[Equest-users] mystery heating load

Joe Huang yjhuang at whiteboxtechnologies.com
Thu Dec 20 12:59:55 PST 2018

And the cause for the mystery load is ??  Don't just leave us hanging!


On 12/20/2018 12:47 PM, Chris Hadlock via Equest-users wrote:
> 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 
> <mailto: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
>     _grummanbutkus.com <http://grummanbutkus.com/>_| _Blog
>     <http://grummanbutkus.com/blog>_ | _Facebook
>     <https://www.facebook.com/pages/GrummanButkus-Associates/1385285015032526>_
>     | _Twitter <https://twitter.com/grummanbutkus>_
>     *From:*Equest-users
>     [mailto:equest-users-bounces at lists.onebuilding.org
>     <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
>     <mailto: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
>     <mailto: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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