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Posted by dold on June 23, 2006, 9:37 pm
 
In alt.solar.thermal nicksanspam@ece.villanova.edu wrote:

My stubby little overhang shades the wall completely at noon today.  That
doesn't seem sufficient.  It actually looks like that might have been the
design, as the shadow is at the base of the wall at 1pm PDT.  That leaves a
lot of wall exposed to the afternoon sun.

Maybe I'd rather have an overhang for the 3pm sun.

http://www.eere.energy.gov/consumer/your_home/designing_remodeling/index.cfm/mytopic 280
says window sill on June 21 noon for my Moderate climate.

The Australian sites have more overhang, indicating 30% of window height as
an overhang, but I think that is at a latitude of 27.

Maybe a pergola, with winter-solstice angle on the boards.

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Clarence A Dold - Hidden Valley Lake, CA, USA  GPS: 38.8,-122.5

Posted by Rod Speed on June 23, 2006, 10:08 pm
 
dold@XReXXSolar.usenet.us.com wrote

http://www.eere.energy.gov/consumer/your_home/designing_remodeling/index.cfm/mytopic 280

Nope in the mid 30s latitude.



Posted by dold on June 24, 2006, 1:50 am
 
Australia stretchs from -12 to -38.  Maybe you are in the mid-30's.

I was referring to the site
http://www.greenhouse.gov.au/yourhome/technical/fs19.htm  
"For latitudes north of 27.50S the response varies with climate."

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Clarence A Dold - Hidden Valley Lake, CA, USA  GPS: 38.8,-122.5

Posted by Rod Speed on June 24, 2006, 2:35 am
 dold@XReXXSolar.usenet.us.com wrote

Yes, but the bulk of the population actually lives in the mid 30s.


Thats a different issue to what was being discussed,
whether its feasible to have an eaves that ensures that
no sun enters the house in summer, but does fine in winter.

You dont really need much solar heating at 27S except in
the inland and there arent many people living there at all.



Posted by Rod Speed on June 21, 2006, 9:52 pm
 dold@XReXXSolar.usenet.us.com wrote


I just used a properly sun angle calculator.

That was in the late 60s, bound to be plenty online now.


All you really need to do is ensure that the sun doesnt enter the
doors in summer, and set the eaves overhang to ensure that.


Its a lot simpler with windows/patio doors where you
just need to ensure that the sun doesnt enter in summer.



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