Determining appropriate heat gain from office desktop computers, printers, etc. has always been a gray area for HVAC designers. Coming up with real world information such as equipment nameplate power rating vs. actual wattage consumed and suitable diversity factors have been a challenge for load calculations.
However, an excellent article titled "Heat Gain from Office Equipment" by Wilkins and Hosni published in the June 2000 ASHRAE Journal addressed this issue. Bottom line: about .5 to 1.0 watts per square foot. Useful information and tables comparing nameplate data vs. measured power vs. overall office diversity.
Article is available at ASHRAE site in .pdf form. It is one of
the more useful publications to emerge from the ASHRAE research program,
in my opinion.
Chip Barnaby wrote:
Greetings --Does anyone have good source(s) for typical operating condition assumptions
for various building occupancies?We're assembling a library that includes setpoints, lighting power density,
occupant density, plug loads, etc plus associated schedules. The data will
be used for load (sizing) calcs, so we're looking for representative design
values. However, info for energy calcs would also be helpful.Thanks for any leads.
---------------------------------------------------------
Chip Barnaby cbarnaby@xxxxxxxxxxxxxx
Vice President of Research
Wrightsoft Corp. 781-862-8719 x118 voice
394 Lowell St, Suite 12 781-861-2058 fax
Lexington, MA 02420 www.wrightsoft.com
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