HP Integrity rx8640 Site Preparation Guide, Third Edition - HP Integrity rx864 - Page 29

Standby Cooling, Typical Power Dissipation and Cooling, Acoustic Noise Specification, Air Flow

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ventilation and to help reduce the localized airflow dead spots that typically occur at the faceplate tail of each PCI card. Standby Cooling Several components within the chassis consume significant amounts of power while the system is in standby mode. The fans within the power supply operate at full speed during standby. Typical Power Dissipation and Cooling Table 2-7 provides calculations for configurations exactly as described in the table. Table 2-7 Typical SEU Power Dissipation and Cooling PCI Cards (Maximum 25W) Qty 16 8 8 DVDs Qty 1 1 0 Hard Disk Drives Qty 4 2 1 Core I/O Bulk Power Supplies Qty Qty 2 2 2 2 1 2 Typical Power Watts 564 444 394 Typical Cooling BTUs/Hour 1925 1516 1345 The air conditioning data in Table 2-7 is 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 SEU is 57.1 db (sound pressure level at bystander position) when connected to the HP Integrity rx8640 server as the host system. 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 SEU requires that the cabinet air intake temperature be between 68° F and 77° F (20° C and 25° C) at 150 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 SEU and forced out the rear. Environmental Specifications 29

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ventilation and to help reduce the localized airflow dead spots that typically occur at the faceplate
tail of each PCI card.
Standby Cooling
Several components within the chassis consume significant amounts of power while the system
is in standby mode. The fans within the power supply operate at full speed during standby.
Typical Power Dissipation and Cooling
Table 2-7
provides calculations for configurations exactly as described in the table.
Table 2-7 Typical SEU Power Dissipation and Cooling
Typical Cooling
Typical
Power
Bulk Power
Supplies
Core I/O
Hard Disk
Drives
DVDs
PCI Cards (Maximum
25W)
BTUs/Hour
Watts
Qty
Qty
Qty
Qty
Qty
1925
564
2
2
4
1
16
1516
444
2
2
2
1
8
1345
394
2
1
1
0
8
The air conditioning data in
Table 2-7
is 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 SEU is 57.1 db (sound pressure level at bystander position)
when connected to the HP Integrity rx8640 server as the host system. 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 SEU requires that the cabinet air intake temperature be between 68° F and 77° F (20° C and
25° C) at 150 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 SEU and forced out the rear.
Environmental Specifications
29