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[EnergyPlus_Support] Geometry vs Simplification - General Advice and Thoughts Please

I have created a model of a stadium that is geometrically complex to reflect the zone volumes under the curved and slanted podium roof. I was under the assumption that an accurate volume is an essential to accurately model the building energy usage.

However, the complexities made it impossible (DesignBuilder could not export an idf this big and e+ crashed on very large idfs, not to mention that it took days to simulate just 1 level after I had split them up) to model the whole building at once and forced me to model one floor level at a time.

This was the main reason that I decided to model using the ideal air method. Trying to apply ASHRAE 90.1 Appx G has been difficalt as with the ideal air method, individual componants such as fans are not explicitly modelled.

Has anybody tried to do an ASHRAE 90.1 code conform simulation using the ideal air flow method? How far can one deviate using "exceptional calculation"? Pretty much the intire simulation is at the moment an "exceptional calculation".

I could simplify the geometric model, but I fear the resulting zone volume deviation will be significant. 


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