Questions tagged [fan]
15 questions
3
votes
1 answer
Fan performance curve
I am being asked to compare a fan which is going obsolete with its proposed replacement. From a mechanical and electrical point of view, they are almost completely identical so I have no concerns from that point of view. However, when I look at…
am304
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vote
1 answer
Why does the manual to my floor fan tell me to pull out the cord whenever it's not in use?
In the manual to my just-bought floor fan, it says this (among many other weird requirements/expectations):
Pull out the plug from the power point when the product is not in use. Do not pull the power cord to pull out the plug.
Why do they tell me…
Yoshito Y
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1
vote
1 answer
What size of fan requires motors with a transmission?
I am wondering at what fan size/speed a direct drive motor is no longer sufficient to drive a fan? Phrased alternatively, what size/speed of fan requires motors with a transmission? For an axial fan.
Jordan McBain
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0
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0 answers
Radial fan with both input and output on the same plane
An axial fan moves air from one side to the other, where the fan is placed on the plane normal to the axis:
A radial fan, moves air from a normal axis to the same plane where the fan runs:
Is there a fan that moves air in the same plane as it…
Mark
- 101
- 4
0
votes
2 answers
Multiple inline fans
I have a chimney with a single 100 cfm exhaust fan. If I would add a second similar fan in the same chimney,in line with the first fan, what would happen? Would I move 200 cfm? Would I still move 100 cfm? Or would my cfm just increase slightly, and…
Geo
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2 answers
How to theoretically determine the flow rate for a fan design?
I am trying to design a ducted axial fan. The fan will be pulling air through a filter, and ejecting out into the atmosphere (For a CO2 direct air capture application). However I want to start with the physical parameters (blade diameter/hub…
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How can I improve this radial impeller (radial cooling fins) design?
I recently rewound a 1/4 hp single-phase induction motor used in a top-load washing machine (picture), but there's an issue: It heats like hell, from its own original design, and I rewound it exactly like the original winding.
I tested a similar…
user2934303
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0
votes
1 answer
Scroll design for off the shelf tangential/cross flow fan rotor
I'm trying to figure out a somewhat optimized fan scroll shape for a cross flow fan rotor I aquired. However I seem to have vastly underestimated the complexity as I have a lot of trouble finding useful literature or other resources. The rotor in…
tstdr
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0
votes
1 answer
What is the purpose of springs in rotor's ventilator/fan
In my lawmower's motor plastic fan/ventilator on rotor has broken to few pieces
There are 2 small springs in fan's slots.
What is the purpose of these springs?
Are there any standards for such components?
Edit:
This is how it looks like in working…
voldi
- 101
- 1
0
votes
2 answers
Increasing airflow of fan
I learned at at young age from a physics kit that one can blow up a large bag with your mouth by blowing into it from a distance and letting the air pick more air with it. Later in life when Dyson launched its fan, I understood the principle well.…
J. Doe
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- 1
0
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0 answers
is there a difference in performance between these two fan designs
These two fans are usually used in hairdryer is there a difference between them in performance if both have same rpm and same outer diameter.
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1 answer
Routing the flow from an axial "box" fan
I have a project where I need to generate a certain flow rate to levitate a ping pong ball using the Bernoulli principle. From some rough calculations, I found that it would take about 30 CFM through a 2" diameter hole to lift the ball.
The only…
nwsteg
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0
votes
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How does temperature not affect fan airflow?
Please correct me if I am wrong : fans are devices moving a constant volume of air, given a constant rotation speed.
Though, flowrate depends of the total resistance of a circuit and the ability of the fan to overcome it. This resistance depends of…
Snite
- 23
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0
votes
1 answer
How can a fan keep spinning normally but suddenly move very little air?
I have a small portable fan, around 15 cm in diameter and lately it is behaving oddly.
Basically I turn it on, the airflow is good but then after 10 minutes or 30 minutes or sometimes hours, the airflow almost stops.
The fan keeps spinning and it…
user81993
- 153
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0
votes
1 answer
How to select a fan blade for my application (strong, focused breeze)
My question is how fan blade design relates to the focus of the air leaving the fan. I am looking to generate the most focused breeze I can with a fan blade, excluding additional ducting etc, the fan is in an open-air environment.
I see a mix of…
Cameron Roberts
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