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DesignDay in EP+ is necessary if without HVAC

asked 3 years ago

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137 ●2 ●5

updated 3 years ago

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4446 ●5 ●17 http://bleedinggreenna...

Hello everyone

I have a question about the design day in EP+/OpenStudio. I understand for now that the DesignDay is for the general HVAC sizing. If I firstly model a whole building with all passive building systems (without any motorized or mechanical elements), could I run this building simulation without DDY file? Is there any negative impact on this workflow? My intention is to separate the passive building/systems simulation from active features in buildings.

Thanks in advance

Wei

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answered 3 years ago

flag of United States of America

12570 ●220 ●9 https://www.nrel.gov/b...

That is correct. You do not need Design Days to be defined in your model if you have either:

No HVAC system to be autosized in your model,
A hardsized (i.e., user-entered sizing values rather than autosized) HVAC system in your model, or
An autosized HVAC system using an alternative sizing method (e.g., using SizingPeriod:WeatherFileDays).

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Thanks Scott for your reply

wei_zhang ( 3 years ago )

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Last updated: Feb 19 '22

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