Conference Paper

Proceedings of Building Simulation 2019: 16th Conference of IBPSA

     

Improving FEM Computations For The Simulation Of Thermograms At The Urban Scale

José Pedro Aguerre 1, Raphael Nahon 2, Eduardo Fernández 1, Benoit Beckers 2
1 Universidad de la República, Uruguay
2 Université de Pau et des Pays de l'Adur

DOI: https://doi.org/10.26868/25222708.2019.210360
Abstract: Infrared cameras allow for the estimation of the temperature of urban surfaces. A time sequence of thermograms can be accurately simulated by computational techniques such as the finite element method (FEM) for transient heat transfer. The main objective of this work was to improve FEM convective and radiative boundary conditions, enabling a more precise analysis of an urban scene. The software Cast3m was used for performing the simulations, and the results were compared to a set of thermograms taken in the city of Bayonne through a clear-sky day. A street composed of two blocks was selected for the study, where the geometrical properties and boundary conditions were carefully established. The conducted experiments show that free internal air temperatures, rather than fixed, increase the realism of the simulation. Furthermore, the computational performance of the model was improved by exploiting specific properties of urban geometries.
Keywords: Urban Physics; Thermography; Finite Element Method; Numerical Simulation;
Pages: 3274 - 3281
Paper:

BS2019_210360