Meteorology for Air Pollution Control Engineers10

# Meteorology for Air Pollution Control Engineers10 - 273.15...

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1 Example 5 n Estimate the change in air density due to a 1  increase in  temperatu5e (for dry air), and a 1% increase in relative humidity,  both at 20 . n Solutions: Differentiating the natural log of Eq. (1), we find  d dM dP dT M P T ρ = + -

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2 n At constant M and P we have  n The average molecular weight of air is given by: Mavg = Ywater Mwater + (1 - Ywater) Mair        = Mair + Ywater (Mwater - Mair) where ywater is the mol fraction of water vapor. o 1 = 0.0034 (20

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Unformatted text preview: 273.15) / or 0.0034/ at 20 C o o d dT C T K d C dT ρ ρ ρ = --= -+ = -3 n At 20 ℃ ywater 0.023 RH ≈ n So that Mave 29 + 0.023 RH (18 - 29) = 29 - 0.253 RH ≈ avg avg dM 0.253 0.253 M 29 0.253 29 d dRH dRH RH ρ--= = ≈-4 n We see that about a 40% increase in relative humidity is required to produce the same effect as a 1 increase in temperature. # ℃ ( 29 5 0.253 0.01/ % / 8.7 10 / % 29 RH d RH dRH ρ ρ--= = -×...
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## This note was uploaded on 10/14/2011 for the course CIVL CIVL345 taught by Professor Hsinchu during the Spring '11 term at SUNY College of Environmental Science and Forestry.

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Meteorology for Air Pollution Control Engineers10 - 273.15...

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