26 Aug '17, 3pm

An Experimental Trickle Down Solar Water Heating System:

I'll offer a caution on the twinwall polycarbonate glazing. I agree with Lu that the twinwall is great stuff to work with and the double glazing is a particular benefit on the Thomason style collectors. But, General Electric (one of the makers of twinwall polycarbonate) advises against using it when it will be in contact with hot water vapor. The tests they ran with this condition showed a significant drop in material properties over a not very long period. It may be that they were using hotter water vapor than will be present in this collector, and that the life of the twinwall on this collector will be OK. Lu can let us know in a while whether he is seeing any degradation.

Full article: http://www.builditsolar.com/Projects/WaterHeating/LuThoma...

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