=+4.32 A classroom with a capacity of 225 people is isolated from the outdoors except for the incom-

ing ventilation air. The cooling load is 125,000 Btu/hr (37 kW) with a sensible heat factor of 0.7. The minimum 15 cfm/person (7,5 L/s per person) is assumed adequate,

(a) Compute the required amount of ventilation air (supply air) on the basis of the cooling load, assuming that the space dry bulb is 75 F (24 C) and 50 percent relative humidity and that the air is supplied at 90 percent relative humidity (RH)