It is found that the overall heat transfer will be increased if there are more heat transfer area in the diagonal region starting from the crosspoint of two streams for crossflow heat exchanger.

• 在维持总传热面积不变的条件下,于叉流换热器冷热流体相交点区域,及由该点所在对角线从两侧往对角线中心区域增加局部传热面积,可改善温差场的均匀程度,从而提高效能。