Heat Is Extracted from Hot Rock at a Temperature of 250°C

question 10

Essay

Heat is extracted from hot rock at a temperature of 250°C and used to produce electricity with the ideal Carnot efficiency. If the temperature of the cold reservoir is $75 ^ { \circ } \mathrm { C }$ , what mass of rock would be needed to yield $1 \mathrm { GWh } _ { e }$ ? See Chapter 8 for the thermal properties of typical rock, and assume a generator efficiency of $90 \%$ .

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