[Cob] wood stove--- heads up

[Bill&Julie]

Hidare,, ~¿~ In any design, sizing is important.

If you design a stove to heat your whole house, and be efficient at -20°f,,

Then any temperature above that you will have to throw away energy.

By that I mean, cooling the fire by closing the draft, allows smoke to

go up the chimney unburnt..All smoke that is HOT enough will burn...

Side note: When the smoke reaches a place in the chimney that is

cold enough it will sweat and run back down the chimney as creosote.

So,, How important is efficiency,, and how important is the magical

100% efficiency???

In Northern Minnesota,, the trend is towards the OUTSIDE FURNACE..

The beauty of these is to leave the draft open until the wood is gone,

allowing enough air to combust all of the fuel at a high temperature.

Trapping the heat in a well insulated water jacket, and then pumping

the hot water into the house as needed for what ever warmth that is needed.

Search the web,, there are many examples of these...

Back to the bottom line,,, did Granddad survive in his 50% efficient house?

Must we spend tens of thousands dollars to save a few hundreds???

Find a good design, and use it... Don't worry if your 83% system is not

as good as some guys 84.5% system..

Things to ponder Bill






----- Original Message ----- 
From: "Amanda Peck" <ap615 at hotmail.com>
To: <coblist at deatech.com>
Sent: Thursday, August 26, 2004 12:01 PM
Subject: Re: [Cob] wood stove


>
> But the cob bench would be nice and warm to sit on!
>
> I really really don't want to mess around with my compost pile enough to
be
> able to heat water, although I do run a thermostat down into it
> occasionally, try to keep it working until that box is filled, then let it
> set for a year or so before I spread the compost and reuse that box.
Think
> adjusting carbon/nitrogen levels, keeping enough mass in the pile(s) so
that
> they stay working all the time, turning frequently.  For one person it
would
> probably mean importing material, possibly weekly.  I've seen solar water
> heaters that work just fine, thank you, require a twentieth of the effort.
>
> The big masonry stoves have been around for centuries in Europe.
Literally
> the only thing I can remember from the Brothers Karamazov was that one of
> the brothers climbed up on the stove and went to sleep.  The ones one sees
> in the masonry stove web site are gorgeous and look like they were built
by
> experienced masons.  Ditto the all store-boughten ones, which can run "up
> to" over 30k.  They start a lot lower, but are still a serious investment.
>
> http://mha-net.org/
>
> fireplaces from these guys are the ones that top out in the "up to" range:
>
>
http://www.tulikivi.com/www/homeeng.nsf/wwwframeset_lämmityslaitteet?OpenPage
>
> The rocket stove/cob benches aren't that far off, show promise of being
> easier to build by oneself.  There is probably quite a bit of history
behind
> those as well.
> ..................
> Quinn wrote:
> There has been so much talk about trying to make a stove do something it's
> not intended to do: heat a bench.  It doesn't sound like a safe,
> environmentally sound, efficient or useful idea.
>
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