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Weather file issues

asked 2018-09-12 13:10:57 -0500

Ranjani gravatar image

updated 2018-09-17 11:22:33 -0500

Hello everyone,

I am trying to do sizing runs using Open Studio 2.5. I exported the project file from CBECC-Com and manually autosized the model. The weather file chosen is San Francisco (SFO). When the software is running the calculations, it uses SFO weather file for sizing but uses another weather file for calculating Detailed daylighting factors. Can I know why is it choosing another file other than the one chosen? Will, that impact the sizing? How can I change it?


I am also trying to compare the HVAC sizing between 2 glass types and I see no difference in the HVAC system capacities, (especially plant side components) between the glass types. I did check the calculations under simulation settings

C:\fakepath\Sim control.JPG

Still, I see no difference. I have attached the OS models.


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@Ranjani could you post a link to your model?

Avi gravatar imageAvi ( 2018-09-13 01:02:36 -0500 )edit

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answered 2018-09-13 03:28:21 -0500

Two weather-related things need to be loaded, and they should match: the weather file and the design days. Seems like you have just the Los Angeles EPW, while you have the San Francisco DDY.

Import the San Francisco EPW using the "Set Weather File Button", then import the Design Days (for sizing purposes) using the "Import from DDY" (and perhaps only keep a subset of these).


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Asked: 2018-09-12 13:10:57 -0500

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Last updated: Sep 13