Estimate the energy extracted from 1 km 3 of granite if cooled from 300 C to
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Estimate the energy extracted from 1 km3 of granite if cooled from 300 ◦C to 200 ◦C. Assume that a power plant runs between the (time-varying) temperature Tg of the granite and an ambient temperature of 20 ◦C and reaches 1/2 of the Carnot efficiency at each Tg. For how long could a 100 MW power plant run off this energy?
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