340
Heating-Ventilating-Cooling: Design Criteria
Figure 340-5.
AIR-HANDLING-UNIT CAPACITIES
A mechanical room designed to house a 24,000 c.f.m. unit would provide
the maximum air-supply requirement quoted above of 2.4 c.f.m./square
foot to a service module of 10,000 square feet. The smaller unit rated at
12,500 c.f.m. placed in the same mechanical room would provide the
average area requirement of 1.25 c.f.m. to the same 10,000 square feet
module. As Figure 340-5 shows, it would be possible to increase the size
of the service module to 15,000 square feet, using the two larger units, but
this would leave little capability for dealing with increased future demands.
At 10,000 square feet, the largest fan unit would be also able to handle
the laundry and kitchen areas in most schemes.
Three items related to the HVC subsystem are to be considered
permanent: the mechanical room size and locations, the openings for
ducts in the shear wall in size and location, and the supply and
return/exhaust duct mains in the service zone. On the basis of a set of
load assumptions similar to those in Section 344.1 above, the maximum
size of these elements can be calculated.
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