Bonus HW Assignment - ChE205

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University of Notre Dame *

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221

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Industrial Engineering

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Dec 6, 2023

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Bonus HW Assignment: Katie Huang HW 5, Problem 2 (5.35) & HW 4, Problem 3 (4.87) HW 5, Problem 2 (5.35) My team did not get full points on Homework 5, Problem 2 mostly due to our wrong calculations. Errors were made in the beginning of the calculation, and it carried on throughout the problem, causing our team to lose points. Specifically, the air required to dilute was carried out incorrectly, as we forgot to use the flammability percentage correctly (divided instead of multiplied; equation was not set up properly). Also, when calculating the ratio of flow rates, using the wrong number from the diluted air hurt our calculation for the ratio and the mole percentage of pentane. We struggled with the problem due to not being able to use the information presented in the problem statement, as well as neglecting useful information like STP and flammability percentages to carry out our calculations. The original solution is attached below. For the new homework solution to this problem, I utilized the information presented in the problem statement. In comparison to the original solution, I used the flammability limit from the problem of 2.3% and 4.03% to calculate diluted air, which I did not do in the original. Also, I used STP conditions to help me solve part c so I can use the density to help calculate the ratio easier (the ratio used cubic meters). I also considered using the ideal gas law without STP again, which would work I believe, if I just had used the correct units and masses. I would explain this concept to the student by emphasizing using information given in the problem and using that to start your problem solving. Also, since this is a combustion problem, don ’ t forget to utilize the air composition and molar ratios to your advantage. Since the gas is in an ideal state, one can either use the ideal gas law or other STP calculations to solve
for the requested information (such as flow rates of hydrocarbons). The information listed can greatly help when dealing with combustion. From this process, I learned that I need to need thoroughly and use the information given in the problem statement whenever possible, if it applies, of course. I also need to make sure I am applying the constraints into my problem solving (like the flammability limit) because that will greatly change my air molar flow rate calculations. Overall, I need to take the problem slowly and one step at a time, so I don ’ t skip over any pertinent information. Attached below is the new solution.
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