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Heat from Willows - Page 2

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Posted by Joe User on January 31, 2006, 9:35 pm
On Tue, 31 Jan 2006 21:14:53 +0000, Drew Cutter wrote:

I heat with wood, so let me give a SWAG.

For a 20-year tree, about 1ft in diameter.

1 cord comes from about 10 trees.  This depends strongly on the species of
the tree.

Willow is a low-heat-content tree, so in a New York winter, with an
average house, you might need about 4 cords of wood.

So, each winter, you need 40 trees that have been growing 20 years.

So, you need about 800 trees at various ages to have a sustainable
woodlot.  Big trees are about 60 per acre, but these 1 ft willows
might be at about 200 per acre.

So, you need about 4 acres in your woodlot to be sustainable.

Adjust the numbers to suit your situation.

    If a woman has to choose between catching a fly
    ball and saving an infant's life, she will choose
    to save the infant's life without even considering
    if there is a man on base.
        --  Dave Barry

Posted by daestrom on January 31, 2006, 10:12 pm

I take it you're talking 'full cord', not the often misused 'face cord' ??


Posted by Drew Cutter on January 31, 2006, 10:56 pm
 Call biologist friend of mine . Hybrid popular grows 10' a year. Can't
cut popular until its 5. Better than willow. Just wish it didn't take
that long. New question. How many popular tree would it take for a cord
of wood ?

daestrom wrote:

Posted by Steve Spence on January 31, 2006, 11:51 pm
 Drew Cutter wrote:

A cord is a stack of wood 4' x 4' x 8'

Steve Spence
Dir., Green Trust, http://www.green-trust.org
Contributing Editor, http://www.off-grid.net

Posted by Joe User on February 1, 2006, 8:09 am
 On Tue, 31 Jan 2006 22:56:54 +0000, Drew Cutter wrote:

It depends.  If you are talking about a 1 foot diamater tree, about
10 trees per cord.  That depends on different things.  In Tennessee, a
yellow poplar can grow 1 inch in diameter per year, on a good site.

Yellow poplars are not really poplars. They are tulip trees. Both yellow
poplars and true poplars have a very columnar habit, so they
 grow closer together with less branching and topping than most other

They only grow 10' per year for a couple of years.  After that, they gain
weight faster as long as they have sunlight, but they grow taller slower.

You should more properly ask "How many tons of plant material can tree
species X produce on 1 acre per year around here."  Environmentalists and
foresters can answer that kind of question.  I don't know.  I have some
acres planted in yellow poplars for saw timber in the distant future.  I
know that those poplars really suck as firewood.  I do burn a lot of them,
though, because they are available and in the way.

But, if you were burning wood commercially, I don't think species would
matter much.  It's just home heaters who have to care about the qualities
of the wood available.  Industrial users just bulldoze the wood into the
grinder and feed grinder output into the burner.  They can burn anything
as long as there is not too much trash mixed in.

This does not have anything to do with solar thermal heating, though.

    Identities are constructed out of whom one dislikes and why.
        -- Jonathon K. Cohen (in talk.bizarre)

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