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Air Conditioning Energy Saving by Rooftop Greenery System in Subtropical Climate in Australia

Authors: M. Anwar, M. G. Rasul, M. M. K. Khan


The benefits of rooftop greenery systems (such as energy savings, reduction of greenhouse gas emission for mitigating climate change and maintaining sustainable development, indoor temperature control etc.) in buildings are well recognized, however there remains very little research conducted for quantifying the benefits in subtropical climates such as in Australia. This study mainly focuses on measuring/determining temperature profile and air conditioning energy savings by implementing rooftop greenery systems in subtropical Central Queensland in Australia. An experimental set-up was installed at Rockhampton campus of Central Queensland University, where two standard shipping containers (6m x 2.4m x 2.4m) were converted into small offices, one with green roof and one without. These were used for temperature, humidity and energy consumption data collection. The study found that an energy savings of up to 11.70% and temperature difference of up to 4°C can be achieved in March in subtropical Central Queensland climate in Australia. It is expected that more energy can be saved in peak summer days (December/February) as temperature difference between green roof and non-green roof is higher in December- February.

Keywords: subtropical climate, shipping container, Extensive green roof, Rooftop greenery system

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[1] Buildings (2013) retrieved from what-you-need-to-know/buildings.aspx accessed on April 20, 201.
[2] Energy in Australia 2012, Department of Resources Energy and Tourism, available from
[3] T. Markis, J.A. Paravantis, Energy Conservation in small enterprises, Energy and Buildings 39, 2007, pp. 404-415.
[4] M.M. Rahman, M.G. Rasul and M.M.K. Khan (2008), Energy Conservation Measures in an Institutional Building by Dynamic Simulation Using DesignBuilder, Proceedings of the 3rd IASME/WSEAS International Conference on Energy & Environment (EE‘08), Paper Number: 565-266, pp. 192-197, University of Cambridge, Cambridge, UK, February 23-25.
[5] J.A. Clarke, Assessing Building Performance by Simulation, Building and Environment 28, 1993, pp. 419-427.
[6] T. Emilsson, Vegetation development on extensive vegetated green roofs: Influence of substrate composition, establishment method and species mix. Ecol. Eng. 33, 2008, pp. 265-277.
[7] J. Mentens, D.Raes, M.Hermy, Green roofs as a tool for solving the rainwater runoff problem in the urbanized 21st century? Landscape and Urban Planning 77 (3), 2006, pp. 217-226.
[8] E. Ekaterini, A.Dimitris, The contribution of a planted roof to the thermal protection of buildings in Greece, Energy and Buildings 27(3), 1998, pp. 29-36.
[9] E.P. Del Barrio, Analysis of the green roofs cooling potential in buildings, Energy and Buildings 27, 1998, pp. 179–19.
[10] ZinCo GMBH, Green Roofs: Recommended Standards for Designing and Installation on Roofs, 6th edition, Zinco GmbH, Germany, 2000.
[11] Bureau of Meteorology, (BOM), Australia, Climate data online retrieved from
[12] Climate data online retrieved from http://www.rockhampton.
[13] M. Anwar, M.G. Rasul and M.M.K. Khan (2013), Thermal Performance Analysis of Rooftop Greenery System in subtropical climate of Australia, 7th WSEAS International Conference on Renewable Energy Sources 2013, April 2-4, 2013, Kuala Lumpur, Malaysia.
[14] N.S.G. Williams, J.P.Rayner, Green roofs for a wide brown land: Opportunities and barriers for rooftop greening in Australia. Urban Forestry & Urban Greening 9, 2010, pp. 245-251.
[15] Elmich, Sustainable eco-friendly landscapes and architectural products, 2013, available from
[16] N.H. Wong, Y. Chen, C.L.Ong, A.Sia, Investigation of thermal benefits of rooftop garden in the tropical environment. Build. Environ. 38, 2003, pp. 261–270.
[17] DesignBuilderDocumentation. (2012), DesignBuilderUser Manual, Version 3.0. UK:DesignBuilder Software Limited.