UFC 4-133-01N
24 February 2005
Including changes 1 and 2, 7 March 2007
b. A four-pipe chilled/hot water distribution system with separate air
handlers for each zone or dehumidifying system to work in
conjunction with the air conditioning system.
c.
Capability for future expansion of the HVAC system. Use piping
designed for low friction and velocity losses at the maximum flows
expected.
d. Chilled water requirements will be provided in the SSCC FRS.
2-4.4.1
Air Conditioning.
Provide:
a. Two parallel piped air-cooled chillers, each designed for 60 percent
of the total building-cooling load. Alternate operation of chillers
automatically, on a regular basis, when load is less than 60
percent. Consider cold storage to minimize power peaks.
b. One chilled water circulation pump for each chiller plus a manifold
spare pump. Design chiller circuitry so that the pump must operate
and water flow before the chiller is energized. The spare pump
may be manually operated. Provide secondary chilled water loops
with three-way valves at coils in each circuit to result in constant
flow through chiller.
c.
Divide the building into three cooling zones: administrative areas,
operations areas, and the equipment areas. Provide separate air
handlers and ducting systems for each zone. Provide sound
attenuators for all supply ductwork. Consider more than one air
handler for large zones.
d. Provide two air handlers for the operations, and electronic
equipment/maintenance rooms. Design the air handler controls to
regulate the units as primary and secondary with each unit
alternating as the primary. Provide air handlers capable of
controlling humidity, equipped with electric heat, and specifically
designed for computer room applications. See MIL-HDBK-1012/1.
2-4.4.2
Heating.
Provide fuel oil or gas operated boiler heating system designed to accommodate
the largest heating load anticipated. Provide two circulation pumps, each
designed for 100 percent of the total building-heating load. Design the pump
controls to regulate the pumps as primary and secondary with each pump
alternating as the primary.
2-4.5
Electrical Requirements.
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