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Posted by Curbie on April 21, 2009, 4:16 pm
 

I saw/read something about a stove-pipe which was actually two
stove-pipes, one within the other, the inside pipe (I think?) was the
exhaust and the outside pipe was the air intake. As the stove's
exhaust exited, it heated the incoming air for combustion. Sounds like
you have your circumstances "nailed down" just interested in your
opinion.


I'm real grateful for all the free and useful information on the net,
and I'm sure they publish their base or threshold value somewhere, so
generally speaking that is the way to go.

I interested in a variable base (or zone) numbers Example:

If I wanted to maintain 68°F daytime inside ambient but was willing to
inside ambient drop to 60°F at night, while maintaining a "around the
clock" 74°F ambient in an attached green-house, the HDD would change
for each condition. I'm also interested in GDD, plus having all the
other data in TMY for reference seems worth the effort. Any way, know
where to come for sub-set data or the whole thing if you play
databases.

Curbie


I saw/read something about a stove-pipe which was actually two
stove-pipes, one within the other, the inside pipe (I think?) was the
exhaust and the outside pipe was the air intake. As the stove's
exhaust exited, it heated the incoming air for combustion. Sounds like
you have your circumstances "nailed down" just interested in your
opinion.


I'm real grateful for all the free and useful information on the net,
and I'm sure they publish their base or threshold value somewhere, so
generally speaking that is the way to go.

I interested in a variable base (or zone) numbers Example:

If I wanted to maintain 68°F daytime inside ambient but was willing to
let inside ambient drop to 60°F at night, while maintaining a "around
the clock" 74°F ambient in an attached green-house, the HDD would
change for each condition. I'm also interested in GDD, plus having all
the other data in TMY for reference seems worth the effort. Any way,
you know where to come for sub-set data or the whole thing if you play
databases.

Curbie



Posted by Jim Wilkins on April 21, 2009, 10:27 pm
 

That's called a Countercurrent Heat Exchanger, an efficient device
that can transfer considerably more than half the temperature
difference from the exiting to the entering air. They have been used
to increase ventilation of a tight house without losing much heat,
some even exchange humidity. I haven't seen one sold for wood stoves
and my installation of the chimney was strictly by-the-book, with more
nearby wood covered by steel than required. The fire inspector asked
me if I was a sheetmetal worker when he saw it.

I tried to design one for the dryer vent once, then decided to simply
hang the laundry outdoors.

I think the dangers of a creosote fire or CO leakage nullify any
efficiency advantage. Even stainless steel deteriorates, I have
several salvaged sections of old Metalbestos insulated chimney with
corroded and perforated inner liners, it might have been used for
coal. Here's one of the outer shells:
http://picasaweb.google.com/KB1DAL/Parts#5285937862376318882

Jim Wilkins

Posted by Tim Jackson on April 22, 2009, 8:59 am
 Jim Wilkins wrote:

That sounds like what we call a balanced flue, which is standard
equipment on domestic gas-fired boilers here.  Don't know about wood
burners, we finished our forests in the 16th century, and its illegal as
a fuel in our towns anyway.

Tim Jackson

Posted by Eeyore on April 22, 2009, 4:34 pm
 

Tim Jackson wrote:


Since when is it illegal to burn wood here ? No that many do.

Graham


Posted by Tim Jackson on April 22, 2009, 5:11 pm
 Eeyore wrote:

The Clean Air Act 1993 and its predecessors (1956 and 1968), subject to
smoke control orders made under those acts by local authorities. It is
illegal to use an unauthorised fuel within a smoke control area.  Wood
is not an authorised fuel.  Most urban areas are smoke control areas.

Tim

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