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Personal Computer Energy Conservation By Keith L. Phillips Senior Engineer (Retired) July 26, 2012

Pc energy conservation meijer

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Page 1: Pc energy conservation   meijer

Personal Computer Energy Conservation

By Keith L. PhillipsSenior Engineer (Retired)

July 26, 2012

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PC POWER USAGE

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Various Power usage comparison charts

In general a PC uses about 50% less power at the idle state. Dell OptiPlex 740 has an AMD processor which uses a little more energy than the Intel processor. This is still a lot of wasted energy when the PC is not in use. But when set to Sleep mode the power drops to a mere fraction (see chart) of the idling power usage.

Sleep mode power usage

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MONITOR POWER USAGE

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Add another 15-70 watts for an LCD monitor, of us are using two monitors so this figure is doubled (Note: using a “Screen Saver” does not save any power).

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The savings in energy from one PC at idle power of (approximately 120

watts) to about 3 watts when the PC is in the Sleep mode this is

considerable. Note a screen saver does not save any additional power

over a PC at the idle state. If a PC was in Sleep mode during non-work

hours (12 hours) this would be approximately 1.4 kWh times by 365 days

which would equal 512 kW’s. The average cost per kilowatt hour was 11

cents in April 2008 across the United States. (A kilowatt hour is if a

kilowatt is being used continuously for one hour.) So for one PC the cost

savings per year would be $56, Now multiply that times the number of

PC’s company wide (for example 200 PC’s would equal $11,264 per year

in savings).

ENERGY SAVINGS

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Consider that in 2010, the average annual electricity consumption for

a U.S. residential utility customer was 11,496 kWh, an average of 958

kilowatt-hours (kWh) per month. The energy saved from 200 PCs

could furnish 8.9 residential homes for a year.

OR

For every kWh of electricity produced there is an average of 2 lbs of

co2 put into the atmosphere from a coal fired power plant, for 200

PCs this mean 102 tons less of co2 released each year. There are also

many other waste byproducts which come from power production

which effect the environment.

TO PUT IT DIFFERENTLY

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As you can see our PC’s do consume a lot of power weather we are

using them or not. To conserve on our PC power usage there are

several steps we can take. It will take a few steps to setup a PC in

Sleep mode, the next screens will take you through the actual setup

procedure.

CONFIGURING YOUR PC IN THE SLEEP MODE

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SETTING UP YOUR PC IN SLEEP MODE

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•Click on Windows Icon

•Click on Control Panel

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SETTING UP YOUR PC IN SLEEP MODE

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•Click on Category•Click on Large icons

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SETTING UP YOUR PC IN SLEEP MODE

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•Click on Power Options

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SETTING UP YOUR PC IN SLEEP MODE

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•Adjust sleep setting times for display and computer •Click on Save changes icon at bottom

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Corporate networks occasionally need to update networked PCs during off hours, this can be an issue if the PCs are in the Sleep mode. But there are solutions to this, the network server will need to send a wake message to the PCs before the update and after the PCs are updated put the PCs back in the Sleep mode. This message (believe it or not) is called a “Magic Packet” by the computer industry. The IT shop can either write their own code (which is not difficult) or there are commercially available software which can do this.

CORPORATE NETWORK UPDATES