How to reduce energy consumption (motors) 3

[rayhud]

Hi,

I'm a student, and i have been given a task during my internship, which is a study of the energy consumption of all the motors inside the enterprise, in order to try and come up with a plan to reduce their consumption.

I've done some research, and was able to determine that in order to do so, a speed control of motors so as to adapt it to the load is necessary, as well as the optimisation of their efficiency and regular maintenance.

The problem is that i can't figure out a way to start working on this project, so what i need to know is how to be able to give a solution through analyzing the motors' energy consumption ? and what are the points i need to focus on ? or the motors i need to target ? and which strategy is to adopt in order to be able to succeed in this task ?

And if there are more ideas on the solutions to reduce motors' energy consumption, please feel free to enlighten me.

Thank you in advance.

 

[LionelHutz]

I did mention the waste applications in my first response. I should also say that I mixed together two concepts in my first post. The first part of my last paragraph was saying that if you need a certain HP to turn a shaft for a process then you need that HP. You can try to change rpm but either the amount of work changes or the torque required just changes in opposite proportion to the rpm. The example was saying that if you need to do a certain amount of work a day, you need to consume a certain amount of energy to do that work.

 

[electricpete]

Op seems to have disappeared, but it’s a good discussion and brings out a lot of aspects.

I’ll throw one more item onto the pile. When pump flow is heavily throttled, I think it is not just the losses associated with the throttle valve itself that need to be considered, but also the losses internal to the pump. When the pump is operated/throttled at flow far below BEP there are a lot of pump losses due to internal recirculation through tight clearances past the wear rings. I think lowering the speed can reduce internal recirculation and improve the efficiency of the pump itself. Pump efficiencies drop much lower than motor efficiencies, so they probably deserve at least as much attention as motor efficiencies in the discussion.


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(2B)+(2B)' ?