Would I still use 1-Tcold/Thot?

Question

The maximum temperature achievable with concentrated sunlight is the 5,800-K temperature of the Sun’s surface. Find the maximum thermodynamic efficiency of a heat engine operating between this temperature and the 300-K ambient temperature typical of earth.

Answer 1

The maximum efficiency possible is the efficiency of a Carnot cycle. Since the question asks for the maximum efficiency possible, you can use the equation for the efficiency of a Carnot cycle:

η = 1 - T_c/T_h