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Heating an Above Ground Pool Alex 10-10-2006
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Posted by on October 11, 2006, 10:31 am



>I can't believe you typed all that Rhetoric in there. jeeeeze.....

That's engineering, not rhetoric :-)

You are welcome.

Nick

>> Alex wrote:
>>
>>> We have a 25' above ground pool (48" deep), and we are looking for
>>> ways of heating the pool... We live in Texas...
>>
>> Is the pool shaded? In Austin, 940 Btu/ft^2 of sun falls on the ground
>> on an average 48.8 F January day with a 58.8 daily max temp. An R1 cover
>> with 80% solar transmission would make 0.8x940 = 24h(T-48.8)1ft^2/R1,
>> for a pool temp T = 81 F. An R2 cover with 3 layers of plastic film and
>> 70% solar transmission would make T = 104.
>>
>> An 84 F pool with a 491 ft^2 R1 cover needs about 24h(84-48.8)491/R1
>> = 415K Btu/day. If 1 ft^2 of 4/12 (18.4 degree) south roof collects
>> 940cos(18.4) = 892 Btu/day of overhead sun + 1200sin(18.4) = 379 Btu
>> of south sun, totaling 1271, and 80% enters an 84 F collector when
>> it's 53.8 outdoors for 6 hours and 0.8x1271-6h(84-53.8)1ft^2/R1 = 836
>> Btu/day, you might heat the shaded pool with 415K/836 = 496 ft^2 of roof,
>> eg buy a $129 No. 412700 27' round clear vs blue pool cover from
>> http://www.solarcovers.com (800) 433-4701 and put their $99 411632
>> 16'x32' cover on a roof over wires to keep it from gluing itself to
>> the roof when there's no water trickling over the shingles beneath it.
>>
>> With RC = R1x62.33x4' = 249 hours, the pool would cool from 84 F to
>> 48.8+(84-48.8)e^-(5x24/249) = 71 F over 5 cloudy days.
>>
>> In a cloudier climate, we might heat a pool with a cover inflated with air
>> during the day and soap bubble foam at night that can sink to the bottom
>> for swimming. In Phila, 620 Btu/ft^2 falls on the ground on an an average
>> 30 F January day. If 0.8x620 = 6h(84-30)1ft^2/R1 + 18h(84-30)1ft^2/Rv
>> Btu/day, the cover needs US Rv = 5.7 at night, about 2" of foam.
>>
>> Nick


Posted by Mark on October 10, 2006, 10:02 pm


To follow up on the OP's observation on the hot car:

Buy an old junker for $50 - preferably one with vinyl seats (black, of
course!)
Park it where the sun shines all day, and close to the pool
Buy 8 or 10 50 foot garden hoses and connect them end-to-end
Wrap them around the steering wheel, door handles, across the dash and seats
Connect to an inexpensive pump and let it curculate the water from the pool
Wha-La: heated water for you pool!

> Alex wrote:
>> Hello,
>>
>> We have a 25' above ground pool (48" deep), and we are looking for
>> ways of heating the pool now that it's starting to get cooler
>> outside. We live in Texas, and though our winters aren't bad, when
>> the temp stays below 85'F for most of the day and 50's at night, the
>> pool gets quite chilly.
>>
>> I'm looking at some options for heating the pool so we can use it
>> throughout the winter, or at least a few more months into the fall
>> now that the 90-100'F temps are gone.
>>
>> Does anyone have any experience with the solar heaters? I know even when
>> the temp stays in the 80s for most of the day the car is still VERY warm,
>> so I'd assume this is enough to heat the pool rather well with a solar
>> heater. We're looking at one similar to this:
>>
http://www.intheswim.com/Pool-Heaters/Solar-Heaters/Solar-Pool-Heaters-for-Above-Ground-Pools/
>>
>>
>> We just put the pool in earlier this summer, so paying another $800
>> or more for a powered heater isn't really possible -- but if we can
>> get good results from a solar heater, we'd like to go that route. We
>> havep lenty of space for it behind the pool.
>>
>> Thanks for any advise or suggestions --
>>
>> Alex
>>
> I recall a magazine article some years back where the homeowner found
> the solution to be black rubber garden hose. Positioned in the yard
> with ample sunlight all that was needed was to connect a pump.
>
> If recollection is correct the biggest problem was the water became too
> hot!
>
>



Posted by Goedjn on October 11, 2006, 12:06 pm



>To follow up on the OP's observation on the hot car:
>
>Buy an old junker for $50 - preferably one with vinyl seats (black, of
>course!)
>Park it where the sun shines all day, and close to the pool
>Buy 8 or 10 50 foot garden hoses and connect them end-to-end
>Wrap them around the steering wheel, door handles, across the dash and seats
>Connect to an inexpensive pump and let it curculate the water from the pool
>Wha-La: heated water for you pool!
>
>> Alex wrote:
>>> Hello,
>>>
>>> We have a 25' above ground pool (48" deep), and we are looking for
>>> ways of heating the pool now that it's starting to get cooler
>>> outside. We live in Texas, and though our winters aren't bad, when
>>> the temp stays below 85'F for most of the day and 50's at night, the
>>> pool gets quite chilly.
>>>
>>> I'm looking at some options for heating the pool so we can use it
>>> throughout the winter, or at least a few more months into the fall
>>> now that the 90-100'F temps are gone.
>>>
>>> Does anyone have any experience with the solar heaters? I know even when
>>> the temp stays in the 80s for most of the day the car is still VERY warm,
>>> so I'd assume this is enough to heat the pool rather well with a solar
>>> heater. We're looking at one similar to this:
>>>
http://www.intheswim.com/Pool-Heaters/Solar-Heaters/Solar-Pool-Heaters-for-Above-Ground-Pools/
>>>
>>>
>>> We just put the pool in earlier this summer, so paying another $800
>>> or more for a powered heater isn't really possible -- but if we can
>>> get good results from a solar heater, we'd like to go that route. We
>>> havep lenty of space for it behind the pool.
>>>
>>> Thanks for any advise or suggestions --
>>>
>>> Alex
>>>
>> I recall a magazine article some years back where the homeowner found
>> the solution to be black rubber garden hose. Positioned in the yard
>> with ample sunlight all that was needed was to connect a pump.
>>
>> If recollection is correct the biggest problem was the water became too
>> hot!

Build a solar death ray with a focal distance of around 4',
and aim it at a black anodized copper target floating
in the pool.

http://www.solardeathray.com/

--Goedjn



Posted by Don Phillipson on October 11, 2006, 2:15 pm



> We have a 25' above ground pool (48" deep), and we are looking for ways
> of heating the pool now that it's starting to get cooler outside.

Three basic methods:
1 Conservation = use of a solar blanket (bubble
blanket) to delay loss of heat on cool nights.
2 Active heating, burning electricity or fuel.
3 Passive solar = adding to the pump circuit
a long length of black hose exposed to the sun.
During recirculation, this travel through sunshine
increases water temperatures 2 to 5 degrees
Celsius even in Canada. Special multi-channel
hose is sold specially for this purpose.

--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)



Posted by on October 11, 2006, 3:31 pm


On Wed, 11 Oct 2006 14:15:56 -0400, "Don Phillipson"

>
>> We have a 25' above ground pool (48" deep), and we are looking for ways
>> of heating the pool now that it's starting to get cooler outside.
>
>Three basic methods:
>1 Conservation = use of a solar blanket (bubble
>blanket) to delay loss of heat on cool nights.
>2 Active heating, burning electricity or fuel.
>3 Passive solar = adding to the pump circuit
>a long length of black hose exposed to the sun.
>During recirculation, this travel through sunshine
>increases water temperatures 2 to 5 degrees
>Celsius even in Canada. Special multi-channel
>hose is sold specially for this purpose.


I am very skeptical of these black hose schemes unless you have a
shitload of hose. They size solar collectors as a percentage of the
pool surface area and systems that actually work in winter tend to be
over 100% of pool surface, even in Florida. My neighbor can hold 84-85
in Jan/Feb but he has 125% of his pool surface in collector on a south
facing roof and he has a bubble cover. I don't use a cover and have
about 75% collector/pool ratio. I can get daytime ambient air temp for
an evening swim. That still buys me about 3-4 extra months tho.

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