Yes, since the 70s a lot of elm has been available as dead standing
wood, also the beetle forms galleries under the bark which bird
subsequently knock off in their searches, so the pole desiccates
standing. Green elm has a 140% water content dwb (IIRC).
Yes. You can make a fairly good estimate of the heating value of wood
by first subtracting the ash weight then multiplying the remaining dry
wood weight by 18MJ and subtracting the water weight times 2.7MJ (this
makes fairly broad assumptions about flue temperature).
To refine this a bit you need to treat the proportions of lignin,
cellulose and hemicellulose separately, lignin has the highest
calorific value and forms a larger portion of conifer wood.
Ash by a long margin then probably birch and sycamore.
On 29 Nov 2003 22:13:26 GMT, firstname.lastname@example.org wrote:
It was from memory so I did not refer it back to wet weight basis. The
dry weight basis refers the water content to the oven dry weight of
the wood so if the oven dry weight is 1kg the water content is 1.4kg
and the total weight is 2.4kg. As a wet weight basis percentage this
means the mc would be 1.4/2.4X.3% hic :-)
Well, ash - good it seems.
Blackthorn/damson/wild cherry/all fruit trees - slow to catch and slow
to burn, makes great charcoal.
Oak - thats OK, but spits even when dry sometimes
Poplar? Mmm. Think its good. Haven't burnt any for some time tho.
Beech. Ditto. None around here.
Leylandii - fantabulous stuff, but somehat TOO inflammable.
Willow? Too wet to burn green easily, and may spit, but dries fast.
Elm? what elm? :-)
Elder. Good kindling once dried a bit.
Sycamore. Mmm. Think its dense and slow burning. good.
Field Maple. See sycamore. Very good.
That's pretty much all I have in the woodpile right now.
All basically burns once the fire is hot enough.
On 28 Nov 2003 12:52:39 GMT, email@example.com wrote:
Yes, I pointed out earlier in the thread there is not much to choose
between logs of the same moisture content, though the bulk can be
pertinent. Certain species are slower to dry though, try taking cut
and split oak and sycamore into a dry room and note the rate of weight
Matches are made from aspen, but wax is added to sustain combustion
and one, I believe the UK's biggest, supplier of kindling, uses oven
Andrew Heggie < firstname.lastname@example.org wrote:
I cut down a few large willow trees (not weeping
willow) a few years ago and they seem to have seasoned
into quite an acceptable wood for the woodburner.
Weeping willow seasons ok to a low moisture, but feels
quite light, and without much calorific value.
On Fri, 28 Nov 2003 13:45:06 +0000 (GMT), Tony Williams
Yes it has a high initial moisture content and low oven dry bulk
density. Hybrids can be very high yielding in trials of arable short
rotation coppice, transport costs are a hindrance with water and
Willow is apparently the fastest way to acumulate combustible biomass.
What it lacks in density it more than makes up in speed of growth.
ISTR from a county show some years back that you can actually get
heating plants designed to burn relatively wet willow cleanly..
..in case anyone is faintly interested.
I have never paid cash for firewood, as its amazing how much you can collect
from various places. The quality depends on how fully you are.
Not paying of cource means you have to work to collect it, so you fetch and
carry & chop and dry and carry - all of which is joyy good exercise.
I will chop peoples trees down for free, take the big logs and put the small
stuff in a skip they provide.
I have recently discovered a saw mill that dumps the stuff next to the road for
you to take, of cource is still wet, and it needs cutting but its cheep
Depends on the size of vehicle. It's like a spoonful - the actual
quantity depends on the size of the spoon and whether it's heaped.
What you get from that supplier.
It's all very vague I'm afraid. The weight depends on how wet they
are, how many there are, what sort of wood and so on. The quantity
depends on the supplier and local demand. Cowboys will stack the logs
to take up more space, so look more impressive. Good guys will stack
the logs to take up less space. The middle ground guys just check 'em
in and let 'em fall.
As to what vehicle - a Hilux is generic, expect around half a ton
(wheelarches inside remember, and if it's panelled you'll lose a lot
of logs). Transits more, usually a tonne (ish).
Sometimes hard to find a decent, honest and reliable supplier - so
most folks hang onto them when they do.
Simon Avery, Dartmoor, UK
uk.d-i-y FAQ: http://www.diyfaq.org.uk /
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