Chapter 15, Problem 55PE

A large electrical power station generates 1000 MW of electricity with an efficiency of 35.0%. (a) Calculate the heat transfer to the power station, Q_h, in one day. (b) How much heat transfer Q_c occurs to the environment in one day? (c) If the heat transfer in the cooling towers is from $\text{35}.0°\text{C}$ water into the local air mass, which increases in temperature from $\text{18}.0°\text{C}$ to $\text{2}0.0°\text{C}$, what is the total increase in entropy due to this heat transfer? (d) How much energy becomes unavailable to do work because of this increase in entropy, assuming an $\text{18}.0°\text{C}$ lowest temperature? (Part of Q_ccould be utilized to operate heat engines or far simply heating the surroundings, but it rarely is.)