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Power Consumption Of Centrifugal Pumps


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#1 Venkat @89

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Posted 27 July 2015 - 01:47 AM

Hi all,

I would like to know why does power consumption of the pump increase as volumetric flow rate from the pump increases, even though impeller remains constant?

From the mathematical point of view I do understand. But I couldn't feel when the speed of the impeller is same then why does power consumption increased?

It might be true as volumetric flow rate increase energy loss will also increase, but how could machine can feel it and raise the power consumption? Please clarify my doubt. Thank you.

#2 Raj Mehta

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Posted 27 July 2015 - 02:54 AM

Well, I believe, as Q (vol. flow rate) increases, your velocity of the suction liquid also increases, since the pipe diameter is constant. So as the suction velocity increases, the impeller speed should also increase to match the incoming flow, thus increasing the power consumption. If not, then there would be accumulation and/or back flow.  

This is just my understanding of the scenario. 



#3 Zauberberg

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Posted 27 July 2015 - 06:21 AM

It is easy to understand this concept if you lift:

 

1) 5kg weight

2) Then you drop 5kg and lift 10kg weight, with the same speed.

 

Do you need the same power for both cases?



#4 fallah

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Posted 27 July 2015 - 07:19 AM

Chalapathi,

 

The pump power has direct relation to head and flow rate; but you can refer to affinity laws to understand why the power will increase higher with flow rate rather than head...






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