Determination of transient two-dimensional heat transfer in ventilated lightweight low sloped roof using Fourier series

• Published in: Building and environment 2007-06, Vol.42 (6), p.2279-2288
• Main Authors: Černe, Boštjan, Medved, Sašo
• Format: Article
• Language: English
• Subjects: air flow; air temperature; Applied sciences; Building technical equipments; Buildings; Buildings. Public works; Computation methods. Tables. Charts; Environmental engineering; Exact sciences and technology; External envelopes; Fourier series; heat transfer; Lightweight roof; Mathematical models; Q1; Roof; Structural analysis. Stresses; thermal insulation; Two-dimensional heat transfer; Velocity; Ventilated cavity; Ventilation; Ventilation. Air conditioning
• ISSN: 0360-1323; 1873-684X
• DOI: 10.1016/j.buildenv.2006.04.022

In this paper, the analysis of transient two-dimensional (2D) heat transfer in low sloped roof with forced ventilated cavity made from lightweight building elements (LBE) is presented. For the heat transfer analysis the 2D numerical model, which was verified with experiments, was used. Forced ventilated cavity was configured in two different ways. In the first case the cavity was configured with coloured thin metal sheet and in the second case with thin metal sheet with added layer of thermal insulation and radiation barrier. Beside the influence of the ventilated cavity configuration on the transient 2D heat transfer in the LBE and on the cavity outlet air temperature also the influence of the LBE thickness, specific air flow rate through the cavity, inner air temperature and wind velocity was analysed. Multi-parametric equations for determination of Fourier series coefficients were formed. These coefficients were used for evaluation of transient 2D heat transfer on the inner side of the roof and cavity outlet air temperature for a clear day.