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CPE 111 PRACTICE QUESTIONS
1.
The vessel shown in the diagram to the right originally contains 120 lb
m
of
water vapor at 250 ºF.
The vessel contents are cooled to a final
temperature of 150 ºF, and 21.43 % of the vapor condenses to form a
liquid.
No material enters or leaves the vessel.
The table below summarizes the properties of water.
Molecular Weight = 18.02
Btu
Btu
18.15
18.13
lbmole F
lbmole F
Btu
Btu
7.39
5.59
lbmole F
lbmole F
Btu
Btu
18,170
16,960
lbmole
lbmole
LIQUID
LIQUID
PV
VAPOR
VAPOR
VAPORIZATION
VAPORIZATION
CC
hu
==
⋅°
∆=
Water Properties
Calculate the total heat transfer for the vessel contents.
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The sketch below shows a water pumping station that you are to design.
The
application requires that 1000 liter/min water will enter the pump at 150 kPa.
Downstream and 75 m above the pump inlet, the pressure will be 400 kPa.
You have made some friction loss calculations and estimate that friction loss
will be 175 J/kg water.
You are assuming that the velocity change is
negligible.
The density of water is 1.00 g/cm
3
and its molecular weight is 18.02.
Calculate the required pump power in kW.
1
2
P
1
= 150 kPa
P
2
= 400 kPa
75 m
3.
Propane vapor at 50
o
F and 60 psi enters a heat exchanger at a mass flow rate
of 1000 lb
m
/h.
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This note was uploaded on 07/05/2008 for the course CPE 111 taught by Professor Weatherley during the Spring '08 term at Kansas.
 Spring '08
 WEATHERLEY

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