If you want to maintain a 1:1 ratio of occupants to computers, then the occupancy schedule and computer room schedule should be the same. When you define the occupant and equipment objects in the model, you set a peak usage value and reference a schedule that is just multiplied with that peak usage value. This can be defined as either a total value ($occupants, W, etc.$) or as a per-floor-area value ($occupants/ft^2, W/ft^2, etc.$). Using either method, you should set the peak computer electricity use equal to the power draw of one computer [$W / person$] multiplied by the peak occupant use.
Let's say that the computer room is 1,000 $ft^2$, has 20 seats, and each computer uses 100 $W$. When you define the occupant object, the peak total occupant count is 20 $people$. When you define the equipment object for the computers, the peak electricity use is 2,000 $W$ (20 $people$ * 100 $W/person$).
If you are defining the peak occupancy with a per-floor-area value, which is most common, then the occupant density is 20 $people$ / 1,000 $ft^2$ = 0.02 $people / ft^2$, and the equipment power density is 2,000 $W$ / 1,000 $ft^2$ = 2 $W / ft^2$. This would be the same as taking 0.02 $people / ft^2$ * 100 $W / person$ = 2 $W / ft^2$.
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Asked: 2017-10-26 09:30:59 -0500
Seen: 132 times
Last updated: Oct 26 '17
