Deemed Energy Savings and Cost-Effectiveness of 80-Plus Power Supplies

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Deemed Energy Savings and Cost-Effectiveness of 80-Plus Power Supplies

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Deemed Energy Savings and Cost-Effectiveness of 80-Plus Power Supplies

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Deemed Energy Savings and Cost-Effectiveness of 80-Plus Power Supplies

RTF January 2007

From Linear to Switching Power Supplies

- 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

- 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

- 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

- 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

- Update NEEA assumptions?
- Include indirect savings from power factor?
- Adopt Ecos estimate for servers?
- Estimate HVAC interactions?

- 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