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aravindharaj
aravindharaj • Mar 13, 2012

conserve energy on UPS

As i have said already i'm doing energy audit in a commercial building. Is any techniques are there to conserve energy on UPS and in Air conditioners ???
Unfortunately UPS by its definition is meant to keep an uninterrupted supply. Usually non essentials peripheral loads also get plugged in. Also the load on the UPS tends to be well below the maximum permitted for the unit.
Consider putting only essential loads on the UPS and ensure that enough such load to a good % of the maximum load is on each UPS for minimal power wastage.

On ACs, minimise heat input into area by proper curtaining, sun control measures and heat generating equipment inside. Also the tendency is to keep the temperature far below what is really needed for comfort simply because the AC is there. Put up the thermostat to the highest possible value.
aravindharaj
aravindharaj • Mar 13, 2012
Oh thank you so much sir . . I think it will be helpful for me. . 😀
aarthivg
aarthivg • Mar 14, 2012
bioramani
Consider putting only essential loads on the UPS and ensure that enough such load to a good % of the maximum load is on each UPS for minimal power wastage.
I cant able to understand these lines. Can you explain me in detail sir.
If an UPS has a designed 2KW load, it is best to load it up to say 1.8KW. This 1.8 KW should be preferably CPU/ memory devices so that back up function is available to avoid data loss/corruption. Peripherals like printers and scanners guzzle power and need not be on an uninterrupted supply.
The reason why I suggested this is because in an UPS charge/discharge cycles have an overall efficiency of about 60% only. It goes still lower when the load is less than full.
aarthivg
aarthivg • Mar 14, 2012
bioramani
The reason why I suggested this is because in an UPS charge/discharge cycles have an overall efficiency of about 60% only. It goes still lower when the load is less than full.
Sir,
Why the efficiency of UPS is 60% only?
aarthivg
Sir,
Why the efficiency of UPS is 60% only?
Two reasons.
First, mains power has to be brought down from 220 AC to a DC voltage slightly above battery voltage. The conversion electronics consumes some power that is permanently lost.
Secondly Charging the battery consumes some power in the circuit resistance and internal resistance of the battery. The same thing happens in reverse when the battery is discharging. An additional problem is that the battery will not give all the power on discharge cycle.
If all these losses are taken into account overall one gets about 60%.
aarthivg
https://www.relres.com/news/118/ups-efficiency-ratings-a-study-in-energy-savings
That is a good article but the ground reality of Indian Batteries and systems are different. Of course CE is international. However, bulk of the users are Indian.

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