Hello guys!!

I repeat my question again and I hope that somebody help me and answer my quetion. How to find or identify the equipment,and machines,which cosume alot of energy, and if we find them how to treat such problem, to save energy and money?
Anyone has similar expeirnce ?

best regards

You have a wide open question.

Some topics discussed here:
http://www1.eere.energy.gov/industry/bestpractices/tip_sheets_motors.html

Eliminate voltage unbalance - which has a negative impact on efficiency.

Replace V-belt with cogged or sync belt (although maintenance may be more difficult with those alternatives?)

Estimating Motor Efficiency in the field. There are a very large number of ways to do that with varying levels of accuracy. Some listed on page 2 of the link. Rockwell has a motor efficiency wizard device that claims to estimate the efficiency from electrical input measurements.

Improving alignment. This may have some minimal impact on efficiency, although my belief is that the biggest drivers for keeping good alignment are related to equipment reliability.

Purchase of new/replacements motors - this is the time when we have the most opportunity to do something about efficiency.

A few other items not mentioned:
- Motor efficiency can be affected during rewind, especially if burnout oven temperature is not well controlled. Should specify core loss and hotspot tests before/after burnout. Of course this may be standard for many motor shops anyway, but just something to keep your eye on.
- Some of the synthetic lubricant suppliers claim they can save quite a bit of energy in gearbox applications.

Was there a specific area of interest among the above topics or is there a more specific aspect you want to discuss?

Hot motors, provided cooling is okay, consume a lot of energy however at higher efficiency then cold motors. So focus on why a motor is cold!
Arie Mol, NL

Hello All again!

First fo all I want to thank you electricpete for your contribution and valuable information.
I want also thank arie mol for his help. It was really a good help for med. I have another question. Did you have any information about compresses and if they also consumes alot of energy and how to treat such problem?

best regards

Compressing air requires energy. Unnecessary usage of compressed air (for example air leaks) wastes air and therefore wastes energy.

You may be able to find air leaks using ultrasonics.

There is quite a lot more info available on this particular subject (efficiency of compressed air systems) here:
http://www1.eere.energy.gov/industry/bestpractices/tech..._compressed_air.html

I am very grateful for your contribution electricpete. It was really intreseting information. Thanks alot.

best regards

quote:

Originally posted by arie mol:
Hot motors, provided cooling is okay, consume a lot of energy however at higher efficiency then cold motors. So focus on why a motor is cold!

There may be two ways to look at the efficiency. One is certainly the way of looking at the efficiency of the motor. Motor that has the nameplate efficiency of 92% is more efficient than a motor with efficiency 90%.
The other look may be from the point of view of the losses:
If you let a 20 hp motor do the work that a 10 hp motor can handle, the efficiency of the 20 hp will indeed be lower than the efficiency of the 10 hp motor. But the losses will be likely lower. Hence you will pay less for the energy used. And the 20 hp motor will be running cold.
There is no question that the initial choice of the 20 hp motor was a poor one (the 10hp would be cheaper to purchase). But once it is already there, you will not save money by replacing it with 10 hp.
jank

Hello guys !

Well my dear jank, I agree with you, but we have to make a comprehansive analysis if there are any causes which can impact the efficiency of the motor and try to reduce or to eliminate them, such as wrong dimensions, bad chosing of the derive belt, missalingment etc. all of these things can actually impact the motor´s efficiency.
Thanks alot for both of you electricpete and jank for your contribution.
best regards