Analysis and Estimation of Molar Flow Rate in a Humidification Process: Degree-of-Freedom and Discrepancy Evaluation

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Analysis and Estimation of Molar Flow Rate in a Humidification Process: Degree-of-Freedom and Discrepancy EvaluationA stream of humid air containing 1.00 mole% H2O(v) and the balance dry air is to be humidifiedtoa water content of 10.0 mole% H2O. For this purpose, liquid water is fed through a flowmeterandevaporated into the air stream. The flowmeter reading, R, is 95. The only availablecalibration datafor the flowmeter are two points scribbled on a sheet of paper, indicating thatreadings R = 15 andR = 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 thedegree-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 desired10%. List as many possible reasons as you can think of for the discrepancy, concentrating onassumptions made in the calculation of part (a) that might be violated in the real process.SOLUTION

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