AirPollutionHandouts5Nov - Indoor Air Quality Model Indoor...

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12/9/10 Assumptions? Steady state and Ca = 0 Volume of conditioned space in building is constant Box is completely mixed, so that concentration of pollutant is uniform in space Indoor Concentration, C Volume, V Source of pollutant Sink Decay (k) Infiltration, Q Concentratio n, Ca Ex-filtration,  Q Concentrati on, C Emission (S) Indoor Air Quality Model MASS BALANCE = [Rate of pollutant leaving] = [Rate of pollutant produced] Rate of pollutants leaving = M = C ´ a ´ V where : C = concentration of pollutant in room, mg/m 3 a = air change rate, L/hr where
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Unformatted text preview: a = Q V V = volume of enclosure, m 3 Rate of pollutant PRODUCED is called the source strength, S : and is in units of mg of pollutant emitted per hour : So from material balance (above), where [Rate of Pollutant LEAVING] = [Rate of pollutant PRODUCED] or CaV = S , then C = S aV where C is the concentration of pollutant in space and in exiting air! where C = concentration of a pollutant CE 3400/Ch 11/Fall 2010/Colberg 12/9/10 CE 3400/Ch 11/Fall 2010/Colberg...
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