[BLDG-SIM] Operating condition assumptions

[Tom Anderson]

Chip:

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.


     Thomas E. Anderson
     President
     Cx Associates, Ltd.
     Building Commissioning Specialists
     http://www.cx-assoc.com
     933 Road 101
     Jeffersonville, Vermont 05464 USA
     hvac at cx-assoc.com
     Tel: 802-644-5616 Fax: 802-644-6797

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 at wrightsoft.com
> 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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