Release Notes

Changes Jun 4, 2024

Changes May 21, 2024

  • You can now filter identical Base Circuits (BCs) from a group selection using the button image-20240517-092706.png in the left ribbon bar.

  • Added a search bar to the inspiration library image-20240521-085505.png, allowing you to filter using any text criteria.

  • Introduced support for links within the same canvas (hotkey: L).

  • It is now possible to enlarge/shrink control elements based on shortcuts "Ctrl Alt +" and "Ctrl Alt -"

  • Text objects now have a new parameter Alignment to set the horizontal text alignment.

  • The layout of the Pump Installation Report has been improved

  • Some minor bug fixes and technical improvements

Changes May 6, 2024

  • Some minor bugfixes and technical improvements

Changes Apr 23, 2024

  • Thermal capacitance auto-scaling is now available for all production units.

  • Some minor bug fixes and technical improvements.

Changes Apr 9, 2024

  • Some minor bugfixes and technical improvements

Changes Mar 26, 2024

  • The capacitance of all the heat pump BCs and KVS values of two-way and three-way valves can now be calculated using automated scaling by Hysopt. This feature comes as an addition over the existing method of entering the values manually or using calculator.

Screenshot (257).png
Screenshot (256).png
  • The Hysopt Platform now features improved support for named user licenses.

    • Some licenses, like Hysopt BIM Syncer, require specific assignment to users. This has been made easier and more consistent.

    • Such licenses can now be assigned to users and will then only be applicable to those users.

    • If no licenses are assigned, only non named licenses will get applied, as used to be the case

    • If licenses are assigned, they take precedence over automatically applied licenses, so then all required licenses should be assigned.

    • If multiple licenses are assigned (max 1 of each type), the user will receive the combination of features from all assigned licenses

    • Steps have been taken to ensure that existing license behavior is respected

Changes Feb 27, 2024

  • A new cost component “Carbon emissions tax” is available for the Pareto Analysis

  • The Admin Portal is undergoing changes to improve support for user bound licenses, like the BIM Syncer.

    • As such the User edit screens are extended with a License Assignments section.

    • This will enable assignment of licenses to individual users, potentially differentiating which features are available to which users.

    • This is a preparation step. There is no enforcement YET of the selections made here. This will come in an upcoming release.

      • Hence, no changes are required and license assignment will be handled automatically

      • Expect the BIM Syncer license assignment to be integrated into this screen in an upcoming release.

  • New "Polyvalent four-pipe heat pump" base circuit has been added to both the heating and cooling libraries. The polyvalent four-pipe heat pump is a heat-pump based production unit that can deliver simultaneous heating and cooling, independent heating and independent cooling all in one system.
    For more info, see

Changes Feb 13, 2024

  • More than 1200 new weather profiles for North America (USA and Canada)

  • The model being copied is now visible in the paste box when using the copy-paste functionality. The paste box changes to the grey paste box for bigger models to ensure better performance

  • A new feature of 'Job list view' is now available, it is possible to get an overview of different activities such as simulations, sensitivity analyses that were processed in the past.

  • This gives an overview of information such as

    • The activity type, activity name and duration of activity.

    • The model name for the activity.

    • The launched date-time of the activity.

    • The user who launched this activity.

    • The current activity status.


  • Filtering of activities can also be done in this view, the filtering can be done on the basis of

    • Activity type

    • Current status of the activity

    • Activities started between a particular time period

    • Activities launched by a particular user

Changes Jan 30, 2024

  • It is now possible to select the whole control path for a selected control line with the shortcut “Alt + h”. The user first needs to select a control line and then press the shortcut.
    The color of selected control line is also modified to make it more visible against the white background, e.g., the control path connected to tap flow is selected after selecting a control line in this path

Changes Jan 16, 2024

Changes Jan 2, 2024

  • It is now possible to give variants a custom name when doing a sensitivity analysis.
    This name is also used in Pareto and for the generated model.

Changes Dec 18, 2023

  • Labels and dynamic labels can be rotated on a canvas (with shortcut 'R').

Changes Dec 5, 2023

  • Thermal storage anti-cycling volume determination will now be applied even if primary design heat flow and/or regime are locked.

  • Active mixing bypass valve can now be calculated correctly in situations where the primary pressure drop is zero.

Changes Nov 21, 2023

  • Heat Pump Chillers will now report design power in Energy Report

  • Improvements regarding authentication expiration

    • No more premature termination of authentication session

    • Possibility to recover from expired an authentication session

  • It is now possible to assign manufacturer specific HIU’s and pump groups to the electricity meter boxes, for more info, see

Changes Nov 7, 2023

  • The button to activate the Simulation mode has been moved from its original location to the top menubar of the Designer.


  • A canvas link can be renamed using the same tool to create one.


  • An HIU with embedded tap profile, for faster modelling, is added to the library.

Changes Oct 24, 2023

  • What’s New introduction

    • When new features are introduced a small message will show on first use, highlighting the new features

  • Sensitivity Analysis and Partial Load functions have moved

  • New navigation to the Sensitivity variant input is available in the top menubar of the Designer.

  • New unit selections in Model Settings

    • Monetary Amount related units are introduced

    • Usage of these units will be gradually introduced in upcoming releases

  • Some minor bugfixes and technical improvements

Changes Oct 10, 2023

  • New base circuit available that measures automatically all electrical consumption and production within the system
    See for more info

  • Absolute or relative input of the supply temperature of a heat exchanger for cooling
    See for more info

Changes Sep 27, 2023

  • Fix for issues with dynamic labels

    • Insert of models with dynamic labels (on some base circuits) was broken

    • Adding dynamic labels (on some base circuits) on floorplans was broken

  • Fix for issue with zone assignment of complex BCs

Changes Sep 26, 2023

  • Some models created between Sep 12, 2023 and Sep 26, 2023 , might have a deprecated diversity standard (based on DIN1988-300 v1) defined by default.
    If that's the case for your model, the diversity standard will be automatically upgraded to the newer version (based on DIN1988-300 v2) when you open it again. This might influence (improve) your diversity calculations a bit.

  • Simulation results are no longer lost on any save. They are retained until a change is made that could potentially influence the results.

    • E.g. Adding labels, moving BCs, ... should no longer lead to loss of simulation results

    • E.g. Changing a parameter, pipe length, model settings... will still lead to loss of simulation results on save as they constitute changes that will affect simulation results.

  • Introduction of multiple x-axes in graphs: we display multiple x-axes for the use cases where different series with different x-axis units get shown together.

  • Showing general simulation details in the sensitivity status page, i.e., start date, duration, weather profile are now visible in the sensitivity status page.

  • Some minor bugfixes and technical improvements

Changes Sep 12, 2023

  • Absolute or relative input of the supply temperature of a heat exchanger, more information:

  • Non-operational temperature in setpoint profiles

    • in addition to day and night temperature, the temperature of non-operational period(s) can be configured

  • Some minor bugfixes and technical improvements

Changes Aug 29, 2023

  • New layers functionality

    • Toggle Canvas information

      • Text

      • Zones

      • Control

      • Floorplan

    • Note: The Canvas Selection button has received a new icon and the previous icon now serves to provide access to the Layers functionality

    • This layers functionality replaces the toggling effect of some of the library buttons

  • Some minor bugfixes and technical improvements

Changes Aug 15, 2023

  • New Zone Wall Temperature plot

  • New Thermal Storage Tank volume determination algorithms

    • Anti-cycling algorithm for the dimensioning of a storage tank in connection with a CHP (Combined Heat and Power) system, based on the Dutch ISSO publication 96 standard

    • Peak shaving algorithm for the dimensioning of a storage tank wih secondary HIU's, based on commonly used practices

    • More info:

  • More BC's are now assignable to an electric meter box

    • production

    • header configurations

    • thermal storage

    • ambient exchange

    • change over

    • (ATES and HIU's will follow soon)

    • More info:

  • Some minor bugfixes and technical improvements

Changes Aug 1, 2023

  • Some minor bugfixes and technical improvements

Changes Jul 18, 2023

  • side navigation has been replaced by the new application bar

  • new start page for the designer with direct access to the model explorer and inspiration library

  • introduction of our new right sidebar

  • canvas selection has been moved to the right sidebar

  • current canvas name is visible (again) in the application bar

  • operation selection has been moved to the right sidebar

  • in addition to seconds, duration parameters can now also be entered in minutes and hours

  • heatpumps show calculated SCOP and SEER

  • heatpumps show start/stops per compressor stage if applicable

  • new Basecircuit "DesignValuesExtractor" to inject design values into your control logic

  • Some minor bugfixes and technical improvements

Changes Jul 4, 2023

  • Added modulation delay parameter for Heat Pumps

  • Some minor bugfixes and technical improvements

Changes Jun 28, 2023

  • The "Replace Base Circuit" operation (Ctrl+H) has been improved, connections are preserved in more situations

  • Some minor bugfixes and technical improvements

Changes Jun 23, 2023

  • Thermal Storage base circuits now show warnings when invalid temperature regimes are configured.

  • Heat pump base circuits can now be configured with VSD and fixed speed compressor configurations.

  • Integral series per month now take into account the actual days of each month in the simulation period, instead of always using 31 days.
    (Integral series per month are only calculated if the simulation period starts on the first day of a month)

  • Error and Warning counts now also shown after simulation

  • Some minor bugfixes and technical improvements

Changes Jun 6, 2023

  • Error and Warning counts now added to dialogs:

    • System Check

    • Compute Design Flows

    • Optimise Components dialogs

  • Some minor bugfixes

Changes May 23, 2023

  • Some minor bugfixes

Changes May 9, 2023

  • Some minor bugfixes and technical improvements

Changes Apr 25, 2023

  • New CIBSE CP1 based Managed Pressure Profile available

    • See for more information

  • New Control BCs available for commonly used boolean operations (Updated documentation will follow)

    • And

    • Or

    • Not

  • Multi-color chart series highlighting

    • Hovering over a chart will highlight each featured series over the associated canvas element

    • Multiple series of the same element will lead to a multi-color highlight with each series color represented

    • This should allow for easier identification of the chart series on the canvas

  • Minor bug fixes

Changes Mar 28, 2023

  • Improved search functionality. Next to tags and labels, it is now possible to search within labels and component names. Either on the current canvas or across all canvasses.

  • Some minor bug fixes.

Changes Mar 14, 2023

  • Improve chart usability

  • Minor bug fixes

Changes Feb 28, 2023

  • Major UI release

    • Restyled Parameters

    • Collapsible Sidebar

    • Enhanced Charts for simulation results

      • Updated visuals

      • Extra export possibilities

      • Full screen view

    • Updated URLs

    • Minor sensitivity tweaks

      • Unit selection

Changes Jan 31, 2023

  • We are proud to announce that the Hysopt software has been validated by the ISSO institute:

  • New default values for zone volume and window U-value parameters

  • Minor bug fixes and UI updates

Changes Jan 17, 2023

  • Minor bug fixes and UI updates