IBM 9835-415, Руководство по развертыванию

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Water delivery specifications for secondary loops
The delivery system for the secondary cooling loop provides chilled water to the
rear-door heat exchanger. The delivery system includes pipes, hoses, and the
required connection hardware to connect to the heat exchanger. This information
provides examples for setting up the secondary cooling loop and operating
characteristics that are needed to provide an adequate, safe supply of water to the
heat exchanger.
The primary cooling loop is considered to be the building chilled-water supply or a
modular chiller unit. The primary cooling loop must not be used as a direct source
of coolant for the heat exchanger for the following reasons:
v If the supply water temperature is below the room dew point, condensation
forms and causes dripping from the door components.
v
If a leak develops in the door, supply hose, or return hose, a large amount of
water is available.
Procurement and installation of the components that are needed to create the
secondary cooling loop system are required for this design and are your
responsibility. See “Secondary cooling loop parts and services information” on
page 57 for information about suppliers of hoses and cooling distribution units.
Attention:
The overpressure safety device must meet the following requirements:
v Comply with ISO 4126-1. For more information, go to the ANSI Standards Store
website (webstore.ansi.org/default.aspx), and search on document number ISO
4126–1.
v Be installed so that it is easily accessed for inspection, maintenance, and repair.
v Be connected as close as possible to the device that it is intended to protect.
v
Be adjustable only with the use of a tool.
v Have a discharge opening that is directed so that discharged water or fluid does
not create a hazard or directed toward any person.
v Be of adequate discharge capacity to ensure that the maximum working pressure
is not exceeded.
v Be installed without a shutoff valve between the overpressure safety device and
the protected device.
Figure 19 on page 48 shows a typical cooling solution and identifies the
components of the primary cooling loop and secondary cooling loop.
Figure 18 on page 47 shows an example of a fabricated facilities solution. The
actual number of heat exchangers that are connected to a secondary loop depends
on the capacity of the cooling distribution unit that is running the secondary loop.
Figure 16 on page 45 shows an example of an off-the-shelf modular cooling
distribution unit. The actual number of heat exchangers that are connected to a
secondary loop depends on the capacity of the cooling distribution unit that is
running the secondary loop.
Figure 17 on page 46 shows an example of a water-chiller unit that supplies
conditioned water to one or more heat exchangers. This water-chiller unit 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
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IBM FlashSystem A9000R Models 9835-415 and 9837-415 Deployment Guide