SMART Embedded Computing 6806800V18A, Installation And Use Manual

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Shelf Management Module
AXP1440-C07 Installation and Use (6806800V18A) 147
The
deltaT
set point is calculated as follows:
For ambient air temperatures at or below 25°C (default T1), the deltaT set point is set to
20°C (default S1). For ambient air temperatures at or above 55°C (default T2), the deltaT
set point is set to 10°C (default S2). For ambient air temperatures between T1 and T2, the
deltaT set point is calculated using the following algorithm:
Using the above algorithm, at 40°C ambient, the cooling algorithm adjusts the fan speeds
to maintain a deltaT rise in temperature at 15°C.
The values for S1, S2, T1, and T2 are configurable.
S1
S2
T1
T2 Inlet Air Tempe
S2 - S1
T2 - T1
S1 +
(T
inlet
- T1)
Table 7-7 Cooling Budget
Ambient Temperature Temperature Rise
25

C Delta T = 20

C
40

C Delta T = 15

C
55

C Delta T = 10

C