underground piping [RE-wrenches]
Tom Lane, Energy Conservation Services
tom at ecs-solar.com
Thu Jun 27 08:07:31 PDT 2002
The supply temperature from Flat Plate solar collectors does not exceed the temperature of Rubbatex. (It is used it in the HVAC industry at higher temperatures than flat plate collectors will create.) It does not get brittle and easily damaged unless it is unprotected and exposed to sunlight. Simply, encase rubbatex over copper pipe in schedule 20 PVC or ABS foam core pipe. You will need higher temperature insulation for evacuated tube collectors especially for flow after stagnation. Evacuated tube collectors are unnecessary anywhere in the USA until temperatures over 180 summer or 165 winter are needed. Flat plate collectors outperformed these expensive collectors as long as the temperature stays lower than the above noted. I wish solar electric contractors who think these tubes are sexy would learn what y intercept of 0.73 and a slope of -1.0 efficiency curve means.
-Gator Tom
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