Resumo

HERNANDEZ-GOMEZ, VH. et al. Analytical Model to Describe the Thermal Behavior of a Heat Discharge System in Roofs. Ing. invest. y tecnol. [online]. 2012, vol.13, n.1, pp.33-42. ISSN 2594-0732.

The present study proposes an analytical model which describes the thermal behavior of a heat discharge system in roof, when the surfaces that constitute it are not translucent. Such a model derives from a thermal balance carried out to a heat discharge system in roofs. To validate it, an experimental prototype that allows simulating the thermal behavior of a heat discharge system in wall and roof was used, and the results were compared to those obtained with the proposed analytical model. It was found that the thermal behavior of the analytical model is similar to the thermal behavior of the experimental prototype; a worthless variation was detected among their respective outcome (The difference of temperatures can be caused by the heat transfer coefficient, of which no studies defining its behavior accurately have been found). Therefore, it can be considered that the proposed analytical model can be employed to simulate the thermal behavior of a heat discharge system in roofs when the surfaces that constitute it are opaque.

Palavras-chave : passive system; roof shield; heat discharge system; natural ventilation; analytical model.

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