Energy-saving sample of computer room cabling system

Using overhead cable trays instead of under-floor cabling can save up to 24% in energy consumption by improving airflow and reducing cooling load.

Overview of Energy-Saving Cabling Practices

A practical energy-saving cabling system for a computer room focuses on optimizing airflow, reducing obstructions, and improving cooling efficiency. Traditional raised-floor cabling often blocks cold air delivery to server racks, causing hot spots and forcing fans and cooling units to work harder. Over time, under-floor cabling accumulates, further restricting airflow and increasing energy consumption .

Sample Implementation

1. Overhead Cable Trays:

   • Power and data cables are routed above the racks using overhead trays.
   • This prevents blockage of cold air under the floor and allows more uniform cooling to server intakes.
   • Energy savings of approximately 24% can be achieved due to reduced fan and pump power requirements .

2. Hot Aisle/Cold Aisle Layout:

   • Server racks are arranged in alternating rows with cold air intakes facing the cold aisle and hot air exhausts facing the hot aisle.
   • Overhead cabling complements this layout by keeping the cold aisle unobstructed, improving cooling efficiency .

3. Cable Management and Maintenance:

   • Visible overhead cables are easier to maintain and reorganize, preventing accumulation of unused cables that can block airflow.
   • Proper labeling and routing reduce the need for additional cooling due to airflow disruption .

4. Integration with Cooling Systems:

   • Overhead cabling works well with in-row or overhead air conditioning units and hot aisle containment systems.
   • This ensures that cold air reaches server intakes efficiently, reducing the overall energy required for cooling .

Benefits

• Reduced Cooling Energy: Less obstruction under the floor allows fans and chillers to operate at lower power.
• Improved Airflow: Hot and cold aisles maintain consistent temperatures, reducing hotspots.
• Easier Maintenance: Overhead cabling is visible and accessible, minimizing downtime and improving long-term efficiency.
• Scalability: Adding new servers or network equipment does not require disturbing under-floor cabling, maintaining energy efficiency over time .

By implementing overhead cable trays combined with hot/cold aisle containment and disciplined cable management, a computer room can achieve significant energy savings while maintaining reliable operation and easier maintenance.