Posted by Stuart Gold on November 13, 2004, 10:41 pm
" There is another consideration if the thermal panel is an air
heater it helps not to have the rising hot air hit the cold front glazing"
I have gone and built the support for a tilted collector. Certainly, having
it vertical is easier but I really wanted to max out the effeciency. It's in
an area what is not seen and has plenty of room. I am a bit concerned though
about the issue that you brought up. I am using double wall polyarbonate, os
I imagine that it is somewhat protected. I wonder how much of the tilted
collector effeciencey is brought down to the specs of the vertical if the
temp of the glazing is taken into consideration.
Posted by Steve O'Hara-Smith on November 14, 2004, 8:14 am
On Sat, 13 Nov 2004 22:41:42 GMT
Hmm that's a complicated one to work out, it depends on how hot the
air gets inside the collector, how cold it is outside and the thermal
conductance of the glazing. You could do the math but it is likely to be
messy (especially allowing for the temperature gradients) or just measure
the effect. I'd measure it.
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Posted by nicksanspam on November 14, 2004, 12:06 pm
Introducing room air at the bottom, between a mesh collector and glazing,
and removing warmer air at the top, from behind the mesh, works better
with vertical vs tilted glazing.
Posted by James Baber on November 13, 2004, 9:48 pm
Stuart Gold wrote:
Jim Baber replies to Stuart
Yes it is, BUT, you and I are both seeking the best energy from the sun,
therefore the same angular optimization applies, and tracking does also although
I admit that is a lot more difficult for a thermal collector. I have seen
mirror arrays set to track and redirect solar energy to a fixed point (for solar
furnaces and boilers).
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Posted by Ken on November 13, 2004, 9:15 am