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Buildings 2017, 7(2), 30; doi:10.3390/buildings7020030

Energy and Economic Evaluation of Green Roofs for Residential Buildings in Hot-Humid Climates

1
Dammam Community College, King Fahd University of Petroleum and Minerals, KFUPM, Dhahran 31261, Saudi Arabia
2
Architectural Engineering Department, King Fahd University of Petroleum and Minerals, KFUPM, Dhahran 31261, Saudi Arabia
3
Architecture Department, King Fahd University of Petroleum and Minerals, KFUPM, Dhahran 31261, Saudi Arabia
*
Author to whom correspondence should be addressed.
Academic Editor: Francesco Guarino
Received: 1 December 2016 / Revised: 11 March 2017 / Accepted: 22 March 2017 / Published: 29 March 2017
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Abstract

Green roofs may be considered a passive energy saving technology that also offer benefits like environmental friendliness and enhancement of aesthetic and architectural qualities of buildings. This paper examines the energy and economic viability of the green roof technology in the hot humid climate of Saudi Arabia by considering a modern four bedroom residential building in the city of Dhahran as a case study. The base case and green roof modelling of the selected building has been developed with the help of DesignBuilder software. The base case model has been validated with the help of 3-month measured data about the energy consumption without a green roof installed. The result shows that the energy consumption for the base case is 169 kWh/m2 while the energy consumption due to the application of a green roof on the entire roof surface is 110 kWh/m2. For the three investigated green roof options, energy saving is found to be in the range of 24% to 35%. The economic evaluation based on the net present value (NPV) approach for 40 years with consideration to other environmental advantages indicates that the benefits of the green roof technology are realized towards the end of the life cycle of the building. View Full-Text
Keywords: green roof; buildings energy conservation; sustainability; energy-savings; net present value; hot humid climates green roof; buildings energy conservation; sustainability; energy-savings; net present value; hot humid climates
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mahmoud, A.S.; Asif, M.; Hassanain, M.A.; Babsail, M.O.; Sanni-Anibire, M.O. Energy and Economic Evaluation of Green Roofs for Residential Buildings in Hot-Humid Climates. Buildings 2017, 7, 30.

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