What is computer room air conditioning?
Computer Room Air Conditioning (CRAC) is a unit used to monitor and maintain the temperature of the room in which the computer equipment is operating. They ensure the correct air distribution and humidity in the network room. CRACs are most commonly used in data centers.
Until recently, standard air conditioning units were typically used to maintain temperatures in rooms where computer equipment is operated. These are now largely replaced by CRACs. These have a lot in common with household air conditioners that are often used in homes. They consist of a direct expansion refrigeration circuit and air is blown over a cold coil for cooling. The temperature of the coil is maintained with the help of a refrigerant.
However, unlike household air conditioners, these units generally only have on and off controls. In addition, some CRAC units can help control airflow in the data center.