Question

A 12-story office building is 120 ft tall with plan dimensions of 100 x 25 ft. The structure is of conventional
curtain wall construction with all windows fixed in place. There are double vestibule-type doors on all four
sides. Under winter design conditions, a wind of 20 mph blows at 45° to one of the long dimensions. The
density of the outdoor air is 0.0765 lbm/ft³. Estimate the followings:

a) Total pressure difference for the windward wall on the first floor. Consider only wind and stack effects.
The indoor-outdoor temperature difference is 60 °F. Assume draft coefficient is 0.6 and neutral pressure
level is at the fifth floor. Write down your answer in inches of water (in. wg)

(12)

b) Calculate the sensible and latent heat due to infiltration through the windward wall on the first floor if
the conditions are such that the total pressure difference for this wall is 0.06 in. wg. Consider average
fitting. Consider the temperature difference between indoor and outdoor to be 60 °F. Each side of the
double vestibule door is 4 ft by 6 ft. The indoor temperature is 70 °F and the indoor relative humidity is
30%. Consider the outdoor humidity ratio to be 0 lbmv/lbma. Note: Consider only curtain wall area
excluding the door area for calculation.

Answer 1

Answer:

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