Intel EPS1U Benutzerhandbuch

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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. 
45 
°
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 
 
°
°
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 
 
°
°
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 
°
°
T
non-op
 
Non-operating temperature range. 
-40 
70 
°
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”.