring, probably notched into the last 1/2" of the subfloor supports. Floor heating works so well because heat rises, and it really provides that extra level of comfort when living in cold environments. Being able to walk around barefoot when its in the negatives outside is a great feeling.

In my situation, my aim is to design my build around flexibility. So my rocketstove would need to be removable. But my bus will have a ramp out the back so this won't be much of a problem, even if I put a good amount of cob around the stove.

Having a wood powered water heater would be really nice if I end up somewhere far from civilization for an extended period of time. Having a marine style diesel water heater would provide an even better level of flexibility, and could be ran through the same hydronic system when the stove wasn't in use. In the summer, you switch the floor heating off, so you can use the diesel water heater just for showers and dishes.
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Old 01-02-2015, 08:30 PM   #16
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Hi all,

...just stumbled on this thread....

Another idea to think about is Waxes/Parafines.....

You can get them for a lot of different melting point temps....

The nice thing about these is, once temp gets to that point it will hold it for a LONG time!! It takes about 4x the energy to melt/freeze these parafines, than it takes for water.

Let's say you get a 50C one - it will be solid until you it hits 50. Then it will stay a looong time at 50, while it all melts. Then it will still take lots of energy to heat it further.

Fire goes out - wax starts to cool down. Wax hits50 and now will stay a long time at 50, until all is solid again.

I believe most parafines will be lighter than water and considering the thermal energy specs might make this interesting to put into a closed system.
You probably want a metal-tank, but you can incorporate that into the seating area.....

Sorry - no links. Not in need of any of this for the moment, but articles mentioned various sources available - I suggest you engage Uncle Google....

The articles I read where about turbocharging-inter-cooling for non-race applications - time-delayed heat soaking, max power-cold air preference, partial power-warm air preference, etc....

How ever this should work for a rocket stove just the same!!

Cheers,

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Old 01-02-2015, 10:37 PM   #17
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I like it. If you plan on continuing this research, do keep us posted!
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Old 01-02-2015, 10:50 PM   #18
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Hey Juzty,

....sorry, but I am afraid at things look right now - I am about 200 000 years away from needing a rocket-stove, let alone in a bus.

However, IF I get my bus underway - I'll keep you posted, IF parafine-heat-mass is considered!

Cheers,

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Old 01-02-2015, 10:56 PM   #19
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Interesting, could definitely be used in the subfloor to add thermal mass. The thing about my build is I'd like to stay away from adding as much permanent weight to the rig as possible. EVERYTHING that can be reasonably removed should be able to do so for flexibility reasons. This is why I want my thermal mass in the form of water, so I can leave it behind when I don't need it. Wax wouldn't be quite so easy, and its certainly not lightweight.
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Old 01-02-2015, 11:50 PM   #20
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I like the idea of a wood stove but two things put me off. The first is the fire hazard and the second is the likelihood of unwanted insects coming in with the fuel
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