# Air Pollution Questionnaire

Air Pollution Questionnaire

Air Pollution Questionnaire.

ME 401/5501 Spring 2020 FINAL EXAM Name ​_______ 1​ ​In Duct A, The gas flow rate is 5000 SCFM (standard cubic feet per minute), the gas temperature is 350 F and the pressure is -32 inches of water.

In-Duct B, the gas flow rate is 4000 ACFM (actual cubic feet per minute), the temperature is 400 F and the pressure is -35 inches of water. Calculate the total gas flow rate in Duct C where the two flows combine. Use a barometric pressure of 29.92 inches of Hg.

## Downwind distance​ = __________m crosswind distance​ = ____________m

Duct C gas flow rate = SCFM K= L = Version 20200422 M= N= ME 401/5501 Final Exam Spring 2020 2​page 2​For your student-specific values, find ​downwind​ and ​crosswind​ dis​tance between source and receptor: Downwind distance​ = __________m Crosswind distance​ = ____________m Use the gaussian dispersion model to estimate ground-level concentration on an overcast day if i)the source emits 100 g/s ii)the effective stack height is 37 m iii)the wind speed is 3.7 m/s Concentration in ug/m3 USE THE FOLLOWING PARAMETERIZATIONS FOR ​𝜎​y​ AND ​𝜎​Z Version 20200422 ME 401/5501 Final Exam Spring 2020 3 ​Shown to the right are sampling results upstream and downstream of an air pollution control device. All measurements are at actual (i.e., rather than standard) conditions, with concentration values (in mg/m​3​) shown in ​bold​ and gas velocity (in feet per minute) shown in ​italics​. Find the emission rate through the upstream and downstream cross-sections.

What is the control efficiency for the control device? The sampling subarea (for each of the 56 areas in both tables) is ​0.L x 0.M​ square meters, where​ ​L​ ​and​ ​M depend on your student ID number.* Upstream emission rate lb/hr Downstream emission rate lb/hr Control Efficiency Version 20200422 Upstream 42 43 68 31 64 32 57 73 857 1169 1338 1508 1572 1314 1119 984 65 35 46 59 74 73 26 70 1130 1321 1517 1074 1219 1014 1183 1227 55 60 63 46 35 54 73 33 842 1184 1558 1234 914 894 1570 1337 53 71 74 36 73 74 56 67 928 1311 999 1441 1331 1449 817 992 40 71 35 31 64 29 27 35 894 1408 1546 1542 855 1546 1409 1451 61 59 43 34 43 50 47 59 1238 879 1551 1104 1039 1406 922 1540 41 68 29 43 40 72 64 61 1378 1579 1037 1242 1001 1305 1136 1491 Downstream % *​​For example, if ​KLMN​ is ​4983​, this would be 0.9 x 0.8 = 0.72 sq m page 3 16.5 10.6 9.3 12.2 8.5 17 13.5 12.8 1270 1316 1521 847 1346 1552 805 803 10.9 9.2 13.7 10.8 12.6 15.2 12.9 12.8 1036 1088 886 869 1040 917 1212 1231 15.2 12.4 12 16.1 11.8 16.5 8.4 13.5 1375 835 914 1377 1556 1108 1155 874 9.8 9.1 15.7 15.4 15.2 10.1 13.4 16.6 1543 1561 836 1512 1157 1202 1386 1160 7.6 13.7 15.8 11.6 8.4 13.6 12.2 11.0 1013 1486 1170 1459 1527 1179 962 1184 16.7 10.6 12.4 16.7 10.9 7.7 15 8.4 1102 1097 972 1474 1221 1533 895 1412 14.6 16.4 11.9 17.5 15 10.1 14.3 9.6 1285 1370 1406 932 1216 1466 1363 909