HP Integrity rx7640 and HP 9000 rp7440 Servers User Service Guide

Non-Operating Environment
The system is designed to withstand ambient temperatures between -40° to 70° C (-40° to 158°)
under non-operating conditions.
Cooling
Internal Chassis Cooling
The cabinet incorporates front-to-back airflow across the cell boards and system backplane. Two
150 mm fans, mounted externally on the front chassis wall behind the cosmetic front bezel, push
air into the cell section. Two 150 mm fans housed in cosmetic plastic fan carriers, mounted externally
to the rear chassis wall, pull air through the cell section.
Each fan is controlled by a smart fan control board, embedded in the fan module plastic housing.
The smart fan control board receives fan control input from the system fan controller on the system
backplane and returns fan status information to the system fan controller. The smart fan control
board also controls the power and the pulse width modulated control signal to the fan and monitors
the speed indicator back from the fan. The fan status LED is driven by the smart fan control board.
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 through
upward facing vents near the rear of the supply. The air is then ducted out of the rear of the chassis
with minimal leakage into the cell airflow plenum.
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 allow adequate exhaust ventilation.
Standby Cooling
Several components within the chassis consume significant amounts of power while the system is
in standby mode. The system fans 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 15 (page 29) provides calculations for configurations for the HP Integrity rx7640. For
calculations for the HP 9000 rp7440 server, see Chapter 7 (page 159).
Table 15 Typical Server Configurations for the HP Integrity rx7640 Server
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
72652128224216322
6685195822208162
655819212220882
430812622110881
Environmental Specifications 29