Lost Work

Lost Work

Watch the sign convention ! This equation applies to both turbines and compressors.
Where :
actual rate at which work is done by a real process operating between states 1 and 2.

rate at which work is done by a completely reversible process operating between the same initial and final states.

Such a process must be internally reversible and all heat exchange must be reversible as well.

Heat exchange only occurs with the surroundings, not a thermal reservoir.

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Ch 8, Lesson D, Page 2 - Lost Work