Suchergebnisse

Text en anglès i castellà. La consulta íntegra de la tesi, inclos l'article no comunicat públicament per drets d'autor, es pot realitzar prèvia petició a l'Arxiu de la UPC ; The overall aim of the thesis is to encourage the presence of sunlight into indoor spaces. The specific objective is to show that, from the lighting point of view, a good design can harness the solar reflection on the surfaces and increase the overall light level, without provoking the excessive contrast that causes glare. A literature review shows off the value of sunlight. The testimony of professional photographers describes its contribution to the visual interest. The scientific works stress the predilection that users feel in relation to the presence of sunlight, and inform about its healthy effects. People spend more and more time indoors and, therefore, require the introduction of sunlight. Ajourney through the history discovers the works and rules that are exemplary examples of good design. Nevertheless, the current legislation shows gaps when it only faces quantitative aspects (distribution of minimum light levels). The qualitative aspects (linked to the vision of light interest) should be part of the design more often. The challenge implies to be provided with tools to assess the balance of visible light into the spaces. The purpose of the glare formulations is to warn if a light contrast is excessive. The difficulty of its purpose is notable as it intends to assess the perceptive reaction of human vision, partially subjective. The attempts to validate a formulation are numerous. The thesis analyses eight indices of glare and chooses two to be included in an assessment methodology based on the reading of HDR images. The development of a script allows a data-processing succession, using the tools of Radiance, Webhdrtools and Evalglare. The methodology includes the assessment of the impact of different calibration parameters belonging to the camera (centre of bracketing) and those of the calculation instructions (calibration factor and threshold definition of glare source) to ensure the reliability of the calculations under sunlight conditions. The measurements were made in summer, at various scenarios located in two cities. In London, the first case considered a singular office lit thanks to roof and side windows (two façades). The outcome was compared with the perception of users with different nationalities and lighting cultures. Then, two meeting rooms permitted the assessment of the perception of a significant number of visual fields. The different orientation of the rooms (north and south) allowed the comparison of the effects of the solar presence inside or outside. In both cases, two variables were included: the window size and the contribution of the artificial light. In Barcelona, two other meeting rooms were studied, having both deeper solar penetrations due to the west orientation. This feature led to the consideration of the effects of several sunlight control devices: roller shutters, roller screens and vertical slats . Finally, in Barcelona, a final case served to judge a space under new conditions, characterized by an intermediate orientation (southwest) that, according to the time of day toggled the solar presence inside and outside, and a small window ratio in relation to the total facade. The results lead to specific conclusions depending on the type of solar penetration, due to the orientation, and the position that users occupy. Their joint contribution permits to suggest that the glare indexes rarely describe a disturbing or intolerable situation that would complicate a visual task. Therefore, except for the situations where the radiation falls on working surfaces, the design can incorporate the solar presence in the interiors in order to improve the lighting and thermal conditions. ; El objetivo general de la tesis es fomentar la presencia de la luz solar en los espacios interiores. El objetivo específico es demostrar que, desde el punto de vista lumínico, un buen diseño puede aprovechar la reflexión solar en las superficies y aumentar el nivel lumínico general sin que el contraste sea excesivo y cause deslumbramiento. Una revisión bibliográfica pone en valor la luz solar. El testimonio de fotógrafos profesionales describe su contribución en el interés visual. Los trabajos científicos destacan la predilección que sienten los usuarios por la presencia de la luz solar e informa de sus efectos saludables. Los individuos pasan cada vez más horas en espacios interiores y, por tanto, requieren la introducción de la luz solar. Un recorrido por la historia descubre obras y normas que son muestras ejemplares de buen diseño. Pese a ello, la legislación actual muestra carencias cuando únicamente afronta aspectos cuantitativos (reparto de niveles lumínicos mínimos). Los aspectos cualitativos (interés vinculado a la visión de la luz) deberían formar parte del diseño más a menudo. El reto implica dotarse de herramientas de evaluación del equilibrio de la luz visible en los espacios. El propósito de las fórmulas de deslumbramiento es advertir si un contraste lumínico es excesivo. La dificultad de su propósito es notable ya que pretenden evaluar la reacción perceptiva de la visión, parcialmente subjetiva. Las tentativas para validar una formulación son numerosas. La tesis analiza ocho índices de deslumbramiento y escoge dos para introducirlos en una metodología de evaluación basada en la lectura de imágenes HDR. El desarrollo de un script permite encadenar procedimientos informáticos que aprovechan herramientas de Radiance, Webhdrtool y Evalglare. La metodología incluye la valoración de la repercusión de diferentes parámetros de calibración propios de la cámara (centro del horquillado) y de las instrucciones de cálculo (factor de calibración y umbral de definición de la fuente deslumbramiento) para garantizar la fiabilidad de los cá lculos en condiciones de luz solar. Las mediciones sucedieron en verano, en escenarios diversos ubicados en dos ciudades. En Londres, el primer caso consideró una oficina singular, con luz cenital y lateral (dos fachadas). La obtención de resultados fue comparada con la percepción de unos usuarios de nacionalidades y culturas lumínicas distintas. A continuación, dos salas de reunión permitieron evaluar la percepción de un notable número de campos visuales. La distinta orientación de las salas (norte y sur) permitió comparar los efectos de la presencia solar en el interior o en el exterior. En ambos casos, dos variables fueron incorporadas: el tamaño de ventana y la contribución de la luz artificial. En Barcelona, dos otras salas de reunión fueron estudiadas, ambas con penetraciones solares más profundas a causa de la orientación oeste. Esta particularidad dio lugar a la consideración de los efectos de diferentes dispositivos de control de la luz solar: persianas o cortinas enrollables y lamas verticales. Finalmente, en Barcelona, un último caso sirvió para juzgar un espacio con condiciones distintas a las anteriores, caracterizado por una orientación intermedia (suroeste), que según la hora del día compaginaba la presencia solar en el interior y en el exterior, y por una proporción de ventana pequeña en relación a la totalidad de la fachada pequeña. Los resultados dan lugar a conclusiones específicas en función del tipo de penetración solar según las orientaciones y de la posición que ocupan los usuarios. Su contribución conjunta permite afirmar que los índices de deslumbramiento describen situaciones molestas o perturbadoras para una tarea visual en muy pocas ocasiones. Por tanto, exceptuando las situaciones en que la radiación incide sobre las superficies de trabajo, el diseño puede incorporar la presencia solar en los interiores con el fin de contribuir lumínicamente o térmicamente. ; Postprint (published version)

The overall aim of the thesis is to encourage the presence of sunlight into indoor spaces. The specific objective is to show that, from the lighting point of view, a good design can harness the solar reflection on the surfaces and increase the overall light level, without provoking the excessive contrast that causes glare. A literature review shows off the value of sunlight. The testimony of professional photographers describes its contribution to the visual interest. The scientific works stress the predilection that users feel in relation to the presence of sunlight, and inform about its healthy effects. People spend more and more time indoors and, therefore, require the introduction of sunlight. Ajourney through the history discovers the works and rules that are exemplary examples of good design. Nevertheless, the current legislation shows gaps when it only faces quantitative aspects (distribution of minimum light levels). The qualitative aspects (linked to the vision of light interest) should be part of the design more often. The challenge implies to be provided with tools to assess the balance of visible light into the spaces. The purpose of the glare formulations is to warn if a light contrast is excessive. The difficulty of its purpose is notable as it intends to assess the perceptive reaction of human vision, partially subjective. The attempts to validate a formulation are numerous. The thesis analyses eight indices of glare and chooses two to be included in an assessment methodology based on the reading of HDR images. The development of a script allows a data-processing succession, using the tools of Radiance, Webhdrtools and Evalglare. The methodology includes the assessment of the impact of different calibration parameters belonging to the camera (centre of bracketing) and those of the calculation instructions (calibration factor and threshold definition of glare source) to ensure the reliability of the calculations under sunlight conditions. The measurements were made in summer, at various scenarios ...

Text en anglès i castellà. La consulta íntegra de la tesi, inclos l'article no comunicat públicament per drets d'autor, es pot realitzar prèvia petició a l'Arxiu de la UPC ; The overall aim of the thesis is to encourage the presence of sunlight into indoor spaces. The specific objective is to show that, from the lighting point of view, a good design can harness the solar reflection on the surfaces and increase the overall light level, without provoking the excessive contrast that causes glare. A literature review shows off the value of sunlight. The testimony of professional photographers describes its contribution to the visual interest. The scientific works stress the predilection that users feel in relation to the presence of sunlight, and inform about its healthy effects. People spend more and more time indoors and, therefore, require the introduction of sunlight. Ajourney through the history discovers the works and rules that are exemplary examples of good design. Nevertheless, the current legislation shows gaps when it only faces quantitative aspects (distribution of minimum light levels). The qualitative aspects (linked to the vision of light interest) should be part of the design more often. The challenge implies to be provided with tools to assess the balance of visible light into the spaces. The purpose of the glare formulations is to warn if a light contrast is excessive. The difficulty of its purpose is notable as it intends to assess the perceptive reaction of human vision, partially subjective. The attempts to validate a formulation are numerous. The thesis analyses eight indices of glare and chooses two to be included in an assessment methodology based on the reading of HDR images. The development of a script allows a data-processing succession, using the tools of Radiance, Webhdrtools and Evalglare. The methodology includes the assessment of the impact of different calibration parameters belonging to the camera (centre of bracketing) and those of the calculation instructions (calibration factor ...