NETWORK PC POWER MANAGEMENT

June 28, 2011Regional Technical Forum

Presented by: Bob TingleffSBW Consulting, Inc.

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 system5/3/2011

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

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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

5/3/2011

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 shift5/3/2011

5/3/2011

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 Procost load shapes: Office, K-12

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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

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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)5/3/2011

5/3/2011

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Recommendations

Set status to Active Sunset criteria

Desktop power draw will change Baseline rate of power management may

change 2 years max

5/3/2011

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.”