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Quiz #19 [20 Points] Analyzing Adiabatic Mixing of Two Moist Air Streams
Example 12.14 [pgs. 782-784]
A stream of 142 m³min of moist air at a temperature of 5°C and a humidity
ratio of 0.002 kg(vapor)/kg(dry air) is mixed adiabatically with a second stream
consisting of 425 m³/min of moist air at 24°C and 50% relative humidity. The
pressure is constant at 1 bar.
Systems Schematic:
Process Diagram:
Assume:
Property Values:
1-
m/kg
hi
kJ/kg
kg/kg
12=
m³/kg
h:-
kJ/kg
W₂ =
kg/kg
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7
Quiz #19 [20 Points] Analyzing Adiabatic Mixing of Two Moist Air Streams
Example 12.14 [pgs. 782-784]
A stream of 142 mmin of moist air at a temperature of 5°C and a humidity
ratio of 0.002 kg(vapor)/kg(dry air) is mixed adiabatically with a second stream
consisting of 425 m³/min of moist air at 24°C and 50% relative humidity. The
pressure is constant at 1 bar.
1. The mass flow rate of the exiting stream in kg/min is
a. 180
b.
c.
497
677
d. none of the above.
2. The temperature of the exiting stream in °C is
a.
5
b.
19
c. 24
d. none of the above.
3. The humidity ration of the existing stream in kg/kg is
a.
0.0020
b.
0.0074
c.
0.0094
d. none of the above.
4. The enthalpy of the existing stream in kJ/kg is
a. 10.0
b. 37.7
c. 47.8
d. none of the above.
5. Solution of this problem to determine the work output of the required use of
a. Property Relations
b. Conservation of mass
c. Conservation of Energy
d. all of the above.
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