Meteorology for Air Pollution Control Engineers36

Meteorology for Air Pollution Control Engineers36 - Answer...

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Unit Conversions Using Ideal Gas Law Common units for gases: ppm, ppb, g/m3 Common units for particulates: g/m3, mg/m3 Gaseous concentrations in ppm and ppb are on a volume basis, not a mass basis

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Unit Conversions Using Ideal Gas Law Concentration in ppm = (mole fraction, volume fraction, or partial pressure) x 106 Concentration in ppb = (mole fraction, volume fraction, or partial pressure) x 109 Note: I prefer to use the notations “ppmv” and “ppbv” to clearly indicate that these are volume/volume measurements. However, this is invariably the case when dealing with airborne substances. How to convert between ppm and g/m3?
Unit Conversion Examples (a) The secondary NAAQS (National Ambient Air Quality Standard) for SO2 is 0.5 ppm. Convert the concentration to g/m3.

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Unformatted text preview: Answer: • California's air quality standard for NO2 is 470 g/m3. Express the concentration in ppm. Answer: 1310 μ g/m 3 0.21 μ g/m 3 (Click to see spreadsheet calcs) (Click on table to see spreadsheet calcs) Note: to see the calculation spreadsheet, you have to exit the show by right-clicking then select “Edit slides.” Then right-click on the answer and select “Worksheet Object…Open.” Unit Conversion Examples (cont'd) (c) An air containing 50 ppm Cl2 passes through a 10-in. duct at 250oF and 100 psig. The gas velocity is uniform at 25 ft/s. What is the emission rate of chlorine (in lb/d)? Ans: Q A = 818 acfm = 4829 scfm M A = 356.8 lb/min M Cl2 = 62.9 lb/day (Click on table to see spreadsheet calcs)...
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