A cooling-tower packing was tested in a small column. At two points in the column, 0.7 ft apart, the data below apply. Calculate the overall volumetric mass-transfer coefficient K_ya that can be used to design a large, packed-bed cooling tower, where a is the masstransfer area, A, per unit volume, V, of tower.

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Water temperature, °F Water vapor pressure, psia Mole fraction H₂O in air Total pressure, psia Air rate, lbmol/h Column cross-sectional area, ft² Water rate, lbmol/h (approximation) Bottom 120 1.69 0.001609 14.1 0.401 0.5 20 Top 126 1.995 0.0882 14.3 0.401 0.5 20