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Direct use geothermal is usually defined to include resources in the temperature range of approximately 20/spl deg/C to 150+/spl deg/C (68 to 302/spl deg/F). At the lower end of the range the resource generally requires the use of a heat pump for spare or process heating but some applications including aquaculture or fish farming are possible even at these low temperatures. Geothermal resources above...
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