Optimization of the refrigeration plants operation

[US Iceman]

Saving energy isn't always a good thing.

If I turn this around just a bit, I would add: Trying to save energy which results in unintended consequences is just plain dumb. This is like you example or that of benji. Turning off compressors to save energy is not good either.

Energy reduction (& associated costs for it) has to be accomplished in a manner which allows the refrigeration system to meet its intended duty with no negative impact.

One of the major issues is what I call the cookie-cutter syndrome. Everyone wants to use the same approach on any application. These prescriptive approaches are not always helpful and do not produce the anticipated results. Then energy conservation gets a bad name.

I had a conversation with someone who basically implied if you were not a Certified Energy Manager, you did not understand the problems and were of no use to them.

BS (large male cow excrement) was almost my reply...

[Segei]

If I turn this around just a bit, I would add: Trying to save energy which results in unintended consequences is just plain dumb. This is like you example or that of benji. Turning off compressors to save energy is not good either.

Energy reduction (& associated costs for it) has to be accomplished in a manner which allows the refrigeration system to meet its intended duty with no negative impact.

One of the major issues is what I call the cookie-cutter syndrome. Everyone wants to use the same approach on any application. These prescriptive approaches are not always helpful and do not produce the anticipated results. Then energy conservation gets a bad name.

I had a conversation with someone who basically implied if you were not a Certified Energy Manager, you did not understand the problems and were of no use to them.

BS (large male cow excrement) was almost my reply...

I agree that every refrigeration plant should has custom approach. Every plant is unique(in industrial refrigeration) and energy savings approach should be unique as well. Many people believe that hot gas defrosting can't be done at condensing pressure lower than 110psig. This is wrong. Typically I do defrosting at 100psig or lower. You should know how to balance hot gas supply, hot gas condensation and condensate draining. It isn't simple as it may looks. However, it is rewarding. 1psig of lower head pressure can save a few thousand dollars per year. Ask questions and do testing for your plant.
I'm laughing about about a Certified Energy Manager. This person has no clue how energy saved in industrial refrigeration. These are two sides of energy savings. Electrical and refrigeration. Electricalower factor, VFDs, high efficiency motors and etc. Refrigeration: optimum head pressure, optimum suction pressure, optimum defrosting and etc. Electrical can give just 20-30% of total energy savings, but they require huge capital investments. Refrigeration can dive us 70-80% without huge capital investments. Many people have no idea about refrigeration energy savings.

[US Iceman]

I'm laughing about about a Certified Energy Manager. This person has no clue how energy saved in industrial refrigeration.

I know that and you know that, but it is a top secret apparently because no one else knows it!

Many people have no idea about refrigeration energy savings.

Ohhh, but they know about float the discharge pressure.

[subb-zero]

The thing i found from experience, the weather changes everyday so does you running temps they change with ambient and humidity, so do the same with refrigeration components CONTROLS, VFD'S and so on its only logic dont you guys think so?

[Segei]

The thing i found from experience, the weather changes everyday so does you running temps they change with ambient and humidity, so do the same with refrigeration components CONTROLS, VFD'S and so on its only logic dont you guys think so?

When the weather change operating of evaporative condensers will change.Optimum set point should be readjusted. For example. Optimum wet bulb approach is 10degF. During the day wet bulb temp. is 75 degF so optimum head pressure will be 75+10=85degF or 150psig. During the night wet bulb drop to 60F and optimum head pressure will be 60+10=70F or 115psig. Capacity of evaporative condensers should be readjusted.