Saturated steam at 99.6 °C is heated to 350°C. Use the steam table provided to determine: a. The required heat input if 1 kg of steam undergoes the process in a variable-volume constant-pressure container. b. The work of expansion (in k) of the steam undergoing the process. c. The required heat input if a continuous stream flowing at 1 kg/s undergoes the process at constant pressure. d. Does your numeric answer to part c equal the sum of parts b and a? Explain why or why not. Given: 1 bar = 10 N/m, Q=AH, Q = AU, AH = AÙ + PAV, table B.7 in kJ/kg and m°/kg.
Saturated steam at 99.6 °C is heated to 350°C. Use the steam table provided to determine: a. The required heat input if 1 kg of steam undergoes the process in a variable-volume constant-pressure container. b. The work of expansion (in k) of the steam undergoing the process. c. The required heat input if a continuous stream flowing at 1 kg/s undergoes the process at constant pressure. d. Does your numeric answer to part c equal the sum of parts b and a? Explain why or why not. Given: 1 bar = 10 N/m, Q=AH, Q = AU, AH = AÙ + PAV, table B.7 in kJ/kg and m°/kg.
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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Transcribed Image Text:Saturated steam at 99.6 °C is heated to 350°C. Use the steam table provided to determine:
a. The required heat input if 1 kg of steam undergoes the process in a variable-volume constant-pressure container.
b. The work of expansion (in kJ) of the steam undergoing the process.
C. The required heat input if a continuous stream flowing at 1 kg/s undergoes the process at constant pressure.
d. Does your numeric answer to part c equal the sum of parts b and a? Explain why or why not.
Given: 1 bar =
10 N/m4, Q= AH, Q = AU, AA = AÛ + PAV, table B.7 in kJ/kg and m/kg.
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APPENDIX B Physical Property Tables
TABLE B.7 Properties of Superheated Steam“
P(bar)
(Tsat. °C)
Sat'd
Water
Sat'd
Temperature (°C)→
50
Steam
75
100
150
200
250
300
350
2689
2517
3177
2890
0.0
2595
2642
2784
2880
2978
3077
(-)
2446
2481
2589
2662
2736
2812
2640
2480
2783
2588
2977
2736
191.8
2584.8
2438.0
2593
2444
2688
2516
2880
2661
3077
2812
3177
2890
0.1
(45.8)
191.8
V 0.00101
14.7
14.8
16.0
17.2
19.5
21.8
24.2
26.5
28.7
340.6
2683
2512
3.41
0.5
2646.0
209.3
209.2
313.9
2780
2878
2979
3076
3177
2586
3.89
2660
4.35
2889
5.75
(81.3)
340.6
2484.0
3.24
313.9
V 0.00103
2735
4.83
2811
5.29
0.00101
0.00103
209.3
209.2
0.00101
2975
2734
2.40
2675.4
417.5
417.5
V 0.00104
314.0
313.9
2676
2507
1.69
2776
2583
2875
2658
3074
2811
2.64
3176
2889
2.87
1.0
(99.6)
2506.1
1.69
0.00103
1.94
2.17
5.0
640.1
2747.5
209.7
314.3
419.4
632.2
2855
2961
3065
3168
209.2
0.00101
418.8
0.00104
2724
0.474
2803
0.522
(151.8)
639.6
2560.2
313.8
631.6
2643
0.425
2883
V 0.00109
0.375
0.00103
0.00109
0.571
762.6
761.5
V 0.00113
2776.2
2582
0.194
314.7
313.7
0.00103
2827
2621
2943
2710
419.7
3052
3159
2876
0.282
10
632.5
210.1
209.1
0.00101
631.4
0.00109
(179.9)
418.7
2794
0.00104
0.206
0.233
0.258
211.0
209.0
315.5
313.5
2902
2679
3025
2774
3139
2862
20
2797.2
2598.2
0.09950
420.5
852.6
850.2
908.6
633.1
(212.4)
906.2
418.4
603.9
V 0.00118
0.00101
0.00102
0.00104
0.00109
0.00116
0.111
0.125
0.139
A 1087.4
Û 1082.4
D 0.00125
Âu 1213.7
O 1205.8
D 0.00132
40
2800.3
212.7
317.1
422.0
634.3
853.4
1085.8
2962
3095
(250.3)
2601.3
208.6
313.0
417.8
630.0
848.8
1080.8
2727
2829
0.04975
0.00101
0.00102
0.00104
0.00109
0.00115
0.00125
0.0588
0.0665
635.6
629.1
2885
2668
2785.0
214.4
423.5
417.3
854.2
847.3
60
318.7
1085.8
3046
(275.6)
2590.4
0.0325
208.3
312.6
1078.3
2792
0.00101
0.00103
0.00104
0.00109
0.00115
0.00125
0.0361
0.0422
ÂU 1317.1
O 1306.0
V 0.00139
ÂĤ 1408.0
Û 1393.5
V 0.00145
Âu 1611.0
2759.9
2571.7
0.0235
425.0
416.7
855.1
845.9
80
636.8
2990
216.1
208.1
320.3
1085.8
2787
(295.0)
312.3
628.2
1075.8
2593
2750
0.00101
0.00102
0.00104
0.00109
0.00115
0.00124
0.0243
0.0299
2727.7
2547.3
217.8
207.8
100
322.9
426.5
638.1
855.9
1085.8
1343.4
2926
311.7
0.00102
(311.0)
416.1
627.3
844.4
1073.4
1329.4
2702
0.0181
0.00101
0.00104
0.00109
0.00115
0.00124
0.00140
0.0224
1086.2
222.1
207.0
150
2615.0
326.0
430.3
641.3
858.1
1338.2
2695
(342.1)
1586.1
2459.9
310.7
414.7
625.0
841.0
1067.7
1317.6
2523
0.00166
0.0103
0.00101
0.00102
0.00104
0.00108
0.00114
0.00123
0.00138
0.0115
ÂĤ 1826.5
Û 1785.7
V 0.00204
434.0
413.2
200
330.0
2418.4
2300.8
0.005875
644.5
622.9
860.4
837.7
226.4
1086.7
1334.3
1647.1
1307.1
0.00136
(365.7)
206.3
0.00100
309.7
1062.2
1613.7
0.00102
0.00103
0.00108
0.00114
0.00122
0.00167
1635.5
1600.3
645.8
1087.0
221.2(P.)
(374.15)(T.) Ô 2037.8
2108
2108
228.2
331.7
435.7
861.4
1332.8
2037.8
1302.9
0.00135
206.0
309.2
412.8
622.0
836.3
1060.0
V 0.00317
0.00317
0.00100
0.00102
0.00103
0.00108
0.00114
0.00122
0.00163
230.7
205.7
0.00100
250
334.0
437.8
647.7
862.8
1087.5
1331.1
1625.0
(-)
308.7
412.1
620.8
834.4
1057.0
1297.5
1585.0
0.00101
0.00103
0.00108
0.00113
0.00122
0.00135
0.00160
235.0
205.0
338.1
307.7
441.6
650.9
618.7
865.2
831.3
300
1088.4
1328.7
1609.9
(-)
410.8
1052.1
1288.7
1563.3
0.0009990
0.00101
0.00103
0.00107
0.00113
0.00121
0.00133
0.00155
251.9
202.4
354.2
304.0
500
456.8
664.1
611.0
875.4
819.7
1093.6
1323.7
1576.3
(-)
405.8
1034.3
1259.3
1504.1
0.0009911
0.00100
0.00102
0.00106
0.00111
0.00119
0.00129
0.00144
293.9
196.5
1000
394.3
495.1
698.0
903.5
1113.0
1328.7
1550.5
(-)
295.7
395.1
594.4
795.3
1207.1
999.0
1419.0
0.0009737
0.0009852
0.001000
0.00104
0.00108
0.00114
0.00122
0.00131
"Adapted from R. W. Haywood, Thermodynamic Tables in SI (Metric) Units, Cambridge University Press, London, 1968.
Water is a liquid in the enclosed region between 50°C and 350°C. ÂĤ = specific enthalpy (kJ/kg), Û = specific internal energy
(kJ/kg), V = specific volume (m/kg). Note: kJ/kg x 0.4303 = Btu/lb,-
(сontinued)
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