Release Notes
Welcome to the official Release Notes of the Hysopt product portfolio. This page gives you a concise overview of all updates to the Hysopt product portfolio.
If an update is only applicable to a specific Hysopt product, the update is marked with the corresponding product label (e.g. Simulator-only, Calculator-only ).
All other updates are general software improvements available to all users.
For the Hysopt BIM Syncer, updates marked with 🔄️ require an update of the revit plug-in. This newest revit plug-in can be downloaded here.
Changes Mar 4, 2026
Launching the Building Simulation Quickstart (BSQ) wizard
Introduced the new Building Simulation Quickstart (BSQ) wizard to significantly accelerate model setup.
Enables automatic generation of common header configurations.
Optimised for enabling fast processing of importing building simulation data in Hysopt.
More information can be found at Building Simulation Quickstart
Introducing the template replacement functionality (Ctrl+P)
Auto-insert templates in your system using the new template replacement functionality (Ctrl+P)
The functionality automatically inserts energy centre templates at the location of placeholder BCs
Relevant control connections are made automatically, reducing the need for manual template setup
More information can be found at Template Configuration window (Ctrl+P)
Added energy centre placeholder BCs for early-stage simulations
Added new energy centre placeholder base circuits (BCs).
Intended for use in early project phases when the final production setup is not yet defined.
Placeholder BCs can be easily replaced with actual energy centre concepts using the template replacement functionality.
Enhanced the inspiration library user interactions
Improved user interactions within the Inspiration Library.
Upgraded the filtering interation with instant response
Improved the ‘preview’ option by opening previewed models in new browser tabs
New Base Circuits (BCs)
Non-return valves
Added non-return valve in supply and non-return valve in return under ‘distribution circuits’
Providing these as individual BCs increase modelling flexibility
Added a manual control switch to the control library Simulator-only
Beta Release
Beta features provide early access to functionality that is still under active development. They allow users to explore upcoming capabilities and provide feedback that helps shape future feature releases. Beta features are optional and can be enabled individually via the User Preferences. They are disabled by default to ensure a stable and predictable modelling experience. Note that functionality offered as beta may change or be removed in future releases.
Beta-released features can be found under this section, complemented with the tag beta release.
New Beta release: Solver improvements for faster simulation beta release Simulator-only
Introduced solver performance improvements as a beta feature.
The solver improvements are most noticeable for large simulations
Changes Feb 18, 2026
New Thercon HP Booster (DSW200WQ) now available in catalogue Calculator-only
Added the new DSW200WQ HP Booster to the component catalogue.
The component is available in the Thercon sanistage Base Circuit for DHW applications.
More technical details on this component are available on the website of Thercon.
Improved usability of DHW buffer vessel parameter list
The design heat flow and regime parameters are now bare input parameters for better usability
The update ensures consistent behaviour with the input view option.
Updated freezing point error on pipes Simulator-only
The freezing point error on pipes is now only applicable when using Coolflow DTX.
Changes Feb 4, 2026
Full-year simulations now retain hourly data of all variables Simulator-only
Graph data of all variables are now available after a year simulation
The update allows for more convenient and deeper analysis posibilities of long simulations
The software has been improved fundamentally, increasing simulation performance of complex models
Upgraded the PDF export with a high-resolution option (max DPI)
The PDF export DPI setting now has an option “Max
The max option will automatically provide the user with a high-resolution PDF export
The update allows to download clear Hysopt schematics to share with co-workers.
Enhanced the legend formatting of pipe heatmap exports
The legend of a pipe heatmap export is now properly adapted per page size
Improved the user experience of the PDF export dialogue
The user experience of the PDF export is improved by pre-filtering valid DPI options
The update ensures that users do not trigger an invalid PDF export, causing an instant browser crash
Minor UI updates and bug fixes
The selected energy unit is now taken into account in hover tooltips Simulator-only
The month selector in the simulation start window has been restored Simulator-only
New wiki page on the usage of pipe heatmaps.
Changes Jan 21, 2026
Upgraded the Simulation dashboard Simulator-only
Added a Maximum Recuperation capacity variable to the direct heat recovery analysis
The variable dynamically updates associated graphs and KPIs, improving analysis capability of residual load
The variable is pre-filled with the maximal heat recuperation capacity from the simulation
Added a simulation time indicator to provide context from when the displayed results originate.
Introduced Add to Clipboard on dashboard graphs for easy integration with spreadsheet-like programs.
The design heat flow used for the Equivalent Full Load Hours calculation can now be customised via the dashboard measurement BC.
A new wiki page has been added with a detailed interpretation of the simulation dashboard, which you can consult here
Pipe heatmap export with canvas scope
PDF download of pipe heat maps on scope “canvas” are now fully supported
Each canvas now receives a specific legend with corresponding colour coding of the pipes.
Canvas selection for the PDF export
User can now select which canvasses to include in the PDF export.
The functionality allows users to download schematics in a more tailored way
In big models, selecting fewer canvasses increases the success rate and download speed
Pipe pressure losses split in linear/fitting pressure losses Calculator-only
Pipe pressure losses are now separated into:
Linear pressure drop:
The gradual loss of fluid pressure over a pipe segment due to friction with the inner wall.
The linear pressure drop is characterised by design conditions and pipe properties
Fittings pressure drop
The sum of localised losses of fluid pressure caused by components or singularities in the system, like elbows, inlets, outlets, contraction/expansion, etc.
The fittings pressure drop is characterised by a ζ-value (zeta value)
The pressure drop per unit length parameter is updated to linear pressure drop per meter for better allignment with engineering practices, excluding fitting losses.
The pipe dynamic label is updated correspondingly
Minor UI improvements and bug fixes
Fixed issue where Break-into Pipes did not correctly mark the model as modified.
Improved warning detection for buffer vessels operating below 4 °C when glycol is already used as medium.
Added validation checks to ensure valid input for the Tap Profile Generator. Simulator-only
Introduced temperature checks for the Hydratech Coolflow DTX medium to ensure operation within valid temperature ranges Simulator-only
Beta Release
Beta features provide early access to functionality that is still under active development. They allow users to explore upcoming capabilities and provide feedback that helps shape future feature releases. Beta features are optional and can be enabled individually via the User Preferences. They are disabled by default to ensure a stable and predictable modelling experience. Note that functionality offered as beta may change or be removed in future releases.
Beta-released features can be found under this section, complemented with the tag beta release.
First Beta release: IES Data upload in the thermal load generator beta release
You can now directly upload data files as exported by IES in the Hysopt software
The functionality allows for a seamless integration between IES and Hysopt
Changes Jan 5, 2026
Introducing the simulation dashboard, see simulation dashboard Simulator-only
The simulation dashboard is now available, providing structured guidance for post-simulation model analysis.
Provides an initial load assessment to quickly evaluate suitable energy centre concepts and indicative system sizing.
Includes three analysis sections: Energy, Direct Heat Recovery, and Cumulative Heat Balance.
Opens in a separate browser tab, allowing simultaneous analysis alongside the Hysopt model.
End units with integrated building load injection Simulator-only
Added new heat flow controlled end units for heating, cooling and changeover (see end units)
The new base circuits contain integrated control logic for easy integration of building simulation data or measurement data.
Snippets are available for each of the new Base Circuits for even faster integration of heat flow data in the model
New Base Circuit (BC): Thermal load profile generator Simulator-only
Introduced a new Thermal Load Profile Generator Base Circuit in generators (Control).
Enables direct import of external heat-flow or power profiles from building simulations or measurement data.
New Base Circuit (BC): Three-way mixing valve
Added a new three-way mixing valve base circuit to the distribution circuits (heating and cooling)
The new component provides more drawing flexibility when modelling mixing circuits
It is now possible to draw system layouts where pump and mixing valves are not located together.
New Base Circuits (BCs): Zoneless end units for cooling and changeover
Introducing dynamic end units without zone for cooling and changeover.
New fluid type: Hydratech Coolflow DTX
Added Coolflow DTX, an ethylene-glycol-based heat transfer fluid with antifreeze functionality, as new brine option on the expansion vessel.
More information on the medium properties and applications can be found on the website of Hydratech Coolflow
Search functionality in the Hysopt library
Added a search bar to the Hysopt library for finding specific base circuits quicker, improve overall model efficiency
Minor UI improvements and bug fixes
Improved robustness of temperature unit handling when changing units in parameter help windows.
Improved user feedback when exporting pipe heat maps with the scope set to Canvas.
Changes Dec 10, 2025
General performance boost of the Hysopt interface
The overall performance of the Hysopt user interface has been significantly improved.
Model interaction is now noticeably faster and more responsive
Performance gains are most apparent for large models, particularly those containing many components.
Custom P&ID identifiers are now applied to graph legends Simulator-only
Custom P&ID identifiers are now consistently propagated to graph legends.
The update improves readability and traceability during simulation analysis.
Upgraded the Ramp BC with relative to simulation start option
The Ramp BC (in control library) has been upgraded with a new timing option.
When enabled, the ramp starting time reference is the simulation starting date and no longer 1 January of the selected year.
PDF export now includes the pipe heatmap legend
Exported PDFs now include the pipe heatmap legend
This allows heatmap exports to be used as standalone documents in reports and project deliverables.
Temporary limitation: PDF export is currently not supported for heatmaps with scope set to “Canvas”
General UI improvements and bug fixes
Improved state of the floor plan layer after saving, preventing unintended layer resets.
Introduced support and error handling for models with only zero load propagation.
Updated vertical and horizontal alignment behaviour to always remain consistent with the Hysopt detailed grid.
Updated the visual representation of the changeover end unit to a more compact format.
Resolved UI glitch of the User Preferences window on smaller screens.
Changes Nov 26, 2025
Hysopt is now available in Microsoft Edge
Hysopt compatibility has been extended to Google Chrome and Microsoft Edge.
As the application is cloud-based, users can seamlessly switch between browsers at all times.
New heat meter box for custom in-depth energy analysis Simulator-only
A new heat meter box is now available under Energy Metering in the Control library.
The meter can be connected to sensors across the system to combine multiple heat flows.
This feature enables custom and in-depth analysis of system heat flow behaviour.
Minor UI improvements and bug fixes
Corrected the Kv calculator help in combination with refrigerants (under Pressure drop in design parameters). Calculator-only
Improved robustness of CSV file downloads for more reliable data exports. Simulator-only
Extended DPI options of the pdf export for better resolution on exported schematics
Changes Nov 12, 2025
Upgraded heating end units with improved return temperature behaviour in part load Simulator-only
Added a representation parameter to indicate whether the Base Circuit (BC) represents a single end unit or a group of multiple end units.
When the representation is set to “multiple”, an advanced parameter called Return temperature behaviour factor becomes available.
The return temperature behaviour factor allows for more realistic return temperature behaviour of a single equivalent end unit (which represents a group)
The upgrade allows users to take control of return temperatures within physical boundaries, avoiding unrealistically low return temperatures.
Added a streamlined pareto export and energy report option Simulator-only
The exported Pareto report is now identical in layout and content to the in-Hysopt pareto version
The same streamlined pareto format now also applies to the energy report, providing a clean energy overview of the model.
Raw Pareto exports remain available for custom post-processing Simulator-only
Users with custom post-processing tools built on the old, static pareto export can continue using the raw Pareto exports.
The raw variant provides a comprehensive and consistent overview of all production components and energy flows in Hysopt, independent of the model content.
Minor UI improvements and bug fixes
Fixed incorrect medium propagation on both sides of the polyvalent heat pump.
Improved error messages for invalid uploads of COP/power data or data files.
Changes Oct 29, 2025
Upgraded graph copy-to-clipboard with more data options Simulator-only
Extra option to solely select the data values (y-axis), excluding the time axis
The new option allows for smoother post-processing in spreadsheet software
Added support for mass- and volume-based glycol mixtures
Glycol mixtures can now be defined as mass-based or volume-based mixture
More information can be found in https://hysopt.atlassian.net/wiki/spaces/HRM/pages/3340304385/Expansion+vessel#General
Improved robustness of .csv export functionality Simulator-only
Improved robustness of exporting existing csv files from Hysopt
Minor UI improvements and general bug fixes
Added Danish krone (DKK) to the available monetary units Simulator-only
New error messages at low glycol mixture percentages to stimulate good design practices.
Fixed issue with auto-connect (Ctrl+A) when placing a zone on an end unit
Improved handling of the Enter key in the model explorer for smoother navigation.
Changes Oct 15, 2025
Introducing pipe heatmaps for advanced system-level analysis
Enable pipe heatmaps using the Pipe heatmap control window
Pipes are given a colour based on the selected variable using a scale detemined by the Scope and Mode settings
The feature allows a system-level overview to e.g. identify system bottlenecks or future extension opportunities
Component report: pipes are now grouped per application type Calculator-only
Pipes are now grouped per application type in the component list for a better pipe overview
Reintroducing tags to facilitate easy component grouping, see Tags
Easily make custom component groups by using the Tags framework (available when having a BC selected)
The tag framework allows you to create subsets of Base Circuits for e.g. fast group-level parameter adjustment or group-level Base Circuit movement
You can search for existing tag groups using the general Search
in the top ribbon bar.
Added search functionality to the operation list
A new search bar has been added to the operation list for to smoothen the workflow
Added AHU inlet overrides for more simulation flexibility Simulator-only
Three additional inlet condition overrides added to the AHU blocks (Inlet temperature, Inlet absolute humidity, inlet relative humidity)
The connectors allow users to decouple the inlet conditions from the external air conditions, enabling analysis of other use-case
Added AHU air flow connector for custom fan control Simulator-only
Additional output connector Air flow rate at the supply fan
The connector allows to implement a custom fan control without having additional duct sensors
Minor UI improvements and general bug fixes
Improved hover message readability during zoom-out
Added direct wiki links to all production unit Base Circuits for a more direct search on the wiki
Improved error messaging when encountering issues with custom pipe types/pressure profiles
Hybrid production parameters are now correctly updated in all design calculation steps
Resolved the wrong propagation of medium type at both sides of the heat exchanger for heating and cooling BC
Fixed translation of KV(s) in complex parameter window of Kv/KVs parameters
Changes Oct 1, 2025
Introducing break-into pipes
You can now snap components directly into pipes, allowing for faster and more intuitive model building.
Existing properties of the pipe are maintained over new pipe segments (exception: pipe length given to one segment)
New graph on controllers: setpoint when activated Simulator-only
A new graph has been added to controllers to display the setpoint whenever they are activated.
The feature makes it easier to troubleshoot and verify controller logic during simulations.
Improved handling of the temperature unit at room controllers Simulator-only
Room controllers now handle temperature units (°C/°F) more consistently across the Hysopt software
Minor UI updates and bug fixes
Introduced protection against illegal characters in parameter input fields
Improved robustness of new CSV file upload for column headers with number values Simulator-only
Bug resolve related to the temperature propagation over ventilation ducts
Changes Sep 17, 2025
Improved CSV Integration by adding customisation options in the user preference settings
You can now customise the column and decimal separator used in your CSV files, ensuring better compatibility with spreadsheet programs like Microsoft Excel.
Correct separators ensure automatic detection of columns and numbers in Excel and similar tools.
More information on the CSV format can be found in CSV Integration.
Added copy to clipboard functionality on graphs to quick transfer of Hysopt data to spreadsheet software (e.g. Excel, Google Sheets) Simulator-only
The functionality allows direct data transfer without downloading CSV files, enabling smoother integration with third-party software.