Estudio comparativo del efecto de las propiedades ópticas del revestimiento exterior de fachada sobre la demanda energética de un edificio

Abstract

 With the aim of improving the building energy efficiency,
different technologies have been developed that optimize the
use of solar energy in building envelope and avoid warming of
urban areas. Chromogenic devices based on materials whose
optical properties can be reversibly modified by an external
stimulus have become relevant among these technologies.
The façade coating can have different types of texture or
color that determine specific optical properties, including
absorptance, which defines the amount of solar radiation
absorbed by the material with respect to the incident radiation.
In the present work , the influence of the optical properties
of two types of exterior façade coatings on the building
energy demand is analysed: a belitic cement synthesized in
the laboratory through a low energy and low CO2 emissions
process and a brick representative of a typical building
masonry, presenting the former a more polished surface and
lighter color than the latter.
This study has focused on determining the parameters that
optimize the use of the optical properties of the studied
coatings in the building energy efficiency. The results show
that the N-S orientation and the uninsulated wall suppose
greater impacts on the energy demand by the coating change.
In turn, the effect of coating change is remarkable in the
climates studied, but it is in the temperate A3 climate where
lower demands are achieved, approaching those established for
passive buildings.
These parameters will be used for future studies with a new
thermochromic mortar coating developed from belitic cement,
analyzing its influence on the building energy demand.