evacuated tubes vs. flate plates [RE-wrenches]

[Conrad Geyser]

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Hugh,
Thanks so much for that iltelligent observation.  Why are the Chinese so 
into evacuated tubes?  Is that low incidence gain of significant value?
The only other theory I can come up with.is that evacuated tubes use less 
copper (expensive) but more labor (cheap).
Conrad
Cotuit Solar
----- Original Message ----- 
From: "Hugh Piggott" <hugh at scoraigwind.co.uk>
To: <RE-wrenches at topica.com>
Sent: Tuesday, November 20, 2007 3:39 AM
Subject: Re: evacuated tubes vs. flate plates [RE-wrenches]


>
>>>  ETs are inherently more intricate, delicate and complicated.  They are 
>>> the Porsche and the FPs are the Toyota.
>
> I recently installed some chinese evac tubes on my own roof.  I am very 
> pleased with the output and the price was not bad, but I don't have much 
> experience of solar HW.  I do wonder how long they will last.
>
> What I was going to say was, I read in a recent edition of Renewable 
> Energy World, that most solar HW in the world is actually evac tube and 
> the reason is that the vast majority of Chinese solar HW uses them.  Not 
> so common elsewhere, but china has by far most of the installed capacity 
> of solar thermal systems.
>
> So I guess they are more than a gimmick if they have most of the market 
> already.
> -- 
> Hugh Piggott
>
> Scoraig Wind Electric
>
> http://www.scoraigwind.co.uk
>
>
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