The poor environmental performance of offices behind the glass-box. Daylight and artificial light. In the office building of the glass box, a great part of the impinging solar radiation passes through the façade due to its transparency. In order to deal with the excessive lighting levels upon the work plan, various types of internal curtains are a necessity for the visual comfort of occupants, however, in many cases making the internal spaces darker, besides blocking views to the exterior. Coloured glass facades and, or reflective glass are even worse to the penetration of daylight, because they allow the incidence of the part of solar radiation associated exclusively with heat the long wavesat the same time that block a significative part of the solar radiation that creates daylight, again resulting in darker internal environments. It is worth mentioning that there are today available in the Brazilian market, internal blinds of the rolo type, that control the access of daylight without it blocking totally. However, from the thermal perspective, once the solar radiation goes through the glass, the cooling load will be the same as if there were no solar blinds at all. Technically, the use of external shading continues being the ideal solution for a better environmental performance not only from the point of view of thermal performance, but also for daylight, because it blocks the direct component of solar radiation the actual sunwhich brings glare risks, and also for moderating the penetration of diffuse light coming from the sky in the perimeter of the floor plans, around the facades. About the glass with milky aspect, as the so called U-glass that has recently reached the Brazilian Marketdue to the multiple layers of this type of glass component, the hypothesis for its performance would be of a good control of glare caused by the incident solar radiation, resulting in a homogenous daylight in the interior, however, with the implications of overheating that are related to the other types of double glazing mentioned in the previous texts of this series.
Dica de Caça-Níqueis #2: Fique de olho nas chances
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Dica de Caça-Níqueis #1: Conheça os seus limites e jogue dentro do seu orçamento
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