[Equest-users] BDL expression dependency limit

[Bishop, Bill]

Hi Patrick,
Here are some ideas based on previous suggestions. (Caveat - I haven't had to address issues with the expression dependency limit before.)

-        Scott Criswell suggested "MaxExpDeps = 10" versus the default of 12. You could try experimenting with even lower numbers, until the problem goes away or you get a different problem from limiting the number of allowable references.

-        Scott's other suggestions were as follows:

o   BDL source code mods to increase the limit of exp dep lists

o   removal of some fraction of the expressions contained in your INP file, and/or

o   the addition of Set-Default statements in your INP file that replace additional BDL default expressions with static values or symbolic selections

-        I like the Set-Default statements idea. Add commands within your expressions for SET-DEFAULT FOR SPACE, SET-DEFAULT FOR SYSTEM, SET-DEFAULT FOR ZONE etc. to reduce the number of DOE-2 default dependencies. There are many DOE-2 default expressions that are pretty elaborate, which could be replaced with uniform default values or simpler expressions. See for example, the DOE-2 default expression for ZONE:THERMOSTAT-TYPE.

-        Using Input Macros in lieu of or in combination with keyword expressions may help. I am just starting to experiment with this BDL feature.
Regards,
Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer

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From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Lapierre, Patrick
Sent: Wednesday, March 16, 2016 9:25 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] BDL expression dependency limit

I've run up against the hard-coded limit of expression dependency in one of my projects.
Reading the archives, I've tried the 2 solutions I found to increase the capacity but I'm still short.

Those two solutions were :

-        Adding « MaxExpDeps = 10 » into the project PD2 definition;

-        Removing all « C- » keyword default expressions from the BDLDft.dat file (since they are only useful for Title-24 analysis);

I'm wondering if anyone had some other insight as to how I could further increase the expression dependency capacities.

Thanks,

  [Bouthillette Parizeau] <http://www.bpa.ca/>

Patrick Lapierre_ing.
plapierre at bpa.ca<mailto:plapierre at bpa.ca>   |  www.bpa.ca<http://www.bpa.ca>  |  t: 5143833747x2807

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