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re: solar heat absorbing rubber matts...
15 feb 2000
gigawatt wrote:
>there are black rubber type office matts... that you can
>put into the pool... they sink to the bottom and when the
>sun is out... they absorb sunlight and heat up the water..
good idea, but the cover is still the key, no? solar pool heating
without a good insulating cover is like bailing a bottomless boat.
just got hc bryant and ian colbeck's paper, "a solar pond for london,"
(solar energy, v. 19, p 321-322), which says the fraction of incident
energy _remaining_ after passing through x meters of water (x varies
from 1 cm to 10 m) is 0.73-0.08ln(x), eg 0.73 after 1 meter.
so it appears that black bottoms will help a lot in pools less than
say, 10 meters deep.
nick
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