Anew type of cooling-tower packing is being tested in a laboratory column. At two points in the column, 0.7 ft apart, the following data have been taken. Calculate the overall volumetric mass-transfer coefficient Kya that can be used to design a large, packed-bed cooling tower, where a is the mass-transfer area, A, per unit volume, V, oftower.

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Top Bottom Water temperature, "F Water vapor pressure. psia Mole fraction H,0 in air Total pressure, psia 120 126 1.69 1.995 0.001 609 0.0882 14.1 14.3 Air rate, Ibmol/h 0.401 0.401 Column area, ft? Water rate. Ibmol/h (approximate) 0.5 20 0.5 20