Efficiency of Carnot Engine Using Ideal Gas

1-2: A reversible isothermal expansion with heat addition

(18.6)

2-3: A reversible adiabatic expansion

(18.7)

3-4: A reversible isothermal compression with heat rejection

(18.8)

4-1: A reversible adiabatic compression

	(18.9)
	(18.10)

Energy absorbed as heat

(18.11)

Thermal efficiency,

(18.12)

Here, for the ideal gases we can write

Also,

or,

(18.13)

So,

(18.14)