ⓘ Energy Logic is a vendor-neutral approach to achieving energy efficiency in data centers. Developed and initially released in 2007, the Energy Logic efficiency ..

                                     

ⓘ Energy Logic

Energy Logic is a vendor-neutral approach to achieving energy efficiency in data centers. Developed and initially released in 2007, the Energy Logic efficiency model suggests ten holistic actions – encompassing IT equipment as well as traditional data center infrastructure – guided by the principles dictated by the "Cascade Effect."

                                     

1. Energy Logic Assumptions

The first iteration of the Energy Logic model was introduced by Emerson Network Power on November 29, 2007. Described as a" new approach to energy optimization,” the model was developed in response to industry feedback suggesting a growing emphasis on promoting efficiency initiatives, without compromising the performance and reliability of the data center.

The Energy Logic data center efficiency model was developed based on research and modeling of a 5.000 square foot data center, including average IT equipment densities, common data center and facility infrastructures and their collective energy draw.

Energy draw for the 5.000 square foot data center model was based on the following assumptions:

  • Data center has mix of servers ranging from new to 4-years old
  • Server refresh rate: 4 to 5 years
  • No virtualization or blades
  • No high-density loads
  • Average density: 3 kW/rack 120 W/sq. ft.
  • Total compute load: about 600 kW
  • UPS configuration: 2x750 kVA, 1+1 redundant
  • Floor-mount cooling connected to building chilled water plant
  • MV transformer 5 MVA at building entrance with switchgear
  • Hot-aisle/cold-aisle configuration
                                     

2. The Cascade Effect

Based on the benchmarks established by the 5.000 sq. ft. model, Emerson Network Power recommended improvements to IT and data center infrastructures capable of maximizing total energy savings by leveraging the" cascade effect.” For the purposes of the Energy Logic model, the cascade effect assumes that for every one watt of energy saved at the server component level, a data center can expect to realize up to 2.84 Watts in cumulative energy savings as the initial reduction" cascades” through the infrastructure.

                                     

3. Energy Logic Actions

The Energy Logic model proposes ten vendor-neutral actions that are forecast to reduce cumulative energy consumption by up to 50 percent reducing energy consumption to 585 kW from the data centers initial 1.127 kW load. The ten recommended actions prescribed in the Energy Logic model are:

  • Establishing an efficient power distribution architecture yields a 3 percent savings
  • Deploying high-density supplemental cooling yields an 18 percent savings
  • Deploying high efficiency power supplies matched to power needs yields a 12 percent savings
  • Integrating IT equipment with low-power processors yields a 10 percent savings
  • Deploying variable capacity cooing equipment including chilled-water and direct-expansion systems yields a 7 percent savings
  • Implementing a data center monitoring and optimization strategy yields a 2 percent savings
  • Deploying blade servers yields a 1 percent savings
  • Implementing server virtualization throughout the IT infrastructure yields a 14 percent savings
  • Implementing a server power management system/strategy yields an 11 percent savings
  • Implementing data center cooling best practices yields a 2 percent savings

The Energy Logic model also suggests additional opportunities for energy savings, including:

  • Implementing economizers for subsidized cooling
  • Identifying and disconnecting unused servers
  • Monitoring and reducing energy losses tied to facility infrastructure
  • Consolidating data storage


                                     

4. Energy Logic 2.0

In 2012, Emerson Network Power introduced an update to the Energy Logic model, to take into consideration advances in IT and data center infrastructure technology.

Using the same 5.000 square foot data center benchmarked in the 2007 model, Energy Logic 2.0 updates the ten prescribed actions to reflect current technologies and average equipment efficiency. As a result, the updated actions are forecast to yield energy savings up to 74 percent reducing energy consumption from 1.543 kW to 408 kW in the model data center.

The ten updated actions include:

  • Establishing a high-density cooling infrastructure yields a 1.5 percent energy savings
  • Implementing a server power management system/strategy yields a 9.4 percent energy savings
  • Deploying high-efficiency power supplies matched to power needs yields a 7.1 percent energy savings
  • Implementing a temperature and airflow management strategy yields a 5.2 percent energy savings
  • Optimizing the data centers power architecture yields a 4.1 percent energy savings
  • Implementing a server virtualization and consolidation strategy yields a 29 percent energy savings
  • Deploying low-power components yields a. 11.2 percent energy savings
  • Deploying variable-capacity cooing equipment including chilled-water and direct-expansion systems yields a 2.6 percent energy savings
  • Implementing a comprehensive Data Center Infrastructure Management DCIM strategy
  • Establishing an ICT architecture yields a 3.5 percent energy savings
                                     
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