Problem
A CSTR box model can be useful in estimating pollutant deposition onto indoor surfaces.
(a) Consider a living room of total volume V and total internal surface area A onto which ozone deposition occurs. Let Vd represent the deposition velocity; it is defined as the ratio of the flux to the surface (μg/m2 s) to the average concentration in air (μg/m3). Outside air with ozone concentration Co exchanges with the indoor air through vents at a known rate Rexc. At steady state what will be the value of Vd for 75% deposition of ozone in a room that is 5 m × 5 m × 2.5 m, if Rexc = 5 L/min and Co = 75 ppb? Experimental values range from 0.001 to 0.2 cm/s. What are the possible sources of such wide distributions in experimental values?
(b) A home near a chemical plant has a total internal volume of 300 m3. The normal air exchange between the indoor and outdoor occurs at a rate of 0.1 h-1.An episodic release of a chlorinated compound (1,1,1- trichloroethane, TCA) occurred from the plant. The concentration of TCA was 50 ppbv in the released air. If the normal background concentration of TCA is 10 ppbv, how long will it take before the concentration inside the room reaches a steady-state value?
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.