Transient heat transfer through walls and thermal bridges. Numerical modelling: Methodology and validation

Abstract

The current advanced numerical codes for the energy audits carry out 0-dimensional simulation (i.e., one computational node representing the thermal zone), underestimating the effects of thermal bridges on the seasonal heating demand of buildings. The paper suggests a numerical resolution model, implemented in Matlab, aimed to be transferred in numerical engines for the hourly energy simulation. The proposed methodology solves common thermal bridges in buildings, evaluating their effects on the energy demand. Typical thermal bridges have been studied and implemented, analyzing the reliability of the methodology, in terms of accuracy, computational time, required sources, comparing the solutions with those derived by computational fluid dynamic codes. The method reveals very satisfactory results, both as regards the computational time and CPU sources required, as well as with reference to the reliability. Moreover, the solution stability is commonly very high, regardless the chosen computational time-step.

Thermal state analysis of energy saving structures of cast-in-place lightweight aggregate concrete walls

“…The research [10] provides analysis and development of a numerical model for simulation of unstable thermal behavior, both on the surface and in the corner joint of an external wall; consequently, this enables to define a building's demand in heating energy. Also, in 11 the authors present quantitative assessment of heat transfer through the external walls in the corner fragment.…”