Questions tagged [fan]
29 questions
9
votes
4 answers
Why are all computer fan blades thin?
100% of all PC cooling fans from 90s to today, from 40mm to 200mm, from budget to most expensive high performance models, they all use thin blades.
Why?
Airplanes wings and propellers use more complex thick "airfoil" shapes. Wouldnt a thick airfoil…
wav scientist
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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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1
vote
0 answers
Aerodynamic design and characteristic of fan vs blower
I just learnt about the difference between a fan and a blower, namely the former providing high flow rate at very low outlet pressure (<1.1*inlet) and the latter providing a slightly increased pressure with less flow rate. I was a bit surprised that…
temporary_pigeon
- 11
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1
vote
2 answers
Help me choose an approach to gpu cooler design
I want to remake my gpu's cooler cause the original fans have a terrible bearing sound on low rpm and no amount of software solution helped.
Anyway, I want to use 3x nf-a9x14 pwm 92mm fans as its fits the heat sink the best. But, as I have…
Nah
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- 2
1
vote
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
- 111
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1
vote
2 answers
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
votes
1 answer
How wasteful is a cooling fan enclosure?
Looking at the fan in the attached photo, its cage takes a lot of surface on both sides.
Does this cause a significant reduction of blowing efficiency or can it be ignored in the sense that
it won't make much difference if the grilles are to be…
Cassian
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0
votes
0 answers
Does anyone know what happened to my radial blower fan? (Micronel U65HN)
I have a Micornel U65HN product, and I am experiencing issues with the blower. The fan is not spinning freely when I try to turn it by hand. I have already performed an electrical check, and everything appears to be working normally on the…
Koniki
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0
votes
1 answer
32" fan blowing through 24" tube
I currently have a 24" chimney fan rated at about 10000 CFM blowing through a 24" tube. If I were to make a cone so that I could install a 32" fan to blow through the same 24" tube, would that work? The 32" fan would be rated around 15000 CFM.
Geo
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0
votes
1 answer
Strange air vents in my office. Is it safe?
On my office ceiling there are a few air vents. They are usually inactive, yet a few days per year (for some incomprehensible reason) they start working, and air flows in.
What concerns me is the strange material that lies just on top of the vent's…
user1317811
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0
votes
2 answers
are ducted fans better than turbines generating vaccum?
Basically I want to make a trap that sucks mosquitoes into a screen container for future studies, to do this I need to generate a vacuum and I need to choose whether to use a ducted fan (simpler) or some type of turbine. Is there any type that would…
RHR
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- 1
0
votes
1 answer
Why is the fan efficiency zero at high flow rate?
How is the fan efficiency zero at the highest flowrate point (at which there is zero pressure rise)? I know the fan efficiency is given as
$fan\_efficiency = output\_power/input\_power$
where output_power of the fan is given
$Output\_Power =…
GRANZER
- 337
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0
votes
0 answers
How can I estimate the shape of stator vanes to straighten the flow of an axial fan?
I have an axial 140 mm fan which I need to connect to a duct and I need to design a converging duct as adaptor from circular to the shape and size of the duct I have.
From past experiences, an axial fan followed by a duct will result in too low…
FarO
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0
votes
0 answers
What are rule of thumb or technical standard for industrial fan?
I want to design a small centrifugal fan to transport wood dust. Is there any Handbook or ISO/DIN/ASME standard for industrial fan? For example, number of blade, hub size, shaft diameter, blade thickness, shroud thickness, etc.
Maaruf Bussri
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