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WaterGEMS - Variable Speed Drive

Dear Bentley

 

I am trying to Model a VSP pump and I am using WaterGems V8i (Select Series 3)

I want to model a a situation where I got a pump which is greater than the required capacity . So I am planning on using a variable speed system to reduce the flow.

In waterGEMs there are two options for VSP , where option 1 I have to select if it is a VSP and option 2 there is the VSP battery, which one of the options I am supposed to use?.

This is a simple system where a pump is used to pump water from a lower elevation to a high elevation. In both of the above options there is an option to select if it is fixed head or fixed flow and a control node. For my problem is am to use fixed head and select a control node that is closer to the pump?.

What is the relation of the relative speed factor to the above issues.

 

suminda  

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  • Hello suminda79,

    usually you have to use VSP (your option 1).

    when you model using VSP, you have to decide the control type based on the real system, for example if you have restricted the discharge pressure at the header you have to use fix head and that head should be equal to settings point.

    Make sure to use the existing pump curve to reflect the real system, when the relative speed factor (maximum)= 1 that means the pump speed is 100%, but you can set number more than 1 if you expect your pump is not adequate pump, and in the result section you can see what is the relative speed factor calculated.

    I hope that help.

    Note1: below is example screenshot.

    Note2: for future posts; do not start with Dear Bentley, just wright your post directly,

    Regards,

    Mohamad Azzam

Reply
  • Hello suminda79,

    usually you have to use VSP (your option 1).

    when you model using VSP, you have to decide the control type based on the real system, for example if you have restricted the discharge pressure at the header you have to use fix head and that head should be equal to settings point.

    Make sure to use the existing pump curve to reflect the real system, when the relative speed factor (maximum)= 1 that means the pump speed is 100%, but you can set number more than 1 if you expect your pump is not adequate pump, and in the result section you can see what is the relative speed factor calculated.

    I hope that help.

    Note1: below is example screenshot.

    Note2: for future posts; do not start with Dear Bentley, just wright your post directly,

    Regards,

    Mohamad Azzam

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