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【单选题】
有两湍流液体在逆流套管换热器内换热,两流体的传热膜系数均为500 ,密度平均值为1000 ,比定压热容(平均值)为4 ,流量为0.001 ,换热面积为20 ,热流体的初始温度为120°C,冷流体初始温度为20°C,求热流体出口温度(管壁热阻可以忽略)。A.
75℃
B.
60℃
C.
61.2℃
D.
64.4℃
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