EnergyPlus does not recognize Zone Sizing is Initialized

[Ski90Moo]

Issue overview

This may be and EnergyPlus issue...

When the model is run, the following error appears in the eplusout.err file: Severe ManageSizing: Requested System Sizing but did not request Zone Sizing. HEP-24-03 CALCS_002.txt

~~~ System Sizing cannot be done without Zone Sizing Fatal Program terminates for preceding conditions.

Current Behavior

OpenStudio does request Zone sizing:

OS:SimulationControl, {3761ef35-bae8-4829-aabb-a11ecfac8e0e}, !- Handle Yes, !- Do Zone Sizing Calculation Yes, !- Do System Sizing Calculation Yes, !- Do Plant Sizing Calculation Yes, !- Run Simulation for Sizing Periods Yes, !- Run Simulation for Weather File Run Periods , !- Loads Convergence Tolerance Value {W} , !- Temperature Convergence Tolerance Value {deltaC} , !- Solar Distribution , !- Maximum Number of Warmup Days , !- Minimum Number of Warmup Days Yes; !- Do HVAC Sizing Simulation for Sizing Periods

The in.idf file also does Request Zone sizing:

SimulationControl, Yes, !- Do Zone Sizing Calculation Yes, !- Do System Sizing Calculation Yes, !- Do Plant Sizing Calculation Yes, !- Run Simulation for Sizing Periods Yes, !- Run Simulation for Weather File Run Periods Yes, !- Do HVAC Sizing Simulation for Sizing Periods ; !- Maximum Number of HVAC Sizing Simulation Passes

Expected Behavior

Steps to Reproduce

OSM file is attached. Click run.

1. 2. 3. 4.

Possible Solution

Details

Environment

Some additional details about your environment for this issue (if relevant):

• Platform (Operating system, version):

• Version of OpenStudioApplication (if using an intermediate build, include SHA):

Context

[macumber]

I looked at your model @Ski90Moo, I think your current problem is that you need to add diffusers to your zones in the air loop tab

After I added those to your model I got past the first issue and on to some issues with your geometry. Hope that helps

[Ski90Moo]

Thank you @macumber. I have encountered this issue before, but I think I confused the diagnosis when I posted this issue. It appears that the default when creating a new OS model is that Do Zone Sizing Calculation and Do System Sizing Calculation is toggled off. Why is that? Without input from the users, I think by default these should be toggled on. For example, when I import spaces, create thermal zones and thermostats, and add an autosized Packaged Rooftop Air Conditioner and assign zones to the diffusers, these two remain toggled off. It then gives this error and the user has to diagnose the problem.