49049: Air and Noise Pollution - University of Technology Sydney - Engineering Assessment Answer

Subject Code: 49049

Engineering Assessment Answer

Assignment Code: 49049 Question 1: An incorrectly adjusted lawnmower running on petrol (C₈H₁₈) is operating in a garage. The garage dimensions are 5 × 3 × 3 m. The unbalanced chemical equation for the combustion of petrol is: C₈H₁₈ +O₂ ? CO + H₂O. After balancing this chemical equation, calculate how many grams of petrol must be burned to raise the level of CO in the air from an ambient concentration of 0 ppm to 1000 ppm by volume at standard temperature and pressure (T = 273.15 K, p = 10⁵ Pa). Question 2:  A stack with a height of 50 m emits 20 gs^-1 of NO₂. Plume rise is negligible. The wind speed is 2.5 ms^-1. Stability class is C and the terrain is rural. What is the downwind concentration 2 km from the source? Make a plot of the downwind NO₂ concentration at ground level as a function of distance from the stack. You can use software such as Microsoft Excel or Matlab to make the plot Question 3: Describe at least two (2) noise control approaches that could be used for the industrial facility shown below. Question 4: In an Australian timber mill, an employee cuts timber to length with a cut-off saw. While the saw idles, it produces a noise level of 80 dB(A) and when it cuts timber it produces a noise level of 98 dB(A). If the saw runs continuously and only cuts for 20% of the time that it is switched on, compute the 8-hour normalised A-weighted Equivalent Continuous Noise Level. By how much must the noise exposure be reduced in hours to comply with the 90 dB(A) criterion (the 8-hour normalised A-weighted Equivalent Continuous Noise Level)?

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