[BLDG-SIM] Loads not met interpretation in ASHRAE 90.1-2004

[Rohini Brahme]

I usually look through the zone report (SS-H? - the one which shows the undercooled or underheated hours for each zone) to see if any zone has unreasonably high numbers. Fixing these zones usually gets me a very low number for unmet hours for the total of all zones. I would be curious to see what others have to suggest. In your case, going through 76 zones would be quite tedious.
- Rohini
 
All:
 
ASHRAE 90.1-2004 has design criteria for Equipment capacities on Page 176 of the Standard (G3.1.2.2). It talks about Unmet load hours on the proposed design AND the baseline design not exceeding 300 hrs (of 8,760 Hrs), and the delta between base and proposed not differing more than 50 hours.
 
Is this WHOLE BUILDING, or BY ZONE? I have 76 zones in my building, and to play the Unmet loads game between these two models is harder than trying to hold water in my hands.
 
Any thoughts, interpretations, or suggestions?
 
John R. Aulbach, PE, CEM
Project Manager
Nexant, Inc.
100 North Barranca, Suite 820
West Covina, CA 91791 USA
Phone: 626-430-9054
Fax: 626-430-9060
email: jaulbach at nexant.com
 
 
 


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