HP Integrity rx7620 Server - User Service Guide, Sixth Edition

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 with 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. Perforation is provided between the PCI bulkheads to enable 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 run at 1541 rpm, or 38% of full speed, during standby to
remove the resulting heat from the cabinet. The fans within the power supply operate at full
speed during standby.
Typical Power Dissipation and Cooling
Table B-5 Typical HP Integrity rx7620 Server Configurations
Typical
Cooling
Typical
Power
Bulk Power
Supplies
Core I/OHard Disk
Drives
DVDsPCI Cards
(assumes 10
watts each)
Memory Per
Cell Board
Cell
Boards
BTU/hrWattsQtyQtyQtyQtyQtyGBytesQty
6930.422030224216162
5916.4617332220882
5728.6916782220842
3574.4610472110841
The air conditioning data 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. 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 HP Integrity rx7620 Server is 57.3 db (sound pressure
level at bystander position) It is appropriate for dedicated computer room environments but not
office environments. The LwA is 7.5 Bels. Be sure 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.
Airflow
The HP Integrity rx7620 Server requires that the cabinet air intake temperature be between 68°
and 77° F (20° and 25° C) at 960 CFM.
Figure B-1 illustrates the location of the inlet and outlet airducts on a single cabinet.
178 System Specifications