Table 1-7 Air Density Correction Factors
Elevation (Feet)
ADR
2000
0.944
4000
0.890
6000
0.838
1.6.3 DENSITY CORRECTIONS
The density corrections to various parameters is applied as follows:
(a) CFM1 = Standard CFM at 0.075 density
CFM2 = Actual CFM at Elevation
= CFM1
ADR
(b) Coil Face Area = CFM2_______________
Face Velocity
(c) Air Friction Thru Equipment = Catalog Air Friction CFM1
ADR
(d) Air Friction Thru Ductwork
= Air Friction at CFM1
ADR
(e) Fan Total Static Pressure = SP2 for Equipment + SP2 Ductwork +
System Effect; System Effect is defined as losses due to fan inlet and
outlet conditions and obstructions due to bearings, supports, etc.
(f) Fan RPM at actual conditions is to be obtained at SP2 and CFM2 on
the fan curve.
(g) Actual BHP absorbed is at CFM2 and SP2.
(h) The air density ratio and elevation should be noted on the
equipment schedule together with actual CFM, SP, RPM, and BHP.
1.7
EQUIPMENT LOCATION AND INSTALLATION
1.7.1 GENERAL
Equipment shall be located to be accessible for installation, operation
and repair. Mechanical spaces shall be of suitable size to permit
inspection and access for maintenance, and to provide space for future
equipment when required. The effect that equipment noise or vibration
might have on areas adjacent to, above, and below equipment shall be
considered. Location of equipment remote from sound sensitive areas
should be emphasized. Design shall comply with specified room sound
ratings.
1.7.2 HVAC EQUIPMENT
Air handling units and similar equipment shall be housed in a
mechanical equipment room or in a mechanical penthouse building.
Penthouse type of fully weatherized roof top units constructed in
standard sections of modules would be acceptable in lieu of the
mechanical equipment rooms or mechanical penthouses. These units shall
HVAC DESIGN MANUAL
1-24
GENERAL REQUIREMENTS
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