L23A
        Isentropic efficiency
        Heat transfer and work in internally reversible
        steady-flow process

L23B
        Heat transfer
        Work in polytropic process
        Example 6.15 determining work and heat transfer for a
        polytropic compression of air

L23C
         Heat transfer (cont.)
        Definition of exergy

L23D
        Brief preview of chapter 11: thermodynamic relations
        Using equation of state