BRIGHTNESS PERFORMANCE OF OFFICE INTERIOR DUE TO ROOM’S WINDOW COMPONENTS CONFIGURATION

Asri Dinapradipta,Johanes Krisdianto

doi:10.9744/dimensi.44.2.129-136

Abstract

The paper reports room’s brightness performance of glass dominance office building facade in Jakarta due to the use of tinted and reflective type of glass wall and the combination of these with internal roller and venetian shading types. Method used to collect the data was mainly by direct measurements at three open-plan office buildings with different window components configurations under overcast sky condition, and at parallel sitting positions. Comparing the results of measurement with the standard of luminance value for office building was used as data analysis. Results show that the window components configuration influenced the luminance values of the interior and thus affected mostly on the brightness perception of the rooms. Both tinted and reflective glazing configured with roller blinds yielded accepted luminance value of rooms’ surfaces. They contributed to bright enough light perception of the rooms. On the other hand, the problem of room’s luminance values may occur with the use of reflective type of glass configured with the venetian blinds. The blinds exacerbated the daylight coming from window in which it resulted in significantly high average luminance value of the window.

Highlights

Recent decades have witnessed an increasing popularity for office buildings in hot humid tropics, with extremely large and wide, un-shaded glazed curtain walls and deep open spaces
Some cases showed that the solar-protective glazing technologies, which solved the problem of daylighting in subtropics or even cool climates, might introduce problems in humid tropical regions (Haase & Amato, 2006)
A study had indicated the importance of luminance distribution of surfaces within a space (Loe et al, 1994). They found that the available light affected the room’s surfaces luminance values in which at the end will influence the rating of lighting adequacy and comfort for working

Summary

Introduction

Recent decades have witnessed an increasing popularity for office buildings in hot humid tropics, with extremely large and wide, un-shaded glazed curtain walls and deep open spaces. Other researchers found that compared to the illuminance value, the room’s average surface luminance value was much more important to gain perceived visual/ lighting quality based on subjective room’s brightness assesment (Collins, 1994; Bulow-Hube, 2001). It reveals that the quality of light coming from the light sources has high contribution to the proper luminance value of the surfaces and affects the room’s brightness. The relevance to evaluate the window glass and its components is that because as a source of daylight, they contribute to harness the room’s brightness performance in which together with the illuminance, it dictates the overall room’s visual quality i.e overbright (tended to glary), bright, or gloomy

Objectives

Methods

Conclusion