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Payback and Algae Questions re Solar Pool Heating

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Posted by donhdoyle@yahoo.com on January 8, 2007, 6:56 pm
 
we are installing a back yard pool in Columbia SC.  We have nearly
perfect southern exposure with very few obstructions and plenty of
space on a new garage with a south slanting roof for the panels.
I'm getting a set of Heliocol panels installed, I believe it is 7 4 x
10 panels, enough to supply 70 pct of our heating needs according to
the installer.  It will cost $500.

The pool builder told me it would cost that much for a gas heater and
about $00 or more per month to run it, depending on the season.

The payback on this is immediate in other words.  Am I right?
My question is: why is solar thermal pool heating so rare around here?

My pool builder also warned me that one solar system she worked with
produced algae because, according to her theory, the water sat in the
pipes up on the roof and produced algae.  Doesn't algae need sunlight?
 Is this a problem I should worry about?

Meanwhile, I'm looking forward to my new warm pool.

--Don


Posted by donhdoyle@yahoo.com on January 8, 2007, 6:56 pm
 
we are installing a back yard pool in Columbia SC.  We have nearly
perfect southern exposure with very few obstructions and plenty of
space on a new garage with a south slanting roof for the panels.
I'm getting a set of Heliocol panels installed, I believe it is 7 4 x
10 panels, enough to supply 70 pct of our heating needs according to
the installer.  It will cost $500.

The pool builder told me it would cost that much for a gas heater and
about $00 or more per month to run it, depending on the season.

The payback on this is immediate in other words.  Am I right?
My question is: why is solar thermal pool heating so rare around here?

My pool builder also warned me that one solar system she worked with
produced algae because, according to her theory, the water sat in the
pipes up on the roof and produced algae.  Doesn't algae need sunlight?
 Is this a problem I should worry about?

Meanwhile, I'm looking forward to my new warm pool.

--Don


Posted by Jeff on January 9, 2007, 6:24 am
 donhdoyle@yahoo.com wrote:


  Well I was hoping someone else would get this started as my knowledge
is limited!

   It's odd but solar in this country, particularly in areas where it is
most feasable is often rare. You'll probably find more pool heaters in
Canada than in the states.

   I think your one year payback will most likely be two or three years.
I'd invest in a pool cover, if you don't already have one. Conservation
usually has the best payback. If Nick is around, he can give you some
info on losses.

Perhaps related to how hot the water is heated. Solar works best under
lower temperature rises, not quite hot enough to kill algae outright.

   Jeff



Posted by Morris Dovey on January 9, 2007, 1:20 pm
 Jeff wrote:
| donhdoyle@yahoo.com wrote:

|| My pool builder also warned me that one solar system she worked
|| with produced algae because, according to her theory, the water
|| sat in the pipes up on the roof and produced algae.  Doesn't algae
|| need sunlight?
|
| Perhaps related to how hot the water is heated. Solar works best
| under lower temperature rises, not quite hot enough to kill algae
| outright.

Does all the water in the system need to be raised simultaneously
above an algae-killing threshold; or would it be sufficient to pass
the water through a  solar heater that raised the temperature of the
water above that threshold as it passed through?

If the latter is sufficient, then a (relatively) small solar trough
might be able to get the job done...

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/SolarEnergy.html



Posted by Jeff on January 9, 2007, 2:23 pm
 Morris Dovey wrote:

   I don't know whether algae can be killed by high temperatures. I
remember us talking about using high temperature to kill bacteria.

   All I can really find out is that algae is killed or discouraged by
low temperature, below 50 F. Solar can effectively keep a pool above
this temp, whereas with more expensive heating you may let the temp drop
when you are not using the pool.

   I think there is probably an easier way to kill algae than heating
it, and you can treat my remarks as probably mistaken conjecture.

   Still, I like the trough idea! Probably not for pools though.

   Jeff


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