[Bldg-sim] Ashrae 90.1 - Unmet hours

Crockett, Jim Jcrockett at nexant.com
Mon Oct 26 14:27:02 PDT 2009


Ashrae 90.1 (2004) Appendix G3.1.2.2 requires a baseline building to
have less than 300 unmet hours.  What exactly does this mean?

 

To illustrate my question:  assume you have a building with 301 zones,
and each zone has 1 unmet hour per year.  This gives you a total of 301
unmet hours, and requires you to increase your baseline equipment
capacity.  But you could argue that, on average, the building has only 1
unmet hour per year.

 

Have any of you run into this?  Is it addressed in an addendum
somewhere, etc?

 

Any help is appreciated.  Thanks,

 

 

 

Jim Crockett, P.E.

 

Senior Project Engineer

Energy & Carbon Management

Nexant, Inc.

4021 S. 700 E., Suite 250

Salt Lake City, Utah 84107

 

(801) 639-5603 - phone

(801) 266-4786 - fax

 

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