Driving Down Power Usage Effectiveness (PUE)
Hyper-scale data centers consume massive amounts of electricity, with mechanical refrigeration (chillers) accounting for up to 40% of the load. To drive the Power Usage Effectiveness (PUE) closer to the ideal 1.0, engineers deploy Two-Stage Indirect/Direct Evaporative Cooling (IDEC) units, leveraging the latent heat of vaporization to cool server racks for a fraction of the electrical cost.
Isolating the Server Environment from Humidity
Data center servers cannot tolerate high humidity or airborne contaminants. The IDEC system utilizes a sensible heat exchanger (the indirect stage) to cool the recirculated data center air using the thermal mass of the outside air, without ever mixing the two airstreams. Only when ambient temperatures peak does the direct evaporative stage engage, maximizing free-cooling hours while strictly controlling internal psychrometrics.