What Is Indirect Free Cooling?
Indirect Free Cooling uses the naturally low temperature of outdoor air to cool your facility through a closed water or glycol circuit. Unlike direct systems, the outdoor air never enters the data hall, eliminating risks from dust, humidity, or contamination.
Select location
Select chiller
Chiller
Select CHW temperatures
Inlet
Outlet
Information
Room temperature
Load
Electricity price
Share of operation modes per year
Dynamic Operating Modes
STULZ pioneered Indirect Dynamic Free Cooling, which continuously selects the optimal mode of operation to maximize energy savings and uptime:
-
Free Cooling Mode
Cooling exclusively through outdoor air via the hydraulic circuit, no compressors required. -
Extended Free Cooling
Increased pump and fan performance extends the hours of Free Cooling availability. -
Mixed Mode
Free Cooling and compressors work in parallel to cover high loads efficiently. -
Compressor Mode
Full compressor operation when outdoor conditions are no longer favorable.
The Free Cooling system with dynamic switching operation and control
In classic precision cooling, the necessary cold is created independently of the outside temperature by means of mechanical cooling. The most energy-intensive component here is the compressor.
To reduce mechanical cooling to a minimum, STULZ developed a Free Cooling system with dynamic switching operation and control for in-house units. This controls all active components, dependent on the outside air temperature and current heat load.