Backward curved FAN
Backward curved FAN
(OP)
Hello,
First of all, thank you so much for reading this e-mail, and I hope you can help me.
I have one doubt, about centrifugal fans. A colleague has told me that if you rotate a backward curved fan in the opposite direction as the one it has been designed for, no so much change in the fan performance is obtained. For me this is something unbelievable.
So, the question is... does anyone now what happens when rotating a backward curved fan in the opposite direction as the one it has been designed? does the same effect take place in the case a forward curved fan?
Thank you so much!
Best regards,
jon
First of all, thank you so much for reading this e-mail, and I hope you can help me.
I have one doubt, about centrifugal fans. A colleague has told me that if you rotate a backward curved fan in the opposite direction as the one it has been designed for, no so much change in the fan performance is obtained. For me this is something unbelievable.
So, the question is... does anyone now what happens when rotating a backward curved fan in the opposite direction as the one it has been designed? does the same effect take place in the case a forward curved fan?
Thank you so much!
Best regards,
jon





RE: Backward curved FAN
RE: Backward curved FAN
I2I
RE: Backward curved FAN
The reason I am asking this is that one time, because of a wrong connection on the motor of the fan, we started running it in the wrong direction. We realized it was wrong so we changed it, but without measuring anything. So we don't really know what would have happened, and we had this question in mind.
btrueblood, what do you mean with "unpredictable flow at higher flows than the former", I have never heard this nomenclature.
insult2injury, this is what I think also. For me, changing the sense of rotation, the obtained air-flow would be much lower, limiting as you say the operating window.
RE: Backward curved FAN
RE: Backward curved FAN
In your case, since you didn't trip the motor, other parts of the system limited the throughput so that the motor didn't overload. If you had suddenly opened the output up however, who knows...
rmw
RE: Backward curved FAN
Enjoy it.
RE: Backward curved FAN
This post is becoming quite funny, haha.
I agree that this is what would happen. Maybe if I have time, I will make this test in order to obtain real values.
Also, for me "fans" are all model of fans. I know that some literature calls them blower, but all of them are fans.
This is not in order to create a small fight between us with those terms.
Thank you all!
RE: Backward curved FAN
Rmw either knows I'm yanking his chain, or he is cowering.
RE: Backward curved FAN
I am cowering, but it has nothing to do with the fun going on in this thread. I am typing this reply on a laptop powered with a generator in my driveway via a laptop connect card that has finally gotten a data signal during the daytime.
All of the above is a result of Hurricane Ike. I live in the Houston area and have been without power since last Friday evening and the current projections are next Monday for power restoration both in my residence and at our office, so due to all this, I wasn't able to "fan" the flames.
My only comment is that Chicago Blower Company built some mighty fine fans.
rmw
RE: Backward curved FAN