The doctoral thesis deals with a daylighting analysis of obstructed buildings in term of external obstacles location and the light reflectance of external surfaces. Static and dynamic daylight simulations were carried out using the software Daysim 3.1b. The doctoral thesis includes the validation of the software Daysim 3.1b for the daylight factor under the conditions of the CIE standard overcast sky model. The validation was performed using the Technical Report CIE 171: 2006, model measurements and in-situ measurements. For the comparative analysis of daylighting, a room obstructed by a row building, a continuous balcony and atrium walls was assumed. The external surfaces were designed with six light reflectance combinations. The daylight factor Dw on the window glazing from the external side and criteria determining the daylight amount inside the room were used for the daylighting analysis. The daylight amount is evaluated using the daylight factor under the CIE standard overcast sky model and using the daylight illuminance calculated based on the annual climate data for Prague. In the doctoral thesis, graphs and the regression models estimating the daylight factor Dw depending on an obstruction angle or a well index were built. Furthermore, regression models describing the relationship between the daylight factor and the daylight amount in the interior were also built. Based on the daylighting analysis of the obstructed buildings, three proposals to change the evaluation of the daylight accessibility on a façade were formulated.

Humans are less exposed to natural light during the day and less to darkness at night. Good daylighting provides visual comfort for performing tasks but also influences non-visual comfort. According to various studies, good daylight conditions can influence human physiology and behaviour, like sleep, alertness, mood and cognitive functions. Having good daylight conditions in our homes or student homes can be challenging, even more in Nordic countries. This research focuses on daylight in student dorms, located in Sweden. The influence of orientations and seasonality on daylight qualities is researched by using a survey with subjective evaluations and computer-simulated results. The survey and computer simulations show slight differences between the orientations for the existing situations in the student dorms. In summer and spring, daylight generally has more qualities than in winter and autumn, in some cases, glare can cause discomfort. Larger window dimensions result in more daylight entering future student homes. This improves the daylight conditions in winter and autumn, but east, south and west-facing rooms would benefit from shading to avoid potential glare. The amount of sky present in the outdoor view strongly influences the daylight qualities of a room.