Brian Cady

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since Nov 11, 2014
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Colrain, MA, USA (5a - ~1,000' elev.)
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Recent posts by Brian Cady

Pearl Bigelow wrote:Re: eucalyptus as firewood....about 50 years ago my family lived at the edge of about 30 acres of eucalyptus trees and we used the branches that blew down and various thinnings as firewood.  My father later told me that when green it was some of the wettest and heaviest wood he had ever handled but it cut and split very easily.  However, once it dried it was like trying to split a rock.  Very hard and burned very hot.  So be sure you work it up before it dries out.  



Aren't there many, many Eucalyptus species? Each species might have different splitting properties, I imagine.

Brian
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3 months ago
There are many plants called 'Buckthorn': https://en.wikipedia.org/wiki/List_of_plants_known_as_buckthorn

Maybe you two are seeing two different types of plant.

Frangula alnus = Rhamnus frangula = Alder Buckthorn / Glossy Buckthorn - USA range map: https://plants.usda.gov/plant-profile/FRAL4

https://en.wikipedia.org/wiki/Frangula_alnus

Frangula caroliniana = Rhamnus caroliniana Carolina buckthorn - USA Range map: https://plants.usda.gov/plant-profile/FRCA13

https://en.wikipedia.org/wiki/Frangula_caroliniana

In Wendell, in Western Massachusetts, there are loads of Glossy Buckthorn plants. I haven't noticed it in nearby Colrain yet.
3 months ago
Carla, I hope someday to explore the 'Two-Can' TLUD stove, to see if I could make a bunch of them for folks living in the woods around here. Maybe I can, if I make one, show others how to.

Brian
3 months ago
HI Carla,-

First off, I recommend a search for a used down sleeping bag or two, to survive the cold in. I've used big plastic bag vapor barrier ( rule of thumb: Put VP on warm side) within a sleeping bag in very cold weather to great effect  - I was waking up with cold feet, ankles and calves; with bag, woke up with warm toes. Warning - suffocation hazard.

Second, don't rocket stoves burn fast and clean? Don't TLUDs burn slow and almost as clean?

I imagine a two-can TLUD stove might be slowed down by covering its primary air intakes with a sheet metal band ( from another tin can or beer can?) that could be slid up and down to adjust primary intake air. Secondary air, always unrestricted, completes combustion.

About TLUDs (in case some haven't heard of them):
Microgasification: What it is and why it works  https://woodgas.com/wp-content/uploads/2022/01/BP53-Anderson-14.pdf [2007]
See two-can TLUD in photo on page 6 of : https://woodgas.com/wp-content/uploads/2022/01/TLUD-History-V2-17FEB2016.pdf
Some videos:
https://www.youtube.com/watch?v=Rzu3BxiZpGg Dr TLUD 2013
https://www.youtube.com/watch?v=bmkadnjjO5k
https://www.youtube.com/watch?v=BAzAeZZDQhg

I think TLUDs can be fueled with wood pellets, a cheap, easy fuel that could store in that ammo box and stay dry. Sawdust won't let through enough air to allow continued  burning, I believe. Wood chips, dried, may be ideal, Or pine cones or pine dead branches, snapped off.

Brian
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3 months ago
Here're two snippet videos, one sped up, of vibrating a test block form containing a very dry, thick refractory concrete mix using a recipricating saw and a blade with a hole drilled in it, screwed to the form, that, if not informative, might be amusing.




Brian
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4 months ago

Graham Chiu wrote:If a Walker cabin stove lacks the push to drive under floor stove pipe circuits, then what about a stratification chamber under the floor?  The ondol used a direct thermosiphon with the fire source below the floor level, and when used with coal briquettes when wood sources disappeared, was associated with significant deaths from carbon monoxide poisoning.  So, maybe you need to seal the floor with modern materials rather than clay, and tiles.



Hi Graham, I saw an ondol described in Fine Homebuilding archives. Built in USA, in CA I think, it was covered with 4 inches of concrete. While this might be the easiest wat to get it inspected, I worry that such a large thermal mass addition creats an enormous 'thermal flywheel', so that one might need to predict heating needs and fire it 9-12 hours ahead of when heat is needed. I haven't calculated how much heat or cold could be stored in that design. I do plan to only burn wood, and I am not sure that concrete bests clay for air sealing. What modern material did you have in mind?

Brian
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5 months ago
An advantage of Peltier (TEG) modules is that they bypass Carnot theorem efficiency limitations https://en.wikipedia.org/wiki/Carnot_cycle
so more useful power is potentially available, although 4% efficiency may be more limiting than even internal combustion engines.

Since rocket stoves provide quick intense bursts of heat and these modules might best be used with steady near-constant heat sources, let's consider the near-constant heat output of TLUDs [Top Lit Up-Draft]: ( See:
https://en.wikipedia.org/wiki/Top-lit_updraft_gasifier
https://www.drtlud.com/
https://www.engineeringforchange.org/solutions/product/tlud-champion/)

Here's a related article:
https://solar.lowtechmagazine.com/2020/05/thermoelectric-stoves-ditch-the-solar-panels/

Brian
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6 months ago


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