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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) 1. For state 1, show the system is in the superheated vapour phase   2. 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.

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) 1. For state 1, show the system is in the superheated vapour phase   2. 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.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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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)

1. For state 1, show the system is in the superheated vapour phase

 

2. 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 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.
Transcribed Image Text: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.
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