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Comparaison of run time for HVAC system, single duct VS dual duct

I made a basic OpenStudio model with SketchUp.

The objective is to compare the run time for an HVAC system; simple duct VS dual duct.

The result shows that run time of the model with dual duct is about six time longer than a model with simple duct.

What can explain this result?

Comparaison of run time for HVAC system, single duct VS dual duct

I made a basic OpenStudio model with SketchUp.

The objective is to compare the run time for an HVAC system; simple duct VS dual duct.

The result shows that run time of the model with dual duct is about six time longer than a model with simple duct.

What can explain this result?

Comparaison of run time for HVAC system, single duct VS dual duct

I made a basic OpenStudio model with SketchUp.

The objective is to compare the run time for an HVAC system; simple duct VS dual duct.

The result shows that run time of the model with dual duct is about six time longer than a model with simple duct.

What can explain this result?