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#181746 - 10/28/08 12:54 PM Service size for spec office space  
cgw  Offline
Member
Joined: Jul 2004
Posts: 133
Rochester NY
I'm trying to estimate a service size for a samll office building. My estimate works out to 10W/SF. Previous projects are all around 10W/SF. It is for a 14,800 square foot building for which I have preliminary floor plans for a small part of it (two tenents). 12 W/SF sound right? There is an elevator which I will add on top (of the 12W/SF) along with other house loads like exterior lighting.


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#181748 - 10/28/08 03:14 PM Re: Service size for spec office space [Re: cgw]  
wa2ise  Offline
Member
Joined: Nov 2002
Posts: 784
Oradell NJ USA
I imagine that much of that load will be computers and such with really bad power factors and drawing current with lots of harmonics. Which means you'd need individual neutrals or superneutrals to handle it.


#181749 - 10/28/08 04:08 PM Re: Service size for spec office space [Re: wa2ise]  
ghost307  Offline
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Joined: May 2005
Posts: 917
Chicago Illinois USA
Make sure that the HVAC loads aren't coming out of your 12 W/SF. They can eat up a lot of power quickly.


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#181752 - 10/28/08 09:11 PM Re: Service size for spec office space [Re: ghost307]  
cgw  Offline
Member
Joined: Jul 2004
Posts: 133
Rochester NY
The HVAC is included.
By NEC lighting is 3.5W/SF and receptacles 1W/SF (off the top of my head). In practice receptacle loads are higher (at least 2W/SF). Lighting will be less than 2W/SF but (as far as I can tell) we need to use the 3.5.
Electric for HVAC is fairly predictable.



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