Daylighting | Components of Daylight factor
Daylighting is the practice of the designing various types of openings to admit daylight into the working space for efficient and comfortable living. The orientation, shape and size of the openings play an important role in daylighting.
Daylighting could be provided with the help of windows, skylights, courtyards etc.
Daylight factor can be defined as the sum of all daylight reaching an indoor reference point.
The three important components considered for the estimation of total amount of daylight reaching a particular point is as follows:
- Direct light of the sun
- External surfaces reflecting light directly to the point
- Internal surfaces reflecting and interreflecting light to the point
Each of the three components when expressed as a ratio or percent of the simultaneous external illuminance defines the sky component (SC), external reflected component (ERC) and internal reflected component.