[RE-wrenches] Heat Exchangers Topic for Swimming Pools

[Jay]

Hi Tom

Is your doubling of the HE an rule of thumb or is there a formula? 

As to system information. 
510 sq ft collector 
100,000 btu HE ( main problem I think)
70,000 gal pool
Uncovered ( other main problem. )

The problem is that it's not getting the pool warm. 

Thanks for all the help and advice. 

Jay
Peltz power


Sent from my iPhone

> On Apr 5, 2015, at 4:56 PM, Tom Lane <tom at ecs-solar.com> wrote:
> 
> Most heat exchangers for swimming pools are designed for boilers delivering 140F or 190F as a heat source based on the size and/ or the number gallons in the pool . The solution for a low temperature source like solar in order to keep the approach temperature low to the flat plate collectors ( and efficiency high ) is to use either double the number of heat exchangers recommend for the boiler or using a much larger heat exchanger ( twice the size required by a boiler for the recommend pool size  )  . Make sure you use a titanium or stainless steel one designed for pool chemicals including salt water . DO NOT USE EVACUATED TUBES TO HEAT A SWIMMING POOL , ! Use selective coated flat plate collectors if the ambient air temperature is -20F to 60 F  when you are heating an indoor swimming pool to less than 95F .  Quality Pool Manufacturing , Aico , Triangle Tube , and Spirec are among many who make heat exchangers for swimming pools suitable for the high flow rates required by sol
> ar systems . GatorTom PS : yes they can be used for heating water for alligator farms . 
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