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canna change law physics
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BTW - my pool in Houston is 93F today - Cooler than 102 air temp...
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I see you
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Just think of the energy needed to drop thousands of gallons by a few degrees.
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Join Date: Oct 2001
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My old boss from my old team moved from NY to Plano. He's got a pool. He told me last year that he wants the pool to be 95º. Sounds crazy to me. Of course, I think the temps in the center of Texas have been in the 97-107º range lately, so 95º might not feel horrible. But I suspect 82-85º would be much, much better.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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30,000 gallons 85º to 95º takes 733.6 Kwh (equal to 2640954377J / 628798661cal / 733599Wh / 2503141 btu). IIRC, 10º∆ is the same whether it's + or -.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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I would assume that if you had a solar heater, that it would work as a cooler if you ran it at night or when the sun was down. My mom's old pool was solar heated and was basically just a black plastic radiator on the roof. I think running that at night would cool the pool off if you had one like that.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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canna change law physics
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Evap cooling works great. 965 BTU per pound or 8060 per gallon. In my pool, about 25 gallons per degree F
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James The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994) Red-beard for President, 2020 |
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You do not have permissi
Join Date: Aug 2001
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Quote:
There is a *prized* warm-water salt lap pool around here in Michigan. With a higher-temp Jacuzzi to boot. The very best for physical rehab. People will always obtain something great, available to only few, served on golden platter with bended knee, and want something different...
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canna change law physics
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Honestly, even at 93, it keeps you cool when the air temp is 102
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James The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994) Red-beard for President, 2020 |
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Especially if you're in full sun vs shade.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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Put a roof on that thing to keep the sun off it. Screen it in to keep the bugs and critters out.
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I don't know hw you keep the chlorine levels up in that weather. Or are you on salt?
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Everything being equal, it takes more electricity to cool 10° than it does to heat 10°. A heater is a heating element which is basically a resister with power applied. Water is circulated past the heated element. Requires a heating element and a water pump. A cooler involves compressing a refrigerant to pressures above 100psi, running it through a cooler, then expanding it through a nozzle to get evaporation (and hence cooling). The pool water is circulated through a heat exchanger where the cold refrigerant cools the water and the refrigerant is compressed again… lots of moving parts, indirect energy conversion, requires a compressor, a fan, and a water pump. Agreed that the energy required to heat water 10° is the same as to cool it 10° but practically, the energy inputs needed to cut a cooler to accomplish this are probably 2-3X more than a heater.
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Quote:
https://floridasolardesigngroup.com/cool-your-pool-with-a-solar-pool-heater/ It works like a radiator.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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canna change law physics
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Quote:
The best you can do with an evaporative cooler is the "Wet Bulb" temperature. For example, today it is 100F and RH41%, this leads to a dew point of 71, a "Feels Like" of 123 and a wetbulb of 80.61. So, as my pool water circulates at 25 GPM, it is cooled to 80.61F. Assuming I start at 93F water, I'll cool about halfway to the dewpoint with a full turnover of water, which is about 17 hours. Call it a day. The sun adds about 3 degrees per day, so I will still need to keep running the evap chiller several hours per day to keep the water about 86F. The GPC 210 uses 528 Watts. 10 hours is about 5kWh, which is about 50 cents per day for me.
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All of this guessing, round numbers, and wild approximations. Do you have any real, specific numbers? sheesh! ![]() ![]() ![]()
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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You do not have permissi
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There are retractable pool covers which would keep sunlight and some debris off the water.
An air gap would ensure positive upwards flow of any heat differential: ie pool is warmer than the air. 4 feet below the frost line it's probably about 40-60deg constant which would be a heat sink unless it's insulated.
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canna change law physics
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Quote:
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James The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994) Red-beard for President, 2020 |
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Quote:
I have a well for water here and my cold water is ~78º. Some of that warmth is probably from the ground that the water has no run through to get from the well to the house, but that's still pretty warm.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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You do not have permissi
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You guys got some kind of thermal differential or heat pumps wouldn't work.
(why not for pools?) https://www.outlookindia.com/international/in-photos-icy-winters-snowfall-in-texas-photos-258659
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My pool's only about 80 right now...was thinking I need to get a solar blanket to warm it up some
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