[KoniEneo]

Hey my Instructor and I were trying to understand the wording of a review question from Chapter 19 Compressors:
The answer is A in the answer sheet, but B is worded so oddly that it doesn't make much sense.

Which of the statements regarding centrifugal compressors is NOT true?
A. As the speed of a centrifugal compressor increases, its efficiency decreases.
B. Vapor is drawn from around the outside of the stator and compressed inward towards its centrally located discharge.
C...
D...

If someone could break it down so B is more understandable or say if is actually false, that would be greatly appreciated. The diagrams and text didn't really explain this directly/don't show it well.

 

[MaxBurn]

I'll take a stab at it; the driven wheel of the compressor sucks from the middle and flings to the outside where the discharge is. So that part is backwards. I think stator is just thrown in to confuse. How did I do?

 

[BBeerme]

Ding, ding, ding . . .

https://www.youtube.com/shorts/znaZfVUCgT4

 

[pecmsg]

B) False

Please post C & D answers.

Most multiple choose questions have 2 bad answers and 1 questionable answer.

Centrifugal….. to Throw!
A squirrel cage fan is a centrifugal fan!

 

[pecmsg]

Hey my Instructor and I were trying to understand the wording of a review question from Chapter 19 Compressors:
The answer is A in the answer sheet, but B is worded so oddly that it doesn't make much sense.

Which of the statements regarding centrifugal compressors is NOT true?
A. As the speed of a centrifugal compressor increases, its efficiency decreases.
B. Vapor is drawn from around the outside of the stator and compressed inward towards its centrally located discharge.
C...
D...

If someone could break it down so B is more understandable or say if is actually false, that would be greatly appreciated. The diagrams and text didn't really explain this directly/don't show it well.

If you’re a student apply for Pro Status.
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[ehsx]

A & b are false. A has a number of limiting factors and can go either way.

CapAcity is based on mass flow. Tip speed and lift are limiting factors.

Efficiency is based on kw per ton.