Session 10: Energy Efficiency in
Information Technology
Equipment
Agenda
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What is Green IT?
Defining End User Devices
Power Consumption
Power Management
Mobile Computing
Printing
Where to next?
What is Green IT?
“Green IT is the conscious
implementation of technologies,
techniques and policies designed to
reduce the carbon footprint of the IT
function within the organisation …
… and the use of IT to reduce the carbon
footprint of the whole organisation”
End User Efficiencies
• Desktop computing
• Mobile computing
• Printing
Power Consumption
• PCs, Displays, Printers and other
components
• How is power measured?
• How much does it cost?
• What is the annual cost?
Power Consumption Example
• Assumptions:
– Energy is charged at 20c per kWh
– 1 PC uses 100W
• What is the cost for 100 PCs for one 8
hour day?
• What is the cost per year?
Power Consumption Example
Solution
• Energy per PC per hour:
100W x 1hr = 100Wh = 0.1kWh
• Cost per PC per hour: 0.1kWh x 20c = 2c
• Cost per PC per 8 hour day: 2c x 8hr = 16c
• Cost for 100 PC per day: 100 x 16c = $16.00
• Cost for 100 PC per year: $16 x 365 = $5840
Component Power
System Unit Type
(without monitor)
Power
Consumption
(Watts)
Conventional Desktop
PC – no power
management
110W
Conventional Desktop
PC – power
management
90W
“Green PC”
80W
Laptop PC
60W
Notebook PC
40W
Thin Client
15W
Monitor type
Power
Consumption
(Watts)
Conventional CRT
monitor – 19 inch
140W
Conventional CRT
monitor - 17 inch
80W
LCD Monitor – 19 inch
50W
LCD Monitor – 17 inch
30W
OLED Monitor
10W
Figures at as 2008
Activity 1
• Measure power consumption of
desktop appliances
Power Management
• All modern operating systems
have power management facilities
built in
• Decreases power consumption by
more than 50%
• Reduces the need for cooling
Should you Turn Them Off?
• Turning PCs off will reduce the power
consumption but will reduce
productivity
• Use power management during work
hours and turn off at other times.
• Use Server Policies to force shutdown
after hours
ComputersOff.org
• Did you know that putting your PC to
“sleep” or turning it off when you’re not
using it, can save you up to $80 on
your power bill and reduce your
computer’s carbon emissions by up to
100kg over 12 months. That’s the same
amount of C02 you emit by flying from
Sydney to Canberra!
(www.computersoff.org)
Mobile Computing
• Laptops, Netbooks and PDAs
• Use less power than desktops but can still
have savings
• Use power adapter when possible
• Turn off features when not in use
• Use wired network if possible
• Enables teleworking, reduces travel
• Shorter life span means more disposal
Printers and Print Management
• Does duplex printing help?
• Don’t print as much and use print
settings to reduce output
• Use fewer printers with better
power management.
• Use billing to change behaviour
Activity 2
• Make calculations using
EnergyStar website
• Make suggestions for reducing
power consumption – this must
be submitted for assessment.
Other ways of reducing the
Carbon Footprint
• Procurement
• Reuse, refurbish, redeploy and
recycle
• Ethical Disposal
• Video – Toxic Trade
http://www.pbs.org/frontlineworld/stories/ghana804/video/video_index.html
Other energy efficiency/ IT
topics
• Datacentre power consumption
– Virtualisation
– Cooling
– Cloud Computing
• IT as an enabler for reducing enterprise
carbon footprint
– Carbon Emissions Reporting
– Teleworking
Useful websites
• http://www.energystar.gov.au/products/co
mputers.html
• http://michaelbluejay.com/electricity/compu
ters.html
• http://www.computersoff.org/