Abstract
The increasing attempt for energy saving in buildings needs the precise estimation of the thermal characteristics of buildings. In order to accomplish this goal, it is very important to conduct a transient thermal analysis of the building. However, the prior knowledge of the thermophysical properties of the building walls is essential to predict its thermal performance. Particularly when investigating existing and old buildings, for the case of renovation, wall materials and their thermal properties might be uncertain. To resolve this problem, the thermophysical properties are evaluated based on data obtained by in situ measurements of surface temperature and heat flux. Problems including complex geometries, which lead to thermal bridging effects, require more realistic, two or three-dimensional models to account for these effects. Therefore, the first objective of this study is to review the existing models available in the literature to investigate the thermal performance of buildings. The second objective is to present a numerical model for estimating the thermophysical properties of the building walls. The optimization process is integrated into the finite element analysis for solving one and two-dimensional coefficient inverse problems of heat transfer. The model is used to obtain the thermo-physical material properties of an equivalent wall, which provides a matching to the thermal flux behavior of an original multilayer wall under the same transient thermal boundary conditions and accounts for thermal bridges. The model presented in this investigation is considered promising to estimate the thermophysical properties of equivalent walls.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call