by vtsnowedin » Tue 08 Mar 2011, 21:01:40
$this->bbcode_second_pass_quote('anador', '')$this->bbcode_second_pass_quote('misterno', '
')I see your point but here is another question
can anyone go to any forest with a chainsaw in his hand and cut any tree he wants?
Isnt' there a law to prevent this? I would imagine you are probably cutting the old decaying trees not the young ones ( I hope)
Am I right? Otherwise, what if the local enforcement sees you?
I don't wanna see the days where thousands of people go to the nearest forest and cut any tree they can get their hands on when oil hits above $150.
Well we don't use cut wood from our woods, except where we are already clearing for pasture. We do use dead wood already on the ground, and always from our land. It would be illegal to use cut wood from others land, and I in no way defend stealing wood.
It is possible with high efficiency wood-gas and proper regional wood-lot management to sustainably grow and cut trees in a cycle on specific woodlots for that purpose, as I demonstrated in this thread.
That leaves sensitive environments alone and treats wood as an agricultural commodity.
$this->bbcode_second_pass_quote('anador', '[')img]http://sphotos.ak.fbcdn.net/hphotos-ak-ash2/hs399.ash2/67712_1474027379193_1488930125_31059148_2615203_n.jpg[/img]
Okay, just did some calculations.
Lets say we take a 500 acre area, a zone which would contain 500 structures, no shops, and no institutions, and no food production in a typical sprawl pattern.
By applying proper low-energy-urbanism the 500 acre zone now supports 660 structures, with attendant shops, parks, farms, and institutions. A town.
The population has been doubled from 1,500 to 3,000
There are now 425 acres for growing to 75 acres of town.
Outside the inner 425 acre food ring (capable of sustaining 3400 people if biointensive practices are used) there are 3 rings of 208’ in width each
The first ring supports 84 acres of trees
The second ring supports 86 acres of trees
The third ring supports 92 acres of trees.
These rings acts as wood-lot energy producers for the town with a five year harvest cycle.

From the paulownia supply info. site the trees can be planted with a density of 132 per acre. Each tree produces 122 board feet of wood in a five year maturation period. 26 acres are harvested per year yielding:
132x122x42 bf per annum or 837,408 bf per year.
A cord of wood contains on average 500 bf so the production in cords per year is 1,675.
The 660 buildings each receive 2.5 cords of wood per year
Electrical generation by water jacket steam turbine generation have managed to achieve up to 70% efficiency.
“One cord of well-seasoned hardwood (weighing approximately two tons) burned in an airtight, draft-controlled wood stove with a 55-65% efficiency is equivalent to approximately 175 gallons of #2 fuel oil or 225 therms of natural gas consumed in normal furnaces having 65-75% efficiencies.”
So the equivalent in heating oil used for the demonstrated 1675 cords per year represents approximately 293,125 gallons per year or 444 gallons per structure per year
Reasonable amount if your climate isn’t too severe. Would work fine in New England.
You would have to plant more rings in more harsh areas. I would also say a factor of safety would have to be considered anyway, as these numbers are all taken off the internet and may not reflect what really happens.
But still, supporting the energy and food needs of a small town in the space taken up by a large subdivision isn’t that bad!
Sources:
http://www.zilkha.com/category/tree-facts/http://www.iowadnr.gov/forestry/definitions.htmlhttp://www.paulowniasupply.com/why_grow ... cially.htm Also vtsnowed in, you are right about efficiency and that many older boilers do have smoke trouble, especially when people burn garbage. But we and our neighbors have used this system for several years and we have never had a complaint. We do generate smoke when starting up a cold furnace, but only as much as a fireplace would.
Yes if everyone scavanged wood waste it would dry up as a free supply, but thats no reason to allow all that wood to go to the landfill now, when it could be used for biomass now.