Pool heater: science question

jeeper

Currently without Jeep
Location
So Jo, Ut
I have built a pool heater out of black plastic hose. It gets super hot after just an hour or so in the sun. I pump water into it, let it sit, then pump it out and repeat.
here is my question: would the pool warm faster doing it the way I do, or continually letting it pump through the hose?
I am adding a gallon or two of really hot water ever hour or so. But would adding a tiny bit of warmer water continually be more or less effective? Exact same?
 

I Lean

Mbryson's hairdresser
Supporting Vendor
Location
Utah
I think you'd warm faster by pumping continually. The colder the water in the coil, the faster it will heat. (larger temp differential) So letting it get hot sitting stagnant, you won't be fully "collecting" the sun.

Either that, or I'm wrong. :)
 

Hickey

The Dark One
Supporting Member
I think you'd warm faster by pumping continually. The colder the water in the coil, the faster it will heat. (larger temp differential) So letting it get hot sitting stagnant, you won't be fully "collecting" the sun.

Either that, or I'm wrong. :)
I agree with this. It takes a ton of hose to warm it quickly.
 

UT410

RME's Holistic Healer
Supporting Member
Location
Holladay
I don't know where your setup is located as far as landscaping goes but I was at a client's home, recently, where he ran something similar to what you mention but he covered the piping (or buried) in 3-6" stones as part of the landscape. I thought it was a pretty slick idea. The stones hold the heat and he can run his pump past sunset. I'm guessing he doesn't really need to though.
 

J-mobzz

Well-Known Member
I ran a few of the eBay solar heaters on an old pool. I just had it split off the pump so slower flow of water went through then dumped it in the pool via 1/2 hose. It was much warmer going in. The thing that I found made the biggest difference was a good cover. I bought a nice thermal (bubble wrap ) style cover and it made a really big difference
 

jeeper

Currently without Jeep
Location
So Jo, Ut
I ran a few of the eBay solar heaters on an old pool. I just had it split off the pump so slower flow of water went through then dumped it in the pool via 1/2 hose. It was much warmer going in. The thing that I found made the biggest difference was a good cover. I bought a nice thermal (bubble wrap ) style cover and it made a really big difference

I’ve thought of these as well.. but everything on Amazon is cheap junk that falls apart. Maybe a better one from the pool supply would be good.
 

J-mobzz

Well-Known Member
I’ve thought of these as well.. but everything on Amazon is cheap junk that falls apart. Maybe a better one from the pool supply would be good.
I remember pulling the cover off on a few hot days and that top 6" of water being over 90deg. I think a good solar cover is worth the cost.
 

frieed

Jeepless in Draper
Supporting Member
Location
Draper, UT
Before you spend a bunch of cash on a heating solution, try one of the liquid pool cover products. They work by forming a very thin layer on the surface of the water that reduces evaporation, some by up to 85%. It takes heat energy to evaporate water and that heat comes from the water itself. I used it for my pool when I lived in Texas with typical 60-70% RH air and it made a noticeable difference. I would think it would be an even more significant difference in this area with the low RH doing it's best to suck the water out of the pool.
 
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