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electric heater efficiency - Page 8

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Posted by Josepi on November 28, 2010, 2:55 am
 
That is the trouble with so many "green" technologies. A complete backup
system that is reliable needs to be in place and the economy gets
questionable considering, loss of income on investments and other long term
factors.


Jim,
I asked the question in the context of comparing different fuels for
estimating costs of space and water heating; it seems to me that heat
flow for any particular home would be about constant for any heater
regardless of the fuel. I've been planning for solar heating, but as
with anything AE, a back-up seems necessary and since reading some of
your posts, I've been taking a harder look at wood as a back-up.

Thus the 60-65% for estimations in wood stove planning question.

Curbie


On Sat, 27 Nov 2010 16:31:25 -0800 (PST), Jim Wilkins


Posted by Curbie on November 28, 2010, 3:52 am
 
I agree there's an issue with AE technologies requiring back-up and
that certainly plays into the economics of return on investment. I
also consider thing other than ROI like security (self-sufficiency)
and "Green" (political and ecological) concerns into my "return on
investment" calculations because those notions have value to me also.

I also feel pretty comfortable in looking at supply and demand trend
lines for energy prices, instead of using current prices in "return on
investment" calculations.



Posted by Jim Wilkins on November 28, 2010, 3:04 am
 
I wish I had a good answer for you. Wood brings a lot of issues with
storage, smoke, inconvenience, etc. It isn't for everyone. How common
is wood heat in your area?

jsw

Posted by Curbie on November 28, 2010, 3:28 am
 Jim,

I had a chat with a local tree service who pays to dump at the local
dump, that load includes both a majority (by volume) of chipped
branched and a minority of raw logs. Since I might have interest in
both (compost and fire wood logs) as long as they can come in at their
convenience and dump the whole load, the owner I talked to seemed ok
with the idea.

Curbie


On Sat, 27 Nov 2010 19:04:22 -0800 (PST), Jim Wilkins



Posted by Jim Wilkins on November 28, 2010, 2:09 pm
 
I get free wood from many sources including old lawn trees. Oaks with
large lower branches are significantly harder to split than straight
forest ones that died before reaching the canopy. The worst and
largest forks can be sliced lengthwise with a chainsaw but that's very
inefficient. I gave up and bought an old log splitter to rebuild.

My back complains if I bend down to cut wood on a timberjack for long
http://www.northerntool.com/shop/tools/category_logging+logging-accessories=
+logging-hand-tools
so I lift logs higher like this:
http://picasaweb.google.com/KB1DAL/Firewood#5287788505171720306

Trees cut green harbor insects that will hatch when they warm up. You
can bring that wood in as needed or store it outside for two years.
When I was house-hunting I saw several moldy walls from storing damp
firewood indoors.

jsw

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