This paper illustrates a numerical investigation on a prototypal ventilated roof for residential use. The analysis is carried out on a two-dimensional model in air flow and the governing equations are given in terms of k-ε turbulence model. Due the symmetry geometric and thermal has been studied a single flap of the roof. The analysis is performed in order to evaluate the thermofluidodynamic behavior of the roof as a function of geometric parameters such as the inclination, the layer of ventilation gap and the hipped roof height. The problem is solved by means of the commercial code Ansys-Fluent and the results are performed for assigned wall heat flux on the top wall. Results are given in terms of wall temperature distributions, air velocity, temperature profiles along the cross sections of the roof to estimate the differences among the various configurations. Further, the ventilated roof is compared with other types of roof.

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