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Solar water heating system.. - Page 8

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Posted by Robert Gammon on June 21, 2006, 12:40 pm
digitalmaster wrote:

The rub to this argument is - more HOURS of daylight in the summer.
This fact coupled with higher outside temps, WILL MAKE A HOUSE WITH

Posted by Derek Broughton on June 21, 2006, 1:18 pm
Robert Gammon wrote:

Please don't yell.  It's completely unnecessary.  It's not hard to make the
south facing windows work.  You need overhangs, as pointed out, but the
angle of incidence, along with the right kind of glazing makes it entirely
possible to restrict heat gain.  In Northern latitudes, what may be much
worse for causing overheating is large glass expanses in West windows.
West windows get little to no heat gain in Winter, but can't be shaded by
overhangs in Summer.  I've got lots of south window, but it never gets hot
in the living room until the sun starts to set.

Posted by Mary Fisher on June 21, 2006, 4:01 pm

The problem with that is that it cuts down light too. I prefer to shade with
curtains, which are movable.


Posted by Derek Broughton on June 21, 2006, 9:02 pm
 Mary Fisher wrote:

They are - but the heat is already _inside_ by the time the light hits your
curtains, so you have potentially lost the battle already.

Posted by Mary Fisher on June 21, 2006, 9:31 pm

No it isn't! If our south facing room is hot because the sun is shining in
and I draw a curtain it cools perceptively and immediately :-)

I've done it lots of times. The curtain has to be lightproof of course,
which can cut down the light but it only has to shade that sunlight which is
shining directly into the room.

Thus, when Spouse and I are having breakfast in the bay window of our south
facing dining room and the sun's rays are hot we close the curtain behind
him in the morning to prevent the south eastern rays coming in and the one
behind me in the afternoon to shield those from the south west. At lunch
time, for a very short period, we have to close both. The answer would be to
have a curtain which would just cover the immediate south facing pane but we
can't be bothered :-)

I was once fascinated because on a very hot day the bees in a hive in full
sun were flying in a cloud at the front of the hive. I leaned a large slab
of stone against the side of the hive where the sun's rays were striking and
the bees all went inside and behaved normally from then on. How they knew
that the hive had cooled was another matter but my observation was that the
effect was immediate.


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