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re: swimming pool solar heaters (what we need is a good cheap collector.........)
20 may 2000
lutz wrote:
>i can only jeff (jeff & teri) and zams (kamilla) agree: 50
>meters x 25mm are never 12 qms... 50ms x 0,025ms = 1,25 qms!!
yup. 50m x 25mm = 1.25 m^2. i missed the start of this portugish
(engugese?) thread, but it still seems to me that a good insulating
cover (us r20 or metric r4) is the key to swimming pool heating.
without that, heating a pool is like bailing a bottomless boat.
>no, i think, the second-best method, to heat your pool, are with
>your existing 8 collectors. the first-best method, are the
>swimming pool-collectors, which i am selling and have installed
>2.500 qms in the last 4 years here in brazil...
would you have any tiny bias in that direction? :-)
how about flooding a dark colored concrete pool coping
from a perimeter pipe with some holes in it?
>a collector has 1 qms and costs at são paulo or munich
>us$80 fob with all assembly-accessories...
hmmm, $7.40 per square foot plus shipping from say, sao paolo,
versus $0.14 per square foot for a solar cover with a 5 year
guarantee--53 times cheaper.
can't those good german engineers come up with a metric r2 solar cover
that's easy to slide off the pool? something like a large plastic film
jellyfish, a flat translucent titanic, or a collection of intelligent
"coverites" (us patent no. 4,467,786, issued 8/28/84), plastic baggies
filled with soap bubble foam at night and air during the day that sink
to the bottom for swimming.
nick
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