stratification chamber in a rocket mass heater with matt walker

http://richsoil.com/heat Shamelessly stolen from the world of masonry stoves, the word "bell" with rocket mass heaters can mean several things. So we go with "stratification chamber" to reference heating the mass (as opposed to the similar stratification that happens in the barrel). Matt Walker is building the outdoor rocket mass heater with smoker as he describes the stratification chamber technique he prefers. He likes to use a half barrel.

He mentions filling a tub with water and if you flip it upside down, you fill it with hot exhaust gasses. It comes with interpretive dance! I felt like it might not be clear to everybody, so I paused, added an animation and description, and then rewound and did the thing with matt again - my thinking is that on the second pass it makes a lot more sense to everybody.

My animation shows filling a bucket with water because the water is heavier than surrounding air. Then I flip it upside down and fill the bucket with hot air. This is the same sort of effect you get with a hot air baloon. I then demonstrate that the bucket conducts heat, so the gasses in the bucket cools as the surrounding air is warmed.

In time, the heat stratifies with the hottest air at the top and the coolest air is at the bottom.

A regular rocket mass heater has a duct that starts low and finishes high. The heat is forced to the far end of the bench. The vertical exhaust near the barrel gets a bit of extra heat to make it rise - a tertiary thermosiphon.

All the crappy animation is by me!

On a larger scale this would be called a kang bed stove or a roman hypocaust.

After raising the manifold exhaust, use a hollow bench - with a large cavity. The hot exhaust enters the chamber and spreads out evenly. Then the coolest gasses are extracted from the bottom.


More about rocket mass heaters in our DVD set at

https://richsoil.com/wood-heat.jsp


http://permies.com

Thanks to Dan Ohmann of The Grass-fed Homestead channel for helping me with the editing:

   / @thegrassfedhomestead  


Relevant stuff at permies:

https://permies.com/t/48651/rocket-ma...
https://permies.com/f/260/rocket-mass...
https://permies.com/u/149366/Matt-Walker
https://permies.com/wiki/63312/Rocket...


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