[Equest-users] mystery heating load

[Chris Hadlock]

Thanks to all who responded...the problem has now been solved. My faith in
eQuest remains.

Chris

On Thu, Dec 20, 2018 at 2:33 PM David Eldridge via Equest-users <
equest-users at lists.onebuilding.org> wrote:

> That last sentence is the issue – the system is providing some amount of
> air including return and OA to the space, without a heating coil, meanwhile
> the thermostat may be expecting 70F all of the time.
>
>
>
> The issue could be resolved by “upgrading” the unit to heat,
> removing/reducing the OA quantity, or by relaxing or removing the
> thermostat schedules depending on what your goals are for the project.
>
>
>
> David
>
>
>
>
>
> *David S. Eldridge, Jr.**, P**.**E**.**, LEED AP BD+C, BEMP, BEAP, HBDP*
>
> Associate
>
>
>
> Direct: (847) 316-9224 | Mobile: (773) 490-5038
>
>
>
> *Grumman/Butkus Associates* | 820 Davis Street, Suite 300 | Evanston, IL
> 60201
>
> Energy Efficiency Consultants and Sustainable Design Engineers
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>
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>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
> Behalf Of *Chris Hadlock via Equest-users
> *Sent:* Thursday, December 20, 2018 1:05 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] mystery heating load
>
>
>
> I've had a few responses requesting the modeling files so I've attached
> the INP and PD2 file (weather file is CWEC\Toronto.bin). The zone in
> question is "L0 Elev Lobby S" and I've already removed all exterior
> surfaces from this space (i.e. there are no Child Components). I've
> assigned this zone to it's own system (it's the last system on the air-side
> tab) called "Test System". I've already created the hourly reports where
> you'll see all of the underheated hours (which only occur in the winter).
> The LS-B report shows no (zero) htg load. I realize the system is not
> really providing any heating to this zone the way it's setup.
>
>
>
> Thanks,
>
> Chris
>
>
>
> On Thu, Dec 20, 2018 at 1:26 PM Chris Hadlock <cjhadlock at gmail.com> wrote:
>
> Hello,
>
>
>
> I've created a model using eQuest 3.65 (DOE 2.2) build 7173 that is of a
> 20 storey multi-residential building located in Toronto, Ontario (Canada).
> There is a basement with a elevator lobby that is an interior space (no
> exterior walls).
>
>
>
> My model keeps telling me I have underheated hours for this lobby. I'm
> trying to figure out why there is a heating load and I'm stumped. I have
> removed what I believe to be all potential sources of heat loss. I've
> deleted the underground floor (which was R-100 anyway), I've deleted the
> interior walls (just to be thorough), there is no infiltration, and I've
> set the ventilation to zero. In my mind, there is no source of heat loss.
> I've even added a significant (10 W/ft2) equipment load and yet there are
> still underheated hours (I've even reduced my Tstat setpoint to 60F).
>
>
>
> I've run an hourly report to help figure out the loads for both the space
> ("Sum of all weighted loads except infil and latent") and zone ("Load
> Calc'd SPACE Sensible load at const temp (Btu/hr)"). These reports all
> indicate a positive load (i.e. net heat gain) from my lights, plug loads
> and occupants. However through this process I'm also questioning these
> reports as the lighting, people and equipment load being reported don't
> exactly align with my modeled schedules for these loads....but I've put a
> pin in that.
>
>
>
> Regardless, I have no idea how to figure out what may be resulting in net
> heat loss for this zone. To be thorough, I checked the elevator lobby on
> the ground level and the same thing is happening. Has anybody seen this
> before...any ideas what might be causing heat loss for a zone with no
> ventilation and no walls and no infiltration? It does seem to be seasonal
> (i.e no underheated hours in the summer) so it has some connection to
> weather file but does not correlate exactly.
>
>
>
> If you do take the time to read this, a big thank you. If you provide the
> answer, you'll for sure be on Santa's "nice" list.
>
>
>
> Chris
>
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