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 35.0°C water into the local air mass, which increases in temperature from 18.0°C to 20.0°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 18.0°C lowest temperature? (Part of Q_c could be utilized to operate heat engines or for simply heating the surroundings, but it rarely is.)