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[ Polski ][ Deutsch ]What's new in the current Version of Software AnTherm

Thermal bridge heat and vapour transfer simulation program AnTherm in its version 9 provides vast amount of functions and abilities which perfectly support the user in his daily work. Moved to the newest technology further improvements have been applied to the new version adding additional efficiencies when working with the software.

Continuous further development of the software up to its current version has been strongly influenced by users' feedback. Thanks to all subscribers for showing their trust to the project.

Since the project start in 2003, which followed the early works of 1980's and 90's, and the initial release of version 1 (deployed on 6th June 2005) further continuous improvements to the program have been achieved. In September 2007 the version 3 has followed the version 2 which has been made available in January 2007. After the version 4 has been deployed in November 2008 and the version 5 in March 2010. Technologically updated version 6 was made available in September 2010 which was followed by then Anniversary version 6.100 in June 2011. The version 6.106 continues implementation of major user wishes on the one hand, and additionally introduces the 4-D, time dependant, transient simulations for the year 2012. The version 6.114/5 optimizes the functionalities. The version 7.125 integrates the optimum of functionalities on top of the newest platforms.

Further intermediary versions are available to subscribers of the software maintenance (update-subscription) program.
Complete up-to-date Documentation, Manual, Short Reference and Tutorial make starting the work with this powerful application easy and straight forward.

New functionality in Version 9.136.2 (February 2019) compared to Version 9.136.2

Radiation Temperature:

  • AnTherm now contains an interface with SolRad. Results can be imported from SolRad in order to compute Radiation Temperatures in AnTherm from the Global Radiations and the Air Temperatures. This interface is a separate tool for the stationary case, and for the instationary case it is included in the Periodic Data Editor of the HARMONIC/TRANSIENT option.

Custom Material Database:

  • In addition to the Material Database there is now a Custom (User-Defined) Material Database. Every customer has the possibility to specify their own materials, save them and paste the data into the Element Editor.

New functionality in Version 9.136.1 (October 2018) compared to Version 9.136

Chi Value Calculator:

  • AnTherm now contains a tool to calculate the point thermal transmission coefficient (Chi Value).

New functionality in Version 9.136 (February 2018) compared to Version 8.133

Project Window:

  • AnTherm permits the combination of several model files to projects. Upon the user's wish a list of projects is displayed, the user is able to choose a project and then a model file associated with this project. In this way it is easier than previously to retrieve a particular model.

Inhomogenous Layer Calculator:

  • For inhomogenous layers (such as bricks) homogenous replacement constructions can be computed and the equivalent values can be retrieved.

Three-Space Psi Calculator:

  • The Psi value can now be calculated for a three-space case with an unheated buffer space.

New functionality in Version 8.133 (March 2017) compared to Version 8.132

DXF/IFC Import:

  • It is now possible to import 3-dimensional DXF files. Moreover, models created with Autodesk Revit can be imported as IFC files.

New functionality in Version 8.132 (November 2016) compared to Version 8.131

DXF Import:

  • The DXF Import now supports elements with slopes and roundings.

New functionality in Version 8.131 (March 2016) compared to Version 8

Surface Temperatures:

  • AnTherm is able to display a graph showing the surface temperature gradient of a room.

Include several images:

  • The user can now create several images in the Results 3D window and include them in the dynamic report.

New functionality in Version 8 (October 2015) compared to Version 7.126

Slopes and Roundings:

  • AnTherm now supports the input of oblique and round elements as well as the rotation of elements by an arbitrary angle.

Probe Point:

  • The selected probe point is visualized by a red cross in the Results 3D window.

New functionality in Version 7.126 (2014) compared to Version 6.114

Graphic related to the Psi-Value:

  • The automatic evaluation of the Psi-Value also displays a graphical visualization.

New Baubook catalogue:

  • The new format of the Baubook catalogue (formerly known as ÖBOX) is now supported. The data from the new Baubook catalogue can be imported into AnTherm.

Newest platform, Updated documentation, Comfort and Speed in Version 6.114 (November 2012) compared to V.6.106



Input, Data Entry:

Solver, die Calculation Engine:

Harmonic / Transient Solver:

Evaluation of Results:

Comfort, Specialities:


and much more...

Transient, Dynamic, Time-Dependant, 4D in the version 6.106 (December 2011/January 2012) compared to V.6.100:


Solver, the Engine:


4D, time dependant, transient evaluation:

  • The option TRANSIENT was introduced - it provides methods for thermal analysis of dynamic behavior of building constructions when boundary conditions are changing in time periodically and the effects of heat capacity (heat storage) must be considered - in addition to the HARMONIC option/a>.
  • For the main period of Year/Day/Custom can be defined how many harmonics shall be calculated (the harmonic periods are stored currently as integers, rounded):
    • Year: max of 365 harmonics,
    • Day: max of 24 harmonics,
    • Custom: max of 1000 harmonics. (internally the solver can go up to 2000 harmonics).
  • For the purpose of dynamic, transient problem (subject to the TRANSIENT option) the boundary conditions window mutates to allow input of time dependant quantities – preset with ConstantValue out of steady state problem.
  • The PPeriodic / Harmonic Data Editor supports creation, editing and management of timelines for various periodic data types: RegularPoints, RegularMeans, IrregularMeans, IrregularSteps, ConstantValue, HarmonicCoefficients.
    Graphical and Tabular input methods are provided.
  • Project file now stores Periodic Boundary Conditions (Spaces and Power Sources). For each Period (including MainPeriod=0 - steady state) a set of boundary conditions is retained as template (and available to be saved after boundary conditions are applied).
    All BCs will be merged by their Names into the projects BC-Template upon apply. This will retain BCs even when spaces or power source are renamed or removed from the project.
    Compatibility with the earlier versions is provided (TemplateBoundaryConditionValues will be read and moved to BoundaryConditionTemplates for the respective period).
  • For the evaluation the harmonic base solutions are combined with the respective harmonic coefficients of the boundary condition the belong to (complex linear combination). The resulting distribution harmonic coefficients it then passed for Fourier synthesis for specific evaluation time point T.
  • The number of harmonics used during synthesis (#Hsynth) can be reduced.
    Evaluating in with only 0-th harmonic or only Constant Boundary Conditions is identical to Steady State results
  • The Animate Time Dialog is used to define temporal animation of transient evaluation by automating changes to the evaluation time point T.
    Animated Results 3D renderings can be optionally recorded to an AVI file.
  • Timelines window displays synthetic, temporal, time dependant results at selected Probe Points together with timelines of synthetic boundary conditions applied.


Performance, parallelization (subject to MULTICORE-option):

Data Entry:


  • The runtime environment of AnTherm has been fully migrated to the newest MS Framework .NET3.5/4.
    This very extensive upgrade leads to much better runtime behavior of the application and provides next milestone towards further development.
  • The new installer (SETUP.EXE) will automatically download and install all required system components (is such additional components are required).
  • HARMONIC license feature replaces the lexically “curious” INSTATIONARY entry (still meaning HARMONIC option) in the activation file.
  • Some windows did not scale on some font-scaled Win7 systems
  • Textual output of space-elements (and surfaces) compacted, Rs output first, Alpha follows (in braces)
    Output of Material-elements has been compacted also (less white space).
  • Isosurface will now always include its normal vectors (unfortunately 100% slower on creation, but required for the scene export)
  • The number of equation above which a warning message shall be shown can be set by the user (by default 1.000.000 equations is currently seen as excessive, even the solver can go for about 20.000.000 - on 32-bit system). The warning message can be disabled too.
  • The new setting "MulticoreOptionActive" allows to temporarily turn off this option.
    Extended application settings "InstationaryOptionActive", "Stereo3DViewOptionActive", "MulticoreOptionActive" are now ReadOnly (instead of being hidden) when the targeted license option is not available.

and much more...

Anniversary version 6.100 (June 2011) compared to V.6:

Input and Model Entry:

Solver (the calculation engine):

  • If solver calculation bails out due to parametric constrains an additional diagnostic message showing the solution status (state of basis solution, solved/aborted, availability of the coupling coefficients matrix) is displayed (e.g. when solver aborts after reaching the maximum number of iterations set).
    The dialog shown also offers direct jump to solver documentation.
  • The coordinate data precision of the fine-grid has been doubled.
    Past projects resulting in more precise fine grid will be recalculated automatically when needed.

Evaluation and Reports:

  • The „Probe Points window“ lists locations for all extremes of all boundary conditions (spaces and power sources). The listing is updated upon update to boundary conditions. It can be used to easily „jump“ onto such extreme locations within Results3D window.
  • The „probe points report“ now shows warmest surface points (max), in addition to coldest points (min), for each space too.
    It displays extreme values (min and max) for all power sources also.

Extensions to 3D visualization and evaluation:

3D stereo view extensions:

  • New stereo modes added:
    • Checkerboard
    • Left- and Right Eye
  • Images rendered by passive stereo modes (i.e. now all modes except Crystal Eyes) can be exported as an image now too.
  • The Anaglyph Stereo Mode can be set to render compatible with further filter types of glasses (OpenGL-setting StereoAnaglyphColorMask).
  • New export modes for 3D Scene: X3D, X3D-Binary, POV-Ray


Comfort improvements and further fixes:

  • Dropping (drag & drop) a project file over the main application window will open that file.
    Dropping of a Waebru component file is also supported as a shortcut for quick import.
  • Import of Heat3 v.4 Files added.
  • The Element Browser columns Number/Type display coloured by element’s colour.
  • Power sources are still shown in red but now by using a transparent brush (the colour of elements overlapped by the power source shines through the brush net).
  • The selection of multiple elements in Elements2D window is emphasized with alternating white/black strokes (instead of white only line which was insufficiently visible).
  • Clipping planes of the camera are updated correctly even for 2D and 1D objects.
  • Layout fixes in “Register Underlay Image” for systems with scaled fonts.
  • Surface Edges are now colorized according to the evaluation scalar function chosen.
  • The default value of "OverwriteProjectWithoutAsking"=True (earlier False). The application will not repeatedly ask to name the project for already saved project data when results are requested.
  • New application setting “Help Window shown TopMost”: Help window will be shown topmost to application windows and automatically minimize with the application (this is the windows default behavior). When turned off (the default) the help window can be set behind the application window via typical desktop window manager.
  • Axes displayed on Elements3D are now shown at „Outer Edges“ (earlier „Closest Triad“).
  • On systems which virtualize OS folders (eg. Vista) the activation shall always proceed via the „Alternative License File AnTherm.HID“. The license file shall be placed into folder not controlled by the virtualization (e.g. user folder).
  • Saving 3D images is now possible even on very weak graphic systems with WindowsXP (e.g. Netbook with Intel Graphics).
  • Elements copied via the clipboard retain their overlapping order (the order is not derived from the selection order anymore).
  • Result fields of evaluations related to boundary conditions not connected to the heat transport network (model) are rendered blank within reports.
  • On systems older then Windows Vista (ie. Windows XP) the default setting "EnableVisualStyles = FALSE". This is required to compensate for implementation errors of the operating system (text of vertical tabs in Results3D window do not show).
  • New Application setting OpenGLSetting: ExplicitBackfaceProperty: will assign BackfaceProperty=FrontFace for modelSliceX, modelSliceY, modelSliceZ, model, sliceZ, sliceY, sliceX, isosurface, surface; Used to resolve rendering issues on (very few) systems rendering only one side of surfaces. (Workaround added to Documentation FAQ too)
  • Resolved compatibility issue raised on older Windows XP machines during image export of 3D renderings

and many more...

Technology, tooling and efficiency - the new version 6 (September 2010):

Thermal bridge calculaiton graphical model input, selection, undo/redo etc.New technology and platform, new techniques, new perspective:

  • Full technology migration to the new, proven MS .NET Windows platform: still simpler install, faster execution, shorter calculation times, automated runtime optimization of the program adjusting to technical equipment of the computer. The startup and shutdown of the application are fulgurous too.
  • Using the latest visualization platform in its newest version: still more exact, partly acquired patented algorithms, fully in double precision, new demand driven and efficient visualization pipelines.
  • Even cases numerically poorly conditioned can be calculated precisely and quickly without any user intervention (very detailed structures, slopes and curvatures modeled with detailed stepping, thin foils, holders, spikes etc.) - relaxation factor can now freely go up to the maximum of 2.0 without the risk of instability and eventual abort without reaching the solution (earlier 1.998).
  • New installation procedure (setup.exe) downloads and installs prerequisite Click-Once components (MS.NET 3.5 Runtime, Crystal Reports Basic Runtime for Visual Studio 2008).

1000 reasons to Undo/Redo - the whole works:

Improved automation of the Psi-Value (Ψ) determination:

  • The Ψ-Value determination has been reworked and redesigned to allow automated Psi-Value determination in further 2D cases by far.
  • Additionally the tool will automatically choose most logical U-Value profiles identified automatically - connections like "interior-interior" will be offered when other options are absent.
  • Layered constructs of the Psi-Value calculation can be edited, changed, saved or even independently loaded within the U-Value calculator.
  • If required one can manually override numbers used for calculation which where initially automatically determined.
  • In such cases for which no automated calculation support can be offered by the tool the message will be displayed - the manual calculation is still possible based on values provided in Coupling Coefficients and Modeling reports.

Anaglyph (3d binocular) stereo rendering of a thermal bridge calculation with vapour diffusionComfort and convenient simplification of data input:

Refined and additional output:

Further changes and improvements:

and much more...

Transient, fast and immersive - the version 5 (March 2010):

The capability matrix of the program functions has been significantly extended with additional options. In front of all the transient, harmonic, periodic extension together with high performance multiprocessor capability and frontier visualization technology complete the next major milestone in continuous development of the application.

New functional results:

  • Fully automatic calculation of the transient, harmonic thermal coupling coefficients (with HARMONIC-Option).
    The Coupling Coefficients Report displays matrices of harmonic thermal coupling  (one matrix for each chosen period given as complex number and as matrix of value and argument ). That output allows easy readout of Lpe (coupling coefficient exterior to interior) or time lag (phase lag, shift) values. Diagonal elements are significant (contrary to steady state case) and can be used for calculating effective heat capacities.
    Same as with steady state case there is no need to know nor to apply any boundary conditions to obtain these results!
  • New Secondary function „Relative Core Humidity %“ (with VAPOUR-Option)
  • Within the Boundary Conditions window can be decided if secondary functions for the Results3D-Evaluation shall be calculated.

Performance, speed, quality:

Benchmarks and conformity with standards:

Thermal Bridge, Heat Flux, Steram directions shown as hedgehog field arrowsNew and faster, more efficient 3D evaluations and visualizations:

More flexibility during data entry and model input:

Improved data import and import functions:

  • Import of Image underlay/overlay: For 3D projects there are up to three image underlay slots available - to the planes XY, YZ und ZX. The image will be displayed within the Elements2D window (either as underlay or transparent overlay).
  • DXF-Importer shall now read all common text file line endings: Windows (CR LF) - Macintosh (CR) - Unix (LF)
  • Within the DXF-Import Dialog one can set the number of decimal places at which coordinate values imported shall be rounded. DXF coordinates are now read in in double precision.


Culmination of improvements in the version 4 (November 2008):

The License Model has been extended with update-subscription program (software maintainance) providing instant access to newest developments during the subscription period to all subscribers. Furthermore, time limited one year licenses allow better budgeting of license fees simultaneously connected to the newest available version at each entrance to the next year subscription.

  • Fully automatic calculation of the linear thermal transmittance correction term Psi for two dimensional two-space cases (Psi-Value Determination).
  • Output of characteristic U-Values at adiabatic cut-off planes for two- and three dimensional heat bridges.
  • Characteristic indicators (coupling coefficients, points of critical temperatures, fRsi etc.) can be evaluated even for equations of many millions of cells (i.e. tens of millions of nodes) - thanks to better memory management implementation (remark: graphical evaluations can be switched off).
  • In calculations of models with power sources it is sufficient to supply one space (temperature) for successful simulation.
  • Projects can be saved within very deep directory structures or even onto network drives.
  • Processing of layered 3D projects is better supported with the new layer editor. Layered 3D models can be mirrored along Z-direction also.
  • Reordering functions of elements have been improved and extended (for better support of overlapping)
  • Graphical selection and editing functions have been improved (Lasso, Sizer)
  • 2D images (e.g. all 2D windows) can be saved or transferred via the clipboard (in addition to 3D views)
  • The material database can be extended with a download of modest ÖBOX materials
  • Material- and surface properties can be easily picked from other projects; The projects materials and surfaces lists can be sorted.
  • The calculation is reinitiated after any changes to solver parameters (e.g. precision settings)
  • The grid (equation) generator at material boundaries processes material changes (e.g. lambda ratio) at higher precision. The calculation will restart automatically if required.
  • The precision of the solver has been improved by the significant order of magnitude. Close-Up errors of less then 10-10 can be reached without any additional computational time. Same applies to temperature deviation (termination condition). Solution result of earlier calculations will be transformed to higher precision automatically.
  • The performance of the solver has been further improved (especially within the equation generator). Status view onto the solver process is not delayed anymore.
  • The calculation process (the solver) can be aborted at any time
  • The term „adiabatic cutoff planes“ introduced consequently instead of "wonder foils"
  • Higher precision of super fine grid of temperatures within areas of power sources.
  • Streamlines at corners of the boundary or adiabatic planes will not be missed.
  • Responsiveness and the level of interactivity of the 3D result view has been further improved even for extremely complex visualizations.
    The quality of colorful images has been increased even further.
  • The position of the colorbar can be arbitrarily changed.
  • The number of decimal digits for labels on isolines (t.g. isotherms) and colobar can be set arbitrarily
  • The mobility of licenses has be extended with the "hardware dongle option" (adjustment to the license model).
  • The English version of the program is supported with complete documentation in English.
  • The VAPOUR-option (if licensed) can be turned off temporarily.
  • The new tool "Simulation Folder Cleaner" supports quick removal (deletion) of simulation results created during earlier runs and not needed anymore
  • An alternative location of the license file can be set within extended application settings. The path can contain any valid URI (ie. http://server/path/AnTherm.HID).

Essential improvements in the September 2007 version 3:

  • DXF (Acad) Import has been reengineered to gain significant performance gain (factor of 10.000 !). This allows efficient and easy integration of very detailed CAD models into AnTherm. Such very complex models come into existence if, within CAD program, orthogonalization of modeled slopes and curvatures has been performed (this is required for AnTherm import).
  • Repaints of element list for very large and complex projects has been sped up significantly (now about 10 times faster). This allows efficient processing of models of even many thousand elements without disturbing latencies.
  • Speed of bulk operations (e.g. material assignment to many selected elements) has also been improved significantly. This allows efficient processing of models of even many thousand elements without disturbing latencies.
  • Context menus of element editing show names of spaces/rooms, power sources, groups, materials and surfaces in alphabetically sorted lists (according to the current language setting). This provides much easier element selection on these criteria.
  • f*Rsi is calculated by normalized definition f*Rsi = (T*si - Te)/(Ti - Te) (instead of 1-g0) – delivering same result for two-space-case for which, and only for which, it shall be used (for three- and more space cases g-values must be reported according to normalization - g-values are reported without any change compared to earlier program versions).
  • Mouse wheel can be used to Zoom or Roll within the 3D-evaluation (now consistent with graphical 2D input)
  • Zooming with the mouse wheel (within graphical input and evaluation) can be executed more precisely (the sensitivity of wheel movement have been lowered and configured more precisely).
  • The license file is being stamped with asymmetrical signature barring any transport errors.
  • Installation and execution within Microsoft Windows™ Vista has been ensured.

Mature functions published in earlier version 2:

Streamlines in equidistant intervals of heat stream created with AnThermStreamlines in equidistant intervals of heat stream (or vapor stream) from the space edge in 2D case. This evaluation is possible for 2D projects or other project types in which the modeled construction is fully homogenous in the Z-direction an no space connections exist in this direction.

Speedup and stabilization of Streamline evaluations. The „kernel“ of streamline evaluation has been reengineered significantly resulting in much better quality of results an high stability. Much energy has been brought into finding a compromise between speed, memory requirements and quality.
The integration step factor now relates to minimum step size of the  Runge-Kutta method. Actual step size is controlled and adapted automatically – from one fine grid cell to the next. This provides very detailed and precise presentation of streamlines for heat stream fields and vapor diffusion streams too!

User interface of project specific material- and surface lists has been reworked and improved. IBO BTK2006 materials (preliminary content) have been included into material database.

Accessing material properties (the material list) from element editor has been simplified and made much more intuitive.

Pressing F1-key shows context dependant help and information for currently active window.

Conductance matrix (coupling coefficients, Leitwertmatrix) can be exported to CSV file.

Within translate window the duplication can be initiated simultaneously. This is the main starting point for entering of more complex constructions, especially when modeling sloped ones.

multidimensional heat transfer analysis produced with the simulation software AnThermElement choice list is shown in tabular form containing type- and coordinate columns (past versions where shown unstructured).

Execution performance of element list has been significantly improved for showing very large lists and supporting massive bulk selections. This allows modeling and processing of constructions built of many thousands of elements.

Captions on axes and labels on isolines can be adjusted easily.

Selected isolines can be emphasized (as Tubes) (Bold each N).

3D visualizations can be controlled by 3D-keyboard navigation in addition to mouse control.

An Airspace calculator can be started from "Tools" menu - calculates equivalent heat transfer coefficient for small cavities. Many functions of this airspace calculator have been deeply integrated into the program (automatic takeover of extents, transfer of resulting value onto selected elements, etc.)

A U-value calculator has been loosely integrated.

Actually power density (entry of boundary condition) of a power source is used for evaluation. Provisioning of power density  in W/m³ can be easily derived from manufacturer's data.

Result reports for power sources display the power, power density and the volume (result report, probe points report).

In addition to absolute coordinate entry for elements (X1 to X2, Y1 to Y2, Z1 to Z2) relative thickness (dX, dY, dZ) can be entered.

Within surface editor and element editor characteristics of the surface (element type "Space") can be provided as  Alpha (surface transfer coefficient) or alternatively as Rs (transfer resistance).

Clipboard can be used to copy/cut/paste one or more selected elements. Clipboard can be used between projects or even separate program instances.

Drag-Drop of materials from the material list onto elelemts is supported now.

Prior to calculation start various validations are executed and, if data available is insufficient to start the computation error messages are shown - in addition or instead of those shown in solver window (e.g. (none or not enough space attachments, 0- or 1-dimensional construction, empty construction, etc.)

Further secondary functions (within Results3D) added: saturation vapor pressure distribution within the construction (hPa).

Features of the extended option „vapor diffusion“ have been integrated (partial pressure field, pressure difference field, vapor diffusion stream vector field).

Annotations of isolinies can be placed dense (proximity and step size shall be as small as 1mm from now on).

The  radius of the tube emphasizing selected isolines (Bold each-Nth) can be set to less then 1mm (even 0) too. Both adjustments together allow visualization of strongly magnified construction areas.


Interested? Contact us for more information.

Or try and evaluate the demonstrational version just now!

Wärmebrücken berechnen (AnTherm)
Psi-Wert Rechner
U-Wert Rechner
Luft-Hohlraum Rechner
Grenzfeuchte (Kondensfeuchte) Rechner
METEONORM - Klimadatenbank und Wettergenerator
Thermal Bridges Calculation (AnTherm)
Psi-Value Calculator
U-Value Calculator
Air Cavity Calculator
Condensing Humidity (dew point) Calculator
METEONORM - Climate- and Weather Generator
Mostki cieplne (AnTherm)
METEONORM - generator Klimatu i Pogody
CE Gefährdungsanalyse MaschCE
CE Hazard Analysis MaschCE
CE Analiza zagrozen MaschCE
SolRad3 Sonnenstrahlung
GEBA Gebäudesimulation
Bücher Bauphysik

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