Tuesday, November 17, 2009

Energy-Efficient DataCenter Designs

One of the conventional wisdoms is that DC power is more efficient than AC power because DC distribution goes through fewer conversions. A paper from Lawrence Berkeley National Laboratory shows that DC distribution systems are about 7% more efficient than "best in class" AC UPSs and 28% more efficient than AC distribution systems typically found in data centers. A task group of the Green Grid, an IT industry consortium that's looking to standardize on energy efficiency metrics, processes, and technologies, takes issue with parts of Lawrence Berkeley's study. The task force argues that well designed DC and AC systems using current technology can actually be within 5% to 7% efficiency of each other. More>