Calculating the Heat Transfer of Wall Structures in Non-stationary Cases

In order to get an accurate knowledge of the energy consumption of buildings and ofcomfort parameters inside of closed rooms depending on the time, we developed amathematical model. Based on Fouriers differential equation, this mathematical modelallows us to calculate the instantaneous heat loss, the amount of the heat flow stored inthe wall between the two time values, and the plotting versus time of the temperaturegenerated on the contact surface of a double-layer wall structure. In addition to theoutside temperature, in the mathematical model we can take into account the radiationintensity reaching the external wall structures by way of sun radiation, as well as theplotting versus time of these meteorological characteristics. The boundary conditions ofthe developed equation system, which consists of 5 equations, can be determined on thebasis of meteorological databases or our own measurements.