Structure of the program
AnTherm is a package of numerous programs branches which are grouped and coordinated centrally. Although the program is composed of several modules (program branches), it can be operated as though it were one single program. This is made possible by the unified user interface which independently ensures proper sequencing through the chain of programs while thoroughly managing the various objects generated by individual branches of AnTherm.
The program can be divided into following branches:
The individual program branches are briefly described here.
The input branch supports the generation of a calculation data suitable for describing the object under consideration. The first stage of input entails generating a model of the object with respect to its geometry and the thermal properties of its materials together with the specification of attached spaces and their heat transfer coefficients. Optionally one can identify areas as heat sources which will supplying specified power to the model. Finally the the level of detail for the equation grid has to be specified, i.e. the subdivision of the model into fine network of grid elements required for the calculation. These pieces (rectangles or ashlars) of the network are later called "cells".
Having completed the input branch without errors the calculation branch can start with determination of "base solutions" - the basis of results. On top of that network a large system of linear equations is set up and solved iteratively. The number of equations in the system is equal to the number of cells in the orthogonal grid structure which it describes; thus a very finely gridded structure (calculation geometry) can result in lengthy computation.
Final output data is obtained in the evaluation branch, during which the model under consideration (or rather, its characterisation through base solutions) is evaluated under specific conditions. The boundary conditions which must be specified here include air temperatures for the spaces/cases calculated. In the event that heat source elements have been included in the model, power values must be assigned as a condition to these cases as well. Herein lies the advantage of the "detour" over base solutions, since these need be calculated only once for a given model. The calculation time required for subsequent evaluation of specific temperature distributions under alternate boundary conditions is thus substantially reduced by employing the base solutions which have been determined in the calculation branch - instead of repeating the entire analysis for each set of conditions. Numeric data is printed here in the final form of evaluation results.
Graphic representations of a given temperature distribution are generated in a form suitable for further evaluation. Within the graphical output of temperature distribution - like surface temperatures - one can false colour the temperature distribution or emphasize it by displaying isotherms also. Also images of streamlines or stream flux can be shown emphasizing the heat flow through the considered construction, often helpful in the identification of weaknesses of the construction.
If material properties of vapour transport have been supplied also partial vapour density and vapour flux can be calculated and evaluated here.
The evaluation branch provides printing of numerical results. Graphical results can be easily transferred to other applications for further processing.
See also: Input branch, Gridding, Calculation branch, Evaluation branch