EMS: how to initialize parameters for an equation with many variables - Unmet Hours

Question-and-Answer Resource for the Building Energy Modeling Community

Get started with the Help page

0

EMS: how to initialize parameters for an equation with many variables

asked May 21

Leticia
13 ●2

updated May 21

flag of United States of America

14355 ●90 ●25 http://bigladdersoftware.com/

I'm using EMS to set a logistic regression equation, but I'm having the following error message: "Error: EvaluateExpression: Variable = 'C50' used in expression has not been initialized!"

This error appears when I add variables to my equation. With only two variables (intercept plus one more) the simulation runs correctly. Ex: when my equation is: 'set handle=A35+B47Top' it runs ok when my equation is: 'set handle=A35+B47Top+C50*RH' I receive the above error message

My input objects for 'EnergyManagementSystem:Program' are: image description

For 'EnergyManagementSystem:ProgramCallingManager' they are: image description

Thank you for any help!

Comments

Can you link to your IDF via e.g. Google Drive or Dropbox?

shorowit ( May 22 )

Sure. The idf (version 9.6) and weather file are here: link text

Leticia ( May 22 )

1 Answer

Sort by » oldest newest most voted

1

answered May 22

Jamie Sullivan
276 ●10 ●5

Looking at your model, I believe the issue is that you don't have C50 in your global variables, so its value can't be passed between programs (the same with D61 etc.).

Comments

Oh yes, the mistake was really simple, thank you! I think I went through it so much that I forgot a simple detail. Thanks a lot.

Leticia ( May 26 )

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Training Workshops

Careers

Question Tools

2 followers

Stats

Asked: May 21

Seen: 209 times

Last updated: May 22 '24

Site design and logo: Copyright © 2015 Big Ladder Software LLC. All rights reserved.
The Unmet Hours and Big Ladder names and logos are trademarks of Big Ladder Software LLC.
User contributions licensed under the Creative Commons Attribution Share Alike 3.0 License.

Powered by