Analysis and Estimation of Molar Flow Rate in a Humidification Process: Degree-of-Freedom and Discrepancy Evaluation
Analyzes molar flow rate in a humidification process.
Emma Thompson
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Analysis and Estimation of Molar Flow Rate in a Humidification Process: Degree-of-
Freedom and Discrepancy Evaluation
A stream of humid air containing 1.00 mole% H2O (v) and the balance dry air is to be humidified
to a water content of 10.0 mole% H2O. For this purpose, liquid water is fed through a flow meter
and evaporated into the air stream. The flow meter reading, R, is 95. The only available
calibration data for the flow meter are two points scribbled on a sheet of paper, indicating that
readings R = 15 and R = 50 correspond to flow rates V = 400 ft3/h and V = 96.9 ft3/h.
respectively.
(a) Assuming that the process is working as intended, draw and label the flowchart, do the
degree-of-freedom analysis, and estimate the molar flow rate (lb-mole/h) of the humidified
(outlet) air.
(b) Suppose the outlet air is analyzed and found to contain only 7% water instead of the desired
10%. List as many possible reasons as you can think of for the discrepancy, concentrating on
assumptions made in the calculation of part (a) that might be violated in the real process.
SOLUTION
Freedom and Discrepancy Evaluation
A stream of humid air containing 1.00 mole% H2O (v) and the balance dry air is to be humidified
to a water content of 10.0 mole% H2O. For this purpose, liquid water is fed through a flow meter
and evaporated into the air stream. The flow meter reading, R, is 95. The only available
calibration data for the flow meter are two points scribbled on a sheet of paper, indicating that
readings R = 15 and R = 50 correspond to flow rates V = 400 ft3/h and V = 96.9 ft3/h.
respectively.
(a) Assuming that the process is working as intended, draw and label the flowchart, do the
degree-of-freedom analysis, and estimate the molar flow rate (lb-mole/h) of the humidified
(outlet) air.
(b) Suppose the outlet air is analyzed and found to contain only 7% water instead of the desired
10%. List as many possible reasons as you can think of for the discrepancy, concentrating on
assumptions made in the calculation of part (a) that might be violated in the real process.
SOLUTION
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Subject
Chemistry