A Computer Room Air Conditioner (CRAC) is a specialized cooling unit designed to maintain precise temperature and humidity control in data centers and server rooms. CRAC units control temperatures within 2°F and humidity between 35-65 percent RH, preventing equipment failures and data loss. Older CRAC models consume 3-5 watts per cooling watt, making them significantly less efficient than modern Computer Room Heat Exchangers (CRHE).
Technical Specifications
CRAC units feature refrigeration cycles with capacities ranging from 5 to 25 tons of cooling. They include independent humidity control through dehumidification systems and hot aisle/cold aisle containment integration. Raised floor installations allow cold air distribution beneath server racks. Precision cooling capabilities maintain temperature stability critical for server reliability and performance.
Modern Efficiency Standards
Current CRAC units achieve energy efficiency ratings of 1.5-2.5 watts per cooling watt through improved compressors and heat exchangers. Data centers increasingly adopt liquid cooling and free cooling alternatives that reduce energy consumption by 40-60 percent. CRAC units remain standard in facilities without infrastructure for advanced cooling methods, requiring regular maintenance of refrigerant systems and airflow optimization to maintain PUE ratings below 1.5.