pump efficiency.zip
Hello
For the attached Model, we simulated the pump shutdown hammer, and there is an error message: "Pump Efficiency must be between 0% and 100% inclusive.". I have reviewed the model but cannot find what's wrong on it. Could you help to review this model, how could we modify the model to let it can be calculated.
Thanks a lot
Hello Jinlong,
Here is an article which will help you resolve this issue;
User notification: "Pump Efficiency must be between X% and Y% inclusive."
However, when I ran the initial conditions the flow demanded was "0" and the flow supplied was "0". The pumps are delivering a flow of "0" at a head of 30.67 m. The efficiency at "0" flow is around 81%. However, this point is not close to the BEP defined i.e. flow of 9010 L/s and efficiency of 86%.
Because the four-quadrant characteristic curves (based on the selection of Specific Speed) used during the transient simulation are developed for pumps at their ‘rated’ values, it is important for the pump to be operating near its best efficiency point for the initial conditions.
Hope this helps.
Regards,
Yashodhan Joshi
Hello, Yashodhan
Thanks for your answer, and it seems that it is caused by the initial conditions of " the flow demanded was "0" and the flow supplied was "0" ". So could you help to review this model again and what's the parameters caused the problem? Such as, which parameter can be modified to remove this error notification.
See answer to this in this separate thread: zero initial flow
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.