IBM 9835-415, Руководство по развертыванию

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Preparing your site to provide water to the rear-door heat
exchanger
You must prepare your site to provide water to the rear-door heat exchanger
before the rack can be installed.
The following requirements must be met before the rear-door heat exchanger can
be installed:
v Provide chilled, conditioned water that meets the specifications.
v Procure and install the water supply system that is suitable for your data center.
v Provide a redundant secondary-cooling-loop water supply or enough room air
conditioning to handle a tolerable heat load if the function of one or more of the
heat exchangers is compromised. If the rear door is opened for rack maintenance
or if conditioned water supply to the door is stopped, the rack heat load is sent
into the room and must be handled by room air conditioning until the
conditioned water supply is restored.
v Provide floor or ceiling tile cutouts or protective coverings to avoid tripping
hazards on non-raised floors as part of hose management.
This information can be found in the following sections:
v “Water specifications for the secondary cooling loop” on page 42
v “Water delivery specifications for secondary loops” on page 44
v
“Raised floor hose requirements and management” on page 51
v “Non-raised floor hose requirements and management” on page 55
Figure 15. Typical performance of a rear-door heat exchanger, 20 kW heat load. Percentage heat removal as function
of water temperature and flow rate. (24°C (75.2 °F) rack inlet air, 20 kW rack load, 1530 cfm air through the rear-door
heat exchanger)
Chapter 4. Physical installation site requirements
41