[Bldg-sim] eQUEST - percent of hours outside throttling range

[Graham Carter & Megan Lyall]

If my memory serves me correctly the hours associated with night  
purge and optimal start are included in the hours loads not met.  As  
one would expect during these operational conditions, the space  
temperatures would often be out of range.  200-300 is not  
unreasonable in my experience.
G

On 15/05/2008, at 2:12 AM, Ramana Koti wrote:

> Dear all,
>
> I'm working on the energy model for a school building with 43 zones  
> with each zone connected to a ground source heat pump. Right now  
> the model is for design development but eventually the same model  
> could be used for LEED.
>
> I can't seem to get the percent of hours any system zone outside of  
> throttling range below 48%. The system sizing ratio of all airside  
> systems is currently at 2. As per HVAC design, the depth of ground  
> source loop is 400 ft and I tried increasing it to 600 ft and that  
> only helps a little.
>
> In the SS-R report, the undercooled hours for different zones are  
> in the 200+ range while the underheated hours are in the range of  
> 200 to 500. I'm using the Dodge City, KS weather file.
>
> Also the current annual energy consumption is as low as 18.1 kBtu/ 
> ft2, I know that will change as the % hours outside the throttling  
> range changes but still seems very low.
>
> Thanks for your help,
>
> RAMANA KOTI Assoc. ASHRAE LEED® AP
> Sustainable Building Analyst
>
> ELEMENTS division of BNIM architects
> 106 West 14th Street Suite 200
> Kansas City Missouri 64105
>
> d 816.783.1635 f 816.783.1501
> bnim.com | elements.bnim.com
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