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Re: testing pool solar panels - Page 2

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Posted by nicksanspam on June 9, 2007, 2:05 pm
 


Silly people in Florida heat their pools with outdoor heat pumps :-)
Smarter ones use AC waste heat.


You expect people to spoon-feed you? :-)


Perhaps you can lower one long edge to tilt the stand towards the south.


Sounds Sol-R-Roll or EZ-Heat. You may find lots of black dust in the water
and a few broken tubes next spring.


Yes, tho returns diminish with more pump power.

How about a clear solar pool cover?

Nick


Posted by gfretwell on June 9, 2007, 4:47 pm
 
On 9 Jun 2007 10:05:56 -0400, nicksanspam@ece.villanova.edu wrote:


Why would anyone need to heat a pool if the AC was on?


Posted by nicksanspam on June 9, 2007, 6:17 pm
 

Silly, with a COP = 3 compared to solar pool heating with a COP = 3000.


Another Small Matter of Physics (SMOP.) Consider Jacksonville in June,
with a 79.3 average temp and a 89.3 F daily max and a humidity ratio
wo = 0.0157 and vapor pressure Pa = 29.921/(0.62198/wo+1) = 0.737 "Hg,
vs Pw = e^(17.863-9621/(460+75)) = 0.887 for 75 F pool water at 100% RH.

ASHRAE says a 30'x40' uncovered pool would lose 24hx30x40x100(Pw-Pa)
= 433K Btu/day, like a poorly-insulated McMansion with a 1000 kWh/mo
indoor electric bill and a 1400 Btu/h-F thermal conductance to outdoors.

Nick


Posted by gfretwell on June 9, 2007, 7:08 pm
 On 9 Jun 2007 14:17:21 -0400, nicksanspam@ece.villanova.edu wrote:


It is a lot easier and cheaperr in the long run to just use solar
collectors. That magic month where the A/C is on and the pool is still
too cool will not pay for connecting up a heat recovery system.
I bet there are still people in Jax who don't have the AC on yet. I am
only using mine intermittantly in Ft Myers/Naples and my solars are
shut off already.

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