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Energy-saving cold aisle type for computer rooms

Fiber and communications infrastructure knowledge brief Published 28 Aug 2025

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Cold aisle containment (CAC) improves energy efficiency by isolating cold air supply to server intakes, reducing cooling costs and enhancing equipment reliability.

Cold Aisle Layout

A cold aisle is formed by arranging server racks so that the fronts of the racks face each other, creating a corridor where cold air is delivered directly to the servers' intake vents. The hot air generated by servers is expelled into the adjacent hot aisle, preventing mixing of hot and cold air streams. This separation ensures that servers receive consistent inlet temperatures, which reduces thermal stress and extends equipment lifespan.

Cold Aisle Containment (CAC)Cold aisle containment involves enclosing the cold aisle with doors at the ends and a roof or partitions above. This traps the cold air in the aisle, forcing it to flow directly into server intakes. Benefits include: Energy savings: By preventing cold air from mixing with hot exhaust, cooling systems operate more efficiently, reducing fan and chiller energy use by 20–25%.

Consistent temperatures: Servers receive uniform cooling, improving reliability and reducing the risk of overheating. Retrofit-friendly: CAC is generally easier to implement in existing data centers, especially where overhead obstructions exist, and does not always require a raised floor. Comparison with Hot Aisle ContainmentWhile hot aisle containment (HAC) encloses the hot aisle to direct exhaust air back to cooling units, CAC focuses on protecting the cold air supply.

CA

C is often preferred for retrofits due to lower architectural requirements and simpler installation, though HAC may offer slightly higher thermal efficiency in new high-density data centers.

Implementation Tips

Use perforated rack doors to allow airflow into the cold aisle.

Ensure CRA

C units or air handlers are aligned with the cold aisle to supply conditioned air efficiently. Consider variable speed fans and economizers to maximize energy savings. Monitor inlet temperatures to optimize cooling system operation and prevent hotspots.

Conclusion

Implementing a cold aisle layout with containment is a proven strategy to reduce energy consumption, lower operating costs, and improve server reliability. It is particularly effective in both new and existing data centers, offering a practical approach to energy-efficient cooling while maintaining optimal performance for high-density computing environments.

Energy-saving cold aisle type for computer rooms - ROGER FIBRE ATELIER [PDF]

Energy-saving cold aisle type for computer rooms

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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