A small office building has a volume of about 50,000 ft3. If the forced ventilat

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A small office building has a volume of about 50,000 ft3. If the forced ventilation rate if 0.5 air change per hour (ACH) and there are 30 occupants who give off 0.01 ft3 of CO2 per minute, how does the CO2 concentration vary throughout the day? Draw a graph from 8 a.m. to 5 p.m. showing the concentration, assuming an ambient concentration of 350 ppm of CO2 and an initial building concentration of the same amount. Ignore any infiltration effects, and assume that the building air is thoroughly mixed. (8)

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