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Thread: evap fan speed while iced up
02-16-2013, 07:34 PM #14
It would have static pressure pushing out on the walls, but that pressure does not work directly against the fan paced within the tank.
The increased density of the air in your hypothetical pressurized tank is what would cause the fan to operate under a higher load than the same fan placed in your hypothetical vacuum tank.
To simplify things for better understanding of the air density thing, imagine that your standard motor type fan is a device made for throwing boxes of air, 1 cubic foot in size.
If the air in the 1 cubic foot boxes is very dense, it will weigh more than if the inside of the boxes were in a vacuum.
Since the fan has to work harder to throw the heavier boxes of very dense air, it will have higher amp draw than it does throwing the lighter boxes that are in a vacuum.
The static pressure the fan is moving air against is a measure of the flow resistance of the fan assembly, and all associated components it has to move air through.If more government is the answer, then it's a really stupid question.
02-16-2013, 08:50 PM #15
Since we're in the Refrigeration and Ice Making forum, we're most likely talking about Prop type fans which will exhibit the exact opposite behavior that you're describing.
Squirrel cage, centrifugal type blowers will do exactly what you described.
02-16-2013, 09:08 PM #16Regular Guest
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02-16-2013, 10:27 PM #17
02-16-2013, 10:48 PM #18
02-16-2013, 11:07 PM #19Professional Member*
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If you consider that all types of fans (radial/centrifugal and axial) are airfoils, and you consider how airfoils create thrust by creating pressure differences, and you also consider that air as a fluid cannot be pulled, only pushed...Then you should be able to derive most of your answers to the original question.
02-17-2013, 12:08 AM #20