[BLDG-SIM] cannot meet ASHRAE 90.1 required hours

[Michael Tillou]

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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