Calculating Torque for Fan Speed

  • Thread starter Thread starter violin_writer
  • Start date Start date
  • Tags Tags
    Fan Torque
AI Thread Summary
To calculate the torque required to spin a fan blade, the weight of the fan is less significant than its design and size. A fan curve from the manufacturer provides essential data on the power needed at various speeds. The fan's speed does not directly affect torque; instead, operating conditions like pressure and airflow are crucial. Understanding the three Fan Laws or Affinity Laws can further aid in the calculations. Accurate torque calculations are vital for efficient fan operation.
violin_writer
Messages
18
Reaction score
0
Hello, I need figure out the torque is required to spin a fan blade at a certain speed. I know it doesn't particularly matter how big the fan is, but how heavy it is. I know a 1gm fan is much easier to turn than a 2gm fan.

Can anyone help me?
 
Engineering news on Phys.org
At a constant speed, it's not the weight that matters, it's the size of the fan (well, its design).

Get a fan curve from the manufacturer, this shows you the power required to drive the fan at a range of speeds.
 
...and the speed of the fan doesn't actually have a direct impact, it's the operating conditions: the pressure and airflow.
 
There are three Fan Laws or Affinity Laws that may help you get started:
http://www.nrmurphy.com/fans_laws.html
 

Thread 'Query on Isentropic relationships (such as PV^gamma = constant)'

Hi all, I have a question. So from the derivation of the Isentropic process relationship PV^gamma = constant, there is a step dW = PdV, which can only be said for quasi-equilibrium (or reversible) processes. As such I believe PV^gamma = constant (and the family of equations) should not be applicable to just adiabatic processes? Ie, it should be applicable only for adiabatic + reversible = isentropic processes? However, I've seen couple of online notes/books, and...
View full post »

Thread 'Dry sump pump issue'

I have an engine that uses a dry sump oiling system. The oil collection pan has three AN fittings to use for scavenging. Two of the fittings are approximately on the same level, the third is about 1/2 to 3/4 inch higher than the other two. The system ran for years with no problem using a three stage pump (one pressure and two scavenge stages). The two scavenge stages were connected at times to any two of the three AN fittings on the tank. Recently I tried an upgrade to a four stage pump...
View full post »

Similar threads

Comparetto type Air Cleaner/Filter: What causes its increased airflow?
Replies
5
Views
3K
Do Dual Fans Increase Radiator Efficiency More Than a Single Larger Fan?
Replies
6
Views
4K
How to calculate heat transfer?
Replies
11
Views
3K
B Determining Electron's Momentum and Position Simultaneously
Replies
4
Views
1K
Calculating the speed air comes out of a fan
Replies
1
Views
2K
Reaction Torque from an Ice Auger
Replies
18
Views
2K
Calculating the Torque that a fan would exert on a Hex shaft
Replies
6
Views
4K
Mechanical noise - A/C and radon fan standing wave hum
Replies
4
Views
4K
Calculating the effectiveness of a Radiator and Fan Combination
Replies
2
Views
8K
Calculating Power for Hovering Thrust of a Fan
Replies
6
Views
5K

Hot Threads

Recent Insights

Back
Top