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Can I do geometric parametric study with just IDF file and JEPlus?

asked 2022-08-13 10:55:34 -0500

Prakash R R's avatar

updated 2022-08-14 21:10:43 -0500

I am working with design builder software and generated an IDF file for parametric study via JEplus. It is a simple rectangular footprint that I want to scale and check the energy dynamics. Any direct or indirect ways can also be fine.

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answered 2022-08-16 17:09:40 -0500

Yi Zhang's avatar

Hi Prakash, sorry for picking this up late.

Although it is possible to manipulate geometry using jEPlus parameters, it is tedious even with a simple box shape. There are several options you can consider, though. First, if you have only a small number of shapes and sizes to investigate, you can create all those geometries using DesignBuilder/OpenStudio/ladybug tools, and then include those IDF files as a parameter. You can see this example for how to include IDF segments: Second, if you have a simple box, it may be possible to use EP-Macro (or the new Python plug-in I suppose) to calculate the coordinates of all surfaces. You can see it here ( for reference. The third option would be to write your own Python code to generate those coordinates. This can be done by either writing all surface objects of the IDF or modifying surfaces with Eppy, according to parameters in jEPlus, eg. scaling factors. You can call the Python script for preprocessing:

Hope these will give you some ideas.



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Much thanks! I got it and will proceed as guided.

Prakash R R's avatar Prakash R R  ( 2022-08-16 21:22:48 -0500 )edit

answered 2022-08-15 04:44:53 -0500

Jim Dirkes's avatar

jEplus is very flexible for running parametrics. Review their documentation to learn the details. ps, You can do this within jEplus, I think, but we use an Excel spreadsheet which has the parameters defined, then upload it to jEplus.

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Thanks. Ya, I checked through the documentation, and I did not find one specific to geometric parametric analysis. Can you support finding the exact source to refer to, If possible?

Prakash R R's avatar Prakash R R  ( 2022-08-15 07:38:38 -0500 )edit

Sorry, I can't do this until I've finished up several projects that need immediate attention. How about emailing Dr Yi Zhang at jEplus for some guidance?

Jim Dirkes's avatar Jim Dirkes  ( 2022-08-15 19:06:49 -0500 )edit

Thanks, and hoping for a few more answers from the experts before emailing Dr. Yi Zhang.

Prakash R R's avatar Prakash R R  ( 2022-08-15 21:23:22 -0500 )edit

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Asked: 2022-08-13 10:55:34 -0500

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Last updated: Aug 16 '22