The Modelica Buildings Library 14.0.0, 13.0.1, 12.1.2 and 11.1.2 were released on October 05, 2026.

The Modelica Buildings Library 14.0.0 is a major release. Versions 13.0.1, 12.1.2 and 11.1.2 are maintenance releases, and are backward compatible with 13.0.0, 12.1.1 and 11.1.1, respectively.

All three versions contain various model improvements and versions 14.0.0 also includes new models.

The following major changes have been done for the Modelica Buildings Library 14.0.0

The following major changes have been done compared to release 13.0.0:

• The packages Buildings.Applications.DataCenters.LiquidCooled and Buildings.Fluid.DataCenters have been added with system and component models for liquid-cooled data centers, such as CDUs and racks.
• An autosizing feature has been added to the package Buildings.ThermalZones.EnergyPlus_24_2_0, where, during initialization, the EnergyPlus sizing routine can be invoked, resulting in parameter values being passed to Modelica thermal zone and HVAC system objects. These parameter values include heating and cooling loads, zone set points, outdoor conditions, and minimum outside air flow all at design conditions, and can be used throughout the Modelica model to size HVAC equipment based on the EnergyPlus sizing results.
• The air-to-water heat pump plant template in Buildings.Templates.Plants.HeatPumps has been extended to support 4-pipe polyvalent heat pumps that can simultaneously provide heating and cooling. Associated control subsequences have been added to Buildings.Templates.Plants.Controls.
• The package Buildings.Fluid.Geothermal.Borefields.TOUGH has been added with models and a user guide for coupled simulation between Modelica and the TOUGH simulator that calculates the ground response.
• New functions for pressure drop calculations with flow exponents between 1 and 2 have been added to Buildings.Fluid.BaseClasses.FlowModels, enabling modeling of partially turbulent flows such as in microchannel heat exchangers. The model Buildings.Fluid.FixedResistances.PressureDrop and several heat exchangers in Buildings.Fluid.HeatExchangers have been updated to expose these parameters.

Also, many models have been updated to improve performance, to improve compliance with the Modelica Language Standard and to correct model errors.

For a detailed list of changes, see https://simulationresearch.lbl.gov/modelica/releases/v14.0.0/help/Buildings_UsersGuide_ReleaseNotes.html

The library has been tested with Dymola 2026x, OpenModelica 1.26.3, OPTIMICA 1.66 and recent versions of Impact.

More information and download

For more information and download of the Modelica Buildings Library, visit https://simulationresearch.lbl.gov/modelica/.