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【简答题】
在一单程管壳式换热器中,用饱和蒸汽加热原料油。温度为 160 °C的饱和蒸汽在壳程冷凝(排出饱和液体),原料油在流动,并由 20 °C加热到 106 °C。管壳式换热器尺寸为:列管直径φ 19mm × 2mm 、管长 4m ,共有 25 根管子。若换热器的传热量为 125kW ,蒸汽冷换热系数为 7000 W / ( m2·°C ) ,油侧污垢热阻可取为 0.0005 m2·°C/ W ,热阻和蒸汽侧垢层热阻可忽略,试求管内油侧对流 传热系数。又若油的流速增加一倍,此时若传热器的总传热系数为原来总传热系数的 1.75 倍,试求油的出口温度。假设油的物性不变。
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