HP Server rp7420 HP 9000 rp7420 Server - User Service Guide, Fifth Edition - Page 112

Bulk Power Supply Cooling, PCI/Mass Storage Cooling, Standby Cooling

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Each cell area fan cooling 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 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 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 Cell Boards Qty 2 2 2 1 Memory Per PCI Cards DVDs Cell Board (assumes 10 watts each) GBytes Qty Qty 16 16 2 8 8 0 4 8 0 4 8 0 Hard Disk Core I/O Bulk Power Typical Drives Supplies Power Qty Qty Qty 4 2 2 2 2 2 2 2 2 1 1 2 Watts 2030 1733 1678 1047 Typical Cooling BTU/hr 6930.42 5916.46 5728.69 3574.46 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 112 System Specifications

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Each cell area fan cooling 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 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
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/O
Hard Disk
Drives
DVDs
PCI Cards
(assumes 10
watts each)
Memory Per
Cell Board
Cell
Boards
BTU/hr
Watts
Qty
Qty
Qty
Qty
Qty
GBytes
Qty
6930.42
2030
2
2
4
2
16
16
2
5916.46
1733
2
2
2
0
8
8
2
5728.69
1678
2
2
2
0
8
4
2
3574.46
1047
2
1
1
0
8
4
1
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
112
System Specifications