What is a CRAC in a data Centre?

A computer room air conditioning (CRAC) unit is a device that monitors and maintains the temperature, air distribution and humidity in a network room or data center. CRAC units are replacing air-conditioning units that were used in the past to cool data centers.

What is the difference between CRAC and CRAH units?

Unlike a computer room air conditioning (CRAC) unit that uses mechanical refrigeration to cool the air in a data center, a CRAH uses fans, cooling coils and a water chiller system to remove heat. A typical rack of servers can generate temperatures up to 100 degrees Fahrenheit.

What are the main components of a CRAC unit?

What are the main components of a CRAC Unit?

• Mechanical items. These components are based on the CRAC unit type use.
• Refrigerant. The refrigerant levels of the CRAC units must be at least checked once every year.
• Air filters.
• Compressors.
• Electrical testing.

How big is a CRAC unit?

The total area occupied by a CRAC is 14 m2; hence approximately four CRACs would occupy the 59-m2 space. Two CRACs are duty, since N+2 is utilized; therefore, the available capacity would be 90 kW x 2 = 180 kW.

What is CRAC-II?

CRAC-II is both a computer code (titled Calculation of Reactor Accident Consequences) and the 1982 report of the simulation results performed by Sandia National Laboratories for the Nuclear Regulatory Commission.

What is a CRAC unit?

A CRAC unit is a critical piece of cooling equipment, consisting of filters, fans, coils, and an external direct expansion [dx] condenser, that is connected to a range of refrigerant pipework to precisely manage and control the temperature and humidity of a space within specified design tolerances.

What is the C2F of a CRAC deployment?

• Tier I (N)–one-sided CRAC deployment: C2F = 13 • Tier II-IV (N+1)–two-sided CRAC deployment: C2F = 11.4 • Tier II-IV (N+2 and above)–two-sided CRAC deployment: C2F = 9.8

What are the different types of CRAC configurations?

The variations analyzed included reference CRACs with no redundancy, with one redundant unit, and with two redundant units. For each of the CRAC configurations, three cabinet layouts were considered: maximum packed, average density, and high density).