UFC 3-240-13FN
25 May 2005
5-1.2
Closed Chilled Water Systems, Brine Systems, and Glycol Systems.
Closed chilled water systems, brine systems, and glycol systems supply cold or chilled
water for cooling processes and air conditioning. They are water systems designed for
minimal loss of water. These systems contain mild steel piping, copper heat exchangers
and, in some systems, aluminum piping, stainless steel piping, cold rolled steel piping,
and potentially other metals.
5-1.2.1
Closed Chilled Water Systems. Closed chilled water systems circulate
water that is cooled by refrigeration equipment. Water temperature ranges typically vary
between 4 to 13 C (40 to 55 F). A typical chilled water system is depicted in Figure 5-
2. Chilled water systems can have large storage capacity (3785 cubic meters
[1,000,000 gallons] or higher). Chillers are shown in Figure 5-3.
Figure 5-2. Typical Closed Chilled Water System Schematic
Surge
Tank
Chilled
Water
Chilled
Return
Water
Supply
Makeup
Water
Chiller
Circulation
Backflow
Pump
Preventer
Coils
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