Analysis of Thermal behaviour of
Building Constructions with
Heat and Vapour Bridges
AnTherm® is a powerful modern application
used for the "analysis of thermal behaviour of building components with heat
and vapour bridges". It calculates temperature distribution and
heat flows and/or vapour diffusion flows in building structures of
arbitrary form and complex material composition - particularly such with thermal
bridges. It presents critical condensing air humidity (dew point) at all
component's surfaces and shows the distribution of partial vapour pressure
in component's interior. This application is also suitable for analysing
dynamic behaviour of building components (for periodic, harmonic,
transient boundary conditions).
For the technically qualified designer, AnTherm is a reliable, indispensable
tool in meeting the demands of the current European standards (EN) for
evaluating thermal performance thoroughly and precisely.
In particular the program allows the calculation of:
steady state (stationary) and transient calculation of temperature distribution of components
two- and three dimensional
fully automatic calculation of
matrix of thermal coupling coefficients L2D
completely automated calculation of
linear thermal transmittance Ψ
transient periodic, harmonic calculation of
matrix of dynamic (harmonic) coupling coefficients (with the
fully automatic calculation of
weighting factors (fRsi, g) at coldest surface points of every spaces,
equally appropriate for very detailed modelling (e.g. facade
constructions, window frames, ...) and for very large calculation
cases (e.g. components at ground surface, complete spaces,
groups of spaces, ...) ,
calculation and presentation of critical condensing air humidity
(dew point) at all component's surfaces,
calculation and presentation of partial vapour pressure and, by
comparing it to the saturation pressure, simple identification of
condensation risk in component's interior (with the
dimensional graphical evaluation (visualization) also dynamically, under
time dependant, periodic boundary conditions.
AnTherm® - validated
according to EN ISO 10211: AnTherm has been qualified as a "Class A
precision tool" – as for two- and three-dimensional, steady state precision
method. It also fulfils all
requirements raised in EN ISO 10077 for the simulation program to qualify it
as standard method for calculation of heat flow through frames of windows, doors
• Table of contents •
• Copyright •
• License Terms and Conditions of Use •
• Validation according to EN ISO 10211:2007 •
• Validation according to EN ISO 10077-2:2003 •
• System requirements •
• Short reference •
• Installation of the software •
• Introduction •
• Country specific localisation •
• Starting AnTherm •
• Project types •
• Coordinate system •
• Results and Evaluation •
• Primary Concepts •
• Main application window •
• Editing windows (Input windows) •
• Evaluation & Results windows •
• Dialog windows •
• Further control elements •
• Working with files •
• Application Settings (dialog) •
• Theoretical background •
• Tutorials and Cookbooks •
• FAQ - Questions & Answers •
Daily experience gained so far by using the program AnTherm®
have impressively proven, that the input, calculation and the
evaluation part of the program satisfy highest
demands regarding highest complexity of calculated components.
Very high resolution (e.g. modelling at 1/10 mm ranges or less) as well as very
large models (e.g. complete building assemblies or components in contact with
ground) can be easily dealt with.
Major strengths of that software, like unlimited number of elements, easy to
control and flexible graphical evaluations even with very large computational
cases, direct calculation of thermal coupling coefficients and temperature weighting
factors, etc. have been implemented very carefully in AnTherm®.
Essential properties of the program
With respect to input data, AnTherm
- facilitates the generation of geometrical models by supporting a
graphic input display of building structures, as well as by providing an
entirely independent, fully automatic method of fine subdivision (which can
also be influenced by the user through manual manipulation of parameters).
- delivers complete input model documentation (geometry of material
elements, thermal design values of materials, spaces, heat sources...) upon
- allows the precision of numerical solutions to be influenced and
controlled by the user (definition of calculation parameters).
Evaluation results yielded by
AnTherm are conformant to European Standards and include:
- generally applicable results in the form of g-values and conductance
matrices. These conform to the temperature weighting factors and "thermal
coupling coefficients" defined in the European Standards, including the
required information on calculation precision.
- specific results, applicable to particular air temperature
conditions in spaces thermally coupled by the building components analyzed, in
the form of surface temperature minima and maxima as well as respective
- graphic plots and prints of isotherms, surface temperatures or
temperatures along an edge (2- or 3-dim. models), as well as heat flow
diagrams (not limited to 2-dim. models only, but also in 3D).
Furthermore, fully automatic execution of calculation with AnTherm is given
even in the event of poorly conditioned calculation cases. The maximum quantity
of balanceable cells is nearly unlimited (many millions), thus making the
thorough analysis of large, three-dimensional models feasible. Complex cases are
given, for example, by
- components or spaces in contact with ground.
- entire spatial envelopes or groups of spaces.
- detailed modelling of complicated assemblies (window frame and
installation details, steel structures, etc.).
The thermal performance of building assemblies with overall dimensions of up
to app. 100 m can be simulated with AnTherm.
Limitations to the scope of
evaluation depend on the PC hardware implemented.