=+6-8.

A 20-story office building has plan dimensions of 100 × 60 ft and is oriented at 45 degrees to a 20 mph wind. All windows are fixed in place. There are double vestibule-type swinging doors on the 60-ft walls. The walls are tight-fitting curtain wall construction, and the doors have about in. cracks.

(a) Compute the pressure differences for each wall due to wind and stack effect for the first, fifth, fifteenth, and twentieth floors. Assume t, - 1 = 40 F.

(b) Plot pressure dif-

ference versus height for each wall, and estimate which surfaces have infiltration and exfiltra-

tion.

(e) Compute the total infiltration rate for the first floor, assuming 400 people per hour per door,

(d) Compute the infiltration rate for the fifteenth floor.

(e) Compute the infiltration rate for the twentieth floor. Neglect any leakage through the roof.