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Dear all,

I'm modelling a project with two buildings totaling 378000 m2 of GFA. The total zones are 1288 and total building surfaces are 3496.

After exporting the geometry from Design Builder, I did a trial run with IdealLoadAirSystem, which took around one hour.

After further adding HVAC systems (mainly VAV and PAU+FCU), the simulation time could take up to 22hrs, which is abnormally long. There are exhaustive severe error messages for zones like below:

CheckWarmupConvergence: Loads Initialization, Zone="XXXXX" did not converge after 25 warmup days.

Can anyone kindly suggest the possible reasons for the errors and long simulation time?

Thanks,

Rocky

Dear all,

I'm modelling a project with two buildings totaling 378000 m2 of GFA. The total zones are 1288 and total building surfaces are 3496.

After exporting the geometry from Design Builder, I did a trial run with IdealLoadAirSystem, which took around one hour.

After further adding HVAC systems (mainly VAV and PAU+FCU), the simulation time could take up to 22hrs, which is abnormally long. There are exhaustive severe error messages for zones like below:

CheckWarmupConvergence: Loads Initialization, Zone="XXXXX" did not converge after 25 warmup days.

Can anyone kindly suggest the possible reasons for the errors and long simulation time?

Thanks,

Rocky