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Moreno, D.; Esquivias, P.M.; Fernández-Expósito, M. (2015, 14 de diciembre). Luminous and thermal impact of fixed solar shadings devices.

CONGRESO: Book of Abstracts of the III International Congress on Construction and Building Research

PÁGINAS: 188-189

CIUDAD: Madrid (España)

ABSTRACT:

Although the most visible aspect of Directive 2010/31/UE has been an upsurge in requirements for thermal insulation in buildings, due to a rise in the number of air-conditioning systems in European countries, the Council of the European Union gives priority to strategies which enhance the thermal performance of buildings during the summer period, especially those which avoid overheating, such as shading devices.

Those measures should take into account climatic and local conditions. Without doubt, countries with warm climates have a large constructive tradition in avoiding excessive solar thermal radiation into their buildings. But the importation of architecture from the northern Europe, where local climatic conditions and daylight requirements based on the Daylight Factor metric provide buildings with large glazed surfaces, having very important problems of glare and overheating, especially in sunny climates.

To fix these problems, movable solar shading devices at the inner side of glazing s is widespread. However solar thermal radiation is not avoided to enter. In addition, usually these devices are not well used and a common scenario is having the blinds closed and the electric light on, increasing, of course, the energy consumption in both thermal and lighting active systems.

The goal of making good use of daylight provision however needs to be tempered by the need to prevent the undue occurrence of very high levels of daylight illuminance since these are associated both with visual discomfort and the likelihood of excessive solar gain (i.e. increased cooling loads).