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Figure 10 shows an extended manifold layout.
Figure 10. Typical extended manifold (along aisles between racks)
Flexible hoses and connections to manifolds and heat exchangers: Pipe and
hose configurations can vary. You can determine the best configuration for your
installation by analyzing the needs of your facilities, or a site preparation
representative can provide this analysis.
Flexible hoses are needed to supply and return water between your hard plumbing
(manifolds and coolant distribution units) and the heat exchanger (allowing needed
movement for opening and closing the rack rear door).
Hoses are available that provide water with acceptable pressure-drop
characteristics and that help prevent depletion of some corrosion inhibitors. These
hoses must be made of peroxide-cured ethylene propylene diene monomer (EPDM)
rubber, non-metal oxide material and must have Parker Fluid Connectors
quick-connect couplings at one end which are attached to the heat exchanger, and
must either have a low impedance quick connect coupling or nothing so as to
attach to a barb at the other end. The Parker couplings are described in this section
and are compatible with the heat exchanger couplings. Hose lengths from 3 to 15
meters (10 to 50 ft), in increments of 3 meters (10 ft), are available. Hoses that are
longer than 15 meters (50 ft) might create unacceptable pressure loss in the
secondary circuit and reduce the water flow, reducing the heat removal capabilities
of the heat exchanger. .
For information about a supplier of these hoses, see "Secondary cooling loop parts
and services" on page 10. Use solid piping or tubing that has a minimum inner
diameter of 19 mm (0.75 in.) and the fewest possible joints between a manifold and
a heat exchanger in each secondary loop.
21
Chapter 2. Heat exchanger planning, specifications, and requirements
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