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Here in Toronto Ontario they have been doing this for a few years now. Below about 100 ft Lake Ontario remains a constant 41F or 4C year round, the point at which water is most dense. Big pipe runout into the lake to collect the water at 230 ft. Hence the name Deep Water Cooling. Circulated around a number of office towers for A/C usage. True the catch is location, only a few big cities on the shore of a Great Lake. What is done with the warmed lake water I dont know. I assume it could just be dumped into the city storm sewers and return to the lake.
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