The data center has 86 30-ton CRAHs, and it was cost-effective to install variable-speed fans in those systems, which allow them to be turned up and down as needed. 'We also worked with the utility provider to get a rebate, which made it worthwhile," said Rick Rehyner, senior manager for eBay's global data center operations.
Utilities offer rebates to companies that install energy-saving products because it helps them avoid having to construct new power plants or buy power from a neighboring utilities at higher rates.
The project reduced total power consumption at eBay's data center by 16 percent and carbon emissions by about the same amount, Rehyner said. Over the 18-month life of the project its total IT power load increased 50 percent (because more servers were added during that time) but the power load for the whole data center increased only 25 percent, because it used less power for cooling.
The Data Center Energy Efficiency Summit is in its third year and is a place for data center operators to share tips for reducing energy use. Other topics this year were data center consolidation, and updates that are coming to the PUE efficiency metric and to the LEED certification program for green buildings.