2. DESCRIPTION OF THE SYSTEMS AND EVALUATION ENVIRONMENT
2.1 Prototype Setup
The systems were modelled using Desktop Radiance and functioned as the sole external wall of an office space with dimensions 800 (width) x 1200 (depth) x 270 (height) cm, with the reference workplane at 80 cm. This prototype corresponds to a deep office space typology, chosen to test the maximum reach of each system. Vertical height is assumed to be the third floor of an office building, placed around 10m over the ground which has a reflectance of 0.20.
The materials of the walls, ceiling and floor of this model take into account visual comfort and improved optical qualities with the following values [2] for reflectance = walls 0.65, carpet 0.20, and acoustic slab ceiling 0.80.
The geographical location is Tel Aviv, Israel (32N 35E, standard meridian 30E) due to its high concentration of office buildings, and the possibility of large energy savings through adequate distribution of available natural light [3].
2.2 Sizing and selection of the systems
The basecase system consists of a single view window made of clear double glazing and height 170 cm as shown in Fig. 1(a). It extends for the whole width of the prototype room and has a windowsill of 100cms.
The second system has the same characteristics as the basecase, except it is a lightshelf of highly reflective material (r = 0.80) which has been added