Post on 02-Jan-2016
transcript
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
5/3/2011
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
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
5/3/2011
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
5/3/2011
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
Prev
ious
Curre
nt, n
o HVAC
K-12
Scho
ol -
Elec
tric h
eat
K-12
Scho
ol -
Heat p
ump
K-12
Scho
ol -
Gas h
eat
Larg
e Offi
ce -
Elec
tric h
eat
Larg
e Offi
ce -
Heat p
ump
Larg
e Offi
ce -
Gas h
eat
Other
- El
ectri
c hea
t
Other
- Hea
t pum
p
Other
- Gas
hea
t0
20
40
60
80
100
120
140
160
180
200
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