# Presentation: 233802

## Data Center Energy Efficiency Metrics

**Data Center Energy Efficiency Metrics**
**ASHRAE**
**June 24, 2008**

** **
*** ***
**Bill Tschudi**
**Lawrence Berkeley National Laboratory**
**wftschudi@lbl.gov**
** **

##   Metrics in use

-   Metrics in use
-   DOE Save Energy Now
-   EPA Energy Star for Buildings
-   LBNL Benchmarking

## DOE Save Energy Now “DC Pro” key elements

*Data Center Performance*
- Overall energy performance (baseline) of data center
- Performance of IT & infrastructure subsystems compared to benchmarks
- Potential areas for efficiency improvement
- Energy cost ($), source energy (Btu), and carbon emissions (Mtons)

***IT Module***
- Servers
- Storage & networking hardware
- Software

***Power Systems***
- UPS
- Distribution

***Cooling***
- Chillers
- CRAC units
- Fan power

***Energy Source***
- Source of power
- Distributed generation
- Cost per kWh
- Backup power

## DCIE - (rating your data center)

- DCiE = IT Energy/Total Data	Center Energy

**Notes:**
[Say something about how DC Pro constructs this chart.]

## Other Data Center Metrics:

- Power distribution: UPS efficiency, IT power supply efficiency
- HVAC
- IT total/HVAC total
- Fan watts/cfm
- Pump watts/gpm
- Chiller plant (chiller or overall HVAC system) kW/ton
- Lighting watts/square foot
- Rack cooling index (fraction of IT within ASHRAE recommended temperature range)
- Return temperature index (RAT-SAT)/ITΔT (a measure of mixing of air in the data center)

##  ENERGY STAR for BUILDINGS

-  ENERGY STAR for BUILDINGS

- Westin San Francisco Airport
- Millbrae, CA

- Shriner’s Hospital for Children
- Houston, TX

- Twin Peaks Charter Academy
- Longmont, CO

- AEGON Center
- Louisville, KY

## EPA’s Energy Performance Rating System 

- Obtaining data on IT energy use and total data center energy use for large sample of data centers (voluntary effort) over 12-month period
- Collecting data to analyze key variables.  Adjustments may be made to account for factors such as climate or tier level
- Rank performance on scale of 1-to-100 where one point represents one percentile of the sample
- Top quartile eligible for Energy Star label
- Usable for both stand-alone data centers and data centers housed within office or other buildings
- Data must be measured in a consistent way
- To date 100 organizations with over 198 centers are participating

## Data Needed to Build Rating

- Required data
- Climate zone (zip code)
- Type of data center (function)
- Reliability (Tier Level)
- Total IT plug energy (12 months of data)
- Total facility energy usage (12 months of data for all fuels)
- Data needed from a wide variety of facilities (large/small, stand-alone/within larger bldg, etc.)
- EPA estimates that good data from at least 100 data centers is needed in order to develop the rating

## ENERGY STAR Data Center Rating Goals

- Ideal high level metric: kBtu / useful work
- Challenge: how to measure “useful work”?
- Next Steps
- Agree on “useful work” – challenge industry to reach consensus
- Implement working metrics for end users while industry determines definition of “useful work”

## LBNL Benchmarking - Energy End Use

- The relative percentages of the energy actually doing computing vary considerably.

## Data center infrastructure efficiency (DCiE)

**Average .57**

- Higher is better

- Source:  LBNL Benchmarking

## DOE Data Center program

- Paul Scheihing
- _[www.eere.energy.gov/industry](http://www.eere.energy.gov/industry)_
- _[paul.scheihing@ee.doe.gov](mailto:paul.scheihing@ee.doe.gov)_
- 202-586-7234

- _Energy Star Buildings Program_
- Mike Zatz
- _[www.energystar.gov](http://www.energystar.gov/datacenters)__[/datacenters](http://www.energystar.gov/datacenters)_
- _[zatz.michael@epa.gov](mailto:michael.zatz@epa.gov)_
- 202-343-9152

- _Lawrence Berkeley National Laboratory_
- Bill Tschudi
- http://hightech.lbl.gov/datacenters.html
- wftschudi@lbl.gov
- 510-495-2417

- DC Pro tool: _[www.eere.energy.gov](http://www.eere.energy.gov/datacenters)__[/datacenters](http://www.eere.energy.gov/datacenters)_