+--------------------------------------------------------+ | OpenStudio Application (GUI) | +--------------------------------------------------------+ | v +--------------------------------------------------------+ | OpenStudio SDK / Core | +--------------------------------------------------------+ | v +--------------------------------------------------------+ | EnergyPlus Simulation Engine | +--------------------------------------------------------+

Even as newer versions of OpenStudio (3.x and beyond) have been released, 2.9.1 remains relevant for several reasons:

Execute the installer. It is highly recommended to keep the default installation directory (e.g., C:\openstudio-2.9.1 on Windows) to avoid breaking path references used by third-party wrappers like Parametric Analysis Tool (PAT) or Rhino/Grasshopper components. Step 3: Configure Environment Variables

: Instead of manually changing every window's U-value, a Measure can loop through the entire building envelope and apply changes in seconds. Large-Scale Analysis : By combining seed models with Measures via the OpenStudio Server