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Duc_Hoang

Calculation of Pressure rise

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Hello expert,

  • I have a question about the expression to use when i want to calculate the PRESSURE-RISE in a system which has a pump/fan inside.

As i have gone through tutorial Acu-T 5000: Blower - Steady, it shown that how to calculate pressure rise by:
 PRESSURE_RISE = PRESSURE_outlet - PRESSURE_inlet. (this is STATIC PRESSURE value)


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  • But follow my understanding with Bernoulli's law, the expression should be:

   PRESSURE_RISE = Total_Pressure_outlet - Total_Pressure_inlet

 

Can anyone help me clear this thing? Also correct if i am wrong.
Appreciate any help.
Thanks in advance.

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The equation given in the tutorial compares static pressure.  If you want to compare total pressure, then your expression would be correct.  It depends on what you want to compare - static or total.

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10 hours ago, acupro said:

The equation given in the tutorial compares static pressure.  If you want to compare total pressure, then your expression would be correct.  It depends on what you want to compare - static or total.

hi acupro,

thanks for your answer.

do you know normally what kind of pressure rise is used when evaluating a pump? static or total?

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My guess would be that static pressure would be typical, as that is simpler to measure, and doesn't obstruct the flow.  Simply drill a hole in the side of the inlet and outlet pipes and put a tube there - flush to the inner/wetted surface.  A total pressure measurement requires a pitot probe - where you install a device that protrudes into the flow and bends such that it points directly into the oncoming flow.  I assume there's no harm in reporting both, but I would guess static pressure rise is typically reported.

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19 hours ago, acupro said:

My guess would be that static pressure would be typical, as that is simpler to measure, and doesn't obstruct the flow.  Simply drill a hole in the side of the inlet and outlet pipes and put a tube there - flush to the inner/wetted surface.  A total pressure measurement requires a pitot probe - where you install a device that protrudes into the flow and bends such that it points directly into the oncoming flow.  I assume there's no harm in reporting both, but I would guess static pressure rise is typically reported.

hi Acupro,

Thank you very much.

Your explanation help me clearly understand about this.

Thanks again.

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