Select **specific design days** before running sizing-period simulations

I’m trying to run some peak-heat gain studies on a concept-level massing. I have scripted out a workflow that uses only the sizing-period for the study, since I only need to evaluate the peak heat gain on the 0.4% Summer Design Day.

When I set the “for_sizing_period” to ‘True’ and “for_run_period” to ‘False’, on the HB Simulation Control Component, the workflow runs and gives me results for 31 different design days (with many 99.6% heating design days and many 0.4% cooling design days), although I would only want to run it just for the Annual peak Summer Design Day.

@chris , is there a way to pick and choose which design day I want to run the simulation for, and run it just for that day?

If not that, is there a way to parse the data tree results from the SQL file and isolate out the results just for the specific design day I want? However, this would be a bit counter-productive to run it for thirty more design days than what I want.

Would really use some help with this, thanks in advance :smiley:

Hi @harishv ,

The answer is yes. You just need to make your own DDY file with the single design day that you want to run. Then, you plug the path to this DDY file into the HB Sizing Parameter component. You can even use the Alternative Weather components in Dragonfly to help you make the DDY for you. Here is a sample that pulls out just one annual 0.4% cooling design day from the DDY and runs the simulation with that.

sample_with_custom_ddy.gh (60.4 KB)

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