A closed system is comprised of 10kg of pure water substance initially at a temperature of 400 C and a pressure of 8.5 MPa (state 1) For state 1, show the system is in the superheated vapour phase Evaluate the specific volume of the steam in state 1 using the thermodynamic property tables and compare it to the value obtained assuming the steam behaves as an ideal gas. Which value would you have most confidence in (give reasons for your choice) The system now undergoes an isentropic (constant entropy) adiabatic process on which its pressure drops to 100 kPa (state 2). For state 2 show that the system is now in two-phase region Find the work done by the system on its surroundings during the process For steam the specific gas constant = 461.5 J/kgK
A closed system is comprised of 10kg of pure water substance initially at a temperature of 400 C and a pressure of 8.5 MPa (state 1)
For state 1, show the system is in the superheated vapour phase
Evaluate the specific volume of the steam in state 1 using the
Which value would you have most confidence in (give reasons for your choice)
The system now undergoes an isentropic (constant entropy) adiabatic process on which its pressure drops to 100 kPa (state 2).
For state 2 show that the system is now in two-phase region
Find the work done by the system on its surroundings during the process
For steam the specific gas constant = 461.5 J/kgK
Use the attached table of properties
![T
p/[bar]
(T/[°C])
300
350
400
450
500
600
200
['C]
250
. 0.3748
4. 2562
h. 2749
6.822
0.4252 0.4745 0.5226
2725
2962
7.271
0.5701
2883
3168
7.633
0.6172 0.6641
3045
2963
3272
3377
7.944
7.793
0.7108
3129
3484
8.087
0.8040
3300
3702
8.351
5
2644
2857
7.060
2804
3065
7.460
(151.8)
0.3156
2568
0.3522 0.3940 0.4344
2722
2958
7.182
2640
2851
6.968
2801
3062
7,373
0.4743 0.5136 0.5528 0.5919 0.6697
3044
3376
7.858
2881
3166
7.546
2962
3270
7.707
3128
h. 2757
S% 6.761
0.2728
3299
3701
8.267
(158.8)
3483
8.001
0.3001 0.3364 0.3714 0.4058
2800
3060
7.298
0.4397 0.4734
3043
2961
3269
3374
7.634
7.786
0.5069 0.5737
44 2573
h, 2764
6.709
2880
3164
7.473
7
2636
2846
6.888
2720
3127
3298
(165.0)
3700
8.195
2955
3482
7.929
7.106
0.2403
4. 2577
h. 2769
S% 6.663
0.2610 0.2933 0.3242 0.3544 0.3842 0.4138 0.4432 0.5018
2878
2960
3162
3267
8
2631
2840
6.817
2716
2951
7.040
2798
3057
7.233
3042
3373
7.723
3126
3481
7.866
3298
3699
8.132
(170.4)
7.409
7.571
0.2149
2581
9
(175.4)
2628
h
2835
6,753
0.2305 0.2597 0.2874
2714
2948
6.980
2796
3055
7.176
0.3144 0.3410 0.3674 0.3937 0.4458
3041
3372
7.667
2877
3160
7.352
2959
3266
7.515
3126
3480
7.811
3298
3699
8.077
h. 2774
6.623
0.1944
2584
0.2061 0.2328 0.2580
2711
2944
6.926
2794
3052
7.124
0.2825 0.3065 0.3303 0.3540 0.4010
3040
3370
7.617
10
2623
2829
6.695
2875
3158
7.301
2957
3264
7.464
3124
3478
7.761
3297
3698
8.028
h. 2778
S* 6.586
0.1317
2595
h. 279
S% 6.445
0.0996
(179.9)
0.1324 0.1520 0.1697
2697
2925
6.711
0.1865 0.2029 0.2191 0.2351 0.2667
3035
3364
7.423
2952
3256
7.268
15
2597
2784
3039
6.919
2868
3148
7.102
3120
3473
7.569
3294
3694
7.838
(198.3)
h
2796
6.452
0.1115 0.1255
4. 2600
h. 2799
6.340
0.1386 0.1511
2946
3248
7.126
0.1634
3030
3357
7.283
0.1756 0.1995
3291
3690
7.701
20
(212.4)
2681
2774
2861
3116
h
3025
3138
6.957
2904
3467
7.431
6.547
6.768
0.0706 0.0812
0.0666
и, 2603
h. 2803
S% 6.186
0.0498
0.0905 0.0993 0.1078 0.1161 0.1324
3020
3343
7.082
30
(233.8)
2751
2845
3117
6.744
2933
3231
6.921
3108
3456
7.233
2646
3285
3682
7.507
h
2858
2995
6.289
6.541
4. 2602
h. 2801
6.070
0.0588
2728
2963
6.364
0.0664 0.0733 0.0800 0.0864 0.0988
3010
3330
6.935
2828
3094
6.584
40
2921
3214
6.769
3099
3445
7.089
3279
3674
7.368
(250.3)
h
0.0453 0.0519 0.0578 0.0632
2810
2907
3070
3196
6.451
6.646
0.0685 0.0786
3090
3273
3666
3433
6.975
7.258
0.0394
2597
h, 2794
S% 5.973
0.0324
2590
h. 2784
5.890
50
(263.9)
2700
2927
6.212
3000
3316
6.818
h
0.0362
2670
2887
6.071
0.0422 0.0473 0.0521 0.0566 0.0652
2988
3301
6.719
60
2792
3045
6.336
2893
3177
6.541
3081
3421
6.879
3266
3657
7.166
(275.6)
0.0274
2581
v/[m'/kg]
u/[kJ/kg]
h/[kJ/kg]
s/tkJ/kg k]
0.0295
2634
2841
5.934
0.0352 0.0399
2772
2879
3018
3158
6.231
6.448
0.0441
2978
3287
6.632
0.0481 0.0556
3073
3260
3410
3649
6.796
7.088
70
(285.8)
h. 2772
5.814
See footnote on p. 6.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Feb9eb4d2-2a3c-4f42-8c5c-cfe2909c2bb6%2Ff7830862-b3d1-42cc-b3ac-7d266bccfd59%2F6v58fi_processed.png&w=3840&q=75)
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