Integration of Thick Wall in TRNSYS Simulation
Abstract
TRNSYS is a software dedicated to the simulation of dynamic systems. Some obstacles have been encountered in the use of TRNSYS, particularly in the building model: the type 56, whose interface is TRNBuild. Thus, the integration of thick walls not associated with a correct choice of time steps can lead to miscalculations on the responses considered, this being caused by the wall model that considers the Z transform with limited number of terms. We have looked for a trick to resolve artificially a numerical problem. The aim of our study is the analysis of the inclusion of thick walls in TRNSYS. For that several alternatives were considered: divide the thick wall into two thinner walls separated by an empty hole, or play on different time steps used in TRNSYS to successfully calculate the transfer functions of these thick walls without sacrificing quality of results. Some tests have been made with a simplified building and the use of another software (CODYBA) to compare results. We after use the two methods to simulate a real ancient building (Valentino Castle).