NUEVA MÉTRICA DINÁMICA DE LUZ NATURAL: RELACIÓN ENTRE LA PERCEPCIÓN DE SUFICIENCIA LUMÍNICA Y LA DISPONIBILIDAD LUMÍNICA EXTERIOR
Creators: name: Arango-Díaz, Lucas
Publisher: name: figshare
Year: 2022
Subjects: subject: 120101 Architectural Design
subject: FOS: Arts (arts, history of arts, performing arts, music)
subject: 120202 Building Science and Techniques
subject: FOS: Civil engineering
subject: 120104 Architectural Science and Technology (incl. Acoustics, Lighting, Structure and Ecologically Sustainable Design)

description: The correct use of daylight in indoor environments refers to the ability to guarantee, with diffuse daylight, sufficient light levels according to the visual task to be performed while minimizing the daylight glare probability. Historically, sufficient daylight levels for each visual task have been object of study. Currently, for example, the International Organization Standardization-ISO and International Commission on Illumination-CIE establish that, for classrooms, adequate or sufficient light levels range between 300 lux and 500 lux. Although these levels are commonly accepted by various researchers for typical reading or writing activities and are used in the most common Climate Based Daylight Modelling – CBDM Metrics, other authors highlight the existence of differences in the assessment of daylight levels based on the perception of people, that is, daylight levels lower or higher than those referenced are also perceived as sufficient by a considerable proportion of the population. This research started from the hypothesis that these differences in horizontal illuminances perceived as sufficient in naturally illuminated interior environments are associated with the availability of exterior daylight, that is, a certain daylight level is perceived as insufficient, excessive or sufficient, also because of the amount of available daylight in each geographic location. The objective of this research was to develop a dynamic daylight metric with a reference illuminance calculated from the consideration of the differences in the perception of daylight sufficiency according to the availability of exterior daylight. To achieve this objective, a methodology was proposed with which, based on surveys and measurements, differences in the proportion of people who perceived certain daylight levels as not dark in different cities of Colombia and Chile were evidenced. These differences were associated with local daylight availability and, using a logistic regression, it was developed a model to predict, with 68.9% accuracy, the probability that a person in a certain geographic location located in the tropics would assess certain daylight level as not dark. Using these models, a new dynamic metric, called daDA - Daylighy Autonomy associated with outdoor daylight availability, was proposed. In this metric the reference illuminance is estimated so that at least 80% of the people in a given geographic location perceive the daylight level as not dark for a percentage of time per year. The metric was applied through computer simulation in a hypothetical classroom and the results were compared with those of the application of traditional dynamic metrics. The results show great differences in the valuation of environments when one metric is used or another. Therefore, the research concluded that it is possible to predict, with a certain level of precision, the daylight perception of people from a certain geographical location. It was also concluded that its consideration in the formulation of a dynamic metric is feasible to predict, more accurately, the valuation that an interior space would have based on people's perception.