Energy saving potential and visual comfort of task light usage for offices in Malaysia

Abstract In the wake of the recent green building aspiration in Malaysia, this article explores the energy saving potential and user behaviour towards task lights in two office spaces in Malaysia; one is daylight assisted, and another is the conventional design of full reliance on the overhead electrical light. The lighting usage patterns were monitored with 5 min interval over a month’s period during office working hours. Task lights with 8W CFL daylight bulbs were provided after the initial two weeks of measuring period and comparison of lighting power density LPD (W/m2) was made. 15 samples of each office space were given visual comfort survey before and after the task lights were distributed to each’s workspace. The result reveals that the addition of task lights only contributes to 0.60 W/m2 of LPD. It further concludes the operational LPD of the daylight assisted with task light equipped office space achieves 78% of lighting energy saving (3.04 W/m2) when compared to the recommended base case of MS1525:2014 (14.00 W/m2). It also reveals that the provision of task light will not necessarily improve the current LPD if the lighting control system is not responsive to it to create the desirable luminous environment. Interestingly, both offices’ occupants show significant improvement in evaluating their satisfaction towards paperwork brightness and colour rendering with the usage of task light. However, this does not apply to computer work. There is no correlation established between the usage rate of task light and the distance of workspace from the nearest window.

[1]  Mbc Myriam Aries,et al.  Individual control of electric lighting in a daylit space , 2008 .

[2]  Ingrid Heynderickx,et al.  The relation between comfortable lighting and perceived glare , 2014 .

[3]  Xia Cao,et al.  Climate change and energy development: implications for developing countries , 2003 .

[4]  P. Vink,et al.  Pleasure, Arousal, Dominance: Mehrabian and Russell revisited , 2014, Current Psychology.

[5]  Tariq Muneer,et al.  Natural light controls and guides in buildings. Energy saving for electrical lighting, reduction of cooling load , 2015 .

[6]  Simon H. A. Begemann,et al.  Daylight, artificial light and people in an office environment, overview of visual and biological responses , 1997 .

[7]  Rahman Saidur,et al.  Energy consumption, energy savings, and emission analysis in Malaysian office buildings , 2009 .

[8]  Danny H.W. Li,et al.  Evaluation of lighting performance in office buildings with daylighting controls , 2001 .

[9]  Moncef Krarti,et al.  Estimation of lighting energy savings from daylighting , 2009 .

[10]  Mastor Surat,et al.  An Analysis of Variation of Ceiling Height and Window Level for Studio Architecture in Malaysia , 2012 .

[11]  M. A. Alghoul,et al.  Research and development on aspects of daylighting fundamentals , 2013 .

[12]  Anca D. Galasiu,et al.  Energy Saving Lighting Control Systems for Open-Plan Offices: A Field Study , 2007 .

[13]  Chia-Yen Lee,et al.  Optimal sun-shading design for enhanced daylight illumination of subtropical classrooms , 2008 .

[14]  Mohd Hamdan Ahmad,et al.  Daylighting as a sustainable approach for high-rise office in tropics , 2012 .

[15]  Anca D. Galasiu,et al.  Impact of window blinds on daylight-linked dimming and automatic on/off lighting controls , 2004 .

[16]  Mark S. Rea,et al.  Occupant Use of Manual Lighting Controls in Private Offices , 1999 .

[17]  Francis Rubinstein,et al.  Comparison of control options in private offices in an advanced lighting controls testbed , 1999 .

[18]  Clarence E. Waters,et al.  VCP and UGR Glare Evaluation Systems: A Look Back and a Way Forward , 2005 .

[19]  I. Knez,et al.  Effects of Indoor Lighting, Gender, and Age on Mood and Cognitive Performance , 2000 .

[20]  A. Mohamed,et al.  A comparative study on the energy policies in Japan and Malaysia in fulfilling their nations’ obligations towards the Kyoto Protocol , 2009 .

[21]  Michael Siminovitch,et al.  Integrated lighting approach saves energy in post office facilities , 2000 .

[22]  Stanislav Darula,et al.  Luminous effectiveness of tubular light-guides in tropics , 2010 .

[23]  Nazanin Nasrollahi,et al.  Daylight illuminance in urban environments for visual comfort and energy performance , 2016 .

[24]  Zulkhairi Zainol Abidin,et al.  The availability of daylight from tropical skies: a case study of Malaysia , 2002 .

[25]  Dl Loe.  Energy efficiency in lighting — considerations and possibilities , 2009 .

[26]  M. Rashid,et al.  A Review of the Empirical Literature on the Relationships Between Indoor Environment and Stress in Health Care and Office Settings , 2008 .

[27]  Ann R. Webb,et al.  Considerations for lighting in the built environment: Non-visual effects of light , 2006 .

[28]  Leah Zagreus,et al.  Occupant satisfaction with indoor environmental quality in green buildings , 2006 .

[29]  Jean-Louis Scartezzini,et al.  Minimizing lighting power density in office rooms equipped with Anidolic Daylighting Systems , 2010 .

[30]  I. Budaiwi,et al.  Energy performance of windows in office buildings considering daylight integration and visual comfort in hot climates , 2015 .

[31]  Francesca Fragliasso,et al.  Why are daylight-linked controls (DLCs) not so spread? A literature review , 2016 .

[32]  Sergio Altomonte,et al.  Daylight for Energy Savings and Psycho-Physiological Well-Being in Sustainable Built Environments , 2009 .

[33]  N. Khan,et al.  Comparative study of energy saving light sources , 2011 .

[34]  Anca D. Galasiu,et al.  Occupant preferences and satisfaction with the luminous environment and control systems in daylit offices: a literature review , 2006 .

[35]  Luis Pérez-Lombard,et al.  A review on buildings energy consumption information , 2008 .

[36]  M Fontoynont,et al.  Analytical tests for investigating the accuracy of lighting programs , 2003 .

[37]  Angelo Cenedese,et al.  Personal lighting control with occupancy and daylight adaptation , 2015 .

[38]  Danny H.W. Li,et al.  An analysis of daylighting performance for office buildings in Hong Kong , 2008 .

[39]  Lukas H. Meyer,et al.  Summary for policymakers , 2007 .

[40]  Jennifer A. Veitch,et al.  Preferred luminous conditions in open-plan offices: research and practice recommendations , 2000 .

[41]  Hasanuddin Lamit,et al.  User satisfaction adaptive behaviors for assessing energy efficient building indoor cooling and lighting environment , 2014 .

[42]  Mariska G. M. Stokkermans,et al.  Linking Lighting Appraisals to Work Behaviors , 2013 .

[43]  Alice M. Agogino,et al.  Personalized dynamic design of networked lighting for energy-efficiency in open-plan offices , 2011 .

[44]  J. Veitch.  Psychological Processes Influencing Lighting Quality , 2001 .

[45]  G. Newsham,et al.  Windows, view, and office characteristics predict physical and psychological discomfort , 2010 .

[46]  Michael Hirning,et al.  Practicality and Performance of Daylight Trough in The Tropics: A Case Study , 2016 .

[47]  Sreenivasaiah Purushothama Rao,et al.  Parametric Studies on Window-To-Wall Ratio for Day lighting Optimisation in High-Rise Office Buildings in Kuala Lumpur, Malaysia , 2013 .

[48]  H. Djamila,et al.  Estimation of exterior vertical daylight for the humid tropic of Kota Kinabalu city in East Malaysia , 2011 .

[49]  Yuehong Su,et al.  Daylight availability assessment and its potential energy saving estimation –A literature review , 2015 .

[50]  H. Hellinga.  Daylight and View: The Influence of Windows on the Visual Quality of Indoor Spaces , 2013 .

[51]  Jennifer A. Veitch,et al.  Task Lighting Effects on Office Worker Satisfaction and Performance, and Energy Efficiency , 2005 .

[52]  Önder Güler,et al.  Determination of the energy saving by daylight responsive lighting control systems with an example from Istanbul , 2003 .

[53]  Peter Boyce,et al.  Occupant use of switching and dimming controls in offices , 2006 .

[54]  L.F.M. Kuijt-Evers,et al.  Personal environmental control: Effects of pre-set conditions for heating and lighting on personal settings, task performance and comfort experience , 2015 .

[55]  Yuehong Su,et al.  Application of RELUX simulation to investigate energy saving potential from daylighting in a new educational building in UK , 2014 .

[56]  Veronica Garcia-Hansen,et al.  Prediction of discomfort glare from windows under tropical skies , 2017 .

[57]  J. Iwaro,et al.  A review of building energy regulation and policy for energy conservation in developing countries , 2010 .

[58]  DJ Carter,et al.  A feasibility study for hybrid lighting systems , 2012 .

[59]  Åke Blomsterberg,et al.  Energy saving potential and strategies for electric lighting in future North European, low energy office buildings: A literature review , 2011 .

[60]  Peter Boyce,et al.  Lighting quality and office work: two field simulation experiments , 2006 .