Given that ground water is 50* at 10 feet ,how long it takes for 60* water to lose 10*.?

I'm trying to determine the size of an underground tank for a geothermal application.

billrussell422014-03-13T17:02:56Z

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too many unknowns. You need the temperature and thermal resistance and thermal conductivity of all the surroundings as well as size and shape of the container. And a very large computer.