Daylighting performance of toplighting systems in the hot and humid climate of Thailand Conference Paper uri icon


  • This paper presents the findings of a study that evaluated the daylight performance of three toplighting systems: skylights, lightscoops, and roof monitors for office buildings in Thailand. These toplighting systems were developed through a series of computer-assisted techniques and iteratively refined to respond to a wide range of solar positions. The daylight parameters evaluated were: daylight factor (DF), illuminance level, light distribution and uniformity. This study is part of a research project that examined both the daylighting and thermal performance of the three toplighting systems, which were designed to yield similar annual cooling loads. The daylighting performance evaluation was conducted using physical scale models and the RADIANCE lighting program; and the thermal performance of each system was evaluated using EnergyPlus. Comprehensive sets of computer simulation were used to simulate annual daylighting and energy performance. Results showed that the roof monitor with sun control devices provided the best daylight and thermal performance for a location like Bangkok, Thailand (latitude 13.7°N).

author list (cited authors)

  • Harntaweewongsa, S., & Beltrán, L. O.

publication date

  • December 2006