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most efficient collector for solar water heating - Page 3

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Posted by Morris Dovey on December 23, 2008, 3:12 pm
 
codechump@gmail.com wrote:

In general, a flat collector will deliver more usable heat than a same
size parabolic trough.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/

Posted by azuredu on December 24, 2008, 6:30 am
 
On Dec 24, 5:33 am, david.willi...@bayman.org (David Williams) wrote:

It is the radiation of the sun that is weaker, with less energy. Due
to a longer distance the light has to travel thru the atmosphere,
therefore more absorptions and so on.

Posted by codechump on December 24, 2008, 1:28 pm
 
In terms of your parabolic curve, are you choosing to have a curve
where the receiver is on the the same plane as the top edges of the
curve, that is to say if you placed a large enough flat ruler across
the assembly it would touch the the two edges of the curve and the
receiver, for performance or convenience reasons?

I have seen designs with a more open curve, such as the one in this
link:http://dvice.com/archives/2008/08/solar_icemaker.php

Posted by azuredu on December 24, 2008, 3:40 pm
 On Dec 24, 4:53 pm, david.willi...@bayman.org (David Williams) wrote:


Even on a clearest day, the atmosphere absorbs at least 20% of the
radiation reaching it when the sun is at zenith. This absorption rate
increases rapidly when the sun is near horizon.



Posted by RF on December 24, 2008, 9:02 pm
 I haven't seen any mention of a sun tracker,
though I may have missed it.
I guess it would be necessary, unless you have a
slave constantly moving
the reflector.

What would they cost, including motors?

 From the discussion it appears that the parabola
is more cost effective for water heating. How
would they compare for space heating?

azuredu wrote:


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