Multiscale Daylight Modeling for Urban Environments

Literature review - Energy saving potential of user-centered integrated lighting solutions

“…The daylighting strategy employed in a particular building depends on the building's construction and functionality, as well as orientation, location (latitude), site and physical outdoor conditions. Many authors have discussed suitable methodologies for assessing this issue, both theoretically and through computer simulations (Littlefair, 1991(Littlefair, , 2001Compagnon, 2004;Dekay, 2010;Strømann-Andersen and Sattrup, 2011;Mardaljevic and Janes, 2013;Sattrup and Strømann-Andersen, 2013).…”

Sky vault partition for computing daylight availability and shortwave energy budget on an urban scale

“…With respect to the computation cost, it is generally accepted that a number of right-hand side columns reaching up to 10% of the number of variables is acceptable. Because the scope is here to solve hundreds of thousands of equations, 5 it is acceptable to manage tens of thousands of second members. To ensure the best outcome of this procedure, it is helpful to include the Sun in the sky discretization, which makes it necessary to think about the time step related to the representation of its trajectory and consequently to the level of refinement of the sky mesh.…”

“…Classical ray tracing programmes have also been used to analyse London or New York districts, demonstrating the capacity of present computer resources to address simulations with big three-dimensional models of several thousand elements. 5 The main concern of the present study is the presentation of a new partition of the sky vault. The presentation can then be focused on the radiosity method and, although it is not strictly required, limited to diffuse reflection.…”