Abstract

The blooming of a deep open plan in office buildings is accelerated due to economic profit reasons. This hinders the utilisation of daylight despite having abundance of daylight in tropical climate. Although a light pipe (LP) provides a means to illuminate the deep interior of the space, non-uniform daylight distribution still occurs due to the high illumination contrast across the room. The integration of a shading device (SD) in a room with an LP offers a solution to create a uniform daylight distribution. In this study, daylighting performances of 5 different types of an SD with different angles were analysed through a computer simulation software, namely Integrated Environment Solution Virtual Environment. The simulation was done using overcast and intermediate sky with sun conditions. The results showed that all SD cases improved the daylight uniformity across the room. A horizontal Venetian blind with an angle of +45o and −45o showed the best qualitative performance among all the cases. However, further shading and illumination are needed respectively to increase the potential daylight utilisation in an open plan office room. This study also concluded that a vertical Venetian blind did not provide a good daylight uniformity due to the vertical nature of the SD. A design recommendation guide for building designers is proposed at the end of this study to promote the integration of an SD and an LP in deep open plan high-rise office building.

Highlights

  • Daylight is known to have a positive physiological and psychological impact towards humans, especially office workers (Hamedani et al, 2019; Wirz-Justice et al, 2020)

  • The results showed that the shading device (SD) generally decreased both the minimum and the maximum daylight factor (DF)

  • The former ranged from −71.43% to −28.57% while the latter ranged from 9.29% to −69.65%

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Summary

Introduction

Daylight is known to have a positive physiological and psychological impact towards humans, especially office workers (Hamedani et al, 2019; Wirz-Justice et al, 2020). It creates a healthier environment and increases the productivity and reduces absenteeism. Previous research has shown the outdoor illuminance of tropical climate such as Malaysia to be more than 20,000 lx throughout the working hours of 09:00 and 17:00 (Lim, 2019; Heng et al, 2020) This offers an opportunity to harvest this renewable energy resource in the tropical region (Sharifah and Sia, 2004)

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