Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question
7

use autosizing values for next simulations

asked 2017-03-20 16:07:17 -0500

PJRosado's avatar

updated 2017-11-23 08:04:44 -0500

I am running a parametric analysis using prototypes that are autosizing most HVAC components. How can I run this prototype once, to obtain the values auto-calculated, and then fix those values for subsequent runs. I do not want each run to autosize the HVAC system, but to use only the autosized values from the 1st run.

edit retag flag offensive close merge delete

Comments

1

Just curious if anything may have changed in the last three years on the E+ side? The Eppy method is feasible, but not ideal, and this would be a really useful native feature of E+.

bbrannon4's avatar bbrannon4  ( 2020-12-09 22:40:35 -0500 )edit

2 Answers

Sort by ยป oldest newest most voted
4

answered 2017-03-20 18:05:29 -0500

@PJRosado Are you using EnergyPlus to run the simulations? If yes and if you know some Python, you could use eppy do so. I've done it in the past.

edit flag offensive delete link more

Comments

@Jeremy Thanks for your response! I am using jEPlus to run the parametric analysis. Also, I am writing a python code right now using eppy, but I'm struggling to extract the sized values from the .eio file and to match the field names from the .eio files to the actual field names in the .idf file. Any recommendations on how you did it with python? Thank you!!

PJRosado's avatar PJRosado  ( 2017-03-20 18:55:00 -0500 )edit

The script I used reads the output of the simulations via the HTML files using the eppy (here). If you are looking for some help with your code, it might be best to post a snippet.

Jeremy's avatar Jeremy  ( 2017-03-20 19:21:17 -0500 )edit
1

answered 2017-03-21 08:55:21 -0500

kpp's avatar

I did something similar some time back to fix the VAV size. I don't know if there is an easier way to do it. You can find the designed or sized outputs in .eio file that is generated after the first simulation. From this .eio file look for the right table for the right sized variable. Replace the autosize variable in .idf file with the designed value from the .eio file from the earlier simulation.

edit flag offensive delete link more

Your Answer

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

Add Answer

Training Workshops

Careers

Question Tools

1 follower

Stats

Asked: 2017-03-20 16:07:17 -0500

Seen: 538 times

Last updated: Nov 23 '17