Comparison of Shaft and Boundary Work

The purpose of

power cycles

is to convert heat into work as efficiently as possible.
Recall that areas on PV Diagrams can be interpreted as boundary or shaft work for certain types of systems.

Closed Systems
Internally Reversible Processes

PV Diagram showing boundary work as the area under a process path.
Wb = 0 for constant V Processes

Open Systems
Internally Reversible Processes

SS, SISO, ΔEpot = ΔEkin = 0
Equation. for constant P processes
PV Diagram showing shaft work as the area to the left of the process path.
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Ch 9, Lesson A, Page 2 - Comparison of Shaft and Boundary Work