Indirect Evaporative Cooler for Data CenterIndirect Evaporative Cooling
An indirect evaporative cooler that does not directly introduce outdoor humid air, delivering sub-wet-bulb outlet water temperature.
The IE series is a core product launched by LANXUN for the data-center energy-saving and PUE-reduction strategy. It uses indirect evaporative cooling technology — outdoor air and spray water exchange heat and moisture in the wet channel, and the cooled wet-channel air then cools the circulating air (or cooling water) in the dry channel on the other side through the heat-exchanger wall, without directly introducing outdoor humid air into the data center. This technology produces "sub-wet-bulb" cooling medium approaching the ambient dew-point temperature, greatly reducing the compressor refrigeration load. Equipped with stepless EC fan speed control, variable-flow nozzles, and a high-altitude-adapted centrifugal fan, a single unit covers 80–400m³/h, with the Type II extended to larger capacity.
Key Highlights
Indirect Evaporative Cooling (Sub-Wet-Bulb Outlet)
The cooling medium does not directly contact outdoor air; outlet water temperature approaches the ambient dew-point temperature, 3–5°C lower than a conventional cooling tower.
Reduced Refrigeration Energy
Sub-wet-bulb outlet extends annual Free Cooling hours, helping data centers reduce PUE below 1.15 and saving millions of yuan in annual electricity costs.
EC Fan Stepless Speed Control
Standard EC brushless DC motors with 0–100% stepless speed control greatly reduce part-load power consumption, adapting to fluctuating AI-computing loads.
Variable-Flow Nozzles + High-Altitude Adaptation
Adaptive variable-flow nozzles adapt to different water pressures; optional high-altitude centrifugal fan operates stably above 3000m elevation.
Working Principle and Structural Features
The following content is excerpted from the Indirect Evaporative Cooler for Data Center product manual
Working Principle
The LANXUN indirect evaporative cooler uses the latest advanced heat-exchange technology and is a high-efficiency heat-exchange device using water and air as cooling media: after being cooled by counter/cross flow, it enters the surface cooler, where high-temperature cooling water exchanges heat with the hot humid air outside the surface cooler. The equipment contains two water distribution systems, a surface-cooler heat exchanger, fill heat exchange, a drift eliminator, and a water guide trough; externally there are a circulating water pump, guide pipe, valves, etc.; and the top has an axial fan and an EC fan.
During normal operation, circulating water enters the counter-flow water distributor through the inlet pipe and is evenly sprinkled onto the spray fill through nozzles; outside cold air enters through the side intake mesh, crosses the sprinkling area, turns vertically upward into the sprinkling fill, and exchanges heat with the cooling water sprayed in the fill; part of the cooling water vaporizes into vapor, and evaporation carries away a large amount of heat, which is discharged into the atmosphere by the top axial fan, while the water in the hot air is intercepted by the drift eliminator.
The cooling water after heat exchange falls into the water guide trough and is led to the cross-flow tower distribution basin, where it is evenly sprinkled onto the spray fill by cross-flow nozzles for a second heat exchange, and the hot humid air is discharged by the EC fan; the cooling water in the collection basin is then sent by the circulating water pump to the surface cooler, exchanges heat with the hot humid air outside the surface cooler, and is pumped to the top distribution basin to be sprinkled again onto the spray fill for heat exchange; this cycle repeats, bringing the cooling water temperature in the collection basin down to an extreme.
High-Efficiency EC Fan
The EC motor is highly efficient and energy-saving at both full and part load, with stepless speed control; multiple fans ensure reliability—if one fails, the others increase speed to compensate for airflow; the components have a special coating for protection and withstand high humidity.
Variable-Flow Nozzle
A longitudinal downpipe is added to the water outlet holes distributed across the distribution pan plane, so that no matter how the water volume in the pan changes, each nozzle always receives water, and a single unit maintains almost 100% fill utilization; there are no moving parts, so it is not prone to clogging.
High-Efficiency Heat-Exchange Surface Cooler
Uses a serpentine bent-tube copper tube design; the round tubes increase the heat-exchange area and reduce air-flow resistance; the coil undergoes three 2.5MPa pressure tests to ensure no leakage; aluminum fins are fitted outside the copper tubes to increase the heat-exchange area.
Air Inlet Grille
Made of corrosion-resistant PVC and ABS with reasonable spacing, resistance to clogging, and easy disassembly; the scientific angle design avoids direct sunlight and prevents algae growth; the special structure keeps the drift rate below 0.001%.
PVC/PP Spray Fill
Combines air guiding, heat dissipation, and water collection in one, with low ventilation resistance; the water flow has a long heat-exchange time (flow path height 2500~3500mm); a 30° inclined honeycomb air inlet at the air-inlet end prevents algae; hanging installation without bonding.
High-Position Water Collection Guide Trough
A high-position water collection device intercepts, guides, and gathers the cooling water falling from the bottom of the fill into the cross-flow distribution basin; the parts and materials support normal operation from -20℃ to 60℃ and withstand the extreme load of ice accumulation with full water in winter.
Technical Specifications
| Model | Cooling Water Flow (m³/h) | EC Fans (units) | Total Power (kW) | Dimensions L×W×H (mm) | Operating Weight (kg) | Outlet Water Temp (°C) |
|---|---|---|---|---|---|---|
| IE-80 | 80 | 2 | 3.0 | 3200×2200×3000 | 3500 | ≤28 |
| IE-110 | 110 | 2 | 4.0 | 3400×2400×3200 | 4000 | ≤28 |
| IE-140 | 140 | 3 | 5.5 | 3600×2600×3400 | 4600 | ≤28 |
| IE-170 | 170 | 3 | 7.5 | 3800×2800×3600 | 5200 | ≤28 |
| IE-210 | 210 | 4 | 7.5 | 4000×3000×3800 | 5900 | ≤28 |
| IE-250 | 250 | 4 | 11.0 | 4200×3200×4000 | 6600 | ≤28 |
| IE-300 | 300 | 6 | 11.0 | 4400×3400×4200 | 7400 | ≤28 |
| IE-350 | 350 | 6 | 15.0 | 4600×3600×4400 | 8200 | ≤28 |
| IE-400 | 400 | 8 | 15.0 | 4800×3800×4600 | 9000 | ≤28 |
| IE-II-300 | 300 | 4 | 11.0 | 4400×3400×4500 | 7800 | ≤26 |
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Images are from the Indirect Evaporative Cooler for Data Center product manual
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