Problem Set 7

Problem Set 7 CEE 320 – Environmental Engineering Department of Civil and Environmental Engineering University of Wisconsin – Madison Summer 2021 Due at 8:00 am on Monday, August 2 Complete the following problems in Masten & Davis, 4th Edition: 1. Problem 12 ‐ 1 16 points This problem is referring to Figure 12 ‐ 13, not to Figure 12 ‐ 15. 2. Problem 12 ‐ 4 6 points 3. Problem 12 ‐ 5 6 points 4. Problem 12 ‐ 7 4 points 5. Problem 12 ‐ 8 4 points 6. Problem 12 ‐ 10 3 points 7. Problem 12 ‐ 12 7 points 8. Problem 12 ‐ 13 12 points For this problem, no height to an inversion layer is given, so we can proceed much like we would for Problem 12 ‐ 11 (see solution posted on Canvas) or for Example 12 ‐ 4 in the textbook. 9. Problem 12 ‐ 14 33 points Make sure you include a process flow diagram for this problem. Assume the stack is 10 m tall (units were not given in the problem statement) and the workspace is 5 m in height. Also assume the system is at steady state. Remember that ppm concentrations in the gas phase are on a molar basis and not a mass basis. Assume standard temperature and pressure in the facility. Give your answer in units of m 3 /min. 10. Problem 12 ‐ 15 20 points Provide a process flow diagram as part of your answer. Assume the system is at steady state and assume none of the radon accumulates on the first floor. Give your answer in units of pCi/L and state whether your estimate exceeds the standard or not. 11. Problem 12 ‐ 17 15 points Problem 12 ‐ 16 has been worked as an example – see the example solutions provided on Canvas. 12. Problem 12 ‐ 18 22 points No process flow diagram is needed. In addition to estimating the concentration, compare your estimate with the estimate in Example 12 ‐ 4 and state why your estimate is or isn’t consistent with expectations. 13. Problem 12 ‐ 19 22 points No process flow diagram is needed. You will want to look through Example 12 ‐ 5 as you rework Example 12 ‐ 4 for this problem. In Example 12 ‐ 5, there is a typographical error. It says “using Figure 12 ‐ 25, find X L .” This should say Figure 12 ‐ 24 instead of Figure 12 ‐ 25. In addition to estimating the concentration, compare your estimate with the estimate in Example 12 ‐ 4 and state why your estimate is or isn’t consistent with expectations. 14. Please tell us how many total hours of effort it took to complete this assignment, including time spent reading from the text and other materials, time spent watching videos, time spent working example problems, and time spent working the problems on the problem set. This is worth 5 points and will be graded on honestly answering the question, not on the number of hours you claim. The points available for each problem are noted above. Your grade for each assignment will be based on the percentage of total points you received. For this problem set, there are 175 points available (points are set to help with grading and are not consistent with number of minutes needed to solve the problem). If you receive 160 of the 175 points, your score for this assignment would be 91.4%. For each problem that requires a mass balance analysis, your solution should contain a properly prepared process flow diagram in addition to the necessary calculations. As with previous problem sets, solutions to example problems are posted on the Canvas site. Please write your solutions neatly, scan the pages, convert the scanned pages to a single pdf file, and upload the pdf file to the dropbox on the Canvas site. Make sure you show your work so that you can get the most partial credit possible. Some example solutions are posted on the Canvas site so that you can get a taste of what is meant by "show your work." You are welcome to work with others taking the class while completing the assignment. However, you are not permitted to submit the work of another person for this or any other assignment in this class.