EC Fan Case Studies

Challenge

The existing AHU system used legacy AC motors with fixed-speed drives, resulting in high electricity bills and inconsistent airflow distribution across 12 floors.

Solution

Transmonk replaced the existing AC fan assemblies with EC backward-curved centrifugal fans (TM-BC series) across 8 AHUs. Each unit was paired with a Transmonk smart controller enabling demand-based speed modulation via BMS integration.

Results

• ✓40% reduction in AHU energy consumption within the first quarter
• ✓Consistent airflow across all floors with automatic load balancing
• ✓ROI achieved within 14 months of installation
• ✓Noise levels reduced by ~8 dB(A) compared to legacy AC fans

Challenge

Cooling accounted for over 45% of total energy usage. Existing axial fans ran at fixed speed regardless of server load, leading to overcooling during off-peak hours and hot spots during peak loads.

Solution

Transmonk deployed TM-AX series EC axial fans in the raised-floor plenum. Integrated with temperature sensors and BMS, the fans auto-modulate speed based on real-time rack inlet temperatures.

Results

• ✓32% reduction in cooling-related energy costs
• ✓Eliminated hot-spot occurrences reported over a 6-month period
• ✓PUE improved from 1.85 to 1.58
• ✓Fan maintenance intervals extended from 6 months to 18 months

Challenge

The existing FFU (Fan Filter Unit) setup could not maintain consistent laminar airflow at the required ISO Class 7 specification. Frequent motor burnouts caused production downtime.

Solution

Transmonk installed EC motorised impellers inside each FFU, replacing the unreliable AC shaded-pole motors. A central Transmonk controller now governs all 60 FFUs with group and individual speed control.

Results

• ✓Achieved and maintained ISO Class 7 compliance consistently
• ✓Zero unplanned fan downtime over 12 months post-installation
• ✓35% energy savings on the FFU power line
• ✓Production uptime improved by 18% year-over-year