Tubular guidance systems for daylight: UK case studies

Tubular daylight guidance systems (TDGS) are linear devices that channel daylight into the core of a building. The experience of some of the first uses of TDGS is explored in actual buildings in UK temperate latitudes. The nature of the systems and the factors influencing the costs and various benefits that contribute value are identified. Lighting systems in working offices, lit by electric lighting and daylight guidance, were surveyed. Data on the physical characteristics of the systems, lighting conditions achieved, and user views were collected. The results formed the input to a cost and value analysis which permitted the economic limits of the systems to be evaluated. A number of daylight and environmental benefits were identified as value items, but the systems were clearly uneconomic in cost terms as presently configured and used. Long-term cost–value was compared with electric lighting alternatives making assumptions about future energy costs and system configurations. Some pitfalls of attempting to integrate innovative technology into existing lighting systems are identified and remedies suggested.

Les systèmes tubulaires de guidage de la lumière du jour (TDGS) sont des dispositifs linéaires qui canalisent la lumière du jour jusqu'au centre d'un bâtiment. L'auteur analyse quelques-unes des premières applications des TDGS dans des bâtiments existants au Royaume-Uni, sous des latitudes tempérées. Il identifie la nature des systèmes et les facteurs qui ont des incidences sur les coûts et les divers avantages qui contribuent à la valeur de ces systèmes. Il étudie les systèmes d'éclairage électrique et de guidage de la lumière du jour utilisés dans les bureaux. Il a recueilli des données sur les caractéristiques physiques de ces systèmes, sur les conditions d'éclairage obtenues et sur le point de vue des utilisateurs. Ces résultats ont servi à une analyse de coût et de valeur qui a permis d'évaluer les limites économiques de ces systèmes. On a identifié un certain nombre d'avantages de la lumière du jour et de l'environnement comme étant des éléments intéressants mais il est clair que ces systèmes ne sont pas rentables en termes de coût tel qu'ils sont actuellement configurés et utilisés. On a comparé l'ensemble coût-valeur à long terme à des alternatives d'éclairage électrique et élaboré des hypothèses sur l'avenir des coûts énergétiques et des configurations de tels systèmes. On a identifié quelques obstacles à l'intégration de technologies novatrices dans les systèmes d'éclairage existant et on a suggéré des solutions.

Mots clés: Mots-clés: technologies alternatives, lumière du jour, retour d'information, systèmes de guidage, conduits de lumière, systèmes d'éclairage, conception de bureaux, evaluation technologique, valeur     

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