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Two-stage evaporative cooling
Cooling up to 7 ℃ deeper with 60% less moisture
There are several ways to apply the evaporative cooling process:
- direct evaporative cooling
- indirect evaporative cooling
- indirect/direct evaporative cooling, also known as two-stage evaporative cooling
Below you will find a description of these three methods and read about the benefits of Oxycom's patented two-stage evaporative cooling.
Direct evaporative cooling
Direct evaporative cooling, also known as direct adiabatic cooling or wet bulb cooling, is called direct as there is direct contact between the water and the air stream. During the direct evaporative cooling process, water is evaporated directly into the air stream that needs to be cooled down. This type of evaporative cooling is the most widely used form worldwide.
Oxycom uses direct evaporative cooling in the PreCooll system, with which outside air is sucked through wetted Oxyvap® media, to cool down the incoming air and increase the efficiency of mechanical cooling installations. The Oxyvap® media contains the patented aluminum hydro chill fin technology reaching extreme efficiencies of 90 – 92 % while having the lowest possible pressure drop of around 40 Pa at 2m per second.
Indirect evaporative cooling
During the indirect evaporative cooling process, water is evaporated in a stream of air that is separate from the incoming outside air stream. The humid air in the evaporated air stream cools down the channel surface through which the outside air is blown in, which in turn cools down the outside air stream.
Two-stage evaporative cooling
Two-stage evaporative cooling, also known as indirect/direct adiabatic cooling, makes use of both techniques described above to cool the air. The first indirect adiabatic "cooling step" uses cold recirculation water in a heat exchanger to pre-cool the ambient air. Because no moisture is added, the air reaches a lower dry bulb and wet bulb temperature than the outside air, when leaving the heat exchanger. The second direct adiabatic "cooling step" cools the air even further through the wet pads (Oxyvap media®). As a result of this two-step cooling process, the air can be brought down to a much lower temperature, while the increase in moisture is significantly lower. Oxycom's IntrCooll makes use of two-stage evaporative cooling.
Benefits of IntrCooll: Oxycom's two-stage evaporative cooling system
- Environmentally friendly alternative, with 90% lower energy consumption
- Cools up to 7 ℃ deeper than single-step systems
- Brings up to 60% less moisture in the supplied air than direct systems
- Up to 30% less water consumption than single-step systems
