The condensation heat transfer coefficient for the tubes will be the highest for the case of
horizontal side by side (case b) since (1) for long tubes, the horizontal position gives the highest heat
transfer coefficients, and (2) for tubes in a vertical tier, the average thickness of the liquid film at the lower
tubes is much larger as a result of condensate falling on top of them from the tubes directly above, and thus
the average heat transfer coefficient at the lower tubes in such arrangements is smaller.
(a)vertical. (b)horizontal side by side. (c)horizontal but in a vertical tier(directly on top of each other). (d)a horizontal stack of two tubes high and two tubes wide?