Paper Conference

Proceedings of eSim 2012: 7th Conference of IBPSA-Canada


Thermal modeling for ventilated structural components using frequency response and finite difference methods and comparison with experimental data

Yuxiang Chen, A. Athienitis, Khaled Galal

Abstract: Ventilated structural components, such as ventilated concrete slabs (VCS) and ventilated masonry block walls can be used to actively store and release thermal energy by passing air through their air channels. In this paper, lumped-parameter thermal models of ventilated structural components are presented. The modeling methods include frequency response and explicit finite difference. Equations for calculating the mean temperature of the air flow are provided. In the frequency response approach, discrete Fourier series in complex frequency form are used to model the boundary excitations, such as the surface temperature variation and heat flux from air flow. In the treatment of air flow, including the activation of air flow based on VCS temperature and its heat injection as internal source in the VCS, thermal network techniques such as Thévenin theorem and Ydiakoptic transform are applied. In explicit finite difference approach, the thermal behavior modeled by multi-layer dense discretization scheme is compared with that by 2-layer and 3-layer schemes. The simulation results from frequency response and explicit finite difference approaches, the comparison between them, and the comparison with experimental data are presented.
Pages: 338 - 351