evacuated tubes vs. flate plates [RE-wrenches]

Tom Lane tom at ecs-solar.com
Wed Nov 21 06:01:08 PST 2007


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ET's will not perform any better than flat plates when mounted vertically on 
a wall - which is a bad idea any way for summer performance.  The one 
situation that is unique to ET's when raised up on a flat roof or elevated 
up at high angles or south facing roofs during summer in the early morning 
and late afternoon - the back side can capture significant solar 
insolation - which is another reason DC pumps with PV modules as a pumping 
and control system IS NOT recommended with ET's.

Gatortom

----- Original Message ----- 
From: "Howie Michaelson" <howie at suncatchervt.com>
To: <RE-wrenches at topica.com>
Sent: Tuesday, November 20, 2007 2:09 PM
Subject: Re: evacuated tubes vs. flate plates [RE-wrenches]



Thanks Tom,

I was wondering if we were going to hear from you on this one...

Do you have any data on comparisons of FP vs. ET collectors when mounted
at a high angle of incidence (ie near vertical)?  Or know where some
reliable data might be foraged?  My client is interested in a near
vertical mounting if it isn't too inefficient.

And does anyone have any hard data as to the durability of various ET's?
(sorry for repeating this question - I just haven't found any references
to this kind of data anywhere, but many have suggested that ET's have a
shorter lifespan.

Thanks,
Howie


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