The abbreviation for valve-regulated lead-acid battery is VRLA. 

Data center room PUE The smaller the value, the greater the power consumed by the supporting infrastructure of the data center such as cooling and power supply.

In the air conditioning system, the function of the oil and gas separator is to separate the lubricating oil from the compressor exhaust and return the separated lubricating oil to the compressor. 

The access control system can only set the user to open the door, and cannot set when to open the door.