Collaboration of two Optical Daylighting Systems at Office Building in The Tropics

Elsiana, Feny and Soehartono, Frans and Kristanto, Luciana (2015) Collaboration of two Optical Daylighting Systems at Office Building in The Tropics. In: The International Joint Conference SENVAR-iNTA-AVAn 2015, 24-11-2015 - 24-11-2015, Johor - Malaysia.

Preview

PDF Download (1670Kb) | Preview

Abstract

Intensive use of air conditioning encourages building’s plan to be deep with a minimum surface to volume ratio. Modern air conditioned office building in the tropics are also applied external shading on windows or highly reflective glazing to minimize radiant heat gain. Those lead to the presence of areas that have insufficient daylight level at the work plane. Horizontal Light Pipe (HLP) is one of optical daylighting system that can guide daylight to these areas. Considering that distributing daylight evenly throughout room is important besides providing sufficient daylight level, a shading system, Reflective Louvre (RL) is applied. RL plays role in reducing daylight level at areas near to window and improving daylight uniformity inside room. The research’s aim is to evaluate and explain daylight quantity and distribution of HLP and RL at office space in the tropics. Experiment with physical model 1:10 was used as the research method. Illuminance was measured using HOBO U12/12 data logger, on a real sky condition. Comparison of illuminance, daylight ratio and uniformity ratio resulted by Base Case and HLP&RL Case, a typical office building with sidelighting and an office building with HLP and RL application sequentially, simultaneously with daylighting standards were conducted. Results showed that office room with HLP and RL application had a higher average illuminance and daylight ratio than Base Case. HLP and RL introduced consistently average illuminance between 400-900 lux, improved illuminance level at deep area of room as 160-290% and decreased illuminance level at area close to window as 8-60%. This combination created high uniformity ratio inside room, as high as 0.33-0.71. At most time, those illuminance value and uniformity ratio had fulfilled office’s daylighting standards.

Actions (login required)