Question-and-Answer Resource for the Building Energy Modeling Community
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You mention you have two buildings. Split it into two different models.
378000 m2 is enormous, and if built they would be the 5th and 6th largest buildings in the world if the two buildings are of equal size. Energyplus just isn't going to be fast if it has to run convergence on HVAC systems across 1288 zones and 3496 surfaces. Ideal loads is faster because it doesn't have to resolve the operation of the plant equipment; it meets the zone loads exactly.
