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selective coating versus stove paint/ any benefit? - Page 2

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Posted by gosolar23 on October 18, 2005, 12:25 am

How the heck is Energie Solaire doing it?

www.energie-solaire.com   They have an unglazed collector that they
advocate for places like seattle.    I discussed this with them at
length I got an estimate for $4k USD.  This was unglazed and what they
recommended.  Nick thinks its swell as well.

It is really mild here in the winter.  Rare are days below 40 deg F.
The pacific ocean is in the 50's and are average temp 8 month a year
must be above 60 deg during the day.

We can have lots of clouds Nov-March.  I could glaze this collector
easily as well.  I am interested in your thoughts.



Posted by Rob Dekker on October 18, 2005, 2:17 am

Well, I'm really not that much of an expert, so who am I to argue with these
reputable sources.
But it seems to me that it is futile to try and heat water to 120F without
glazing if it is 40's or 50's or 60's outside. You would just kill off the
efficiency I would think.
Unless you are using a heat pump, or low water temp (like you need for a
swimming pool or so).

What is the temperature you want the water to reach ?

Which product did you intend to buy from Solaire ? The solar roof ?

I'm looking through their data sheet and they have some efficiency
calculations there. They only seem to deal with radiation losses though.
Not with convection losses.

I'd be happy to look into convection losses a bit more, but maybe
somebody with more experience could help out..

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