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re: shading sunspace ceiling/roof - inside vs outside?
6 jun 2005
loren amelang wrote:
>the sunspace is not used as living space during really hot weather,
it might be nice to have that ability. given the concrete, you might
vent it at night and keep it shaded with no venting during the day.
>>...as an aside, putting concrete in a sunspace used for heating
>>seems inefficient to me.
>...for a totally passive heat gain system, the concrete wall has been
>quite satisfactory... there is already plenty of heat on any sunny
>winter day, and it lasts well through the night.
that's another way of saying it loses lots of heat at night through
the glazing and tends to be lukewarm all winter, vs a low-thermal mass
sunspace that makes hot air that flows through the house during the day
and gets cold at night when the airflow stops and it loses little heat
back out through the glazing.
>>for summer shading, you might be ok with aluminized (low-e) shadecloth
>>under the glazing.
another solution would be to paint the top of the glass. greenhouse
suppliers sell permanent whitewash as well as spray-on solutions that
can be washed or weathered-off over time.
nick
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