06-06
Include a noise analysis of the proposed cooling tower relative to
adjacent occupancies and consider alternative cooling tower
selections if necessary to meet noise level of 60 dba at 15 m (50
feet) which may be lowered for critical locations.
Consider
provisions for security and maintenance lights and receptacles.
Provide a permanent service platform and ladders for access to
cooling tower basin access doors.
E. LOUVERS:
The outside air intake and exhaust air louvers shall be
located to avoid health hazards, nuisance odors, and reduction in
capacity due to possibility of reentry of air from cooling towers,
air cooled condensers, etc.
The bottom of the intake louvers shall
be located as high as possible but not less than one meter (three
feet) above ground level.
Maximum louver velocity shall not exceed
38 m/s (75O feet per minute) through the free area of 35 percent.
For drainable louvers, maximum velocity of 510 m/s (1,000 feet per
minute) and 45 percent free area is acceptable.
F. MISCELLANEOUS:
At medical centers where cottonwood trees, or similar
types, are likely to interfere with operation of air intakes for air
handling units, cooling towers, or air cooled condensers, provide
easily cleanable screens or roughing filters at the air inlets.
8. SEISMIC REQUIREMENTS (HVAC)
8.1 GENERAL
A. Earthquake-resistive design shall comply with the requirements of
Construction Standards CD-54, Natural Disaster Resistive Design,
latest edition of VA Handbook H-08-8, Earthquake Resistant Design
Requirements for VA Hospital Facilities, and the Uniform Building
Code *UBC) published by International Conference of Building
Officials (ICBO).
B. Earthquake-resistive design for HVAC systems shall be provided where
peak horizontal ground acceleration, Amax is 0.10g or greater.
The
Amax values for VA sites are listed in VA Handbook H-08-8.
These
values must be verified with VA for a specific project before
proceeding with the design.
C. HVAC equipment, certain ductwork, and piping shall be braced in
accordance with the most current edition of Seismic Restraint Manual
Guidelines for Mechanical Systems (SMACNA) and National Uniform
Seismic Installation Guidelines (NUSIG).
D. Unless otherwise shown by SMACNA or NUSIG, provide required details
and structural calculations to completely address seismic bracing
requirements.
See paragraph 8.4 "CALCULATIONS".
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