AnTherm (Thermal Heat Bridges)
AnTherm (Analysis of Thermal behavior of Building
Construction Heat Bridges) is a powerful package of programs used for heat flow calculation
in building construction elements - the thermal bridges.
The program AnTherm allows calculation of:
2D and 3D - two and three dimensional
computing of Conductance Matrix Values (Leitwerte)
stationary (and soon instationary (periodic))
due point on the surface and inside of the construction
AnTherm is a powerful program package for the calculation of
temperature distributions and heat flows in building structures - particularly
such with thermal bridges. 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.
http://www.kornicki.de/antherm/EN/AnTherm.htm is fully dedicated to that
AnTherm analyses temperature conditions in building components in
which heat flows not just in one direction, but in two- and three-dimensional
patterns. This is of critical interest when evaluating the thermal performance -
an important design criteria - of so-called thermal bridges, that is, regions of
a building construction through which local peaks of heat loss can cause surface
temperatures to drop below the dewpoint. Thermal bridges are characterised by
multi-dimensional heat flow, and therefore by the fact that they cannot be
adequately approximated by the one-dimensional models of calculation typically
used in norms and standards for the thermal performance of buildings (U-values).
Surface moisture due to condensation (typically occurring in such regions as
floor-wall connections, window installations, etc.) as well as mould growth in
humid environments can also be effectively prevented by means of
multi-dimensional evaluation during planning and detail design.
European Standards (EN) pertaining to such aspects of thermal performance of
building constructions are already available . The ramifications of the adoption
of these European Standards is apparent: they describe the substance of new
tasks for designers, manufacturers, and builders, as well as their significance
for quality control in the field of energy conservation.
The purpose of the standard EN "Thermal Bridges - Calculation of Surface
Temperatures and Heat flows" is explicitly stated as:
- the calculation of minimum surface temperature in order to assess
the risk of surface condensation and
- the calculation of heat flows (for the constant flow case) in order
to predict overall heat loss from a building.
Furthermore, "high precision" methods of calculation are demanded, whereby
precision criteria which must be satisfied by the method chosen are defined in
The program AnTherm meets the demands of the European Standards with
respect to input data and - more importantly - output data requirements
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 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 analysed, 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 balancable 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.
AnTherm Website which is fully dedicated to that application.