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Figure 8 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 IBM Rear Door Heat eXchanger.
Shutoff
valves
Pressure relief
Secondary side
valve (based on
temperature feedback
maximum
for controlled water
pressure
temperature to
application)
specification
T
Supply
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
Figure 8. Coolant distribution unit that uses a water chiller unit to provide conditioned water
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. See "Materials to use in secondary loops" on page 12. 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.
Chapter 2. Heat exchanger planning, specifications, and requirements
CS
Supply
Circuit setter
flow control
valves
CS
Return
Optional low
impedance
quick-connect
coupling
Flowmeter
CS
CS
FM
CS
CS
CS
Return
Distribution
manifolds
Rear door
heat exchangers
Quick-connect
couplings
Flexible hoses,
maximum length
15.24 meters (50 feet)
19
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