Converting sunlight to electricity with solar cells has an efficiency of 15%. It
ID: 2148941 • Letter: C
Question
Converting sunlight to electricity with solar cells has an efficiency of 15%. It's possible to achieve a higher efficiency (though currently at higher cost) by using concentrated sunlight as the hot reservoir of a heat engine. Each dish in the figure concentrates sunlight on one side of a heat engine, producing a hot-reservoir temperature of 500^circ { m C} . The cold reservoir, ambient air, is approximately 24^circ { m C}. The actual working efficiency of this device is 30%.What is the theoretical maximum efficiency?
_when i do my work, i get 61.5. but mastering physics says it is wrong
Explanation / Answer
eff = 1 - (T_C / T_H)=1-(297/773)=61.57%