Problem 2.126

Find the efficiency of a cycle consisting of two isobaric and two isothermal lines if the pressure varies $n$ -fold and the absolute temperature $\tau$ -fold within the cycle. The working substance is an ideal gas with the adiabatic exponent $\gamma$ .

\eta=\frac{(\tau-1) \ln n}{\tau \ln n+(\tau-1) \gamma /(\gamma-1)}

Second law of thermodynamics, entropy