Cold aisle containment encloses the front of server racks to contain cool supply air at 55 to 65 degrees Fahrenheit, preventing mixing with warm return air and improving cooling efficiency. This strategy directs chilled air directly across server intake fans. Cold aisle containment achieves similar energy savings to hot aisle containment while offering easier installation in some facility layouts.
Configuration and Design
Plastic or metal panels and sliding doors surround the front of server racks, creating isolated cold zones. Sealed enclosures reduce bypass air leakage to 5 to 10 percent compared to 20 to 30 percent in traditional open layouts. Pressurized containment systems push slightly cool air toward server intakes at controlled flow rates. Ducting directs supply air from computer room air handling units (CRAHUs) into the contained space.
Efficiency Gains
Cold aisle containment reduces cooling unit output requirements by 20 to 30 percent. Temperature differentials between supply and return air increase from 10 degrees to 20 degrees Fahrenheit, indicating efficient heat capture. Energy consumption decreases 15 to 25 percent when properly implemented with variable speed fans.
Installation and Maintenance
Cold aisle containment costs 6,000 to 12,000 dollars per row, with quicker installation than hot aisle systems. Equipment accessibility remains high, and contained design accommodates future upgrades easily. Return on investment typically occurs within 18 to 30 months through operational energy savings.