UFC 4-133-01N
24 February 2005
2-5.3.11
Windows.
The use of window wall system could be used in the tower structure that has the
capability to have other elements, such as louvers and metal panels completely
interchangeable with glazing sections. Provide window walls on at least two
sides of the tower (stairwell side is optional). This will allow both supply and
return for HVAC equipment located within the floor from separate sides. If
windows are used, maintenance and cleaning should be considered.
Unless wind design requirements dictate greater thickness, provide tower cab
with 25.4 mm (1 in.) laminated glass that is composed of two layers of annealed
glass with a clear plastic interlayer. Provide units with a light transmissivity of not
less than 84 percent, heat transmission (U-value) of 1.00 maximum, and free of
parallax or other optical distortion. Provide window shades for the tower cab
windows. Refer to FAA Specification FAA-E-2470, Transparent Plastic Window
Shades.
2-5.4
Mechanical Requirements.
Design the mechanical system to meet the criteria as follows:
a. The tower cab and the supporting electronics areas will be
considered essential spaces. The HVAC criteria will be as follows.
Winter indoor design temperature = 20 o C (68 o F)
Summer indoor design temperature = 21 o C (70 o F)
Cooling control set point = 24 o C (75 o F)
Humidification set point = 40%
Dehumidification set point = 50%
Noise Criteria = The tower cab should be 25 or less. The
Electronic equipment rooms can be 45.
b. ATCT cab HVAC distribution: The distribution will be continuous
under the window diffuser system. The duct system will be low
noise with a max static resistance of 21.17 Pa per 30.5 m (0.085 in
of water per 100 linear ft). The duct routing will be under the
access floor and coordinated with electrical and equipment wiring
routes. Access in the base of the structural columns is critical for
installing antenna cables. Diffusers will be floor grade linear type,
located at the base of the windows providing an even coverage of
glazing preventing condensation and drafts. Duct system will be
coordinated with the structure, electrical, SPAWAR, and the control
cabinet sizes and proximity to the window.
18
Previous Page
