Daylighting performance in light wells of residential buildings
DOI:
https://doi.org/10.24220/2318-0919v21e2024a5560Keywords:
Residential building, Urban legislation, Computational SimulationAbstract
The light well is an architectural solution used when there is no possibility of lightening naturally an internal environment from the external sides of the building. Different Brazilian cities allow its use based on a formula to calculate its geometry. This work aims to identify whether the minimum dimensions determined by the urban legislation of Juiz de Fora (Minas Gerais) for the light well are sufficient to guarantee adequate natural lighting in the internal environments connected to it. To this end, computer simulations of light wells in buildings models with 2, 4, 6 and 8 floors were carried out, using the Grasshopper and ClimateStudio programs, plug-ins of the Rhinoceros software. The lighting assessment metric used was Daylight Autonomy, which considers the mean percentage of occupancy hours throughout the year in which the sensors recorded illuminance equal to or greater than 150 lux. The results indicated that the current minimum areas indicated for satisfactory light in legislation do not allow environments to have adequate levels of illuminance. It can also be seen that the upper floors benefit from the increase in the diameter of the well; however, the increase in diameter is not enough to compensate for the loss of light due to the increase in the depth of the well. Results at different times of the solstices and the distribution of lighting in the environments are discussed. The study clearly indicates the need for a re-study of the city’s urban legislation.
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References
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