Openstudio 2.9.1 -

OpenStudio 2.9.1 is a specific release of the OpenStudio SDK

1. Introduction

3.2. HVAC & Sizing

• Fixed bug where the Sizing:Plant object would not correctly update loop exit temperature setpoints when using the Python API.
• Resolved error where autosizing of AirLoopHVAC:UnitarySystem with multispeed fans could produce incorrect airflow values.
• Corrected translation of Coil:Heating:Water to EnergyPlus IDF format when the coil is used in a dedicated outdoor air system (DOAS).

• EnergyPlus 9.2 Integration: This was a major jump from previous versions, bringing significant speed improvements and updated HVAC templates to the simulation engine.
• Updated Standards: The OpenStudio Standards Gem (which auto-generates constructions and loads based on building codes like ASHRAE 90.1) was updated to support newer code cycles.
• Geometry Editor Improvements: Enhanced integration with the FloorSpace.js tool for creating building geometry via floor plans.
• Measure Writing: Improvements to the measure testing framework and the OpenStudio CLI (Command Line Interface).

The release of OpenStudio 2.9.1 brought several refinements to the ecosystem. One of the most critical aspects of any OpenStudio version is its compatibility with the underlying EnergyPlus engine. Version 2.9.1 is paired with EnergyPlus 9.2.0. This alignment ensures that users have access to the physics-based calculations and thermal zones management introduced in that specific engine update. openstudio 2.9.1

Benefits and Applications

Given the release of newer versions (OpenStudio 3.x series with Radiance integration and OpenStudio-Standards improvements), 2.9.1 is now considered a legacy but still functional version. It is best suited for users maintaining models created in the 2.9.x ecosystem or requiring strict compatibility with EnergyPlus 9.3.0. OpenStudio 2

Version Pinning: Always ensure your EnergyPlus version matches the version supported by OpenStudio 2.9.1 (9.2.0) to avoid simulation errors. Fixed bug where the Sizing:Plant object would not