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The University of Denver Computing Guide WindTurbine


Power Usage

A typical desktop PC system is comprised of the computer itself (CPU or the box) and a monitor.  Your CPU may require anywhere from 50 to 150 Watts of electric power.  Add 50 to 150 Watts for a 17 inch color monitor.  A typical laptop uses roughly 45 Watts.

Thus, a typical desktop PC system can use electricity at
a rate upwards of 100-300 Watts per hour.  The average laptop uses 45 Watts.  With electricity rates averaging around $.07 per kiloWatt (1000 Watts), we can calculate and average computer’s cost with the following calculation:

 (Assume a desktop computer uses 200 W/hour and a laptop uses 45 W/hour).2 kWh * 24 hrs/day * 365 days/yr * $.07/kWh = roughly $125 per year per desktop

  • .045 kWh * 24 hrs/day * 365 days/yr * $.07/kWh = roughly $28 per year per laptop

-DU has roughly 10,000 laptops on campus and 2,500 desktops.  This means we spend roughly $592,500 on computer costs in one year alone.

- If we were able to reduce our computers run time to a normal 8 hour work day, the calculation looks as follows:

  • .2 kWh * 8 hrs/day * 365 days/yr * $.07/kWh = roughly $40 per year
  • .045 kWh * 8 hrs/day * 365 days/yr * .07/kWh = roughly $9 per year

- With the same 12,500 computers on campus, we could possibly reduce our electric consumption with regard to computing to roughly $190,000!

-By reducing our usage to only what we need, we can save almost 2/3 of our computing costs!!!

-Please do not forget about auxillary devices such as printers, scanners, speakers etc.  Each of theses devices can consume from 25-150 W/hour.

-  So if it’s not in use, turn it off.   If you would feel more comfortable leaving it on, then please use the following instructions to take advantage of your computer’s power saving features.

NOTE: By using our computers less we reduce the amount of extra heat in any given space.  When we reduce the heat we reduce the need to cool it down and saving energy with regard to air conditioning!

Power Management

As a general rule of thumb, you should turn off computer equipment if it is going to be idle for eight hours or more. For idle periods of less than eight hours, use Energy Saver software features to optimize and reduce energy use.

For Windows XP, 2000 operating systems
Follow these simple steps:

  • Click "Start" at the bottom left side of your screen.
  • Go to "Settings" and click on "Control Panel."
  • Open "Display" and click on "Screen Saver."
  • Select '(None)' within the Screen Saver selection listbox.
  • Within 'Monitor power' area, click "Power..." button.
  • Make sure that the "Power Schemes" tab is the current active tab window selected.
  • Select a time interval to 'Turn off monitor' (Suggested Time: 20 mins.)
    Select a time interval to 'Turn off hard disks' (Suggested Time: 20 mins.)
    * Choose a short duration to get your computer to sleep as soon as possible by powering down the hard drive and turning off the monitor.
  • Select a time interval to 'Turn off monitor' (Suggested Time: 20 mins.)
    Select a time interval to 'Turn off hard disks' (Suggested Time: 20 mins.)
    * Choose a short duration to get your computer to sleep as soon as possible by powering down the hard drive and turning off the monitor.
  • Select a time for 'System standby'.
  • Click "Apply" button, then click "OK" button.
  • That’s it!

    The overall objective of the program is to reclaim funds that we have had to divert to utility expenses and make them available to pay for other energy efficiency projects that will yield additional savings. Though Facilities has always championed cost-effective ways to reduce energy waste such as lighting retro-fits, replacement of inefficient infrastructure, etc, the current energy program is designed to solidify the savings with behavioral changes that are more sensitive to energy use. We want to change the culture regarding energy use and people’s attitude towards energy. In addition, the intent of the program is to reduce our utility expenses by making every university employee an active participant in the sensible control of our electric and gas utility consumption.

    We live in a society of over-consumption. By reducing our consumption only to what we need on a daily basis, we can reap the following benefits:

• Reduced emission of Green house gases like carbon dioxide

• Become an example of energy discipline and thus making our university more attractive to potential students and faculty

• Save money that can be diverted to better uses

• Improved life of equipment. By using them less lights, computers, printers, air conditioners etc. last longer

In this site you will find the DU campus energy policy, ways to save, student organizations dedicated to energy reduction and environmental awareness, DU energy facts, building by building usage information and more!