Intel EPS1U - Manual (Page 9)

SSI
EPS1U Power Supply Design Guide, V1.1
4.3 Airflow Requirements
STATUS
Recommended
The power supply shall have a two-speed fan(s) and provide cooling to both the supply and the system. During
low-speed fan operation, the power supply shall not exceed a noise level of 38 dBA measured at one meter on all
faces. At low fan speed, the power supply shall provide a minimum of 6 CFM of airflow with 0.003 inH2O of
system backpressure. At high fan speed, the power supply shall provide a minimum of 10 CFM with 0.006 inH2O
of system backpressure.
4.4 Temperature Requirements
STATUS
Recommended
The power supply shall operate within all specified limits over the T
op
temperature range. The average air
temperature difference (
∆
T
ps
) from the inlet to the outlet of the power supply shall not exceed the values shown in
Table 2. All airflow shall pass through the power supply and not over the exterior surfaces of the power supply.
Table 2: Thermal Requirements
Item Description MIN MAX Units
T
op
Operating temperature range. 0 45 ° C
Temperature rise from inlet air to outlet air of power supply.
125 W output power, 10 CFM, Sea level, 25
° C inlet air.
125 W output power, 6 CFM, Sea level, 25 ° C inlet air.
15
25 ° C
° C
Temperature rise from inlet air to outlet air of power supply.
250 W output power, 10 CFM, Sea level, 25
°
C inlet air.
250 W output power, 6 CFM, Sea level, 25
°
C inlet air.
20
30 °
C
°
C
∆
T
ps
350 W output power, 10 CFM, Sea level, 25 ° C inlet air.
350 W output power, 6 CFM, Sea level, 25
°
C inlet air.
30
40 ° C
°
C
T
non-op
Non-operating temperature range. -40 70 °
C
The power supply must meet UL enclosure requirements for temperature rise limits. All sides of the power
supply, with exception to the air exhaust side, must be classified as “Handle, knobs, grips, etc. held for short
periods of time only”.