Influencia del acristalamiento sobre los parámetros y la calificación energética de acuerdo con la orientación del edificio y los porcentajes de aberturas de fachada = The influence of glazing over the parameters and energy rating according to the buildin

It is well known the significant impact of glazing over the building energy demand making it the thermal envelope’s most important part. A study of the influence of thermal transmittance (U-factor) and solar factor (g-value) of three different glazing types over the parameters and energy rating are shown in this paper. A single-family dwelling located in Seville city, Spain, has been analyzed to which a set of hypotheses, six opening percentages ranging from 10 to 60% considered by the Spanish Building Code on its simplified option, and different combinations, four orientations matching the cardinal directions, has been applied. For the climate zone and glazing types considered, the g-value parameter has a higher incidence on the global demand and energy rating than thermal transmittance. It is established which orientation greater energy savings can be achieved independently for heating, cooling demand and energy rating. Also the ideal values for both parameters that should be considered in each orientation in order to improve the energy rating. Therefore, when selecting a type of glazing it would be important to consider the best “U” and “g” parameter values together for each orientation in order to get the lowest energy demand possible.