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【单选题】
当换热器中冷热流体的进出口温度一定时，判断下面的说法中哪一个是错误的( )。A.
逆流时，△tm一定大于并流、错流或折流时的△tm
B.
采用逆流操作时可以节约热流体(或冷流体)的用量
C.
采用逆流操作可以减少所需的传热面积
D.
温差修正系数φ的大小反映了流体流向接近逆流的程度
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