Analysis of Visual Comfort and Circadian Stimulus Provided by Window Design in Educational Spaces

Abstract

Light is the main variable which affects to the circadian rhythm, promoting up to 70% of the melatonin suppression. In comparison with the visual system, the circadian system requires more light to be activated and is more sensitive to blue light. As can be deduced, daylighting represents an ideal light source for circadian entrainment. Architectural and design features, such as window size and room reflectance, impact the amount of circadian stimulus that occupants will receive. This study aims to quantify the circadian stimulus promoted in classrooms, according to the window size and reflectance of the surfaces. A first trial is carried out, monitoring the spectral power distribution perceived by the eyes of the students according to different orientations and observer's positions. Secondly, several simulations are developed, using the daylight simulation program DaySim 3.1 and defining a classroom model with a variable window size and reflectance. The results show the noticeable impact of the reflectance of the inner surfaces in the circadian stimulus calculation, as well as the effect of the window size.

Natural Lighting in Historic Houses during Times of Pandemic. The Case of Housing in the Mediterranean Climate

“…As a specific objective, it was proposed to determine the most appropriate design and type of opening for these requirements, as well as the area of the plans that can usually be occupied and where natural lighting is adequate for work tasks. At present, we only find this type of study for health [ 38 ], educational, or office [ 39 ] spaces and linked to standard or horizontal window openings. According to the results obtained, the absence of horizontal windows and the availability of patios or terraces result in the highest incidence for potentially experiencing some type of disorder due to the lack of lighting.…”

Subjective Assessment of Light Environment Quality based on Human-centric Lighting

“…A good light environment has a positive relationship with human performance [1][2][3][4][5], human well-being [6][7][8][9][10] and human behavior [11]. Various positive effects of the light environment on space can be achieved by creating a good quality light environment.…”

Optimization of Window Design in Hospital Rooms for Effective Access to Daylight

“…Traditionally, the sizing of windows in architecture was mainly driven for aesthetic considerations, disregarding quantitative criteria for optimization and energy use. However, advancements in calculation methods and the introduction of novel dynamic metrics for natural lighting have paved the way [20,21], in recent years, a new way for enhancing window design [16], [22,23] and lighting control strategies [21], [23][24][25][26][27][28][29].…”