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Deemed Energy Savings and Cost-Effectiveness of 80-Plus Power Supplies. RTF January 2007. From Linear to Switching Power Supplies. Published Estimates. Ecos (August 2005) 82 kWh per unit residential 90 kWh per unit commercial 85 kWh weighted average NEEA (March 2005)

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published estimates
Published Estimates
  • Ecos (August 2005)
    • 82 kWh per unit residential
    • 90 kWh per unit commercial
    • 85 kWh weighted average
  • NEEA (March 2005)
    • 76 kWh per unit residential
    • 88 kWh per unit commercial
    • 74 kWh per unit commercial with network off
    • 82 kWh per unit weighted average net of network off
key factors for binned savings estimates
Key Factors for Binned Savings Estimates
  • Hours in each power consumption bin
    • Developed by Intel & Ecos
    • Set to fit total consumption
  • Total consumption based on several sources
    • Roth 2002, LBL for Energy Star, Ecos
  • Efficiency by power consumption bin
    • Base case: Intel 2005 required efficiency
    • 80-Plus: Bench tests conducted by EPRI-PEAC
  • Time in standby mode
    • LBL “After Hours” report
changes since estimates
Changes Since Estimates
  • Higher computer power requirements
    • Increase savings
  • Improving efficiency of non 80-Plus power supplies
    • Decrease savings
  • Identified added savings from power factor correction
    • Add ~25 kWh
  • Penetration of network off-hours control
    • Unknown
cost estimates
Cost Estimates
  • Incremental cost of $5/unit
    • Declining to $2.50 by 2010
  • NEEA program costs estimates ~ $40 per unit
  • Lifetime: 4 years
  • No O&M costs
  • NEEA B/C ratio: Over 5.0 for venture plus market effects
issues
Issues
  • Update NEEA assumptions?
  • Include indirect savings from power factor?
  • Adopt Ecos estimate for servers?
  • Estimate HVAC interactions?
recommendations
Recommendations
  • Stick with NEEA estimate for now
  • Ignore savings from power factor correction until Ecos adopts them
  • Ignore HVAC interaction
  • Review Ecos server application savings when programs are deployed for servers