[Equest-users] baseboards activating when zone is already above heat setpoint?

Thu Aug 27 10:38:30 PDT 2020

I suggest removing the baseboard schedule. It is supposed to be used only
when baseboard output is controlled based on outdoor temperature,
independent of zone temperature. So leave the baseboard schedule as
"undefined" and set the zone control to "thermostatic". Does that work?

-Erik

*Erik Kolderup, PE, LEED AP*
erik at kolderupconsulting.com | 415.531.5198 | www.kolderupconsulting.com

On Thu, Aug 27, 2020 at 10:34 AM Nicholas Caton via Equest-users <
equest-users at lists.onebuilding.org> wrote:

> Hi Matthew!
>
>
>
> A couple thoughts:
>
>    - Baseboard operations can be specified at both ZONE and SYSTEM
>    levels.  I’m not entirely sure (intuition alone) which takes precedent if
>    you have both.  You may want to review what is entered at the SYSTEM level
>    under the heating tabs… that could explain the delivery of heat at a time
>    when the zonal temp conditions do not warrant the baseboard’s operation.
>    - Regardless, applying a schedule to the baseboards (and/or baseboard
>    loop, if you have that set up as a distinct loop in the hydronic tab) can
>    probably override this behavior by making the baseboards only available
>    when seasonally appropriate (by calendar) and/or by utilizing an OADB snap
>    temperature threshold to limit baseboard heating availability.
>    - An error popping up in application of a schedule is possibly what
>    it’s saying on the tin: the schedule may simply an incompatible type (the
>    only valid option for BASEBOARD-SCH is RESET-RATIO)… but sometimes the
>    eQuest interface is just behaving badly.  If you’re uncertain the schedule
>    (annual/week/day schedules inclusive) are of an appropriate/compatible
>    type, then I’d advise starting from scratch by first loading in a
>    compatible library schedule, and adjusting from there.  If you are
>    confident the schedule is of the correct type, then I might try “forcing”
>    this assignment by saving a separate copy of your project, closing eQuest,
>    adding the appropriate assignment to 1 zone via the INP file in a text
>    editor of your choosing, then opening that modified project to see if it
>    “sticks.”  If so, then you may likely be able to proceed with assigning
>    that schedule to the remaining zones as appropriate.
>    - Might be worth noting, if you want to control baseboard heating
>    availability at the circulation loop level, you’ll have a couple few more
>    viable options in terms of schedule type.
>
>
>
> I hope this is helpful!
>
>
>
> ~Nick
>
>
>
>
>
>
>
> *Nick Caton, P.E., BEMP*
>
>   Senior Energy Engineer
>
>   Energy and Sustainability Services
>   Energy Performance Contracting
>
> D
> M
> E
>
>
> 913 . 564 . 6361
>
> 785 . 410 . 3317
>
> *nicholas.caton at se.com <nicholas.caton at se.com>*
>
> 15200 Santa Fe Trail Drive
> Suite 204
> Lenexa, KS 66219
>
>
>
>
>
> *From:* Equest-users <equest-users-bounces at lists.onebuilding.org> *On
> Behalf Of *Matthew Yarmon via Equest-users
> *Sent:* Thursday, August 27, 2020 12:16 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] baseboards activating when zone is already
> above heat setpoint?
>
>
>
> [External email: Use caution with links and attachments]
> ------------------------------
>
>
>
> Hi all,
>
>
>
> I hope you're able to see the image below. If not, I uploaded it here:
> https://imgur.com/a/WpQ8FSR
> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fimgur.com%2Fa%2FWpQ8FSR&data=02%7C01%7CNicholas.Caton%40se.com%7C2b594d4a489b47c421ec08d84aacf77c%7C6e51e1adc54b4b39b5980ffe9ae68fef%7C0%7C0%7C637341454029975820&sdata=39WSmtUZhlhfTyFbUM2P1r2Pz4rqleOpnXIL8QeRxaQ%3D&reserved=0>
>  It shows eQuest 'hourly results', specifically it shows a warm day in the
> year, July 3rd, for a model I'm looking at.
>
>
>
> In my model, from 1pm-4pm on July 3rd, the heating setpoint is 71 °F (grey
> column), cooling setpoint is 76 °F (blue).  Outdoor temp is ~84 °F
> (orange), zone temps are ~75-77 °F.  The question is, why are my baseboards
> (yellow column) activating and heating the zone?  The temp in the zone is
> above the heating setpoint, so the baseboards should not be turning on.
>
>
>
> The baseboards are set to 'thermostatic' control.  I've been unable to
> set  baseboard schedule (see 2nd screenshot below - if anyone has a
> suggestion for this problem, I'd love to hear it).  But regardless of the
> schedule, if the zone heat setpoint is 71 °F, and zone temp is above 74 °F,
> why are baseboards turning on?
>
>
>
> Cheers,
>
> Matthew
>
>
>
>
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