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# How to simulate for 365 days, currently it is only doing simulation for 18 days (at intervals of 20 days)?

Here is the Runperiod Data present in my IDF File, Energyplus v9.1.0

RunPeriod,
WholeYearDay,            !- Name
1,                       !- Begin Month
1,                       !- Begin Day of Month
,                        !- Begin Year
12,                      !- End Month
31,                      !- End Day of Month
,                        !- End Year
Tuesday,                 !- Day of Week for Start Day
Yes,                     !- Use Weather File Holidays and Special Days
Yes,                     !- Use Weather File Daylight Saving Period
No,                      !- Apply Weekend Holiday Rule
Yes,                     !- Use Weather File Rain Indicators
Yes,                     !- Use Weather File Snow Indicators
;                        !- Treat Weather as Actual


Edit: Simulation Control Object settings.

SimulationControl,
Yes,                     !- Do Zone Sizing Calculation
Yes,                     !- Do System Sizing Calculation
Yes,                     !- Do Plant Sizing Calculation
No,                      !- Run Simulation for Sizing Periods
Yes;                     !- Run Simulation for Weather File Run Periods

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It sounds like you are indeed running an annual simulation (365 days) but are confused by the fact that EnergyPlus displays the progress of its simulation in 20 day increments (by default). This is because the ShadowCalculation's Calculation Frequency has a default value of 20 days.

Note the progress output refers to the shadow calculations:

Updating Shadowing Calculations, Start Date=05/21/2007
Continuing Simulation at 05/21/2007 for RUN PERIOD 1
Continuing Simulation at 06/10/2007 for RUN PERIOD 1


If you changed this input to 1 day, you would get 365 output progress messages that are 1 day apart during the simulation -- however this will increase runtime (and affect simulation results).

I've never understood why EnergyPlus's runtime output progress is linked to this shadow calculation frequency. It seems like it could easily offer an input that governs the output progress that is independent of the shadow calculation frequency. But anyway, that's how it is.

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Make sure the SimulationControl object has the field Run Simulation for Weather File Run Periods enabled, eg:

SimulationControl,
Yes,                      !- Do Zone Sizing Calculation
Yes,                      !- Do System Sizing Calculation
Yes,                      !- Do Plant Sizing Calculation
No,                       !- Run Simulation for Sizing Periods
Yes;                      !- Run Simulation for Weather File Run Periods

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Please check the edit, what you suggested was already present, but still i am not able to run the simulation for 365 days.

( 2019-12-23 23:26:38 -0500 )edit