[BLDG-SIM] doe2 "Misc Equip" reporting errors?

Kate Turpin katet at pae-engineers.com
Mon Jul 10 10:32:58 PDT 2006

I jumped the gun on the second email on Friday, and just want to correct
the error...
The Electric Misc Equip discrepancy was also a result of the Process
Load that caused the problems on the Natural Gas.  
The take-away is that if you assign a process load to your HW
circulation loops, the energy will show up under the end use of "Misc
Equip" in your BEPS/BEPU reports - NOT under "Space Heating."   The
electric add to the "Misc Equip" category is from the EIR associated
with the process load (that is, if you set the EIR to zero, then there
is no change in electric energy use under "Misc Equip").  If you do not
have a process load assigned, the energy use related to the EIR on the
boilers is directed fully to "Space heating" end use category.


From: Kate Turpin 
Sent: Friday, July 07, 2006 2:47 PM
To: 'BLDG-SIM at gard.com'
Subject: RE: [BLDG-SIM] doe2 "Misc Equip" reporting errors?

for those interested - I figured out the sources of the discrepancies
Electric - Misc Equip discrepancy
Under the HW Boilers w/ Draft, there is an EIR that can be to model the
induced draft fans on the natural gas boiler.  When I set this EIR equal
to 0 in both the "Design" and "Budget" case models, the electric KWH
under "Misc Equip" in the BEPS/BEPU is the same.  I expected that the
boiler induced draft fan energy would be listed under the "Heating" end
use (or under "Fans" as a second choice)...  so Heads Up that it goes to
"Misc Equip"
Nat'l Gas - Misc Equip discrepancy
The natural gas Misc Equip "mystery" was my OOPS....  there was a
process load assigned to both models on the Secondary HW loop (I forgot
to look there - only checking the primary HW loop), and although both
the load and schedule were the same for the process load between models
(thus not showing up in my .inp file comparison), the different energy
end use probably resulted from hitting different parts of the boiler
part-load curve. 


From: Kate Turpin 
Sent: Friday, July 07, 2006 11:58 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] doe2 "Misc Equip" reporting errors?

I'm getting some strange output reporting in my doe2 SIM file under
energy end uses in BEPS and BEPU simulation file reports for the end use
"Misc Equipment."  It seems that some of my space heating and cooling
energy use is being directed to the "Misc Equip" end use category in the
simulation file....
Has anyone experienced something similar?  Anyone know why this might be
occurring and how to correct this?
more detail below.....
I'm using eQuest v3.55, and am doing an ASHRAE 90.1-1999 ECB method
energy study, so I have a "Design" case model of the building according
to construction documents, and have backed out a "Budget" case model
following the ECB guidelines in 90.1 (and associated HVAC system map
All Equipment plug loads assigned to spaces are assigned as electric
loads, and are identical between by "Design" case model and my "Budget"
case model.  No other internal energy sources are defined in either
model.  All schedules are identical between models.  No process loads
are assigned to any of my circulation loops or plant equipment.
The differences between input files are limited to:  lighting power
densities, construction types (walls, roof, glass, etc), and HVAC system
types are different due to following the ECB modeling methodology.
In my SIM file under "Misc Equip" in the BEPS/BEPU reports, I have very
different electrical KWH used under "Misc Equip", and Natural gas uses
have appeared in this same "Misc Equip" category, again with very
different total Therms used.... 
Does anyone know why the electric use under "Misc Equip" could be
different between the two models, and how natural gas use might have
appeared in the "Misc Equip" end use category
I tried reworking the input file a bit to make the "Design" and "Budget"
cases match in all of the HVAC equipment (i.e. including all HVAC
systems and thermal zones, and HVAC circ loops and plant equipment are
now identical).  So, for this run, the only differences between the two
input files are in Lighting loads, and Construction types.  
In this run, the BEPS/BEPU reports for the two models "Misc Equip" end
use category are still different between the two models for both
electric KWH used, and natural gas Therms, but the difference between
the models is much smaller than in "Case 1" above where the HVAC system
types were different.....   
Please let me know if you have any advice on how to correct this...

Thank you,

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