Method of the Finite Elements for the Calculation of the Dynamical Thermal Behavior of Walls, Rooms, or Buildings.

The author represents the trail solutions and the fundamentals of a mathematical model for the description of the nonsteady heat flows in multilayer walls using a method of the finite elements. The most important part of this report is devoted to the coupling of the simple singular solutions for the wall to the thermal system of the building. The internal boundary conditions and the various possibilities of the external boundary conditions, being necessary for the coupling, are stated. The window, as a transparent area being not able to store, is treated separately. Under the presumption, that the individual heat transfer resistances at the windowpanes and at the sunshades are known, a relatively comprehensive finite element model for the window is outlined.