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- Alternating Current (AC) - An electric current which reverses direction regularly. Most US household current is AC with a frequency of 60 cycles per second. Since computing equipment requires DC current, power supplies transform AC to DC.
- Air conditioning airflow efficiency (ACAE) - A measure of the amount of heat removed per standard cubic foot of airflow per minute.
- Air handling unit (AHU) - Device consisting of a blower, heating and cooling elements, filter racks or chamber, dampers, humidifier, and other central equipment in direct contact with the airflow. This does not include the ductwork through the building.
- Air Mixing - The mixing of cold and hot air. This can be an issue in data centers because it reduces the efficiency of the cooling systems and reduces their ability to cool components.
- Airside Economizer - Directs outside air in the use of cooling, directly or indirectly, into the data center when the air temperature is at or below the cooling set point.
- Aisle - The open space between rows of racks in a data center. Best-practice dictates racks should be arranged best with consistent orientation of front and back of equipment creating ‘cold 'and ‘hot 'aisles, allowing you to minimize cooling where it is not needed. Only the front intake air of you servers and devices should be cooled.
- Asset Management System (AMS) - An information system which tracks assets such as servers, network equipment, etc.
- American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) - An international technical society organized to advance the arts and sciences of air management. (see http://www.ashrae.org/)
- Automatic Transfer Switch (ATS) - Automatic transfer switches continually monitor the incoming utility power. Any anomalies such as voltage sags, brownouts, spikes, or surges will cause the internal circuitry to command a generator to start and will then transfer to the generator when additional switch circuitry determines the generator has the proper voltage and frequency. When utility power returns or no anomalies have occurred for a set time, the transfer switch will then transfer back to utility power and command the generator to turn off, after another specified amount of "cool down" time with no load on the generator.
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If there are terms or acronyms you believe should be in this
glossary (e.g., PDU, CRAC, Rectified AC, etc.) feel free to
send us an email.
