In Minnesota, arenas in St. Cloud, Paynesville, Austin and five other cities already use geothermal refrigeration systems to good effect. They'll be joined by a two-rink complex, the Burnsville Ice Arena, by October 2010 if all goes well.
In an arena geothermal refrigeration, the temperature-tempering qualities of the Earth are accessed. The temperature below the frost line is relatively constant, around 50 degrees. Loops of tubes are placed deep under the frost line, and a mixture of coolant and water is circulated. A heat pump extracts the heat, leaving behind a coolant cold enough to create ice for the arena.
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