Functional Relationship Between Lighting Energy Consumption and the Main Parameters for Double Atrium Offices

Abstract In order to obtain as much sunlight as possible, architects are chiefly concerned with the design of atrium forms and sky roofs at the stage of schematic design, with the effort of using the daylighting area in the greatest extent. Compared with previous single atrium forms, this paper focuses on the daylighting effect on double atriums. Based on the four parameters of double atrium daylighting, which are spacing, shape, position and area distribution of atriums, this paper analyses the influences on the daylighting effect to the first and sixth floors with the use of simulation software DAYSIM and the investigation of 5 indices of the lighting consumption of working planes such as DA, UDI100-2000, UDI>2000 and lighting evenness. It was found that for most indices, changing the spacing of the atriums brings a clear U-shaped curve; rectangle atriums are superior to square atriums, but the specific conclusion regarding the orientation of rectangle atriums needs to exclude the influence of their spacing; changing the shape and position of atriums has little influence on their lighting energy consumption; in the middle area of atriums, covering less, lighting is better.