Posted by willie in mn on November 09, 2012 at 01:42:53 from (67.142.168.27):
In Reply to: The Swedes are here posted by rrlund on November 08, 2012 at 16:55:25:
I have been known to be a skeptic, & even wrong many times. Not doubting his sincerity, but I have trouble with some of the numbers. From Physics 101- water at atmospheric pressure boils at 212F. No matter how much heat energy is added, it will turn to steam & not get hotter than that point without adding pressure. Steam will not get any hotter by adding heat energy either without adding pressure, it will just boil off faster. Adding pressure raises the boiling point 3 deg per lb pressure. To get 350F requires 414 psi. What does the system use to get that much pressure? 7 meters of tubing is only a tad over 23 feet. Hard to imagine large heat transfer from that amount of tubing. Is there a pump to circulate heated water from the solar panels to the storage tanks? Thermo-siphon wouldn't work as the hotter water would rise to top of solar panels. What is room air temp during heating season. I admit the steady/constant temp of hot water radiant heat in the floor is the most comfortable. Will stop here, getting too long Willie
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