Network pc power management
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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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