IWarm,
Some of the best performing GSHP systems in the world use aquifers or rivers as their primary heat exchange fields. A prime example close to me is the Galt House East hotel in Louisville. It uses the third largest geothermal heat pump system in the world, pumping 7 million gallons per day from the Louisville aquifer into the Ohio river. The 4700 ton system is said to save $300,000 in heating and cooling costs per year over the adjacent, original Galt House hotel building. The original building runs off centrifugal chillers, a boiler, and a cooling tower.
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