1. (a) A fluid at 0.7 bar occupying 0.09m3 is compressed reversibly to a pressure of 3.5 bar according to a law pv" = constant. The fluid is then heated reversibly at constant volume until the pressure is 4 bar: the specific volume is then 0.5m³/kg. A reversible expansion according to a law pv = constant restores the fluid to its initial state. Sketch the cycle on a p-v diagram and calculate: i) the mass of the fluid present; ii) the value of n in the first process; iii) the net work of the cycle. %3D

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A fluid at 0.7 bar occupying 0.09m³ is compressed reversibly to a pressure of
(a)
3.5 bar according to a law pv" = constant. The fluid is then heated reversibly at constant
volume until the pressure is 4 bar: the specific volume is then 0.5m³/kg. A reversible
expansion according to a law pv = constant restores the fluid to its initial state. Sketch the
cycle on a p-v diagram and calculate:
i) the mass of the fluid present;
ii) the value of n in the first process;
1.
iii) the net work of the cycle.
Transcribed Image Text:A fluid at 0.7 bar occupying 0.09m³ is compressed reversibly to a pressure of (a) 3.5 bar according to a law pv" = constant. The fluid is then heated reversibly at constant volume until the pressure is 4 bar: the specific volume is then 0.5m³/kg. A reversible expansion according to a law pv = constant restores the fluid to its initial state. Sketch the cycle on a p-v diagram and calculate: i) the mass of the fluid present; ii) the value of n in the first process; 1. iii) the net work of the cycle.
Table
6.5 Properties of
some common gases
at 300K
R
Gas
(kJ/kg K)
(kJ/kmol K)
(kg/kmol)
(kJ/kg K)
Diatomic
Carbon monoxide (CO)
Hydrogen (H2)
Nitrogen (N2)
Oxygen (O2)
0.2968
1.0410
14.3230
1.0400
0.9182
20.845
20.561
20.819
21.068
28.010
2.016
28.013
31.999
0.7442
1.399
29.158
28.875
29.134
29.382
4.1243
0.2968
0.2598
10.1987
1.404
1.399
1.395
0.7432
0.6584
Monatomic
Argon (Ar)
Helium (He)
0.5203
12.472
12.473
39.950
0.2081
2.0771
0.3122
1.666
1.666
20.786
20.788
5.1930
3.1159
4.003
Triatomic
Carbon dioxide (CO2)
Sulphur dioxide (SO2)
0.8457
0.6568
37.219
1.288
1.252
28.906
44.010
0.1889
0.6448
0.5150
41.306
32.991
64.060
0.1298
Hydrocarbons
Ethane (C,H6)
Methane (CH,)
Propane (C,Hg)
1.4903
1.7132
1.7668
1.186
53.128
35.795
74.578
44.813
27.480
66.263
30.070
0.2765
2.2316
1.6915
1.303
1.126
16.040
0.5184
0.1886
1.5029
44.090
Transcribed Image Text:Table 6.5 Properties of some common gases at 300K R Gas (kJ/kg K) (kJ/kmol K) (kg/kmol) (kJ/kg K) Diatomic Carbon monoxide (CO) Hydrogen (H2) Nitrogen (N2) Oxygen (O2) 0.2968 1.0410 14.3230 1.0400 0.9182 20.845 20.561 20.819 21.068 28.010 2.016 28.013 31.999 0.7442 1.399 29.158 28.875 29.134 29.382 4.1243 0.2968 0.2598 10.1987 1.404 1.399 1.395 0.7432 0.6584 Monatomic Argon (Ar) Helium (He) 0.5203 12.472 12.473 39.950 0.2081 2.0771 0.3122 1.666 1.666 20.786 20.788 5.1930 3.1159 4.003 Triatomic Carbon dioxide (CO2) Sulphur dioxide (SO2) 0.8457 0.6568 37.219 1.288 1.252 28.906 44.010 0.1889 0.6448 0.5150 41.306 32.991 64.060 0.1298 Hydrocarbons Ethane (C,H6) Methane (CH,) Propane (C,Hg) 1.4903 1.7132 1.7668 1.186 53.128 35.795 74.578 44.813 27.480 66.263 30.070 0.2765 2.2316 1.6915 1.303 1.126 16.040 0.5184 0.1886 1.5029 44.090
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