Free cooling · Economizer
Using cool outside air or water to reject heat without running mechanical chillers, saving energy in mild conditions.
Current numbers
~3–5 °CTypical CDU heat-exchanger approach; a lower approach allows warmer facility water and more free cooling
52.8% modeled for Jan–Mar and Nov–Dec; 42.0% measured in a separate 42-day trialWater-side economizing at one Suwon laboratory building: modeled saving over the five economizer months, and a separate measured 42-day trial