solar pre heat for pools [RE-wrenches]

[Dean T. Newberry]

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Hi y'All,
Daryl is right poly pipe is nearly identical to PEX, the same applies. 
The breakdown occurs faster at higher temperatures and chlorine 
concentrations, check with your tubing supplier. Qest and Wirsbo both 
have papers on the subject.  The Radiant Panel Association (RPA) has 
guidelines on tubing circuit design. Flat Plate makes pool water heat 
exchangers. These systems are used for snow and ice melt as well as pool 
slab cooling / pool heating and of course warm floors.  Old solar farts 
drifted off into hydronics and radiant heating/cooling when the solar 
tax credits went away in the 70's which is where this information comes 
from. I suppose solar electric farts will become electricians and 
stationary engineeers when this round of rebates fades out. And of 
course some of us will become inverter service technicians.

Darryl Thayer wrote:

>I think these ideas are great, but I did not know that
>clorine attacks PEX if it does then it should attack
>poly pipe which is just a lower density polyethylene. 
>I will try to look into it, anyone know for sure?  
>Daryl
>
>--- David Blittersdorf <davidb at nrgsystems.com> wrote:
>  
>
>>I installed 300' of 1.5" diameter black poly pipe in
>>the 4' concrete decking 
>>around my 44' x 18' pool (2 loops) and plumbed it
>>directly to the output of 
>>my pump. I also installed 3 used American Solar King
>>collectors on my 
>>pool shed roof and also insulated the steel walls of
>>the pool down 4' with 
>>2" blue board. 
>>
>>The pool pump is a varible speed motor drive that is
>>controlled by a 1 
>>watt PV panel. The pump automatically turns on with
>>the sun and speeds 
>>up the brighter the sun shines and therefore more
>>flow to the tubing and 
>>collectors w/o valves and other controls.
>>
>>It works well even here in the cool northeast
>>(Vermont). Yesterday the 
>>pool was 78 degrees after cooling down from 85-90 F
>>which it held all 
>>summer. Last night it was 40 F outside. Solar covers
>>are required to hold 
>>in the heat at night.
>>
>>Regards,
>>
>>David Blittersdorf
>>
>>On 8 Sep 2003 at 9:41, Dean T. Newberry wrote:
>>
>>    
>>
>>>A friend of mine put PEX tubing in the slab to
>>>      
>>>
>>cool the deck at George
>>    
>>
>>>Lucas home many years ago, The technology is well
>>>      
>>>
>>worked out, but the
>>    
>>
>>>chlorine attacks the PEX and copper. Use a pool
>>>      
>>>
>>water heat exchanger and
>>    
>>
>>>propylene glycol loop with expansion tank and air
>>>      
>>>
>>scoop in the deck
>>    
>>
>>>cooler circuit. Use the radiant floor standards
>>>      
>>>
>>for layout and circuit
>>    
>>
>>>sizing.
>>>
>>>-----Original Message-----
>>>From: Darryl Thayer [mailto:daryl_solar at yahoo.com]
>>>      
>>>
>>>Sent: Sunday, September 07, 2003 10:07 PM
>>>To: RE-wrenches at topica.com
>>>Subject: Re: solar pre heat for pools
>>>      
>>>
>>[RE-wrenches]
>>    
>>
>>>Yes i have ttried something like that, I recieved
>>>solar heat, just not very much compared to solar
>>>panels. 
>>>Daryl
>>>--- keith <kcronin at lava.net> wrote:
>>>      
>>>
>>>>Hello
>>>>
>>>> 
>>>>
>>>>I had a thought this weekend, and wondered if it
>>>>        
>>>>
>>was
>>    
>>
>>>>applicable or if
>>>>anyone has pursued this concept.  People who
>>>>        
>>>>
>>have
>>    
>>
>>>>pools are accustomed
>>>>to putting those black solar pool panels on
>>>>        
>>>>
>>their
>>    
>>
>>>>roofs.
>>>>
>>>>Has anyone ever considered during the initial
>>>>        
>>>>
>>phases
>>    
>>
>>>>of pool
>>>>construction, to install radiant floor, plastic
>>>>tubing in the
>>>>concrete/tile/stone around the pool deck area
>>>>        
>>>>
>>for
>>    
>>
>>>>the same purpose?
>>>>
>>>>I just thought we could make the panels less
>>>>unaesthetically (a word?)
>>>>pleasing and I always know that those darn pool
>>>>decks get very hot to
>>>>the bottoms of my feet!
>>>>
>>>> 
>>>>
>>>>My thoughts on a Sunday!
>>>>
>>>> 
>>>>
>>>>Thanks for the feedback
>>>>
>>>> 
>>>>
>>>>aloha
>>>>
>>>> 
>>>>
>>>>Keith Cronin
>>>>
>>>>President
>>>>
>>>>Island Energy Solutions
>>>>
>>>>318A Kuulei Rd
>>>>
>>>>Kailua, HI 96734
>>>>
>>>>808-262-3268 Tel
>>>>
>>>>808-263-0338 Fax
>>>>
>>>>www.islandenergy.net
>>>>
>>>> 
>>>>
>>>> 
>>>>
>>>>
>>>>[Non-text portions of this message have been
>>>>removed]
>>>>
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>>>      
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>>David Blittersdorf
>>NRG Systems, Inc.
>>110 Commerce Street
>>Hinesburg, VT 05461 USA
>>Tel: 802-482-2255
>>Fax: 802-482-2272
>>email: davidb at nrgsystems.com
>>Web:http://www.nrgsystems.com
>>
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