[Bldg-sim] Supply air temp reset - ASHRAE 90.1 - Appr G

[Stirling Walkes]

I would interpret that as by zone demand, since you will have both internal and external gains figured in to the "minimum cooling load conditions".  There could be instances where the outdoor air temperature is relatively low, but your solar load in conjunction with the internal heat gains may be high, so a straight outdoor air reset wouldn't work.
 
My thoughts.
 
Stirling

>>> Julia Beabout <juliabeabout at yahoo.com> 4/5/2008 4:55 PM >>>
All,
RE: ASHRAE 90.1, App G, Article G.4.2.3.1.2, Supply Air Reset
 
Addendum A revised this article to say: "The air temperature for cooling shall be rest higher by 5F under the minimum cooling load conditions".
This sounds to me like they are saying the supply air temperature should be reset based on outdoor air temperature.  This would be quite a change in concept from the original version of this article which required the supply air temperature to be reset based zone demand.
 
Are others out there interpretting the revised addendum A version of this article the same way I am....i.e. that the SAT should now be reset based on outdoor air temperature?  Or, are people still interpretting it as the SAT should be reset based on zone demand?
 
Would appreciate any feedback anyone has on this, especially with respect to doing a LEED energy model.
Thanks.
Julia
 
 
 
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