Chapter 14, Problem 72PE

Integrated Concepts

In certain large geographic regions, the underlying rock is hot. Wells can be drilled and water circulated through the rock for heat transfer for the generation of electricity. (a) Calculate the heat transfer that can be extracted by cooling $\text{1}.00{\text{ km}}^{\text{3}}$ of granite by $\text{1}00°\text{C}$. (b) How long will it take for heat transfer at the rate of 300 MW, assuming no heat transfers back into the $\text{1}.00{\text{ km}}^{\text{3}}$ of rock by its surroundings?