[Equest-users] Changing words with global parameters / parametric runs?

[David Griffin]

John,

Try using an expression like the following which uses a 'numeric' global parameter rather than a 'symbol'.

if(#PA("Enthalpy Wheel On/Off ")=1)
then
#SI("YES","SYSTEM","RECOVER-EXHAUST")
else
#SI("NO","SYSTEM","RECOVER-EXHAUST")
endif

This expression is a work around to some issues I've found in eQuest using 'symbol' global parameters. Just set the global parameter to 1 and change it to anything else in the parametric run to change the value or vice versa. Let me know how it goes.

Thanks,

David W. Griffin II
Energy Analyst
ETC Group, LLC
801-278-1927 x 128
Cell 480-736-2945
dgriffin at etcgrp.com
www.etcgrp.com

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Energy Engineering for a Sustainable Future
1997 South 1100 East, Salt Lake City, UT 84106-4471
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From: J R [mailto:john.reed.other at gmail.com]
Sent: Wednesday, December 11, 2013 10:07 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Changing words with global parameters / parametric runs?

Hi Everybody,
First off, as a relatively new eQUEST user, the past discussions in the archives has been immensely helpful in troubleshooting issues, so thanks to everybody for responding to questions from eQUEST rookies like myself.  Now, for the new questions:

I've developed a model in detailed mode that I would like to make some parametric runs for to run alternative scenarios. For numeric inputs, I haven't run into any issues, but I'm wondering if there's a way to change words using global parameters too. Specifically, I'd like to add an enthalpy wheel in the parametric run by adjusting the yes/no option under my AHU's heat recovery 1 tab: "ERV device installed" Yes/No dropdown. These are the steps I've taken.


  *   Create new global parameter: "Enthalpy Wheel On/Off"

     *   Parameter type: "New Symbol"
     *   Parameter value: "No"

  *   Right click device Installed dropdown: User Input Expression - I tried two different expressions:

     *   #SI(#PA("Enthalpy Wheel On/Off"),"SYSTEM","RECOVER-EXHAUST")

        *   Error Message: Expression Evaluation Error: BDL Symbol 'No' not found

     *   #parameter("Enthalpy Wheel On/Off")

        *   Invalid symbol assignment (symbol table index = 0)

  *   If the above error were solved, my next step would be to create a parametric run, component type: symbolic global parameter, and change the value to "yes".
I have no doubt that I'm using the wrong language for what I'm trying to accomplish, but don't know what other approach to take.  Any advice would be greatly appreciated.

Also, on a more general note, does anybody have a good resource they could share that is more or less an eQUEST detailed mode guide? I've found the intro, wizard, and DOE2 guides on the eQUEST site, but it seems like there is a lot of functionality with the program in detailed mode that isn't really explained anywhere.

Thanks in advance for your help!

John
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