Quick Determination of Daylight and Irradince in a room with lightshelf and its applications to a hot humid climate

The aim of this work is to present a simulation programme for PCs which is easy to use and yields quick results of daylighting along the day in an indoor environment provided with a lightshelf, and solar irradiation levels on the external faade of a building. The programme was developed aiming simulations for hot humid climate conditions. The calculations are performed under three sky conditions for a selected site, albedo, surface orientation and inclination, window and lightshelf characteristics, room dimensions and wall surface reflectances. A case study is presented for the Rio de Janeiro city, where the performance of a lightshelf is determined in order to reduce glare and solar gain near the window, and to increase natural lighting at the rear of the room.