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Network PC Power Management. June 28, 2011 Regional Technical Forum Presented by: Bob Tingleff SBW Consulting, Inc. Status. Provisionally deemed UES since May, 2010 SBW presented an update May, 2011 Incorporated Cadmus/PSE and Avista studies

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network pc power management

Network PC Power Management

June 28, 2011

Regional Technical Forum

Presented by: Bob Tingleff

SBW Consulting, Inc.

status
Status
  • Provisionally deemed UES since May, 2010
  • SBW presented an update May, 2011
    • Incorporated Cadmus/PSE and Avista studies
    • Minor changes based on review of literature
    • HVAC factor findings
      • Different than lighting
      • Difficult to pin down
  • RTF Decision: Use lighting HVAC factors
    • Large office, K-12, Other (small office/RTU HVAC)
    • This path incorporates an impact appropriate to building type/HVAC system
measure definition 9 measures rather than 1 due to hvac factors
Measure Definition – 9 measures rather than 1 due to HVAC factors
  • 3 building/business types
    • Large Office (central HVAC)
    • K-12
    • Other, represented by Small Office (RTU)
  • 3 HVAC system types
    • Electric
    • Heat pump
    • Gas
key parameters
Key Parameters
  • Power draw of desktop
    • Mix of Class A, B, C, D, Energy Star compliant and not
  • Power draw of monitor
    • 2008 E-Star LCD (lower power when sleeping)
  • Baseline time spent in low and high power
  • Shift in annual hours due to measure
    • 23% of annual hours shift from high to low power
    • Supported by Cadmus/PSE study
    • Consistent with earlier studies
key parameters1
Key Parameters
  • Rate of successful installation of power management software
    • May change over time – new computers, software defeated intentionally or accidentally, bugs, IT diligence
    • No empirical basis for measure persistence
    • Load shapes show far from complete success (next slide)
    • Previous analysis derated savings based on an assumed installation rate
      • Current analysis already includes the installation rate in the average hourly shift
do we need to adjust savings by business type
Do we need to adjust savings by business type?
  • Because of HVAC factors we now have K-12, Large Office, Other (small office HVAC)
  • Annual and daily schedules differ
    • Adjusting the overall load shape to match K-12, office results in an annual savings difference of 5%
    • Other schedules are hard to quantify
  • => Use office hours for all measures
  • Two Procostload shapes: Office, K-12
savings impact
Savings Impact
  • Without HVAC factors: 26% increase
    • Monitor savings increased from 11 kWh/yr. to 18
      • Lower power draw in sleep mode in newer monitors
    • Previous analysis derrated savings by assumed installation rate of power management software
      • This analysis finds that empirical studies already incorporate this factor
    • Newer computers have lower sleep-mode power
    • New studies find a couple more percent shifted to low power by measure
savings impact difference with cadmus pse study
Savings Impact: Difference with Cadmus/PSE study
  • Cadmus: 128 kWh/yr.
  • This analysis: 145 kWh/yr.
  • Monitor savings: 18 kWh/yr. vs. 11
  • Idle power draw of desktop: 64W vs. 60W
    • 64W is based on sales data
    • Could argue that schools and other likely environments will buy smaller computers
    • Don’t really know the mix
    • Cadmus data show many computers at 80W or more (63W average at non-participant sites)
recommendations
Recommendations
  • Set status to Active
  • Sunset criteria
    • Desktop power draw will change
    • Baseline rate of power management may change
    • 2 years max
rtf proposed motion
RTF Proposed Motion:

“I _________ move that the RTF approve the Network PC Power Management UES measure to Active status with a sunset date of July, 2013.”

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