HP 9000 rp8440 Site Preparation Guide, Fourth Edition - HP Integrity rx8640, H - Page 40

Acoustic Noise Specification, Air Flow, 77° F at 960 CFM.

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The air-conditioning data in Table 2-11 are derived using the following equations: • Watts x (0.860) = kcal/hour • Watts x (3.414) = Btu/hour • BTU/hour divided by 12,000 = tons of refrigeration required NOTE: When determining power requirements, you must consider any peripheral equipment that will be installed during initial installation or as a later update. Refer to the applicable documentation for such devices to determine the power and air-conditioning that is required to support these devices. Acoustic Noise Specification The acoustic noise specification for the servers is 55.6 db (sound pressure level at bystander position). It is appropriate for dedicated computer room environments, not office environments. The LwA is 7.4 Bels. Care should be taken to understand the acoustic noise specifications relative to operator positions within the computer room or when adding servers to computer rooms with existing noise sources. Air Flow The recommended server cabinet air intake temperature is between 20° C and 25° C (68° F and 77° F) at 960 CFM. Figure 2-1 illustrates the location of the inlet and outlet airducts on a single cabinet. Air is drawn into the front of the server and forced out the rear. Figure 2-1 Airflow Diagram 40 System Specifications

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The air-conditioning data in
Table 2-11
are derived using the following equations:
•
Watts x (0.860) = kcal/hour
•
Watts x (3.414) = Btu/hour
•
BTU/hour divided by 12,000 = tons of refrigeration required
NOTE:
When determining power requirements, you must consider any peripheral equipment
that will be installed during initial installation or as a later update. Refer to the applicable
documentation for such devices to determine the power and air-conditioning that is required to
support these devices.
Acoustic Noise Specification
The acoustic noise specification for the servers is 55.6 db (sound pressure level at bystander
position). It is appropriate for dedicated computer room environments, not office environments.
The LwA is 7.4 Bels. Care should be taken to understand the acoustic noise specifications relative
to operator positions within the computer room or when adding servers to computer rooms with
existing noise sources.
Air Flow
The recommended server cabinet air intake temperature is between 20° C and 25° C (68° F and
77° F) at 960 CFM.
Figure 2-1
illustrates the location of the inlet and outlet airducts on a single cabinet. Air is drawn
into the front of the server and forced out the rear.
Figure 2-1 Airflow Diagram
40
System Specifications