A hygrometer, which measures the amount of moisture in a

Chapter 2, Problem 2.32

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A hygrometer, which measures the amount of moisture in a gas stream, is to be calibrated using the apparatus shown here: Student Workbook Hygrometer Rotameters Water \fl- -_I---"""LJ E",,,,,,,, 37 Steam and dry air are fed at known flow rates and mixed to form a gas stream with a known water content, and the hygrometer reading is recorded; the flow rate of either the water or the air is changed to produce a stream with a different water content and the new reading is recorded. and so on. The following data are taken: Mass Fraction of Water. y 0.011 0.044 0.083 0.126 0.170 Hygrometer Reading, R 5 20 40 60 80 (a) Draw a calibration curve and determine an equation for .v(R). (b) Suppose a sample of a stack gas is inserted in the sample chamber of the hygrometer and a reading of R = 43 is obtained. If the mass flow rate of the stack gas is 1200 kg/h, what is the mass flow rate of water vapor in the gas?