Factors which affect Carnot Efficiency

Example: Consider a Carnot heat engine operating between a high-temperature source at 900 K and rejecting heat to a low-temperature reservoir at 300 K.  (a) Determine the thermal efficiency of the engine;  (b) Show how the thermal efficiency changes as the temperature of the high-temperature source is decreased; (b) Determine the change in thermal efficiency as the temperature of the low-temperature sink is decreased

Lower TH

Increase TL