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Foe short, if any objects in your model have aurosize value, you need to perfoem sizing calculation.
The sizing calculations are used to determine the 'authorize' values in some of the objects. For zone sizing, it determines the macimum supply air flow rate based on the design day conditions. For system sizing, it gets the DX coil maximum capacitits and so on. For plant sizing, it finds the chiller and boiler capacities.

Foe short, if any objects in your model have aurosize value, you need to perfoem sizing calculation.
The sizing calculations are used to determine the 'authorize' values in some of the objects. For zone sizing, it determines the macimum supply air flow rate based on the design day conditions. For system sizing, it gets the DX coil maximum capacitits and so on. For plant sizing, it finds the chiller and boiler capacities.

Foe short, if any objects The "Ideal Zonal System" and "Ideal Loads Sizing Simulations" are the same thing. They only work in your model have aurosize value, you need to perfoem zone sizing calculation.
period. The results from the zone sizing calculations are period will be used to determine the 'authorize' values sizes of HVAC systems in some of the objects. For zone sizing, it determines the macimum supply air flow rate based on the design day conditions. For system sizing, it gets the DX coil maximum capacitits and so on. For plant sizing, it finds the chiller and boiler capacities. sizing.

There The "run simulation for sizing periods" is similar to "Run Simulation for Weather file run periods". The "Run simulation for sizing periods" use the "SizingPeriod:" objects as the weather data, while the "Run Simulation for Weather file run periods" use "RunPeriod:" objects as the weather data. Both results are lots of objects with autosize capabilities.outputs to the *.csv and other output files.