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solar pool cover for kidney-shaped pool - Page 2

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Posted by dold on November 9, 2006, 6:47 pm
In alt.solar.thermal nicksanspam@ece.villanova.edu wrote:

Clear is better?  Why are most of them blue then, just appearance?

Cut it to fit the kidney.  When you get ready to roll it up, flip the
excess part onto the main part, and roll.  Don't drag it around the bulge,
and don't leave a big area of uncovered water.

I would definitely get a reel, if the cover is too large to handle easily
by yourself.  Our 12x32 cover was a chore to take off and put on.  It's no
big deal with the reel.  We have one area that sticks out, and I just fold
that in before I reel it up.

The portion of the cover that is not in contact with water would overheat
and ruin the bubbles.

Clarence A Dold - Hidden Valley Lake, CA, USA  GPS: 38.8,-122.5

Posted by nicksanspam on November 9, 2006, 8:58 pm

Yeah. Dumb.

Maybe you missed the part about pumping water over the bottom cover,
or you don't know that polyethylene film is transparent to UV,
which limits the max temp.


Posted by dold on November 10, 2006, 10:53 pm
 In alt.solar.thermal nicksanspam@ece.villanova.edu wrote:

I did miss the construction of this two cover arrangement.  Describe that
in a little more detail, if you don't mind.

The cover seems to be damaged by exposure to the sun in a short period of
time.  The covers come with opaque white sheets that are supposed to be put
over the cover when it is off the pool.  The little bubbles seem to
overheat and distort.  

Clarence A Dold - Hidden Valley Lake, CA, USA  GPS: 38.8,-122.5

Posted by Don Phillipson on November 9, 2006, 4:27 pm

http://www.eere.energy.gov/consumer/your_home/water_heating/index.cfm/mytopic 140).

Thermal insulation is the main function of a "solar blanket."
Evaporation occurs mainly in direct sunlight.

1.  The cheaper solar blankets do not last long, 4 to 7
years, before the plastic developes holes.
2.  Friction damage is reduced by (a) storing the blanket
on a roller, (b) elevating the roller a foot higher than
the rim of the pool.

1.  Float the blanket on the water.
2.  Decide how to fasten the blanket to the roller,
i.e. position the roller conveniently and measure
how long the various straps should be.  There
should be a strap or connector every three feet or so.
3.  Secure the blanket to the roller and confirm that
it the roller spools up freely.  The lumpier it is, the
more height you will need;  but the blanket will roll
up smoothly when excess material is removed and
the lengths of the straps are exact.
4.  Float the blanket on the water and cut off the
excess, to fit the pool.

Don Phillipson
Carlsbad Springs
(Ottawa, Canada)

Posted by maxwell on November 9, 2006, 6:00 pm
Don Phillipson wrote:

FWIW, from my observation it occurs when the water is warmer than the
air, including at night.  It's obvious in the early morning, when the
sun's rays are nearly horizontal, and I can see the mist rising up.
The humidity of the air is probably a factor, too--I suppose the
evaporation is more obvious when the air is humid, but occurs at least
as much (maybe more) when the air is dry.

The lumpier what is?  I guess you mean that if the blanket isn't
rectangular, the rolled up blanket will have "troughs" where parts have
been cut away?

Thanks for the tips!

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