A hygrometer, which measures the amount of moisture in a gas stream, is to be calibrated using the apparatus shown here:
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 | Hygrometer Reading, R |
0.011 | 5 |
0.044 | 20 |
0.083 | 40 |
0.126 | 60 |
0.170 | 80 |
- Draw a calibration curse and determine an equation for y(R).
- 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?
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