[Equest-users] mystery heating load

[Joe Huang]

This might be true in the real world, but not in eQUEST (nor any other 
simulation program that I know) because it would require CFD modeling of 
the spaces.

Joe


On 12/20/2018 11:44 AM, Bruce Easterbrook via Equest-users wrote:
> Hi Chris,
> I'm thinking it could be due to infiltration.  You have a 22 story 
> elevator shaft that probably has a machine room on the roof.  You also 
> have stack effect.  Any exterior air from the machine room getting in 
> from this drive is going to be cold and move down to the bottom of the 
> shaft and pool there.  That would be the basement.  It would also 
> affect levels above this explaining your load in on the first floor.  
> It should decline as you get higher in the building.
> Bruce Easterbrook P.Eng.
> Abode Engineering
>
> On 12/20/2018 2:05 PM, Chris Hadlock via Equest-users wrote:
>> 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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