[Equest-users] Trouble with thermal process loads in eQUEST

Dakota Kelley dakotak at teliospc.com
Tue Aug 24 07:05:27 PDT 2010


I think there’s a bug in v3.63b which restricts DDW Screen 21, at least for the gas side, to process loads.  eQUEST defines process loads as internal thermal loads which do not contribute to utility loads, hence your observation.  Look at the top of the Load column on Screen 21 and you’ll see a drop-down menu that is set to “Process Load”.  I say there’s a bug because at one point you could change this menu to “Gas” and it would be a thermal and utility load as you desire.  However, it now appears that Process Load is the only option.

 

The work-around is to go to the applicable zones in the Detailed Interface and change the load type from “process” to “gas”.  Refer to the attached screen shot.

 

Thanks,

 

 

  
                                

DAKOTA KELLEY 

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From: Adrian Gurga [mailto:gurga at illinois.edu] 
Sent: Monday, August 23, 2010 5:54 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Trouble with thermal process loads in eQUEST

 

Hello,

 

I'm trying to add a process load which consumes natural gas in eQUEST.  I'm doing it through the Design Development wizard.  I have enabled process loads by clicking the Process Loads box on page 15 (non-HVAC enduses to model) of the shell editor.  That enables page 21 (process loads and profiles).  In this, I can specify electric loads without a problem.  I just add in the watts per square foot and the electricity consumption goes up.  Perfect.  The trouble is the thermal loads, which are to the right of the electrical loads.  First I just tried entering 100 Btuh per square foot but left sensible fraction as zero.  Then I ran the model and there was no change.  Adding 100 Btuh per square foot has no effect on the natural gas consumption in the model.  If I try the same thing but increase the sensible fraction it will decrease the energy use in the model because it's assuming we get free heating from our process load, which is the opposite of what I want because it's assuming that process energy just magically appears in the building.  For some reason, adding a process load of X Btuh has no effect on the energy consumption.  How do I properly add this load?



-- 
Adrian Gurga
Smart Energy Design Assistance Center
University of Illinois - Urbana-Champaign
www.sedac.org <http://www.sedac.org/> 
(217) 244-4671
(800) 214-7954

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