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Data center cooling
Data center cooling is a precision engineering challenge, not just providing cooling, but ensuring controlled, reliable heat removal under all conditions. Data centers are high-density thermal environments where nearly 100% of IT power is converted into sensible heat. With rack loads exceeding 20โ30 kW, traditional comfort cooling approaches are no longer applicable. The focus is on efficient heat extraction, airflow control, and system reliability.
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โข Air-Based Cooling (CRAC/CRAH)
The industry standard. Performance depends on air distribution effectiveness, not just installed capacity. Raised floor and overhead systems are commonly used.
โข Hot Aisle / Cold Aisle Containment
A critical airflow strategy that prevents mixing:
Cold air โ server inlets
Hot air โ isolated return
Improves thermal efficiency and eliminates hot spots.
โข Liquid Cooling
Adopted for high-density applications:
Direct-to-chip
Rear door heat exchangers
Immersion cooling
Offers superior heat transfer with reduced airflow dependency.
โข Economizer (Free Cooling)
Utilizes ambient conditions (air-side or water-side) to minimize mechanical cooling load and improve energy performance.
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Cooling load in kW (not TR)
Airflow management > cooling capacity
Redundancy: N+1 / 2N (no single point of failure)
Real-time thermal monitoring is essential
As per ASHRAE, wider temperature ranges enable optimized and energy-efficient operation.
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