[Equest-users] Appendix G Baseline Systems 1 and 2 efficiency

[Jeremy Poling]

That was the only problem in my mind - I figured a try and see approach
would get to the bottom of it.  Scott is probably much more familiar
with this than I am, but there are no problems referencing local
keywords under the same parent from what I have seen.  You can setup a
function that defines the WIDTH keyword of a window as a function of the
HEIGHT keyword of the same window without a problem.  The issue I was
worried about (and you are as well) would be using a local keyword as a
reference when that keyword is determined by the program and not
explicitly defined in the input file.  

 

It would probably take me at least a few hours of playing around with it
to figure out if I can even reference the COOLING-CAPACITY keyword under
the COOLING-EIR.  

 

Jeremy R. Poling, PE, LEED AP+BDC
 

 

From: Bishop, Bill [mailto:wbishop at pathfinder-ea.com] 
Sent: Wednesday, May 18, 2011 8:52 AM
To: Jeremy Poling; Dahlstrom, Aaron; equest-users at lists.onebuilding.org
Cc: Scott Criswell
Subject: RE: [Equest-users] Appendix G Baseline Systems 1 and 2
efficiency

 

Jeremy,

Can a child component (COOLING-EIR) reference the keyword value of
another child component (COOLING-CAPACITY) of the same parent?

In the case I'm describing, there is no keyword value for
COOLING-CAPACITY, since it is calculated by the program, not entered. Is
there any way to reference program output with a user input function?

Thanks,

Bill

 

From: Jeremy Poling [mailto:Jeremy.Poling at transwestern.net] 
Sent: Tuesday, May 17, 2011 11:52 PM
To: Dahlstrom, Aaron; Bishop, Bill; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Appendix G Baseline Systems 1 and 2
efficiency

 

Have you thought about using a "user input function" to define the EIR?
I haven't used one this way yet, but there are a few examples out there
in the help info.  In theory, you could setup a logic statement that
checks the capacity and uses the EIR value appropriate for that size
system.  I'd be willing to discuss the idea with you guys, but there'll
be a certain amount of "if at first you don't succeed..." involved to
figure out the right code to grab the system capacity.

 

I've been playing more with user input functions after seeing some
examples of powerful ways they can remove some of the repetitive
changes.  For example, for single-zone systems, you could theoretically
program eQuest to auto-calculate the OA based on ASHRAE 62.1
requirements and the zone area and population.  You could probably do it
for multi-zone systems also, but that gets into the complexity level of
the ASHRAE 62.1 spreadsheet and it is probably less time to just do the
calcs in the spreadsheet and input the results.

 

Jeremy R. Poling, PE, LEED AP+BDC

 

________________________________

From: equest-users-bounces at lists.onebuilding.org on behalf of Dahlstrom,
Aaron
Sent: Tue 5/17/2011 10:31 PM
To: Bishop, Bill; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Appendix G Baseline Systems 1 and 2
efficiency

Bill:

 

Your procedure sounds very similar to ours.

 

Beyond the simple automation of a spreadsheet, and dual monitors to copy
data from SIM to XLS quickly, we haven't found any quicker ways to skin
this cat.

 

Aaron Dahlstrom , PE, LEED(r) AP

In Posse - A subsidiary of AKF| 1500 Walnut Street, Suite 1414,
Philadelphia, PA 19102 

d: 215-282-6753| m: 267-507-5470| In Posse: 215-282-6800| AKF:
215-735-7290

e: ADahlstrom at in-posse.com | in posse web: www.in-posse.com
<http://www.in-posse.com/>  | akf web: www.akfgroup.com
<http://www.akfgroup.com/> 

 

 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bishop,
Bill
Sent: Tuesday, May 17, 2011 3:43 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Appendix G Baseline Systems 1 and 2 efficiency

 

Appendix G Baseline Systems 1 (PTAC) and 2 (PTHP) have cooling
efficiencies (and for PTHP, heating efficiencies) that vary with cooling
capacity per Table 6.8.1D. Since each thermal block is modeled with its
own system, you can end up modeling as many as 100 or more systems per
project. For LEED projects (or other App. G models), I have been
calculating and manually entering values for cooling EIR for every
single system, based on capacities reported in the SV-A reports. I
factor in the unique fan power (per G3.1.2.9) for each system and remove
its contribution from the efficiency, since fan power is included in EER
and needs to be separated per G3.1.2.1. Once you enter efficiency for
each system, just about any change you make in the model changes the
supply flow rate and/or system capacities, which means you need to redo
all the efficiency calculations.

 

Does this method seem correct?

Has anyone figured out a way to automate this process? (And by
"automate", I don't mean give it to the intern.)

 

Thanks,

Bill

 

 

 


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