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 2025-10-28

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 Expansion vessel

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 2025-10-15

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 2025-10-01

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 2025-09-17

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.

Introduced direct wiki link for more guidance on all Data file base circuits

• The new feature makes it easier to find relevant documentation and guidance on specific base circuits.

• More Base Circuits will be coupled to its corresponding wiki page in the near future

  

Improved fallback and retry mechanisms for more reliable solver Simulator-only

• Complex models will now encounter fewer numerical simulation failures, ensuring a smoother workflow.

Improved unit display in dynamic labels and graphs

• Simulation graphs of all Heating Curve BCs and Outdoor Air Temperature BCs now use the selected temperature unit. Simulator-only

• The selected unit for the velocity quantity is now correctly applied in the dynamic label of pipes.

Minor UI improvements and bug fixes

• Added extra validation checks when uploading CSV files Simulator-only

• Bug fix: saving a continuously-on activation profile is now possible again Simulator-only

Changes 2025-09-03

Modified column added to the model explorer for better model navigation

• A modified column is now added to models in the model explorer indicated the data when last saved

Better user guidance for parameters primary power percentage and heat flow on primary gate in all hybrid productions BCs

• The primary power percentage is now an overrideable output parameter with lock icon (see figure below).

  • If unlocked: Value from primary power percentage (output mode) gets calculated from the heat flow on primary circuit (input mode)

  • If locked: primary power percentage (input mode) serves as input and the heat flow on primary circuit (output mode) switches to an output parameter

• The implementation ensures that all hybrid production base circuits are now alligned with the input view

• For more information on parameter types (input, output, overrideable output) in Hysopt, see parameter types

Better user guidance for heat exchanger parameters: UA value and primary return temperature

• Design of heat exchangers can happen in two ways:

  1. The primary supply temperature and primary return temperature are the inputs, from which the UA value is calculated during design calculations

  2. The primary supply temperature and UA value are the inputs, from which the primary return temperature is calculated during design calculations

• If the UA value is locked, the return temperature will now switch automatically to an output parameter for better clarity to the user

• The implementation ensures the design of heat exchangers is alligned with the input view

New element tooltip with enhanced zoom behaviour

• Enhanced zoom behaviour when zooming in

• Updated the layout of the element tooltip

Efficiency table (COP, EER, TER, Boiler efficiency) file names of production units now remain saved in the model for better file tracking

• If you update the efficiency table of any of the production units, the file name is saved to the Hysopt model

• The change allows users for better tracking their files

Improved calculation of the room controller comfort levels when the activation signal is off Simulator-only

• Comfort level of room controllers are now unaffected by the thermostat state during periods with Activation signal 0

• The change improves usability of the comfort levels for ensuring no comfort issues are present in simulation

New graphs added to the auto-assign electric meter box and pump Simulator-only

• Auto-assign electric meter box: Load duration curve added which allows for peak assessment of the total electric load

• Pumps: Volume flow rate graph added to all pump base circuits for smoother simulation pump analysis

Minor UI updates and bug fixes

• Updated the lock icon at overrideable output parameters

• Improved precision of timestamps when downloading graph data as csv-files Simulator-only

• Alligned order of matching simulation parameters of pipes and sensors Simulator-only

• Setpoint and activation profiles are now supported as sensitivity inputs Simulator-only

• Alligned order of DHW tapping types (shower, baths, …) over all occurences in the software

• Added prefiltering of the current user to the activity list

Changes 2025-08-06

Introducing Input View, see Input View

• Input view mode is now available and can be activated with the button in the top ribbon bar

• The input view highlights components with untouched inputs that are required to be changed to get valid calculations/simulations

• The mechanism can be applied to mark components as Done or To Do for better project tracking

• Customisation possibilities are available under user preference settings

• 

Better user interaction for buffer vessel sizing methods

• The chosen Volume determination mode now changes the design volume parameter to either input or output correspondingly.

• The update improves the user guidance when applying sizing methods at buffer tanks (heating)

Added support for data files larger than 20 MB Simulator-only

• Models with data files larger than 20 MB can now be saved and simulated.

Improved handling of invalid temperatures at ideal production units Simulator-only

• Introduced error handling of invalid temperatures at ideal production units ( ESIM012011 )

• Users are now guided to solutions via the message overview in this particular situation

Minor UI updates and bug fixes

• Chart lines now use precise x-values for smoother curves Simulator-only

• Updated visual of “on/off valve” Base Circuit, making it more discernable among all 2-way valve distribution circuits

• Bug fix that caused duplicate error/warning messages

Changes 2025-07-23

Introducting new hotkeys (see operations )

• "G" for Graphs: Quickly open graphs with the new G keyboard shortcut for faster navigation. Simulator-only

• “Shift + G” for tichelmann pipes: Flip Tichelmann pipes direction with the new Shift+G keyboard shortcut.

Improved Decimal Separator Handling

• A comma in user input is now automatically translated to a dot as decimal separator, reducing erroneous user input.

• The dot separator is the uniform decimal separator in Hysopt.

Data Files: CSV File Name Storage Simulator-only

• Data File Upload: the file name of custom files are now saved in the model

• The update allows better project tracking by maintaining context of each uploaded file

Enhanced error message when wrongly combining application types

• Hysopt now highlights the location at which applications are wrongly combined, reducing error search and solving time.

• Most common example: accidentally combining a heating component in a cooling circuit

Minor UI updates and bug fixes

• Updated the simulator view: Operation mode for pumps Simulator-only

• Enhanced placement of date picker in simulation settings dialogue Simulator-only

• Recovered correct display of calculation results at the expansion vessel BC

Changes 2025-07-09

Added extra simulation values (VWRT, PWRT, VWTD) to all pipes Simulator-only

• Reduces the need for virtual sensors to retrieve relevant simulation data

• Extra available simulation values:

  • VWRT: Volume-Weighted Return Temperature

  • PWRT: Power-weighted Return Temperature

  • VWTD: Volume-weighted Temperature Delta

Ideal production units are now capped to the maximal capacity Simulator-only

• Ideal production units comprise the Fuel Boiler with Setpoint and Electric Boiler with Setpoint

• These units now limit the output heat flow to the capacity of the unit, instead of simply providing the setpoint temperature

• For an ideal unit without any capacity limitations, deactivate the Limit secondary heat flow toggle under advanced parameters

Improved transient end unit behaviour in changeover situations Simulator-only

• End unit behaviour (radiator, underfloor heating, …) improved for more realistic behaviour in changeover situations

Controls and zones are now visible in shared models

• Controls and zones are now visible in all shared models

• If these libraries are irrelevant for your situation, you can hide them under Layers
  

  

Minor UI changes and bug fixes

• Updated the calculator focus-view Calculator-only

• Resolved minor bug with Tichelmann pipe system

Changes 2025-06-25

New Base Circuits available in the changeover library

• Reversible heat pump with just a 2-pipe connection at the system side

• Three types of storage tanks: 2-pipe, 3-pipe and 4-pipe storage tank

• Passive dividing circuit consisting of 3-way valve in return

Buffer vessel graphs now show the height of temperature readings Simulator-only

• The graph Temperature - Breakdown at buffer tanks now shows the height (bottom = 0%) of each temperature reading

BTES 1.0/1.4 simulations now correctly take into account glycol mixture properties Simulator-only

• BTES 1.0 and BTES 1.4 encountered (small) energy flow inconsistencies when working with non-water medium

• Those issues are now resolved, and might have a small impact on existing model’s simulation results.

Unsaved changes dialog updated with cancel option (Esc)

• A clear cancel action has been added to the unsaved changes dialogue

Minor UI improvements

• Improved user guidance when copying shared models

• Mollier diagram updated to most recent version

Changes 2025-06-11

Added quota indicator in the job overview for running and available calculations Simulator-only

• The amount of simulations are limited per user

• The quota indicator in the activities overview indicates the amount of running simulations against the available simulations

Improvement on pipes: Pipe label readability and heat flow graph are available at all pipes

• The structure and readability of the pipe labels improved

• Added heat flow graph at all pipes, reducing the need for sensors for analysis purposes. Simulator-only

Model Explorer: Ctrl+Click model now opens model in new browser tab

• Allows to quickly compare models side-by-side over multiple browser tabs

New graphs available for utility meters and reversible heat pump BC Simulator-only

• Electricity and gas meter: Load duration curve

• Reversible heat pump:

  • Heating - Electric consumption

  • Cooling - Electric consumption

Enhanced behaviour of loading graphs after year simulations Simulator-only

• Graphs of all selected BCs will now open correctly on first attempt.

Unconnected control nodes no longer block design calculations

Changes 2025-05-28

General software performance upgrade

• AHU postheating now uses highest-capacity design mode

• Improved the On/Off room controller for cooling Simulator-only

• KV values better formatted in the component report

• Pumps in series now reported as error, not warning

• Vertical and horizontal alignment of elements on the canvas

Changes 2025-05-14

Introducing new focus view tailored to the Hysopt Designer

• Designer-users now have a default focus view for a smoother workflow, optimised for system design.

• Combi-users can choose between different view perspectives using the drop-down in the top corner.

Added Inspiration Library search on labels (e.g. New, Best practice)

• Allows to quickly search for a relevant subset of inspiration library templates

• List of current labels in the Inspiration library: New Automated Control Best practice Case Example Bad Practice

Enhanced interface for selecting variables in graphs Simulator-only

• Search bar functionality, including a clear all button

• Variables are now clearly grouped per Base Circuit type or Component type

Improved auto-connect (Ctrl+Shift+a) and quick select (Ctrl+Shift+Click BC) feature

• Auto-connect now only connects Base Circuits of identical application types

• Quick select (Ctrl+Shift+Click BC) now operates independently from the open library

• Both updates allow for quicker modelling on the canvas

Minor UI changes and bug fixes.

• Sensitivity analysis process has been improved Simulator-only

• Sensitivity folders in the model explorer are now instantly created when starting a sensitivity analysis, bypassing a reload. Simulator-only

• Auto-connect (Ctrl+Shift+a) at mixing circuits revived: Drop PI-controller (+) on mixing circuit with auto-connect activated Simulator-only

Changes 2025-05-07

Introducing Air handling and ventilation

You can now model, simulate and optimise air handling systems in Hysopt.

• View design conditions on the Mollier diagram

• Auto-design coils, recuperators & humidifiers

• Analyse heat recovery (thermal wheel, mixing, cross)

• Visualise duct airflow & simulate CAV/VAV control

• Combine air and UFH heating in hybrid setups

Link webinar: https://landingpage.hysopt.com/best-practices-for-sustainable-hvac-design

Link training : log in on the Hysopt Academy page

Changes 2025-04-30

New energy centre templates added to the inspiration library

• New templates comprising reversible heat pumps and polyvalent heat pumps in multiple configurations from parallel, shunt and serial.

Introducing a new Hysteresis BC for non-temperature applications Simulator-only

• Two types of hysteresis BCs now exist

  • One for temperature applications sensitive to the temperature

  • One for general applications, regardless of any units.

Complemented operation list with canvas link navigation (Ctrl+click)

General software performance upgrade

• Reduced waiting time for

  • Loading the application

  • Opening the inspiration library

  • Applying filters in the inspiration library

Changes 2025-04-16

Introducing minimisation of graphs for smoother simulation analysis Simulator-only

• The set of minimised graphs appears as tabs in the bottom left-corner of the canvas

• You can easily re-open complex graph configurations from the minimised tab

Improved pump head calculation of the ATES 1.2 Base Circuit Calculator-only

• ATES 1.2: Cold deposit pump now accurately takes into account all pressure drops under all circumstances

• Minor pump size deviations are expected in existing models

Extended quick access functionality with more recent models

Changes 2025-04-02

Added new Changeover library with new Changeover Base Circuits, see Changeover

• new basecircuits : pumps, PICV, endunits, sensor, resistance, …

• new calculations : system check, pump sizing, PICV sizing, …

• Examples can be found here: Change-over examples

Opening Pareto now automatically opens the corresponding model folder Simulator-only

• Opening Pareto Analysis from within a model now opens the corresponding model folder

• The functionality allows users to reach their relevant models faster to quick-perform Pareto Analysis

Pareto reports can now be printed/downloaded to save them locally Simulator-only

• A print button has been added to the pareto report

• Using Print to pdf allows you to save Pareto reports locally

Added extra imperial units for power variables: MBH, MBTU/h

Changes 2025-03-19

Added Hysopt Simulator view to filter simulation-relevant parameters Simulator-only

• Simulator-users now have a default focus view for a smoother workflow, optimised for simulation-only projects.

• Combi-users can choose between different view perspectives using the drop-down in the top corner.

Enhanced PICV design: Auto-adapt minimal Δp requirement to design Calculator-only

• The Minimal valve pressure loss of PICVs is now automatically scaled based on the design flow rate through the valve

Excessive pressure loss warning on pipes for issue prevention

• Pipe segments exerting excessive pressure loss per length are now highlighted with a warning message

• The warning avoids users to continue the calculations with an overlooked pipe diameter.

Minor UI changes and bug fixes.

• Updated the default pipe label information to a more streamlined view (shift pipe label types using ctrl+k)

• The dynamic label of pipes now contains the parameter value pressure loss per length Calculator-only

• The path of most resistance of pumps is now coloured based on the application type

  • Red for heating

  • Blue for cooling

Changes 2025-03-05

Added recent model access in the Hysopt model explorer

• A left ribbon is added to the Hysopt model explorer for quick access features

• The recent models list allows you to quickly open one of 10 most recent models

• You can also quick-navigate to the folder of a recent model using

Input (I) & Output (O) control connectors are now visually distinct Simulator-only

• You can now easily differentiate control inputs from control outputs at a glance

• Input control connectors are now lightgrey and annotated with an “I”

• Output control connectors are darkgrey and annotated with an “O”

Save reminder settings are now adjustable under user preferences, see User Preferences

• You can adjust the time interval inbetween save reminders, or completely deactivate the functionality

• 

Upgraded PICV model for enhanced simulation behaviour

• The upgraded PICV model ensures that “Actual Flow Rates” are now more accurately calculated

• Minimal impact on existing models expected (< 3% volume flow rate changes at PICVs)

Changes 2025-02-19

Introducing a save reminder (30 Min.) to avoid losing recent changes

• The save reminder prevents potential data loss from an unexpected system/browser crash

Introducing Pressure Drop in Design by default in the Hysopt library Calculator-Only

• Pressure Drop in Design is now default when selecting a Base Circuit from the Hysopt library

• Hereby, Pressure Drop in Design replaces Kv values.

Improved hydraulic calculations of the generic HIU Base Circuits Calculator-Only

• The updated calculations have a limited impact on the output of Optimise components in existing models

Small UI changes and general bug fixes

• Mouse now exactly follows a node whilst dragging

• Improved usability of the Kv value input help calculator Calculator-only

• Advanced view is deactivated by default for new users

Changes 2025-02-05

Canvas link highlighting when navigating between links (Ctrl+Click)

• Ctrl+Click on a canvas link will now combine “navigation to” and “highlight” the end link

• Allows to quickly identify the arrival node of any canvas link connection

Pressure drop in design introduced in the snippet library

• All input Kv values will be pre-configured to pressure drop in design parameters in all snippets

• The implementation provides realistic pressure drops over any component, whilst being automatically adjusted to any design situation.

Info box displayed when toggling auto-connect (Ctrl+Shift+A)

• An info box will now show if the auto-connect toggle is activated or deactivated when using Ctrl+Shift+A

Implemented minor bug fixes and technical improvements

• Messages overview: Maintain Base Circuit selection when using navigation functionalities

• Improved visuals of overrideable output parameters when in a group selection

Changes 2025-01-22

Introducing Pressure Drop in Design

• All Kv value input parameters (end units, production units, …) can now be expressed as a pressure drop in design

• The submitted pressure will use design condition properties to auto-scale the Kv value.

Kv(s) values (Metric) can now be expressed as Cv(s) values (Imperial)

• New unit introduced in the unit list of model settings

Upgraded expansion vessel Base Circuit with extensive documentation, see Expansion Vessel

• Improved parameter guidance

• Extensive documentation to guide user to proper expansion vessel sizing

• Improved the expansion vessel sizing method to facilitate more design situations

Updated the parameter list layout for better readability.

• Wider parameter list ribbon bar

• Better visibility of lengthy parameter names and lengthy parameter values

Improved the messages overview layout and navigation tools, see message overview

• Introduced arrows to navigate through identical error occurences

• Click on the error/warning/info icon in the messages overview to search the wiki

Improved operating range of chillers’ default performance tables

Minor UI changes:

• Visuals of node error improved.

• Improved the inspiration library buttons to state the functionality better

• Introduced a tag at shared models to highlight that the model is uneditable.

Changes 2025-01-08

Introducing the message overview, see message overview

• The message overview provides a concise overview of all error, warning and info messages in the model

• The message overview can be opened with in the top ribbon bar

• In the message overview, you can easily navigate through different occurences of the same error/warning

• By clicking or more info, you will automatically be directed to the corresponding documentation page.

Introduced orthogonal movement (Shift+Drag) on the Hysopt canvas

• Constrain your drag movement to purely horizontal or vertical movement using this new functionality

• Allows you to easily build and maintain structured Hysopt models.

Added user guidance and refresh option to floor plan upload page, see Floor plan manager

• User guidance helps users applying the new zoom and pan view functionalities

• Reload button introduced to refit the floor plan to the available space

New hotkey: Quick select BC from library (Ctrl+Shift+Click).

New hotkey: Free rotate on floor plans (Ctrl + Shift + mouse move).

Changes 2024-12-11

Updates in the Hysopt model manager

• You can now create Hysopt models outside a project for improved file structuring (if your license allows)

• You can now delete projects and non-empty folders (if your license allows)

Pipe diameter dropdown improved for better usability

• You can now adapt the pipe diameter directly without having to lock upfront

Pareto graph visuals enhanced for multi-screen support

Glycol mixture calculation bug at production units resolved

• Several production units encountered (small) energy flow inconsistencies when working with non-water medium

• Those issues are now resolved, and might have a small impact on existing model’s simulation results.

Changes 2024-11-26

Floor plan manager: Introduced zoom and pan for improved scaling, see Floor Plan Manager

• You can now zoom on a floor plan in the floor plan manager by scrolling the mouse wheel when hovering over the floor plan

• You can now pan over the floor plan in the floor plan manager, using either the right mouse button or the middle mouse button, depending on your user preference settings.

• These enhancements make scaling of floor plans more precise and efficient.

New BC: 2-pipe storage tank now available in the cooling library

New BC: 3-pipe storage tank now available in the cooling library

Bug fix: User preferences now accessible on all screen sizes.

Changes 2024-11-12

Grid layer added to Hysopt canvas (Toggle with Alt+G), see Grid Layer

Detailed grid layer added to Hysopt canvas (toggle with Alt+Shift+G), see Detailed Grid Layer

Updated cooling tank visuals to clarify connection heights.

• Cooling tanks using water as storage medium typically supply at the bottom of the tank and drain from the top.

• The new visuals clearly display the standard situation to users

Fixed environment temperature display in pipe insulation input

• The latest input is now correctly shown to the user when re-opening the pipe insulation parameter window.

New snippets added to the cooling library, see Snippets

• Heat exchanger for cooling: Secondary temperature control

Changes 2024-10-29

Advanced tag added to signify less-crucial parameters, see Advanced Parameters

Typically for parameters that are more complex or already have suitable default values.
Ideal during project stages where detailed information is still unavailable.

Toggle for advanced parameters added in the top toolbar, see Advanced Parameter Toggle

Provides a "focused view" by displaying only the most relevant parameters.

Visual differentiation for "default" values for better change tracking, see Change Tracking

Added option to toggle the visual changes for default values in user preferences.

Configurable list of units for new models added in user preferences, see User preferences - Unit list

Simulation bug with Central Heating on ILS blocks fixed

Changes 2024-10-15

• Two new base circuits! Learn more about them at Thermal storage heating

  • 2-pipe storage tank

  • 3-pipe storage tank with one top and two bottom connections

• New aggregation method based on CIBSE CP1 (2020) is now available under model settings. More info can be found here .

• New snippets for cooling are added to the library for faster modeling.

• Improved UI: Input parameters (white) are now visually distinct from output parameters (grey) for better clarity.

  • Input parameters now feature a white background, indicating they are editable by the user.

  • Output parameters now feature a grey background, signifying they are the result of a calculation.

• Lockable parameters now behave more intuitively

  • Whenever the parameter is not locked, it is shown as an output parameter with a grey background

  • Whenever the parameter is locked, it is shown as an input parameter with a white background

  • Automatic locking introduced whenever user submits data for improved user experience.

• You can find more info on the new parameter visualisations here .

Changes 2024-09-24

• Sensitivity analysis is now possible on the Temperature constant

• Two new manufacturer specific HIUs are available:

  • Baxi AquaHeat HI

  • Baxi AquaHeat HI/HWI

• A new Activation Signal Generator base circuit (BC) is now available

  • Similar to the Setpoint Generator, but simpler for general activation signal needs

• Misc. small improvements

Changes 2024-09-10

• PNG files are now supported for floor plans. Previously, only PDF files were supported, but now you can also use a PNG file to create a floor plan.

• Design Heat Flow and Regime parameters of various Thermal Store BCs have been updated to better indicate which can be set automatically and which need to be provided as input.

• It is now possible to give a color to nodes in a model.

Changes 2024-08-27

• Snippets with pre-configured controls are now available in the BC library for quick and easy model construction using the icon. More information at How to model your system .
  

  

  
  

• The Snippets library will be extended over the coming weeks. Send your snippet requests to support@hysopt.com .

Changes 2024-08-13

• Auto-scaling of the KVS-value of on/off valves is now set by default.

• Improved information in the dynamic labels of various heat pump base circuits

• Quick Drop On Canvas with Hotkey “Ctrl+D”. You can now easily place inserted templates or pasted clipboard content onto the canvas using the new hotkey "Ctrl+D". Simply insert your template or paste your clipboard content, and press "Ctrl+D" to instantly position it on your canvas.

Changes 2024-07-30

• Auto-scaling of the thermal capacitance of production units is now set by default.

• The programmable controller visuals have been upgraded. Users can now enter a custom display name to indicate the controller's application.

Changes 2024-07-16

• Control nodes now clearly specify units wherever applicable.

• Added a generic unit conversion base circuit (BC) to the control library, enabling convenient unit conversions over control lines. More info & how to use it at https://hysopt.atlassian.net/wiki/x/DICU2Q

• Introduced a new temperature constant BC for defining constant temperature setpoints in Celsius (°C), Fahrenheit (°F), and Kelvin (K). More info & how to use it at https://hysopt.atlassian.net/wiki/x/A4CV2Q

• A new base circuit “Dynamic electric boiler” is now available under the production units in the Hysopt library. More info & how to use it at Boilers

• You can now give custom names to the input and output connectors of the programmable controllers via the “Visuals tab”.
  

  

  You can also see these custom names when hovering over a connector on the canvas.
  

  

  
  And you can also see these custom names in the series names of the graphs.
  

  

  
  

Changes 2024-07-02

• Simulation parameters can be made visible by default through User Preferences

• New inspiration library templates:

  • Gas boiler and heat pump control, including cascades (up to 5 identical units).

  • Chiller and heat pump control for cooling systems, including cascades (up to 5 identical units).

  • Pump control for heating systems (constant and variable speed).

  • Low-loss headers, heat exchangers, and thermal store controls.

  • Serial and shunt configurations for combining gas boilers and heat pumps in heating systems.

Changes 2024-06-18

• Electrical power time series are now available in the graphs of electric immersion heaters

• We have introduced the option to add multiple non-operational periods for setpoint profile.

• Control lines can be colored using the newly introduced “Visuals“ tab

Changes 2024-06-04

• Reversible Heat Pump dynamic label has been extended

  • COP and EER have been added

  • Temperature regime for the design conditions have been added

• Polyvalent Four Pipe Heat Pump dynamic label has been added

  • Design conditions at design regimes

  • Pressure drops over the coils

• Some commonly used functions were added to the code syntax of the programmable controller (abs, floor, ceil, sgn, tan), more info on Programmable controller ((extra) large)

Changes 2024-05-21

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

• Added a search bar to the inspiration library , 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 2024-05-06

• Some minor bugfixes and technical improvements

Changes 2024-04-23

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

• Some minor bug fixes and technical improvements.

Changes 2024-04-09

• Some minor bugfixes and technical improvements

Changes 2024-03-26

• 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.

• 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 2024-02-27

• 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 Polyvalent four-pipe heat pump
  

  

Changes 2024-02-13

• 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 2024-01-30

• 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 2024-01-16

• New "Reversible heat pump" base circuit has been added to both the heating and cooling libraries. This new heat pump uses a reversing valve to switch between heating and cooling operation.
  For more info, see Reversible heat pump

  

Changes 2024-01-02

• 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 2023-12-18

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

  

Changes 2023-12-05

• 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 2023-11-21

• 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 Meter boxes

Changes 2023-11-07

• 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 2023-10-24

• 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 2023-10-10

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

• Absolute or relative input of the supply temperature of a heat exchanger for cooling
  See Heat exchangers (HX) for more info

Changes 2023-09-27

• 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 2023-09-26

• Some models created between 2023-09-12 and 2023-09-26 , 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 2023-09-12

• Absolute or relative input of the supply temperature of a heat exchanger, more information: Heat exchangers (HX)

• 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 2023-08-29

• 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 2023-08-15

• 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: Thermal storage sizing algorithms

• 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: Meter boxes

• Some minor bugfixes and technical improvements

Changes 2023-08-01

• Some minor bugfixes and technical improvements

Changes 2023-07-18

• 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 2023-07-04

• Added modulation delay parameter for Heat Pumps

• Some minor bugfixes and technical improvements

Changes 2023-06-28

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

• Some minor bugfixes and technical improvements

Changes 2023-06-23

• 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 2023-06-06

• Error and Warning counts now added to dialogs:

  • System Check

  • Compute Design Flows

  • Optimise Components dialogs

• Some minor bugfixes

Changes 2023-05-23

• Some minor bugfixes

Changes 2023-05-09

• Some minor bugfixes and technical improvements

Changes 2023-04-25

• New CIBSE CP1 based Managed Pressure Profile available

  • See Select pipes 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 2023-03-28

• 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 2023-03-14

• Improve chart usability

• Minor bug fixes

Changes 2023-02-28

• 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 2023-01-31

• We are proud to announce that the Hysopt software has been validated by the ISSO institute: https://over.isso.nl/nieuws/validatie-hysopt

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

• Minor bug fixes and UI updates

Changes 2023-01-17

• Minor bug fixes and UI updates