[Equest-users] Confirmation for finding the Baseline Energy Model Supply Airfllow

[Carol Gardner]

Kathryn,

I think that .5 cfm/sf is too low. I never saw it used when I was designing
HVAC systems except for an occasionally used interior space. I immediately
change it to1.0 cfm/sf which I feel is a good place to start. For highly
loaded rooms with lots of internal gain I sometimes up that amount after I
have checked the other possible inputs.

Carol

On Tue, Sep 7, 2010 at 1:55 PM, Kathryn Kerns <
kathryn.kerns at bceengineers.com> wrote:

>
>
> Everyone,
>
>
>
> We are having a discussion at the office about how to define the supply
> airflow and energy model baseline. I pick the baseline system type per
> Appendix G (packaged single zone, packaged VAV, etc., set the heating sizing
> ratio to 1.25 and the cooling sizing ratio to 1.15, leave the heating and
> cooling capacities blank so the model will auto-size, and then set the
> default airflow to 0.5 cfm/sqft and let eQuest run. I then check to see if
> the baseline energy model unmet hours are less than 300 and are within 50
> hours of the proposed model. If the baseline energy model is above 300 unmet
> hours or isn’t within 50 hours of the proposed model, I will then start
> tweaking the airflow in the baseline energy model thermal blocks that are
> causing the unmet hour issues to solve the problem.
>
>
>
> Is this what everyone else is doing or do leave the airflow with the
> default values it calculated with the 0,5 cfm/sqft limit and enter capacity
> values in the previously blank HVAC cooling and heating capacities slots so
> the baseline energy model stops auto-sizing?
>
>
>
> Thanks.
>
>
>
>
>
> *Kathryn Kerns*
>
> *Systems Specialist*
>
> *BCE** Engineers, Inc.*
>
> *| Ph: 253.922.0446 | Fx: 253.922.0896 |*
>
>
>
>
>
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-- 
Carol Gardner PE
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