HFM, a global brand of heat transfer and fluid handling supply platform.

Free Cooling | For Data Center

Free Cooling – For Data Center

Optimizing Thermal Transfer Through Natural Cooling Sources

As data centers face rapidly increasing cooling demands and rising energy costs, free cooling has become a key strategy to reduce PUE and improve sustainability. By utilizing naturally cold outdoor air or water sources, free cooling reduces mechanical chiller load and enhances system efficiency.

HFM provides engineered heat-exchange solutions that integrate seamlessly into water-side and air-side free cooling architectures for modern data centers.

What Is Free Cooling?

Lower Energy Consumption, Higher Operational Efficiency

Free cooling leverages naturally low ambient temperatures to remove heat from data center cooling loops. It reduces or eliminates the need for compressor-based chillers, supporting greener and more cost-effective operations.

Free cooling typically operates in:

Economizer mode (partial free cooling)
Full free cooling mode (no mechanical refrigeration)

Free Cooling with Air

Free Cooling with Water

Comparison Dimension	Air Free Cooling	Water Free Cooling
Main Process / Role	Data center air circulation → heat removed directly via air heat exchanger to the outdoor environment	Server / liquid-cooled module internal loop → heat transferred via plate heat exchanger (BPHE/GPHE) to facility-side cooling water
Heat Exchanger Type	Air-cooled heat exchanger (Fin Coil / Dry Cooler)	Plate Heat Exchanger: BPHE (inside CDU) or GPHE (facility-side, high flow)
External Cooling Source	Outdoor air	Cooling tower water, dry cooler loop water, lake/river/sea water, groundwater
Key Advantages	Simple and easy to deploy with no water required, suitable for dry and cold climates, and reduces fan energy consumption	High heat exchange efficiency with small approach temperature achievable, precise temperature control, supports high-density liquid cooling, and ensures safe isolation between internal and facility loops
Typical Applications	Often used in small to medium-sized air-cooled data centers and compatible with CRAC/CRAH units	Suitable for liquid-cooled data centers and high-power-density applications, can integrate with Chiller, Cooling Tower, or Free Cooling hybrid operations, and improves energy efficiency while reducing PUE