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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Today's Featured Article - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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