Forum discussion
CS-2009 EAp2: Minimum Energy Performance
Should a computer be calculated as 400W or according to Energy star in our case 175 KWh/annual or around 80 W?: ref: http://www.energystar.gov/index.cfm?c=revisions.computer_spec
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Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
963 thumbs up
August 19, 2010 - 8:05 am
I assume you are asking what computer load should be included in your energy model.
Typically, models use an average power density for each room, with a time of day schedule applied. For office space you might use 1.0 to 1.5 w/sf receptacle load, with a schedule that keeps the load in the 75-100% range during working hours, but reduces to 10-20% during unoccupied hours.
If you are trying to estimate the power consumption of a single computer, keep in mind that computers typically draw much less that their rated (nameplate) power draw. The nameplate power is the worst case - it is what the wire needs to be sized for. But for estimating energy consumption or heat gain, significant load diversity should be taken. The Energy Star information you linked to is a good place to start. Even better - get yourself a "kill -a-watt" meter, and measure it yourself. http://amzn.to/bDqa2e