工程热力学习题答案
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175.389 ℃;2468.99 kJ/kg;0.1828 m3/kg;5.9431 kJ/(kg·K);2304.43 kJ/kg 0.1036 m3/kg;3286.55 kJ/kg;7.001 kJ/(kg·K);2975.73 kJ/kg;191.11 ℃ 733.1 kg;4266.9 kg 0.3196 m3/kg;120.24 ℃;3.5452 kJ/(kg·K) 2.2304 m3/kg;2899.4 kJ/kg;7.8828 kJ/(kg·K);682.1 kJ 4.64×103 kW 1.028×105 kJ;20.61 MPa;1.99×104 kJ (1)过热蒸汽; (2)196.5 ℃; (3)59.15 kJ;27.3 kJ 3.05×104;2140.29 kJ 0.5 MPa;293.06 ℃;56.53 kJ (2)1.27×105 kW;421.27 kW/K; (3)-405.45 kW/K;15.82 kW/K (1)8.4×103 kg/s; (1)1167.42 kJ/kg; (2)0.6286 kJ/(kg·K) 湿蒸气;201 kPa
7-15: 37.12 kJ/kg 7-16: (1)506.57 kg/s; (2)16.19 kW/K 第八章 8-1: 14.8 ℃;0.011 kg/kg(a);53.15 kJ/kg(a) 8-2: 50.76 kg;3.34×103 kJ 8-3: 8-4: 8-5: 8-6: 8-8: 53% 34% 0.0131 kg/kg(a);65%;0.0204 kg/kg(a);0.84 kg 28.6 ℃;72%;0.018 kg/kg(a) (1)204.1 t/h;205.4 t/h; (2)2.9 t/h
0;295.4 kJ;0.568 kJ/K -4.16×103 kJ;-5.82×103 kJ;-5.82×103 kJ (1)-86.55 kJ/kg; (2)-101.67 kJ/kg 定温:p 2 =0.6 MPa,v 2 =0.149 m3/kg;W=-247.04 kJ;Q=-247.04 kJ;△U=0 多变:p 2 =0.88 MPa,v 2 =0.149 m3/kg;T 2 =442.3 K;W=-301.88 kJ;Q=-90.56 kJ;△U=211.32 kJ 162.81 m3 (1)300 K;154.27 kJ/kg;0.514 kJ/(kg·K)
9-14: 239.2 m/s 9-15: 303.7 m/s 第十章 10-1: (1)6.2 kW; (2)8.2 kW; (3)7.2 kW 10-2: (1)2.5 kW; (2)2.4 kW 10-3: 494.2 K;4.04×103 kW 10-4: 840.7 kW 10-5: 否 10-6: (1)90.4%;0.05 m3/s; (2)16.2 kW 10-7: (1)127.5 ℃; (2)1.38×103 kW 10-8: (1)0.5 MPa; (2)400.1 K; (3)56.7 kW; (4)19.8 kW; (5)67.5 kW;552.1 K (3)9.22×103 kW 10-9: (1)499.1 K; (2)8.92×104 kW; 10-10: (1)13.3 ℃; (2)18.2 kJ/kg 10-11: 17.7 ℃;22.2 kJ/kg;0.0138 kJ/(kg·K) (3)1.772 kW/K 10-12: (1)537.9 K; (2)4.58×103 kW; 3 (3)2.734 kW/K 10-13: (1)191.9 ℃; (2)6.85×10 kW; 第十一章 11-1: (1)3.4 MPa;1943 K; (2)47.5% 11-2: 973.8 kJ/kg;603.5 kJ/kg;62% 11-3: (1)435.1 kJ/kg;291.5 kJ/kg; (2)143.6 kJ/kg; (3)33%; (4)690.3 K;462.5 K 11-4: (1)p 2 =4.1 MPa;T 2 =862.1 K;v 2 =0.0608 m3/kg p 3 =4.1 MPa;T 3 =1758.5 K;v 3 =0.124 m3/kg p 4 =0.27 MPa;T 4 =813.8 K;v 4 =0.865 m3/kg (2)368.4 kJ/kg;531.6 kJ/kg; (3)59.1% 11-5: 定容:p 2 =0.12 MPa;T 2 =316.6 K;p 4 =0.5 MPa;T 4 =1490.4 K;5.3%
第九章 9-1: 9-2: 9-3: 9-4: 9-5: 9-6: 9-7: 9-8: 9-9: 9-10: 9-11: 9-12: 9-13:
473.9 m/s;7.06 cm2 602.5 m/s;2.53 kg/s 缩放喷管;c cr =702.4 m/s;c 2 =809.1 m/s (1)缩放喷管; (2)c cr =633.9 m/s;A cr =8.96 cm2;c 2 =725.7 m/s;A 2 =9.18 cm2; 临界截面:0.44 MPa;0.7108 m3/kg;403.3 ℃;634.2 m/s;67.3 cm2 出口截面:0.3 MPa;0.9509 m3/kg;348.3 ℃;791.1 m/s;72.1 cm2 临界截面:0.45 MPa;0.6996 m3/kg;406.4 ℃;635.5 m/s;66.1 cm2 出口截面:0.3 MPa;0.9509 m3/kg;348.3 ℃;800.1 m/s;71.3 cm2 281.4 kPa;1.88 kg/s 359.6 m/s;0.44 kg/s 0.0514 kJ/(kg·K) 50.1 ℃ 258.9 ℃ 渐缩喷管;453.0 m/s;1.84 cm2 337.5 m/s;0.96
3-16: 0.13 kJ/K 3-17: 35 kJ 3-18: (2) cm
TA TB
2
TA TB ; (3) cm ln
4TATB
2
第四章 4-2: 4-3: 4-4: 4-5: 4-6: 4-7: 4-8: 4-9: 4-10: 4-11: 4-12: 4-13: 4-14: 4-15: 第五章 5-3: 5-4: 5-5: 5-6: 5-8: 5-9: 0.15 kg (1)95.3℃; (2)8.2×10-3 kg 6.85 kg;0.627 MPa 1.068×105 m3/h 27.93 kg/kmol (1)612.3 kJ; (2)713.9 kJ 558 kJ/kg 285.86 kJ;400.21 kJ; 293.53 kJ;407.9 kJ -595.8 kJ;-765.9 kJ;0.322 kJ/K (1)8.14×103 kJ;1.14×104 kJ; (2)8.97×103 kJ;1.23×104 kJ; (3)8.95×103 kJ;1.22×104 kJ; (4)6.66×103 kJ;9.91×103 kJ (1)93.46 kJ/min;130.85 kJ/min;0.4503 kJ/(K·min) (2)91.58 kJ/min;129.44 kJ/min;0.446 kJ/(K·min) (1)-147.19 kJ/kg;-205.82 kJ/kg;-0.4597 kJ/kg·K (2)-150.81 kJ/kg;-209.68 kJ/kg;-0.4683 kJ/kg·K (1)441.76 kJ/kg; (2)0.04218 kJ/kg·K;12.65 kJ/kg; (3)472.04 kJ/kg 3 O 2 :7.6%;N 2 :53.6%;CO 2 :38.8%; 0.189 m /kg
《工程热力学》 (普通高等教育“十二五”规划教材,傅秦生主编)课后习题答案:
第一章: 1-3: 206.6 kPa 1-4: 0.0992 MPa 1-5: 155 kPa 1-6: (1)热量; (2)电能; (3)无能量交换 1-7: 13.5 MPa;0.00387 MPa 1-8: 185.1 mmHg;580.0 mmHg 1-9: (1)67 kPa; (2)13 kPa; (3)33 kPa; (4)333 kPa 1-10: t F =1.8t c +32;-459.67 ºF 1-11: (1)-459.67 ºR;t R =1.8T K 1-12:
2-9: 956.4 t/h 2-10: (1)2066 kJ/kg; (2)2178 kJ/kg; (3)435.6 kW 2-11: 125 kJ/kg 2-12: (1)1152 m/s; (2)652.3 kJ/kg; (3)3653 kW 2-13: 1-2:1210;2-3:-250;3-4:-980;4-1:-20;20;效率:19% 2-14: 12.7 kg/min 2-16: (1)0.093 MPa; (2)2297.3 kJ/kg 2-17: 50 kJ;-10 kJ 2-18: 30.7 ℃ 第三章: 3-1: (1)77%; (2)15.4 kW; (3)276 kJ 3-2: (1)600 K; (2)519.6 K 3-3: 不满足
W C ln
V2 V1
1-13: 1-14:
(1)
p1 v2 T v p T (2) 2 2 ; (3) 2 2 ; p2 v1 p1 T1 T1 v1
(1)30.53%
第二章: 2-1: 2-2: 2-3: 2-4: 2-5: 2-6: 2-7: 2-8: 28 kJ 压缩;50 kJ (1)0; (2)0; (3)590 kJ (1)60 kJ; (2)-73 kJ; (3)50 kJ;10 kJ 过程 1:-46; 37;过程 2:74;过程 3:38;8;过程 4:-22; 29 (1)否; (2)0;2500 kJ 2.04×105 kJ (1)9.1 MPa;3.6 kPa; (2)1199.8 kJ/kg; (3)1.33×104 kW; (4)0.017%; (5)0.67%; (6) 0.008%
Βιβλιοθήκη Baidu
(2)209.65 K;103.72 kJ/kg;0.154 kJ/(kg·K) (3)179.8 K;86.24 kJ/kg;0 kJ/(kg·K) 217.94 kJ (1)15.68 kg;270.93 K(2)7.75 MPa -26.19 kJ;26.19 kJ -18.83 kJ;37.67 kJ (1)889.7 kJ/h;152.6 kJ/kg;0.4104 kJ/(kg·K); (2)28.51 kJ/kg 是;1.2 定容过程:0 kJ;-277.5 kJ;-388.0 kJ;-0.4977 kJ/K 可逆绝热:-277.3 kJ;0 kJ;388.0 kJ;0 kJ/K 定温过程:384.6 kJ;384.6 kJ;0 kJ;0.4975 kJ/K 5-18: 1.6;-1.39×103 kJ 5-19: (1)否; (2)502 kJ; (3)16.7 kJ/kg 第六章 6-1: (1)301.7 kg; (2)455.6 kg; (3)486.5 kg 3 (2)0.0623 m3/kg;1.5% 6-2: (1)0.067 m /kg;5.3%; 3 3 6-4: 0.247 m /kg;0.242 m /kg 第七章 7-2: 7-3: 7-4: 7-5: 7-6: 7-7: 7-8: 7-9: 7-10: 7-11: 7-12: 7-13: 7-14: 5-10: 5-11: 5-13: 5-14: 5-15: 5-16: 5-17:
3-4: 3-5: 3-6: 3-7: 3-8: 3-9: 3-10: 3-12: 3-13: 3-14: 3-15:
满足 1+T L /T H (1)可能,不可逆; (2)不可能 可行,不可逆 (1)3.02 kg/min; (2)0.046 kJ/(min·K) 0.802 kJ/K 3000 kJ 57.4 kJ 90.3 kJ 0.09 kJ/(kg·K) 83.7 kJ;16.3 kJ;42.3kJ