El Factor de Luz Diurna, Daylight Factor
, ha sido por anos una de las metricas mas usada a pesar de las limitaciones.
The results have indicated the minimum, average and maximum illuminance and daylight factor
in the high-rise residential building affected by building shading effect, whereas, 30m of building separation is the best distance between buildings in terms of planning to obtain the acceptable daylight and to enhance the daylight performance in the building.
Realistically, there is no uniform sky that is uniformly illuminated so that values of the percentage daylight factor
in building spaces can be directly measured.
3.2 The effect of light shelves on daylight factor
Below we present the daylight factor
and the daily total radiant energy of the courtyard space.
Calculation of daylight factor
DF [%] was carried out for the determination of an effect of three different types of window glasses on the indoor daylighting level in the investigated office.
The most commonly used metric for measuring daylight in a building is called the "daylight factor
"--expressed as a percent of available exterior daylight.
As an example, for London weather data with a daylight factor
of 3%, 250lux (23.2fc) would be exceeded for 75% of office hours (0900-1730) (CIBSE Guide A).
An ambitious aim was to make the classrooms fully daylit, but even a complete side wall of glass allows a daylight factor
only of 3.5 per cent at the back of the room.
Reductions in lighting consumption are awarded for increasing daylight factors
; a 20% reduction is available for a daylight factor
greater than 10%, a 10% reduction available for a factor greater than 5%, and a 5% reduction available for a factor greater than 2%.
This study examines the impacts of aperture size (daylight factor
) for four combinations of toplighting strategies and glazing types on the total yearly energy loads for a prototypical open office space situated in four different climates.
For the simulation of this new single zone atrium house, we used Autodesk Ecotect program to calculate the daylight factors
in the worst case condition (mid winter at noon) and chose a better fenestration design for the house.