[Equest-users] Unmet hours in residential building

[Michael Campbell]

Julien,

Regarding the infiltration method... I am currently trying to do this with
a small bathroom with 50cfm exhaust.  This is a core zone.  Adjusting the
design day values as described in the write-up does not appear to be doing
anything.  Any thoughts?

Thanks,
Mike

On Thu, Oct 15, 2015 at 11:45 AM, Julien Marrec <julien.marrec at gmail.com>
wrote:

> Michael,
>
> First, you're under 300 hours so indeed it's a minor problem.
>
> I've only looked at your model very briefly but:
>
>    - HW loop operation is set to "SNAP" at OA of 60°F. This is causing
>    some minor underheating in shoulder season.
>
>
>    - You have local exhaust fan with makeup = infiltration. Basically
>    equest ignores this added infiltration during the sizing, so you have to
>    trick it to take it into account by having a different schedule for sizing
>    (heating AND cooling design days). I've put together my findings on the
>    subject on Unmet Hours here
>    <https://unmethours.com/question/3102/how-do-you-model-exhaust-fans-in-equest/>
>    in some kind of tutorial that I hope is helpful.
>
>
> Do the above and your unmet hours disappear.
>
>
> Additionally:
>
>    - Throttle range of 0.3°R seems pretty aggressive to me.
>    - when you use baseboards and want to oversize, use the system's
>    sizing ratio
>
>
> Hope this helps,
> Julien
>
>
> --
> Julien Marrec, EBCP, BPI MFBA
> Energy&Sustainability Engineer
> T: +33 6 95 14 42 13
>
> LinkedIn (en) : www.linkedin.com/in/julienmarrec
> LinkedIn (fr) : www.linkedin.com/in/julienmarrec/fr
> <http://www.linkedin.com/in/julienmarrec>
>
> 2015-10-15 16:30 GMT+02:00 Michael Campbell <mcamp1206 at gmail.com>:
>
>> I mistakenly attached the PRD file instead of PD2.  Correct files are
>> attached.
>>
>> On Thu, Oct 15, 2015 at 10:16 AM, Michael Campbell <mcamp1206 at gmail.com>
>> wrote:
>>
>>> Hello,
>>>
>>> I'm having what appears to be a minor issue with unmet hours in a model
>>> that I've inherited.  My INP and PD2 files are attached.  I've tried
>>> adjusting the cool sizing ratio and and adjusted infiltration rates and
>>> equipment loads with no real effects.  Anybody have any ideas?
>>>
>>> Thanks,
>>> Mike Campbell
>>>
>>
>>
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