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September 2007
In late September 2007 we
installed an 18 foot round above ground pool in Las Vegas, Nevada.
This pool holds 7,000
gallons of water and is in full sun all day, no trees or shade. We
installed a Heat Siphon 3.25 SX pool
heater with a BTU output of
80,000 along with a Hayward 1/2 horse power water pump/filter
combo. This pump/filter combo
pushes about 45 gallons per
minute of water through the Heat Siphon on a scheduled timer which
runs from 8am to 7pm daily.
We have the heat pump set
to keep the pool at 82 degrees with a solar blanket on it most of
the time, especially at night.
The goal of our setup is to
see how well the heater works in desert climates with typical low
humidity conditions during the
Fall and Winter months in
Las Vegas. From October 1st through mid November, the average
daytime high temperatures have
been around 75 to 80 but
getting down to 47 to 55 at night. During the day, with full sun
and temperatures 75 + with the heater
running, the pool rises as
fast as 2.0 degree per hour. Part of this temperature rise is due
to the sun heating the water with
the solar blanket. I have
found that with just the blanket on the pool, with full sun at 75+,
the pool comes up 0.5 a degree per
hour on it's own with no
heater. In the late afternoon, around 3pm when the sun is getting
low in the sky, the sun does not have the same
effect on the solar blanket
and the pool temperatures stops increasing. With the heater
running at night and the blanket on
the pool, we can get a
steady 1.0 to 1.25 degree rise per hour even with air temperatures
down to 50 outside.
Notes by Jason Shiffrar Recorded Temperature Charts December 11, 2007 Turned on Heater at 12:05pm, no blanket 12-11-07 Las Vegas, Nevada. Put Blanket on pool at 10:00pm.
Turned off heater at midnight.
October 2, 2007
October 14, 2007
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