[BLDG-SIM] cannot meet ASHRAE 90.1 required hours

[Vikram Sami]

Another area to check is night time setback. If for example you setback
too far and have to throttle back in the morning without cycling on
early enough that could be a problem. Also - make sure your fan schedule
matches your heating/cooling schedule - if you ramp up at 6:00 am, but
the fans don't come on till 8:00 am, the loads will be unmet in those 2
hours. Also, if you have multiple zones attached to the same system, and
your control zone is significantly smaller than the other ones, you
might have unmet loads.


Vikram Sami, LEED AP
Direct Phone 404-253-1466 | Direct Fax 404-253-1366

LORD, AECK & SARGENT ARCHITECTURE
1201 Peachtree Street NE, Suite 300, Atlanta, GA 30361
Responsive Design * Technological Expertise * Exceptional Service
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-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Michael
Tillou
Sent: Wednesday, August 15, 2007 1:01 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] cannot meet ASHRAE 90.1 required hours

 

I suggest you look at your peak building loads for the zones that cannot
be met and look for anything unusual.

One thing to look for is loads from underground surfaces on zones where
they don't belong.  

I have run across a problem where a model was built in the wizard with
underground floors mistakenly included on every shell rather than just
the ground floor.  eQuest, for whatever reason, does not handle this
well and has trouble satsifying the zone loads regardless of the system
capacity.  

MMT

Michael Tillou, PE, LEED
P: 413-458-9870 C: 413-652-1087




  

-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Graham
Carter & Megan Lyall
Sent: Tuesday, August 14, 2007 4:18 PM
To: BLDG-SIM at gard.com
Cc: BLDG-SIM at gard.com
Subject: [BLDG-SIM] cannot meet ASHRAE 90.1 required hours

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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