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
The process load can be treated as a direct load in meter. This type load
will not effect the building energy consumption "inside".
But you need to get the total process load first.
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
Many thanks. This resolves the issue. Alternatively if you'd like to avoid
the detailed interface, on that page 21 drop down menu which you mentioned,
the default setting is Natural Gas, with the option to change it to Process
Load. However, once you change it to Process Load, you can't change it back
to Natural Gas. It wasn't too much trouble to rebuild the model with all
the correct inputs and make a point not to change that drop down this time.
Now it works like a charm.
--
Adrian Gurga