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Need opinions on Pool Water Chiller idea.

Fish HaidFish Haid Posts: 8,417 Admiral
I was thinking about making a pool water chiller by burying a coil of pipe underground. Water would flow from pump, through buried coil, and then back to pool. I previously made a solar heater using 200 feet of 1" black plastic pipe.

One question is how cool is it about 4 feet under my yard? I have about 5-6' of sand over a hard clay layer. I guess I'd want to get the coil right down on the clay for max cooling. I don't think plastic pipe will exchange enough heat. Do you think 50' of 1/2" diameter copper coil would do the job?

Pool water gets from 86 up to 92 at times when it's really hot. I'd like to drop it by 5-6 degrees at least, or it won't be worth the effort.

I was thinking about driving a 1" PVC into the ground about 5', flushing the dirt out with water and dropping a thermometer down there on a string to see what the temp is below ground. I'd guess about 75 maybe?


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