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Wood stove with heat exchange extension

 
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Hello Permies community,

We just bought an old stone house in the catalonian Pyrenees. Winter is coming and there is only an open fire place to heat the living room.
We want to make use of the fire wood we are able to secure easily. My parents live in the same village and gave us a traditional metal wood stove.
So far, so good.
Now, we are aware of the existence of rocket mass heaters and of the fact that a conventional stove emits enormous amounts of heat but just going out of the chimney.
We would really like to use this wood stove, however we want the heat to stay in the house.
So that's why we came up with the idea of extending the stove with the heat exchange capabilities of a rocket mass heater.
So, basically, a wood stove, a heat riser with exchange barrel, a heat storage bench and a chimney.
I've included a picture of a rough sketch.
What do you think? Are we mad and is it bound to fail? Or is there a chance it might work? And does it need adapting, which I feel it probably will?
Especially the bend down from the stove top to the barrel bottom seems problematic to me.
The bench is especially lifted from the ground, so this bend would not have to go that low...

Jeroen
20181020_234408.jpg
[Thumbnail for 20181020_234408.jpg]
 
gardener
Posts: 3050
Location: Southern alps, on the French side of the french /italian border 5000ft high Southern alpine climate.
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Jeroen. It's been done. Check the threads at donkey32.

Near you, there's an association who has donne it iirc.

http://uzume-asso.org/batchrocket_plans.html#sidewinder_8600W
 
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Location: +52° 1' 47.40", +4° 22' 57.80"
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woodworking rocket stoves wood heat
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Jeroen,
By the look of it in the drawing, the woodstove seems to be a Turbomasse stove. That type of stove does need a lot of draft to work properly so cooling down the exhaust gases won't work, the chimney need to be quite hot in order to keep the thing going. To be frank, just adding a bench or other heat extractor to a random stove is bound to fail. In case it does work, it'll come together with a lot of pollution and tar dripping out the chimney pipe.

In januari of this year, Uzumé association tested such a construction and it failed miserably.
Here's the link, the website is in French but Google translate is quite good at what it is set out to do.
http://uzume-asso.org/session_batch_2018.html#turbomasse
 
Satamax Antone
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Location: Southern alps, on the French side of the french /italian border 5000ft high Southern alpine climate.
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Thanks a lot Peter, that's what i was looking for.
 
Jeroen Nagtegaal
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Thank you so much Satamax and Peter for indicating that experiment!
Indeed it is that type of stove.
Had been searching for examples on the internet, but found none. But we did not search in french.

It is clear we should not even try it.

Guess we're going to use the stove conventionally this winter then, and make a plan for a rmh installation next year.

Thank you for preventing us from loosing time and putting our house safety at risk.

Jeroen
 
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Jeroen -  as a temporary fix for this years winter, you could try dry-stacking masonry bricks (or similar) around the sides of the metal stove to at least give you a certain amount of mass storage for the excess heat coming from the stove.

I've tried that on a couple of our wood 'box' stoves and it does help a little
 
Jeroen Nagtegaal
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Thank you for that suggestion John! Seems like a good idea and not difficult to do. A little bit of mass storage is more than nothing.

Jeroen
 
A "dutch baby" is not a baby. But this tiny ad is baby sized:
A rocket mass heater heats your home with one tenth the wood of a conventional wood stove
http://woodheat.net
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