Article Overview
The recommended ambient temperature for cold aisles in data centers is typically between 18°C and 27°C (64.4°F–80.6°F), with a preferred range of 20°C–24°C (68°F–75°F) for optimal reliability and energy efficiency.
Recommended Temperature Ranges
Cold aisles are the areas in a data center where IT equipment intakes cool air, and they are designed to maintain the lowest air temperatures in the facility . According to ASHRAE guidelines, the recommended intake air temperature for servers and IT equipment is 18°C–27°C, with a narrower preferred range of 20°C–24°C to balance reliability and energy efficiency . The allowable range can extend slightly wider, but temperatures outside this range may compromise equipment performance or lifespan .
Practical Considerations
- Airflow Management: Cold aisle temperatures depend on proper airflow design. Perforated floor tiles should be aligned with rack intakes, and any openings in the raised floor or walls should be sealed to prevent hot air recirculation .
- Sensor Placement: Temperature sensors should be installed at the front of IT racks to accurately monitor intake air, as mid-aisle or return air temperatures do not reflect the actual cooling conditions experienced by the equipment .
- High-Density Racks: In high-density environments, a more restrictive temperature range of 18°C–22°C is recommended to prevent hotspots and ensure uniform cooling .
Additional Guidelines
- Humidity Control: Maintain relative humidity between 45%–55% to reduce risks of electrostatic discharge and condensation .
- Monitoring and Alerts: Use sensors and software tools to track temperature and humidity, with early warnings at 40%–60% RH and critical alerts at 30%–70% RH .
- Energy Efficiency: Operating at the higher end of the recommended range (closer to 27°C) can save energy, but only if airflow and monitoring are well-managed to avoid hotspots . Maintaining cold aisle temperatures within these ranges ensures optimal IT equipment performance, reduces the risk of thermal incidents, and supports energy-efficient data center operation.
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