HP Integrity rx8640, HP 9000 rp8440 Server User Service Guide

Bulk Power Supply Cooling
Cooling for the bulk power supplies (BPS) is provided by two 60-mm fans contained within each
BPS. Air flows into the front of the BPS and is exhausted out of the top of the power supply though
upward facing vents near the rear of the supply. The air is then ducted out of the rear of the chassis.
PCI/Mass Storage Section Cooling
Six 92-mm fans located between the mass storage devices and the PCI card cage provide airflow
through these devices. The PCI fans are powered off of housekeeping power and run at full speed
at all times. The air is pulled through the mass storage devices and pushed through the PCI card
cage. Separation is provided between the PCI bulkheads to allow adequate exhaust 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 system fans will run at a portion of full speed during standby to remove the
resulting heat from the cabinet. The fans within the power supply will operate at full speed during
standby.
Typical Power Dissipation and Cooling
Table 18 provides calculations for configurations as described in the table.
Table 18 Typical HP Integrity rx8640 Server Configurations
Typical
Cooling
Typical
Power
Bulk Power
Supplies
Core
I/O
Hard Disk
Drives
DVDsPCI Cards
(assumes 10W
each)
Memory
per Cell
Board
Cell
Board
BTU/hrWattsQtyQtyQtyQtyQtyGBytesQty
132573883624216324
123833627624216164
1167234196220884
93852749424216322
8402246142208162
818323974220882
646318933110881
The air-conditioning data in Table 18 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. See 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
Environmental Specifications 31