Case Study – Saving Data Center Energy & IT Cooling Capacity

Posted by Chris Parlee on Jun 2, 2011


The Hanover Insurance Group was looking to improve their data center’s cooling efficiency, as well as the current system’s capacity – while allowing for increased IT (Information Technology) equipment densities within their data center at their headquarters in Worcester, MA.

Demand Based Cooling system diagram
EEC, working closely with The Hanover, recommended a unique solution that could not only save energy and eliminate hot spots, but also maximize IT cooling capacity in the data center. The system featured a series of networked underfloor and overhead air movers, server rack and Computer Room Air Conditioner (CRAC) temperature sensors, sensor hubs, CRAC controllers and Environmental Management Software.

The Challenge:

  • Integrate new energy-efficiency technology within the data center, without affecting day-to-day operations
  • Eliminate all the data center’s hot spots
  • Achieve all this without making major changes to the existing data center infrastructure
  • Meet the Company’s less-than-24-months economic payback criteria

Summary of Project:

  • Cost of project: $144,000.00
  • Estimated annual savings: 600,000 kWh
  • Utility incentive: $21,500.00
  • Company payback: 16 months (with rebate)


  • Five out of 13 CRAC units were placed into hot-standby, and energy usage for cooling the data center was reduced by 27%
  • Increased cooling redundancy
  • Increased IT load capacity by 70kW
  • IT equipment is thermally safe
  • 24x7 monitoring allowing for automated CRAC unit response
  • Energy incentive from the National Grid Commercial Energy Efficiency Program


Tags: Data Center, data center cooling, data center hot spots