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

J R john.reed.other at gmail.com
Thu Dec 12 08:23:30 PST 2013


Hi David,
Thanks for the quick response.  I reset my global parameter to numeric, and
entered the input expression as you specified, but I'm now getting the
following error message:
"Expression Parsing Error: Invalid function name 'SYSTEM' 5"

Any thoughts?

Thanks,

John


On Wed, Dec 11, 2013 at 2:29 PM, David Griffin <dgriffin at etcgrp.com> wrote:

>  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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>
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>
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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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