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evacuated tube vs. flat plate collectors

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Posted by Steve Krug on August 8, 2003, 2:46 pm
Anyone know of any side by side comparisons in different climates?

Steve Krug
Designer of Engineering Systems
S & K Design and Services

Posted by ragno nero on August 8, 2003, 4:42 pm
here you can try the best test on the web:


Posted by andy on August 9, 2003, 7:29 pm
 The SPF has ALL the information you need to make informed comparisons.
Here is some analysis I put together from SPF data:
http://www.thermalstar.ca/techtalk.html  (website in progress - please
ignor any commercial content)

Posted by ragno nero on August 11, 2003, 7:13 am
 ...but I can say that the difference is more that in the test

Posted by andy on August 11, 2003, 2:34 pm
 The "exact difference" for any application depends on many variables.
You have to run some kind of time domain simulation to get these
numbers eg. TRANSYS or an Excel Spread Sheet with weather data and the
second order efficiency curve data for the given colelctors. What you
shouldn't do is compare efficiencies at 1KW/m^2 as this is not where
the collectors spend their useful time. In my experience doing a
comparison at 400W/m^2 gets you almost all of the way there.

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