Energy Efficient Fenestration for Daylighting Apptication in Thailand

Combinations of side-window parameters are proposed which produce less energy consumption in Thai commercial buildings. A generic reference building is generated by using DOE-2, a building energy simulation program,irsing Thailand's weather data. The base case of the office building model incliJes both the typical energy consumption characteristics and the daylight factor at various room depths. In the daylighting case, lighting integrated with stepped dimming devices is considered as an "n.rgy saving option compared with the conventional l ighting system. The daylighting application usin! steppeJ dimming devices is recommended to reduce artif icial l ighting energy and electricity "on.Iu*piion of the Thammasat hospital building. Results of parameterization study and combinations of window properties, window-to-wall ratios, and external shadings give recommendations for energy efficient fenestration design. Finally, daylighting application in the Thammasat hospital can reduce annual electricity consumf,tion by i.Z"l"*i7t', a payback period of 2.82years and an internal rate of return of 43.8o/o,revealinga high potential for daylight utilization in Thailand&apos