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GSBN:double pane windows

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Hi Kelly.
The double single pane windows shouldn't be dropped too
quickly--I have seen them used very effectively in the US and Canada
and my parents home in Colo uses them. They are simple, cheap and can
be cleaned - as I recall some modelling suggested 2-5 cm as optimum
but losses from internal convection would be low even at 20 cm. An
insulated shutter or curtain could also be stuffed into the space in
some cases for windows not used in winter.
PS _ Look for Fast Runner - an Inuit film. Excellent!
<blockquote type="cite" cite>
<blockquote type="cite" cite>Hi All, 
<blockquote type="cite" cite>Thanks for all the thoughts and ideas on
the higher humidity in straw-bale houses than in brick houses. To
expand on what Paul said, there are three typical heating systems and
they are found in both brick houses and straw-bale houses, all
1. Kangs - raised masonry bed platforms, about 3m x 4m, heated by hot
flue gases traveling from the kitchen to the chimney. 
2. "Fire walls" - brick cavity walls, heated by hot flue
gasses traveling from the kitchen to the chimney 
3. Hydronic radiator systems that work on the natural flow of hot
water and gravity 
Almost every house has a kang, some have firewalls and very few have
radiators. The fire which heats the kang and firewall comes from the
kitchen cooking stove (in the next room on an adjacent wall). It
consists of hollow brick box on the floor on an interior corner,
about 1m x 1.5m x 0.4m high. It has one or two round openings on the
top (for a wok) and an opening 15cm w x 20 cm high on the side
through which the fire is fed. The whole system is a like a masonry
stove, but<b> not</b> air tight. Sometimes the kang has a small air
damper in front, but not always, it seems to depend on the size of
the system. I'm always amazed that these systems draw well, but
there's rarely any dark smoke marks on the ceilings. Crop residue is
generally used as fuel for cooking (rather than coal) and as owners
get used to their straw-bale houses they're generally heating
primarily with cooking fires (more crop residue and less coal). This
is especially true during a warm winter like last year. 
The water for the radiator systems is heated by coal in a metal
firebox. Most folks are finding that with the high insulation
provided by straw-bale, they don't need a radiator system (which is
good as it is relative expensive). 
The window and doors are the same for brick and straw-bale houses .
Windows a double set of single pane windows, about 20-25cm apart,
usually in-swinging casements. Double pane vinyl windows are becoming
available in more developed regions and some owners use them, but
we've had reports that they don't perform as well as the double,
single pane style (in spite of all the convective currents in the
wide air space). Double solid doors - one in-swinging and one
out-swinging. Most houses are designed with an unheated entryway that
acts as a buffering "airlock" between the outside and
heated interior rooms. Neither brick houses or straw-bale houses are
air tight which is good since their heating systems need combustion
After hearing your comments and thinking them through, it seems there
are at least four explanations for the drier air in brick houses
(arranged in order from greatest effect to least effect). 
1. Because brick houses burn more fuel, they draw in more dry outside
air thereby lowering the indoor RH. 
2.The cold interior surface temperature of exterior brick walls,
condenses water out of the interior air, thereby lowering indoor
3. Straw-bale houses in the study, by virtue of their younger age,
may be slightly more airtight than brick houses in the study. 
4. Since half the straw-bale houses in the study were completed in
the fall just before study began, the new plaster harbored
significant moisture that tempered the interior RH to some degree
throughout the winter. (a one time effect, but since the sample is so
small, 12 SBH and 12 BH, it could skew the data significantly). I
will have CESTT look at the RH in the new SBH compared to the old SBH
and also if the interior RH in the decreased i the new SBH over the
course of the winter.</blockquote>
<blockquote type="cite" cite> 
Thanks for reminding me about dry, cold winter air! Living as I do
now in the balmy bay area, I forget about my childhood winters
scooting around the carpet with wool socks to make hair raising
sparks and filling the kettle on the back of the wood burner every
night before bed. 
<blockquote type="cite" cite> 
<blockquote type="cite" cite> </blockquote>
<blockquote type="cite" cite>Kelly Lerner 
One World Design 

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David Bainbridge 
Environmental Studies Coordinator 
GLS Department</font>
<font color="#000000">Alliant International University 
10455 Pomerado Road 
San Diego, CA 92131 
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Ph (858) 635-4616</font>
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