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某锅炉厂生产的220t/h锅炉的低温段空气预热器的设计参数为：顺排布置，s 1 =76mm，s 2 =57mm，管子外径d 0 =38mm，壁厚δ=1.5mm；空气横向冲刷管束，在空气平均温度为133℃时最大流速u max =6.03m/s，空气流动方向上的总管排数为44排。设管壁平均温度t w =165℃，求管束与空气间的对流换热系数。如将管束改为叉排，其余条件不变，则对流换热系数变为多少?
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