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Figure 65. Coolant distribution unit that uses off-the-shelf supplier solutions
Notes: Supplier-built water chiller unit required features:
– Temperature and flow metering (monitoring)
– Leak detection or water level sensing and shutdown
– Local and remote monitoring and control
– Access port for filling and water treatment
This figure shows an example of a water chiller unit that supplies conditioned water to one or more heat
exchangers. This must be a closed system (no exposure of the water to air) and meet all materials, water
quality, water treatment, and temperature and flow specifications that are defined in this document. A
water chiller unit is considered an acceptable alternative to use as a building chilled water source for
removing heat from an Rear Door Heat eXchanger.
Manifolds and piping
Manifolds that accept large-diameter feed pipes from a pump unit are the preferred method for splitting the
flow of water to smaller-diameter pipes or hoses that are routed to individual heat exchangers. Manifolds
must be constructed of materials that are compatible with the pump unit and related piping. The manifolds
must provide enough connection points to allow a matching number of supply and return lines to be
attached, and the manifolds must match the capacity rating of the pumps and the loop heat exchanger
(between the secondary cooling loop and the building chilled-water source). Anchor or restrain all manifolds
to provide the required support to avoid movement when quick-connect couplings are connected to the
manifolds.
Example manifold supply pipe sizes
• Use a 50.8 mm (2 in.) or larger supply pipe to provide the correct flow to three 19 mm (0.75 in.) supply
hoses, with a 100 kW coolant distribution unit (CDU).
.
Chapter 3
Rack cabinet setup
59
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