Lawrence Berkeley National Laboratory

This web site describes two pioneering demonstrations — hosted by Sun Microsystems — one where direct current is distributed at the facility level to racks of computers that have been modified to directly accept high voltage direct current (DC) and another where the DC power conversion occurs at the rack level and DC is then directly distributed to servers within the rack. In typical data centers, the loss in electrical power through conversions of alternating current (AC) to DC to AC to DC occurs for all power flowing to the IT equipment. Efficiency gains have a magnifying effect by reducing need for HVAC (e.g. 10% saving at the UPS level mean about 10% energy savings for the entire data center, compared to a very efficient AC baseline case and assuming the HVAC system consumes as much power as the IT equipment).


Overview Presentation

Final Report