Naik, Sameer V.
Fall 2009
1000
Solution for Special Problem 11
Given:
- Steam inside piston-cylinder device undergoing constant volume and constant
temperature processes
Find:
- P-v diagram
- Pressure (bar) at the end of constant volume cooling process
- Internal energy change (kJ) for the constant volume cooling process
- Pressure (bar) at the end of constant temperature process
System:
Saturated
Vapor
Initial State
P
1
= 20 bar
Assumptions:
- Negligible leakage in piston-cylinder device, i.e. closed system (mass constant)
- Quasistatic processes
Basic Equation(s):
V
m
v
=
f
g
f
y
y
x
y
y
−
=
−
Solution:
(a) The processes are shown on the P-v diagram below.

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