Impacto de las propiedades superficiales de una cubierta sobre el desempeño térmico interior. Análisis descriptivo sobre un local comercial de gran superficie en tres ciudades colombianas

Abstract

Knowledge of surface properties is very important to define passive cooling strategies and thermal performance in indoor environments. In order to identify the impact that these properties have on these aspects, methodologies were investigated that would allow them to be measured in the tropical region. In the scientific literature, the transmittance and thermal resistance of the materials used in the envelope are the best-known parameters to evaluate its thermal performance. These are recommended by current regulations in our country to achieve good thermal performance in the design of buildings with high energy efficiency. However, it is discovered that the surface properties such as emittance (ε) and absorptance (α) of the envelopes exposed to climatic factors have recently acquired relevance in the evaluation of interior thermal performance, due to their impact on the interior surface temperature of the roof and, consequently, on the average radiant temperature inside the building. Methods were found that allowed evaluating the thermal performance on a hypothetical model by parameterizing surface properties in four types of roof. The indicators used under the TPI and °C/h methodology were applied to simulate the thermal performance in three climatic zones of Colombia. The results are exposed through tables and scatter plots comparing the surface temperature of covers with emittance (ε) 0.3 and (ε) 0.9 at various levels of absorptance (α). It is observed that the assignment of values ​​to these properties, in the incorporation of passive cooling strategies, should not be generalized in a context characterized by climatic diversity, as it is in our region.

Keywords:

bioclimatic architecture comfort construction material roof temperature

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