Although free cooling technology is not new and widely used in many cooling water applications, there are a variety of ways to raise its efficiency, including adoption of innovative heat exchangers, engaging of the operation mode of partial free cooling, and application of advanced methods for free cooling control.
The critical condition to start free cooling operation is the moment when ambient temperature drops below return water temperature. In such a condition, free cooling system tops up cooling demand by running in parallel with compressors. Ambient temperature is monitored continuously to run fans as fast as possible and obtain free cooling to the maximum while keeping the compressors within the operating envelope or at lower frequency.
When ambient temperature falls enough for free cooling mode to fully satisfy cooling demand, compressors are switched off and the system keeps required water temperatures by regulating the speed of the fans and water flow of air-cooled chiller or cooling tower.
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