[BLDG-SIM] cannot meet ASHRAE 90.1 required hours

[Graham Carter & Megan Lyall]

Do you have night purge running or AHUs cycling on night setback? If  
so some (possibly all) systems reports include these hours in  
addition to the normal occupied hours you are really interested in.   
I always have to go back and refresh my memory on this stuff, but I  
know for sure the SS-R report reports these additional hours as under- 
cooled or under-heated where relevant.

If that doesn't explain things then there could be all kinds of other  
explanations such as cooling equipment scheduled as unavailable,  
supply temperature scheduled rather than demand reset etc.  Hourly  
reports of offending days showing what all the equipment and  
temperatures are doing will no doubt identify where you need to look ...

Regards,
Graham
On 14/08/2007, at 5:09 AM, yizhao1 at vt.edu wrote:

> Hi all-
> I'm runing a simulation with eQuest for a baseline required by  
> ASHRAE 90.1.
> system type 7, VAV w/reheat iis used. I've increased the heating  
> and cooling
> capacity of VAVs significanlty, but the umet hours are still exceed  
> the
> requirements, and do not change much as I change the heating and  
> cooling
> capacity of the VAV system.
> Do you know what the problem is? Any susgestion would be helpful!
>
> Thanks in advance!
>
> Ying Zhao
>
>
>
>
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