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NREL / OCHRE

A Python-based building energy modeling (BEM) tool designed to model flexible loads in residential buildings
https://www.nrel.gov/grid/ochre.html
BSD 3-Clause "New" or "Revised" License
44 stars 7 forks source link

Same simulation keeps giving different results #136

Closed phaniarvind closed 3 months ago

phaniarvind commented 3 months ago

I am facing an issue with running the same building multiple times. I'm unable to figure out if it is an issue with the way I defined my building or with the input files or with my computer. Any help would be greatly appreciated. Apologies in advance if there is a trivial mistake somewhere.

Attached is a zip folder that contains a script that will define a building by generating arguments for it and simulate the exact same building ten times. At the end the metrics for each are collected and printed. The problem is that the metrics are all different.

BaselineTest.zip

mnblonsky commented 3 months ago

Hi @phaniarvind, all you need to do is set the seed in the dwelling_args:

dwelling_args = {
    ...
    "seed": 1,
}

This will reset the random number generator, which impacts a few things like initial starting temperatures and EV charging events. Normally the seed is set based on the output_path, but since you don't specify one then it doesn't get set.

I think our documentation of this is wrong, sorry about that. We'll try to get it fixed soon.

phaniarvind commented 3 months ago

Ah gotcha! I was wondering if there's any random number selection involved but I didn't think of this in particular. Sorry about that. Thanks a lot for your time and patience! It works now.