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Post by mannytheseacow on Mar 25, 2019 21:06:51 GMT -8
Hey everybody- Looking for suggestions for a wood heater for a warmer climate. I need to heat an uninsulated 300 sq ft space that may occasionally drop into the high 40/ low 50s at night, but regularly reaches 80s+ during the day.
A J tube or batch mass heater of traditional sorts is not feasible because the mass would take too long to heat when the outside air temps drop, and radiate too long when the outside temps rise. Traditional woods stove’s too hot too quick and then no thermal storage.
I’m intrigued by the riserless core idea, compact size, and CFB is probably the most accessible material for me, but thinking the standard size would be overkill for what I need and not function if scaled down?
Anybody have suggestions for a tested mini-mass?
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Post by peterberg on Mar 26, 2019 1:14:53 GMT -8
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Post by mannytheseacow on Mar 26, 2019 8:54:03 GMT -8
Thanks for that, Peter. I studied the thread on here for that but it sounded like there was some question about the single skin durability? Perhaps they have been in use long enough now to prove itself? It is an easy enough stove to build. Clay, cob, and firebrick are not available here, but stone, basalt brick, cement, and CFB are.
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Post by patamos on Mar 29, 2019 12:47:11 GMT -8
A coat of clay-sand plaster with 4.5 oz fiberglass mesh embedded stabilizes the single wall substrate considerably. This effectively creates a double skin with superb tensile strength. All in all more stable than a double wall with air space - so long as you take care to isolate the firebox core (if made of dense mass).
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Post by mannytheseacow on Apr 1, 2019 10:20:23 GMT -8
Good point, Pat. I thought about this, and am leaning toward just building a frame from angle iron and building the walls from cement board, then lining the interior either with salvaged bricks or rock to absorb some heat. I'm in a very seismically active area so strength (or flexibility) is pretty important.
Along these lines, the Portugal stove is kind of high for a masonry structure in these conditions. I think I'll utilize the DSR core to lower the overall height, but enlarge the footprint to keep the same approximate bell area.
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Post by matthewwalker on Apr 1, 2019 12:00:18 GMT -8
Hey there Manny. If I were in your shoes I'd probably go with a refined version of your little cooking J. A CFB core and a glass or cast iron top in a small, simple build would probably be more than enough. I think you are going to get just about all the heat you want out of the top.
I'd go with a J for a few reasons, but mostly because they are so simple to build, and I think your fuel is going to be well suited to a J. Any batch type build will need a door, secondary air, and cord wood. That said, batches are fun projects, and you haven't done a new stove build for a while so maybe you just need to scratch that itch.
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Post by mannytheseacow on Apr 1, 2019 15:04:44 GMT -8
Thanks, Matt. I'm always gracious for your input. That's pretty much exactly what I was thinking- slightly modified version of that old cook stove. I am only leaning towards the batch for the horizontal feed to keep it a small boxy thing. The door and air supply are easy to build, and that angled feed on the cook stove was always cumbersome.
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Post by mannytheseacow on Nov 13, 2019 23:32:02 GMT -8
Finished stove posted here: donkey32.proboards.com/thread/3596/inch-100mm-stone-batch-boxIt’s exactly what I needed and the result of what is available locally in my location. Ideally I would liked to have used Matt’s riserless core but I only had access to one sheet of CFB and a few firebricks. Runs well with less than 10*F temp diff b/t outside and inside, and just the right amount of radiant vs. instantaneous heat. Nothing new, just my version of the batchrocket.pt stove (thank you for the suggestion, Peter). Including it here for reference and an example of a successful option for a warmer climate. Thanks to everyone here for their input in the development of these stoves.
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Post by mannytheseacow on Nov 24, 2019 9:32:59 GMT -8
I’m really stoked about the way this stove is performing. I worked out in the pouring rain all day yesterday and came inside in the evening chilled to the bone. The outside temp was only 67f and inside 71f. Not what most would call cold or needing a wood fire. But if you’ve ever been in a rainforest with 100% humidity you know even small temp drops get chilly quickly. Anyway, fire started right up. I would not have even considered trying to start a fire in these conditions on previous stoves I’ve built. Nice even heat with a very small load of fuel.
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