[RE-wrenches] Heat Exchangers Topic for Swimming Pools

[Gary Willett]

1 BTU = energy required to heat 1 lb of water 1 degree F in 1 hour

1 gallon of water = 8.34 lbs @ 62F

15000 gal water = 125,100 lbs

A 100 kBTU heater would heat the pool about 0.7F per hour.  

Sent from my iPhone 5s

> On Apr 5, 2015, at 7:49 PM, Jay <jay.peltz at gmail.com> wrote:
> 
> 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 s
> ol
>> ar systems . GatorTom PS : yes they can be used for heating water for alligator farms . 
>> _______________________________________________
>> List sponsored by Redwood Alliance
>> 
>> List Address: RE-wrenches at lists.re-wrenches.org
>> 
>> Change listserver email address & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>> 
>> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>> 
>> List rules & etiquette:
>> www.re-wrenches.org/etiquette.htm
>> 
>> Check out or update participant bios:
>> www.members.re-wrenches.org
>> 
> _______________________________________________
> List sponsored by Redwood Alliance
> 
> List Address: RE-wrenches at lists.re-wrenches.org
> 
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
> 
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
> 
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
> 
> Check out or update participant bios:
> www.members.re-wrenches.org
>