[Equest-users] ERV Impact

[Robby Oylear]

Examine your ERV-TEMP-CTRL setpoint.  If it's set to float you can end up
overshooting your mixed air temperature setpoint and having to recool the
air.

Also, ERV-RUN-CTRL should be set to WHEN-MIN-OA or one of the
OA-EXHAUST-DT/DH options for maximum energy savings.

That being said, eQUEST's ERV algoirthm has never given me good results.
I've had a lot of trouble showing savings and have experienced similar
issues as you describe.

Check your hourly reports for the system.  There are a number of parameters
related to ERV's that you can monitor and check to see if its working as
intended.

[image: Inline image 2]



On Fri, Nov 30, 2012 at 11:59 AM, Andrew Clagett <AndrewC at hargis.biz> wrote:

> Hello all. After finalizing my building and obtaining what appeared to be
> reasonable output, I removed the ERV devices (modeled at 85% efficient
> cross-flow air to air heat exchangers) from the model to ascertain the
> energy savings attributable to those devices.****
>
> ** **
>
> And my total energy consumption went *DOWN* over 6%! Inexplicably, ‘space
> cooling’ and ‘pumps & aux.’ energy consumption has decreased by a  far
> larger amount than ‘space heating’ increased. I would have expected both of
> those values to increase along with the ‘space heating’ energy consumption
> (which did increase).****
>
> ** **
>
> Anyone have any idea why that might be?****
>
> ** **
>
> *Andrew Clagett, *PE, LEED AP ****
>
> Mechanical ****
>
> d |  206.436.0494     o | 206.448.3376    e | andrewc at hargis.biz    v-card<http://www.hargis.biz/vcards/Andrew%20Clagett.vcf>
> ****
>
>  ****
>
> *HARGIS** *****
>
>      mechanical • electrical • telecommunications • security     ****
>
> ** **
>
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