Climate-Based Daylight Modelling

CBDM05

Climate-Based Daylight Modelling (CBDM) refers to the simulation of annual daylight profiles within architecture, using 3D computer models in conjunction with the Perez all-weather sky model, Tregenza's daylight coefficients, EnergyPlus (.epw) climate data and specialist light simulation software such as AGI32, Radiance or Daysim.

Lighting Analysts are pioneering the use of these dynamic simulation methods to enable better understanding of the annual daylight illuminance profiles within buildings utilising a range of climate based metrics such as Daylight Autonomy (DA) and Useful Daylight Illuminance (UDI). This helps to better understand the complex nature of daylight through the year and helps to ensure optimal design is achieved and that maximum energy savings can be made through the use of daylight-linked lighting controls, as well as implementing shading strategies for the control of glare to ensure visual comfort for the occupants.

CBDM can also provide cumulative exposure data (kilolux/hours), which is essential when addressing spaces such as galleries and museums which house light sensitive artefacts.

Furthermore, CBDM can aid in the design and optimisation sport stadia, where optimal sunlight and daylight exposure, to the grass playing surface, is essential. Lighting Analysts have developed two new daylight metric, Climatic Daylight Exposure (CDE) & Climatic Daylight Factor (CDF%), which aid in the design, optimisation and comparison on different stadia designs.