I've done some digging and discovered that EnergyPlus conducts a series of preliminary checks, known as warm-up tests, prior to initiating the specified run-period simulation.

In these warm-up tests, the initial settings are configured with surface temperatures at 23°C and zone humidity ratios matched to the outdoor humidity ratio. The system then continuously repeats the environmental conditions of the first day until it either meets the convergence tolerance values for loads and temperature as outlined in the building object or it hits the pre-set maximum number of warm-up days, which defaults to a minimum of 6 days and a maximum of 25 days.

And you can report the simulation data during the warmup period using the **ReportDetailedWarmupConvergence** and **ReportDuringWarmup** in **Output:Diagnostics** object.

I've done some digging and discovered that EnergyPlus conducts a series of preliminary checks, known as warm-up tests, prior to initiating the specified run-period simulation.

In these warm-up tests, the initial settings are configured with surface temperatures at 23°C and zone humidity ratios matched to the outdoor humidity ratio. The system then continuously repeats the environmental conditions of the first day until it either meets the convergence tolerance values for loads and temperature as outlined in the building object or it hits the pre-set maximum number of warm-up days, which defaults to a minimum of 6 days and a maximum of 25 days.

And you can report the simulation data during the warmup period using the **ReportDetailedWarmupConvergence** and **ReportDuringWarmup** in **Output:Diagnostics** object.

I've done some digging and discovered I have found that EnergyPlus conducts a series of preliminary checks, known as warm-up tests, prior to initiating the specified run-period simulation.prforme some warmup test before