已知，中压锅炉的压力p=3.9MPa，主蒸汽温度t1=450℃，给水温度tgs=150℃，已知条件列于下表。计算该压力下水蒸气热力循环过程中过热水蒸气加热过程的Pr并对计算结果进行分析与讨论。
3.9MPa锅炉的过热蒸汽特性参数
| t (℃) | u×10-6 [kg/(m·s)] | cp [kJ/(kg·K)] | λ×10-3 [W/(m·K)] | t (℃) | u×10-6 [kg/(m·s)] | cp [kJ/(kg·K)] | λ×10-3 [W/(m·K)] |
| 250 | 17.51 | 3.910 | 50.9 | 360 | 22.61 | 2.447 | 55.0 |
| 260 | 18.00 | 3.471 | 50.4 | 370 | 23.05 | 2.418 | 55.9 |
| 270 | 18.48 | 3.212 | 50.3 | 380 | 23.50 | 2.393 | 56.8 |
| 280 | 18.95 | 3.032 | 50.3 | 390 | 23.94 | 2.373 | 57.7 |
| 290 | 19.42 | 2.897 | 50.6 | 400 | 24.37 | 2.355 | 58.7 |
| 300 | 19.89 | 2.789 | 50.9 | 410 | 24.81 | 2.341 | 59.7 |
| 310 | 20.35 | 2.703 | 51.4 | 420 | 25.24 | 2.328 | 60.8 |
| 320 | 20.81 | 2.631 | 52.0 | 430 | 25.67 | 2.318 | 61.8 |
| 330 | 21.26 | 2.572 | 52.7 | 440 | 26.10 | 2.310 | 62.9 |
| 340 | 21.72 | 2.523 | 53.4 | 450 | 26.53 | 2.303 | 64.0 |
| 350 | 22.16 | 2.482 | 54.2 |
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