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- CommentAuthorjon
- CommentTimeFeb 10th 2009
More than 50% of radiation (one of the two polarities) would be reflected past brewsters angle, which is about 60 degrees, so you could arrange your glass at an angle, or a series of reflected planes or etches.
Sounds expensive though -
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CommentAuthorfostertom
- CommentTimeFeb 10th 2009 edited
Thanks to Mark Siddall on http://www.aecb.net/forum/index.php?topic=1737.0 , this superb primer - everything about windows http://www.aecb.net/PDFs/conference08/AECB%2020window%2020seminar%20209-6-08[1]_PDF2.pdf
On p13, a v interesting chart shows that solar gain thro S glass peaks March and Oct and drops to half that in mid summer!Presumably, as jon hints above because in summer the angle of incidence causes reflection. Now that surprises me. E and W peak as expected in mid summer. If SE and SW are halfway between, suggests a very 'flat' and unpeaky gain over most of the year! -
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- CommentAuthorralphd
- CommentTimeFeb 11th 2009
Tom,
The roll-away 2.4m glass wall (look like what we call patio doors on this side of the pond) may cost you more in heat loss from air infiltration than their net solar gain. I don't see much opportunity for tight weatherstripping in the picture you posted.
-Ralph -
- CommentAuthorralphd
- CommentTimeFeb 11th 2009
Posted By: fostertom[...]in summer the angle of incidence causes reflection.
A good (but before my time) CBD that relates to this topic:
http://irc.nrc-cnrc.gc.ca/pubs/cbd/cbd039_e.html -
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CommentAuthorfostertom
- CommentTimeFeb 11th 2009
Posted By: ralphd... (what we call patio doors on this side of the pond) may cost you more in heat loss from air infiltration
We say Paddy O'Doors. Airtightness - good point. They drop bodily onto the bottom frame/track when locked - you have to swing the long lever handles to jack them back up before opening. All the vertical edges get pulled tight together where they 'hook' over each other, by the pull of the leading leaf's closing bolts. That leaves the top edges - presumably a sliding seal. All to be checked. -
