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Online calculator for unavailability caused by fan failures.
The background is described in the article Fan Failures and
Unavailability.
Related links
Thermal design for electronics
Thermal online tools
Unit conversion
Comments
Description
The major input is represented by the image with
the 3 thermometers:
- The first is the ambient temperature for which
the equipment has been
designed.
- The second is the ambient
temperature for which the equipment is fully functional in
case
of 1 fan failure.
- The third is the ambient
temperature for which the equipment is fully functional in
case
of 2 fan failures.
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There are three diagrams. Clicking on them opens an editing
area. The text can be copied and pasted.
- The top diagram shows the ambient temperature duration
- The middle diagram shows fan MTBF as function of temperature
- The bottom diagram shows fan speed as function of sensor temperature
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Air temp inc is the temperature increase of the air vented
through the system.
Failure intensity at half speed is a compensation term that
takes into count that aging, (probably), is slower at low fan
velocities.
Repair time is the time it takes to replace a failing fan.
The results are shown in bold text. The value in
parenthesis is the result of the former calculation, (if the
new result has changed).
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