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large swimming pool - solar thermal system sizing

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Posted by nospam on January 7, 2008, 4:41 am

Thanks for making this Google Group available! I'm helping with sizing
a solar pool heating system for a large public pool in the Atlanta,
Georgia area. The surface area is approximately 12950 sq.ft. and
holds approximately 450,000 gallons of water. They have a building
adjacent to the pool with a west-facing roof that will accommodate
1900 sq.ft. of collectors.

We're looking at putting 18 4x12x2 and 18 4x14x2 collectors on the
roof. They are the Solar Industries brand. The pool had no heat
previously and could be used for 3 months out of the year at a
comfortable 80-85 degrees F. (June,July,August) Their hope is to
extend the season to about another 1-2 months and are looking for a
temperature lift of 6-10 degrees F. Also, during the hottest days of
the summer, they hope to run the system at night to cool down the pool
by 5-7 degrees. Due to the size of the pool, covering it at night is
not an option.

My concern is that with the volume of water in the pool, will we even
make a dent in the temperature with the current sq. footage of
collectors? We have access to the eastern side of the roof as well
but due to nearby trees, it won't double the peak hours of sun.

Thanks for any guidance you can give,


Posted by Steve O'Hara-Smith on January 7, 2008, 7:30 am
On Sun, 6 Jan 2008 20:41:54 -0800 (PST)
nospam@southerngrease.com wrote:

    It's a USENET group not a Google group, Google just provides a poor
interface to USENET.

    I think you'll find that's far too small an area. It is common to
use somewhere in the region of 50%-100% of the pool area in collector area
for pool heating.

    It is a pity that covering it is not an option - that's usually the
first big win.

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Posted by J. Clarke on January 7, 2008, 12:10 pm
 nospam@southerngrease.com wrote:

This is a project of sufficient size that you really should be getting
professional advice.  The volume of water per se isn't the issue, the
issue is how much heat it loses or gains in a given time period.  Have
you called the Mechanical Engineering Department at Georgia Tech for
advice and referral?  If not you might want to.

to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)

Posted by Ed on January 8, 2008, 12:17 am
 for the cheaper black plastic, we use 100% surface area to collector
area here in FL for a 10 degree diff.   LEss for the $$$$  vacuum
collectors.    Also depends on wind, shade, useage, etc.    Good
suggestion to get  the rambling wrecks to take a look.

J. Clarke wrote:

Posted by David W on January 9, 2008, 7:10 pm
 On Sun, 6 Jan 2008 20:41:54 -0800 (PST), nospam@southerngrease.com wrote:

Why so? There are many inexpensive manual and automatic "roller" systems
that work quite well. You're going to find that without covering, the
amount of PV sq ft you're going to need to keep pool temps at even the most
minimum comfort will be as much as 2x the flat area of the pool. Further,
you can kiss goodbye most any of the late Fall thru early or late Spring

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