7.5

An HVAC system is being designed to serve the interior and

exterior zones of a small office building. The design

occupancy is 25 for the interior zone and 40 for the exterior

zone. The ambient design condition is 95 F and 70% relative

humidity. The circulation flow rates are 4,000 cfm and 8,000

cfm for the interior and exterior zones, respectively.

a.

Specify the minimum and maximum zone setpoint

temperatures that you would use in designing the system.

Assume that the zone humidity will be about 50%.

b.

Determine the necessary ventilation airflow rates for the

system and for each zone.

C.

Determine the ventilation load for the two levels of zone

set temperature selected in b.

d. Draw some conclusions from your analysis.