Question

What should be efficiency of carnot cycle?

Answer 1

Answer:

The Carnot cycle can be thought of as the most efficient heat engine cycle allowed by physical laws. When the second law of thermodynamics states that not all the supplied heat in a heat engine can be used to do work, the Carnot efficiency sets the limiting value on the fraction of the heat which can be so used.

Answer 2

All thermal power plants (including concentrating solar thermal, CST) need a cooling system to cool the turbine exhaust. It is well known that the Carnot cycle efficiency ( η thermal = 1 − T L T H ) is maximized with the highest possible heat source temperature TH and the lowest possible heat sink temperature TL.