Irreversibility and Lost Work

Equation.
(Be careful about the sign convention for work.)
In the previous lesson, we defined the

isentropic efficiency

of

adiabatic compressors

and

turbines

as follows:
Equation.
Equation.
Equation. = work that is wasted due to irreversibilities in a process
Lost Work :
Flow diagram of a compressor.
T1 , P1
Wirrev > Wrev
T2 , P2
Flow diagram of a turbine.
T1 , P1
Wirrev < Wrev
T2 , P2
Adiabatic compressor :
Adiabatic turbine:
Equation.
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Ch 8, Lesson D, Page 1 - Irreversibility and Lost Work