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thermodynamics solution chapter 3

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cengel 열역학 9판 si버젼 3장 솔루션 (thermodynamics)
Mechanical engineering (Kyung Hee University)
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u100 0.19%
0.001041
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Vf
mf
mg
x
P1
T1
P
x2
0.2 u 0.14 0.028 m 3 and V g
Vf
0.028 m 3
vf
0.0007905m 3 /kg
Vg
0.112 m 3
vg
0.051266m 3 /kg
mg
mt
2.185 kg
37.61 kg
1.4 MPa
250 D C
Psat@120D C
v 2 v f
v fg
½
¾ v1
¿
0.8 u 0.14 0.112 m 3
R-134a
0.14 m3
400 kPa
35.42 kg
2.185 kg
0.05810
0.16356 m 3 /kg
H2O
1.4 MPa
250qC
198.67 kPa
T
1
0.16356 0.001060
0.1825
0.89133 0.001060
2
v
h
h f xh fg
503.81 0.1825u 2202.1 905.7 kJ/kg
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0.4
0.35
x[2]
0.3
0.25
0.2
0.15
0.1
800
1000
1200
1400
P[1] [kPa]
š
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1600
1800
2000
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SteamIAPWS
700
600
T [°C]
500
400
300
200
1
1400 kPa
198.7 kPa
100
2
0.05 0.1
0
10-3
10-2
10-1
100
0.2
0.5
101
102
3
v [m /kg]
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V
m2
'm
(10 kg)(0.287 kPa ˜ m 3 /kg ˜ K)(293 K)
150 kPa
m1 RT1
P1
P2V
RT2
(250 kPa)(5.606 m 3 )
(0.287 kPa ˜ m 3 /kg ˜ K)(306 K)
5.606 m 3
Air, 10 kg
150 kPa
15.96 kg
20qC
m 2 m1 15.96 10 5.96 kg
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TR1
T1
Tcr
313 K
305.5 K
PR1
P1
Pcr
550 kPa
4480 kPa
TR 2
v R2
P2
T2
Tcr
Ethane
550 kPa
0.960
40qC
(0.960)(0.2765 kPa ˜ m 3 /kg ˜ K)(313 K)
550 kPa
Z 1 RT1
P1
v1 v 2
½
°
°
¾ Z1
0.123 °
°¿
1.025
553 K
305.5 K
0.1511m 3 /kg
1.810
v 2,actual
0.1511m 3 /kg
RTcr /Pcr
(0.2765 kPa ˜ m 3 /kg ˜ K)(305.5 K)/(4480 kPa)
Z 2 RT2
(1.0)(0.2765 kPa ˜ m 3 /kg ˜ K)(553 K)
v2
0.1511m 3 /kg
½
°
°
¾ Z2
8.01 °
°
¿
1012 kPa
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1.0
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(1600 kPa)(0.01343 m 3 /kg)
T
Pv
R
a
27 R 2Tcr2
64Pcr
b
RTcr
8Pcr
T
1§
a ·
¨P 2 ¸ v b
R©
v ¹
0.08149 kPa ˜ m 3 /kg ˜ K
263.7 K
(27)(0.08149 kPa ˜ m 3 /kg ˜ K) 2 (374.2 K) 2
(64)(4059 kPa)
(0.08149 kPa ˜ m 3 /kg ˜ K)(374.2 K)
8 u 4059 kPa
P 1600 kPa
½
T
0.01343 m 3 /kg ¾¿
v
0.09663 m 6 ˜ kPa/kg 2
0.000939 m 3 /kg
·
§
1
¨1600 0.09663 ¸ 0.01343 0.000939
2
¨
0.08149 ©
(0.01343) ¸¹
70qC (343 K)
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327.4 K
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0.046
0.044
0.042
ideal gas
0.038
3
v [m /kg]
0.04
0.036
Beattie-Bridgeman
0.034
Table
0.032
0.03
0.028
110
115
120
125
130
135
140
T [K]
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145
150
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q
Pv, air
IPsat @ Tair
Pv, water surface
Twater
Tsat @ Pv
IPsat@20qC
Pv, air
(0.35)(2.3392 kPa)
Thermos
bottle
0.8187 kPa
20qC
35%
0.8187 kPa
Tsat @ 0.8187 kPa
4.1qC
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Steam IAPWS
106
105
P [kPa]
104
103
1
300 kPa
102
250°C
150 kPa
111,4°C
2
101
100
10-4
10-3
10-2
10-1
v [m3/kg]
100
101
102
Steam IAPWS
700
600
T [°C]
500
400
300
200
100
0
10-3
250qC
1
300 kPa
111.35qC
150 kPa
10-2
10-1
2
100
101
102
v [m3/kg]
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v
v
SteamIAPWS
106
105
P [kPa]
104
103
102
400
300
200
2
133.5°C
1
101
0.525
100
10-4
10-3
10-2
10-1
100
101
102
3
v [m /kg]
v
v
SteamIAPWS
700
600
300 kPa
T [°C]
500
198.7 kPa
400
100 kPa
300
200
2
100
1
0.7163
0
10-3
10-2
10-1
100
101
102
3
v [m /kg]
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v
v
v
R134a
105
P [kPa]
104
103
1
400
280
200
-1.25°C
2
102
0.06
101
10-4
10-3
10-2
10-1
100
101
3
v [m /kg]
v
v
R134a
250
200
T [°C]
150
100
1
75
50
1200 kPa
20
0 0.6
572 kPa
300 kPa
2
-50
0.02
-100
10-4
10-3
10-2
10-1
100
3
v [m /kg]
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v
v
v
v v
v
TR
T
Tcr
293 K
154.8 K
PR
P
Pcr
4 MPa
5.08 MPa
v v
½
°
°
¾ Z
0.787 °
°
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1.893
0.975
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lOMoARcPSD|12649116
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lOMoARcPSD|12649116
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Downloaded by ?? (ken0201308@gmail.com)
lOMoARcPSD|12649116
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Downloaded by ?? (ken0201308@gmail.com)
lOMoARcPSD|12649116
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lOMoARcPSD|12649116
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