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Problem 3.1 (use EES)
Ammonia vapor is compressed inside a cylinder fitted with a piston.
The following data
have been experimentally measured during the process.
Pressure
[psia]
Volume
[in
3
]
65
80
80
67.2
93
60.1
110
52.5
134
44.8
161
37.6
190
32.5
a)
Determine the work done on the ammonia (in units of both ftlbf and Joules) during this
process by numerically integrating the data.
Note that the EES Integral function can be
used to do the integration.
Choose the ammonia to be the system.
W is the integral of P dV.
We have PV data and
these can be numerically integrated.
First, enter the data into a Lookup table.
Select New
Lookup Table from the Tables menu and specify 2 columns and 7 rows.
Enter the data.
The pressure at any given volume can be determined by interpolating the data.
P=interpolate('PvsV',P,V,V=V)
"pressure at specified volume"
Now use the Integrate function to integrate the data from the initial to the final volume.
We
can also convert the units to ftlbf in the same equation.
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This note was uploaded on 06/18/2011 for the course ME 342 taught by Professor Sander during the Spring '11 term at Wisconsin Milwaukee.
 Spring '11
 Sander

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