ps5_hints - Assume that the cross-sectional area of the bed...

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Hints for Problem 15.26 Some of the parameters required to solve 15.26 (S&H) need to be found in the literature (e.g. Perry’s). We have provided those below to save time: 1. The concentration of water in air at 80°F, 1 atm and 80% relative humidity (from psychrometric chart) air dry lb O H lb 0.0177 2 = 2. The diffusivity of water vapor in air at 1 atm, 80°F s m 10 26 . 0 D 2 4 - i × = 3. The viscosity of air at 80 °F s m kg 10 75 . 1 5 - × = µ Additional advice: Pay attention to units throughout the problem. You can use the ideal gas law to calculate the density (in lb/ft 3 ) of the gas entering the bed, which is a mixture of water vapor and air.
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Unformatted text preview: Assume that the cross-sectional area of the bed is 1 ft 2 . Use the equation b b p 1- = to calculate p , the particle density, (lb gel/ ft 3 particles) from the density of the silica given in the problem statement 3 b ft lb 39 = and the void fraction 47 . b = . The units of the equilibrium constant, K, should be in gas ft / O H lb gel ft / O H lb 3 2 3 2 to use Equation 15-106 (S&H). If using Excel to solve the Klinkenberg equation, use erf carefully and remember that erf (-z) = - erf (z)....
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