Thermodynamic II: Final Test (Spring 2014)
Name: _
1. (50 points)
Short Answer Questions:
A- In a gas mixture, which component will have the higher partial pressure: (a) the one with
the higher mole number or (b) the one with the larger molar mass? _
B- H
Consider a steam power plant that operates on the ideal reheat Rankine cycle. The plant
maintains the boiler afglllﬂlﬂl kl'a,the reheat section am kPa, and the condenser aﬂll} kPa.
The miIture qualityr at the exit of both turbines is 93 percent. Determine
The net work output and the thermal efﬁciency for the Carnot and the simple ideal Rankine
cycles with steam as the working ﬂuid are to be calculated and compared. Steam enters the
turbine in both cases at l'llI MPa as a saturated vapor, and the condenser
A steam Rankine cycle operates the condenser at l psia and the boﬂer at 2,501! psia, 1While the
temperature at the inlet of the turbine is m. The turbine's isentropic efﬁciency is 9|} percen
the pump losses are negligible, and the cycle is sized to produc
Consider a it ealljr—ﬂow Carnot cycle with water as the worldng ﬂuid. The maximum and
minimum temperature! in the cycle are 351} and WC. The qualitjr of water is 11.39] at the
beginning of the heat—rejection process and ll]'.l at the end. Determine {a} th
Ideal Ericsson
Otto
s = const
T = const
Ideal Stirling
s = const
Diesel
T = const
s = const
T-s Diagram
P-v Diagram
Brayton
Compression
T2 P2
=
T1 P
1
P1 v 2
=
P2 v1
k 1
k
wc =1 w2 = h2 h1
1
P
v
1
= RT1 ln 2
P2
v1
P
1
q L =1 q2 = RT1 ln =1 w2
P2
w2 =
Department of Mechanical Engineering MECH 3020
Auburn University Fall 2013
MECH 3020 Midterm |
50 minutes
Open Book Only
Name: 80/; £94
Please read the questions carefully before beginning to work. Do your own work. Acts of dishonesty and any
form of chea
ASHRAE PSYCHROMETRIC CHART NO.1
NORMAL TEMPERATURE
BAROMETRIC PRESSURE: 101.325 kPa
R
.030
R
Copyright 1992
AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS, INC.
1.0
.028
30
1.0
-00
.026
SENSIBLE HEAT
TOTAL HEAT
Qs
Qt
.024
0
.022
Department of Mechanical Engineering
Auburn University
MECH 3020
Fall 2013
MECH 3020 Quiz V
20 minutes
Open Book Only
SOLUTION
Name:
A rigid, well-insulated tank contains two separate chambers. One chamber contains 2.5 kmol of CO2
at 200 kPa and 27C. The
Consider a coal—ﬁred steam power plant that produclﬂlll]I MW of electric power. The power
plant operates on a simple ideal Rankine cycle with turbine inlet conditions of 5 MPa and W
and a condenser pressure of 25 kPa. The coal has a heatinJﬂJr 1i'alue {en
- I I II III I “II” _
An aircraft engine operates as a simple ideal Brayton cycle. Consider such an engine
whose pressure ratio is 12.4 when heat is added to the cycle at a rate of 5111} kW; air
passes through the engine at a rate of 1.61 kgfs; and the ai