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JM_32182014-Participant
4-Participant
Feb 20, 2024 8:25 AM UTC
Question

HELP WITH POWER FORMULAE MATHCAD 9

Hello

I have the next formulae of power but I think  there is an mistake, Please somebody help me

Pot=(PxQ/360)/1.358

P pressure in bar=225 bar

Q flow in l/min=78 l/min

 

Pot=( (78*225)/360)/1.358=35,8kW

 

Thanks

9 replies

terryhendicott
terryhendicott21-Topaz II
21-Topaz II
Feb 20, 2024 9:53 AM UTC

Hi,

The equation is an empirical one in that it is not unit consistent.

So you need to strip the units from each term of the equation.

Do this by dividing.

Then you need to apply the units of the equation.

Capture.JPG

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Fred_Kohlhepp23-Emerald I
23-Emerald I
Feb 20, 2024 1:35 PM UTC

Terry,

 

The equation is unit consistent:

Fred_Kohlhepp_0-1708436032365.png

We need to look harder at his sheet.

 

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    MartinHanak24-Ruby III
    24-Ruby III
    Feb 21, 2024 8:24 AM UTC

    Hi

    where did you get the following information?

    Pot=(PxQ/360)/1.358

    P pressure in bar=225 bar

    Q flow in l/min=78 l/min

     

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    JM_32182014-ParticipantAuthor
    4-Participant
    Feb 21, 2024 8:44 AM UTC

    Hi

    This Iis in a hydraulic manual.

    It's usually in hydraulic power calculations

     

    JM

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    MartinHanak24-Ruby III
    24-Ruby III
    Feb 21, 2024 10:00 AM UTC
    @JM_3218201 wrote:

    Hi

    This Iis in a hydraulic manual.

    It's usually in hydraulic power calculations

     

    JM

    Hi,

    how do you know that the result of Pot=( (78*225)/360)/1.358 should be 35.8 kW ?

     

    MartinHanak_0-1708509552160.png (Fred_Kohlhepp)

     

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