diff --git a/IDEAS/UsersGuide/Acknowledgements.mo b/IDEAS/UsersGuide/Acknowledgements.mo
index b665a145b9..cd41ab367a 100644
--- a/IDEAS/UsersGuide/Acknowledgements.mo
+++ b/IDEAS/UsersGuide/Acknowledgements.mo
@@ -31,18 +31,28 @@ The European Commission (2024-2028), through the PhD scholarship of Anna Dell'Is
The European Commission (2024-2028), through the PhD scholarship of Louis Hermans, the research grant of Lone Meertens, and the Horizon Europe 'SEEDS' project (no. 101138211)
+The Agency for Innovation by Science and Technology in Flanders (VLAIO), through the research grant of Klaas De Jonge (HBC.2023.0488)
+
+
KU Leuven (2021-2025), through the PhD scholarship of Lucas Verleyen, the research grant of Javier Arroyo, and the 'TECHPED' project (C24M/021/21)
-Research Foundation Flanders (FWO) (2020-2024), through the PhD scholarship of Jelger Jansen
+Research Foundation Flanders (FWO) (2020-2024), through the PhD scholarship of Jelger Jansen (1SC9721N|1SC9723N)
KU Leuven (2019-2021), through the research grant of Filip Jorissen, and the C3 project (C32/18/063)
+Research Foundation Flanders (FWO) (2019-2023), through the PhD scholarship of Klaas De Jonge (1SA7619N)
+
+
The European Commission (2016-2021), through the research grant of Filip Jorissen and Damien Picard, and the Horizon 2020 'MPC-:GT - hybridGEOTABS' project (no. 723649)
+The European Commisson, the European Regional Development Fund (ERDF), Flanders Innovation and Entrepreneurship, and the Province of Limburg (2015-2018), through the research grant of Glenn Reynders
+and the 'EFRO-SALK GeoWatt' project
+
+
The Agency for Innovation by Science and Technology in Flanders (IWT-VLAIO) (2014-2018), through the research grant of Arnout Aertgeerts, and the 'Living Lab De Schipjes’ project
@@ -55,11 +65,13 @@ The European Commission (2012-2015), through the PhD scholarship of Roel De Coni
The Agency for Innovation by Science and Technology in Flanders (IWT) and WTCB (2011-2016), through the IWT-VIS 'Smart Geotherm' project
+VITO (Flemish Institute for Technological Developments) (2011-2015), through the PhD scholarship of Glenn Reynders
+
+
3E (2010-2014), through co-funding the PhD scholarship of Roel De Coninck
The KU Leuven Energy Institute (2010-2014), through the PhD scholarships of Ruben Baetens, Roel De Coninck, Juan van Roy and Bart Verbruggen, and the ‘Optimal Energy Networks in Buildings' project
-
-To be completed...
+IDEAS v4.0.0 has been released on August 20, 2025.
+
Highlights
+
+
+A new IDEAS logo has been developed and added to the README and Modelica package.
+
+
+The IDEAS.Buildings.Data package has been revised,
+and a new library of building envelope constructions with different insulation levels has been added.
+This package allows the selection of building constructions (Constructions, Frames, Glazing, Insulation, Materials)
+based on their classification in the EPC framework.
+
+
+Significant improvements to the IDEAS.Examples.Tutorial.DetailedHouse tutorial.
+
+
+A two-port interzonal airflow model has been developed, allowing to model the stack effect in buildings.
+
+
+The DHW tap model has been significantly improved (IDEAS.Fluid.Taps).
+
+
+A dynamic Photovoltaic-Thermal (PVT) model has been added (IDEAS.Fluid.PVT),
+including an extensive documentation and validation.
+
+
+
+
Detailed release notes
+
+
+
+Merged latest version of IBPSA library has been merged (commit b6cff3bfe523804f88615c885326b244ba2d923a).
+
+
+Added a dynamic Photovoltaic-Thermal (PVT) collector model (IDEAS.Fluid.PVT),
+including an extensive documentation and validation.
+
+
+Revised and corrected the embedded pipe model.
+
+
+Added a redesigned IDEAS logo to the README and Modelica package.
+
+
+Updated the wind speed modifier calculation according to ASHRAE2005 and changed the
+default local terrain type to Unshielded in
+IDEAS.BoundaryConditions.Interfaces.PartialSimInfoManager.
+
+
+Cleaned up and extended the IDEAS User's Guide.
+
+
+Updated some models of IDEAS.Buildings.Components to avoid scripting errors in OpenModelica.
+
+
+Updated IDEAS.Examples.IBPSA.SingleZoneResidentialHydronicHeatPump to fix the compatibility with OpenModelica.
+
+
+Corrected errors in IDEAS.Buildings.Data.Constructions.FloorOnGround.
+Due to this change, the locGain parameter of conTypFlo
+in IDEAS.Examples.IBPSA.SingleZoneResidentialHydronicHeatPump had to be redeclared.
+
+
+Added OuterWall as a possible construction type for a floor.
+
+
+Cleaned up the repository by removing unused scripts, files, and images,
+and replacing equation images with inline equations.
+
+
+Improved the graphical representation of IDEAS.Examples.DetailedResidentialNoHeating
+in the Diagram view of Dymola.
+
+
+Added missing m_flow connections in IDEAS.Buildings.Components.Shading.Box.
+
+
+Updated the existing IDEAS building constructions (IDEAS.Buildings.Data.Constructions)
+and added new building envelope data packages (Constructions, Frames, Glazing, Insulation, Materials).
+This package allows the selection of building constructions based on their classification in the EPC framework.
+
+
+Removed import \"package\" statements from some models and explicitly replaced it by Modelica.package,
+e.g. Modelica.Units.SI.
+
+
+Updated models to avoid translation warnings when using IDEAS.Buildings.Components.Examples.CavityInternalWall.
+
+
+Moved the existing tutorial to IDEAS.Examples.Tutorial.DetailedHouse
+and thoroughly revised its content.
+
+
+Corrected ventilation mass flow rate calculation and updated nominal pressure drop
+in IDEAS.Templates.Ventilation.ConstantAirFlowRecup.
+
+
+Updated Medium package implementation in IDEAS.Buildings.Components.Interfaces.PartialZone
+to avoid errors with IDEAS.Buildings.Components.RectangularZoneTemplate.
+
+
+Changed unit of parameter dT_nominal to Modelica.Units.SI.TemperatureDifference
+in IDEAS.Fluid.Actuators.Valves.Simplified.Thermostatic3WayValve.
+
+
+Updated calculation of transmission design losses in the IDEAS.Buildings.Components models
+to allow custom indoor design temperatures.
+
+
+Removed invalid Shading for IDEAS.Buildings.Components.Shading.Interfaces.ShadingType.
+
+
+Replaced non-linear limiter block in screen models (IDEAS.Buildings.Components.Shading)
+by a proper control signal implementation and assert.
+
+
+Updated scripts and BuildingsPy for merging IBPSA into IDEAS.
+
+
+Updated view factor asserts in
+IDEAS.Buildings.Components.BaseClasses.RadiativeHeatTransfer.ZoneLwDistribution
+to guard against non-physical geometries.
+
+
+Added T_start_ground parameter to the model.
+
+
+Revised the DHW tap model (IDEAS.Fluid.Taps).
+
+
+Fixed wrong construction type and zone height for IDEAS.Examples.PPD12.Structure.
+
+
+Removed duplicate parameter declarations in IDEAS.Buildings.Components.Interfaces.PartialZone
+and IDEAS.Fluid.Actuators.Valves.Simplified.ThreeWayValveMotor.
+
+
+Fixed bug in IDEAS.Templates.Heating.BaseClasses.HysteresisHeating.
+
+
+Updated the CI runner used for unit tests.
+
+
+Created a BOPTEST branch which is up-to-date with the master branch except for the expandable connectors (see change below)
+as OpenModelica does not yet support expandable connectors.
+
+
+Change IDEAS.Buildings.Components.Interfaces connectors to expandable
+to avoid errors in Wolfram System Modeler and to improve compatibility with the Modelica language specification.
+
+
+Added a file containing the Belpex spot price for 2021.
+
+
+Added a weather file containing data measured at the Vliet building (Heverlee, Belgium) in 2021.
+
+
+Added a two-port interzonal airflow implementation to model stack-effect.
+On top of this, an assert was added to do a first check of the floor heights as provided by the user.
+
+
+Added cavity support for ceilings and floors.
+
+
+Modelled air layer between screen and window that heats up.
+
+
+Updated several models to be compatible with OpenModelica.
+
+
+Updated U-value of window frames (IDEAS.Buildings.Data.Frames) and added references.
+
+
+Updated material properties (IDEAS.Buildings.Data) and added references.
+
+
+Fixed illegal connections for Modelon Impact in
+IDEAS.Examples.TwinHouses.BaseClasses.Structures.TwinhouseN2.
+
This Modelica package is free software and the use is completely at your own risk.
For license information, view our License.
diff --git a/README.md b/README.md
index 1337f9bc98..f15c5e93e0 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
-v3.0.0
+v4.0.0
@@ -85,7 +85,7 @@ year = {2018}
```
## Release history
-IDEAS v3.0.0 was released on May 3, 2022. This release includes an update to the Modelica Standard Library MSL 4.0.0.
+IDEAS v4.0.0 was released on August 20, 2025.
Detailed release notes are available within the library under the following link:
[ReleaseNotes](https://github.com/open-ideas/IDEAS/tree/master/IDEAS/UsersGuide/ReleaseNotes).
Notes for the previous releases notes can also be found there.
-v3.0.0
+v4.0.0