Framtagning av nyckeltal för bestämning av dagsljusprestandan hos solskyddssystem för fasader

Sammanfattning: In this paper a method for evaluating the performance of sunshades and the controlling of the sunshades is presented. The method evaluates the sunshades in the perspective of the availability of useful daylight over the year in the room where the sunshades are installed. The metric is based on a climate based daylight metric called “Useful daylight illuminance” (UDI), which shows the fraction of the occupied time that the illuminance in one point is within a predefined illuminance interval. Furthermore the relation between the presented metric and the consumption of energy was investigated. The method is a result from a literature study. The literature used in the study mainly consists of articles on the subject daylight in buildings and daylight metrics. Two different sunshade technics was evaluated with the presented method, an electrochromic window and an external textile screen. The simulations were made in Rhino 6 and the levels of daylight were calculated with daylight coefficients. According to the results the electrochromic window had a better performance in both the availability of useful daylight and in the consumption of energy for heating and cooling the room.