Abstract
By incorporating a Diffuser around the rotor to form a Diffuser Augmented Wind Turbine (DAWT), a conventional wind turbines’ performance can be significantly improved. The diffuser is able to funnel and accelerate incident air flow to the rotor thereby driving it for a higher power extraction threshold for better control and continuous periods of operation. A steady-state Computational Fluid Dynamics (CFD) study was carried out in ANSYS Fluent on a three-bladed roof-mounted DAWT on a section of the Heriot-Watt University building located in Dubai, UAE. The results displayed that the diffuser significantly improved performance on the equivalent bare wind turbine used as a baseline model. The DAWT outperformed the Horizontal Axis Wind Turbine (HAWT) with Concentrator as it induced the largest pressure drop across the rotor and the largest wind speed. The results show improved aerodynamic capabilities as wind speeds were significantly increased and better distributed across the rotor in the DAWT; it achieved a 53.8% increase in wind speed compared to the benchmark HAWT (bare wind turbine) which had 0.6 m/s at rotor. The HAWT w. Concentrator achieved a 35.1% increase on the benchmark. The maximum power augmentation achieved was 2.5 at speed of 1.3 m/s at the rotor for the DAWT. The results agree well with the work of Ohya and Karasudani (2010) where they achieved augmentation ratios between 2 and 5 and the work of Wang and Chen (2008) where an augmentation ratio of 2.2 was achieved for DAWT’s. The conclusions for this study provide an example of improving building performance with renewable wind technology. In accordance with the UAE’s 2030 vision to encourage “sustainability, infrastructure capacity, community planning and quality of life”, the present work hopes to contribute to the mandate.
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Abbreviations
- \( a \) :
-
Axial Induction Factor
- \( A \) :
-
Area
- \( C_{D} \) :
-
Disk Loading Coefficient
- \( C_{p} \) :
-
Power Coefficient
- \( \varvec{\rho} \) :
-
Air Density
- \( \varvec{P} \) :
-
Power
- \( P \) :
-
Pressure
- \( r \) :
-
Augmentation Factor
- \( V \) :
-
Velocity
- BL:
-
Boundary Layer
- CFD:
-
Computational Fluid Dynamics
- CSA:
-
Cross-Sectional Area
- DAWT:
-
Diffuser Augmented Wind Turbine
- HAWT:
-
Horizontal Axis Wind Turbine
- HAWT w. Concentrator:
-
Horizontal Axis Wind Turbine w. Concentrator
- WECS:
-
Wind Energy Conversion Systems
- WT:
-
Wind Turbine
References
Abohela, I., et al.: Effect of roof shape, wind direction, building height and urban configuration on the energy yield and positioning of roof mounted wind turbines. Renew. Energy 50, 1106–1118 (2013)
Abu Dhabi Urban Planning Council: Plan Abu Dhabi 2030, Urban Structure Framework Plan, Abu Dhabi Urban Planning Council (UPC), pp. 1–186. Mandate, Abu Dhabi, UAE (2010)
Asif, M.: Growth and sustainability trends in the buildings sector in the GCC region with particular reference to the KSA and UAE. Renew. Sustain. Energy Rev. 55, 1267–1273 (2016)
United Nations Framework Convention on Climate Change: UN FCCC Paris Dec 2015 Agreement. T.-f. S. Conference of the Parties, Paris, pp. 1–32 (2015)
Hansen, M.O.L.: Aerodynamics of Wind Turbines, pp. 1–175. Earthscan, London (2008)
Igra, O.: Research and development for shrouded wind turbines. Energy Convers. 21, 13–48 (1981)
Kosasih, B., Tondelli, A.: Experimental study of shrouded micro-wind turbine. Procedia Engineering 49, 92–98 (2012)
Krishnan, A., Paraschivoiu, M.: 3D analysis of building mounted VAWT with diffuser shaped shroud. Sustain. Cities Soc. 27, 160–166 (2015)
Nishimura, A., et al.: Wind turbine power output assessment in built environment. Smart Grid Renew. Energy 4(1), 1–10 (2013)
Smith, J., et al.: Built environment wind turbine roadmap, pp. 1–58. National Renewable Energy Laboratory (NREL), Colorado, USA (2012)
Ohya, Y., Karasudani, T.: A shrouded wind turbine generating high output power with wind-lens technology. Energies 3(4), 634–649 (2010)
Toja-Silva, F., et al.: Urban wind energy exploitation systems: behaviour under multidirectional flow conditions—opportunities and challenges. Renew. Sustain. Energy Rev. 24, 364–378 (2013)
UN: Kyoto Protocol to the United Nations Framework Convention on Climate Change, UN, pp. 1–21 (1998)
Walker, S.L.: Building mounted wind turbines and their suitability for the urban scale—a review of methods of estimating urban wind resource. Energy Build. 43(8), 1852–1862 (2011)
Wang, S.H., Chen, S.H.: Blade number effect for a ducted wind turbine. J. Mech. Sci. Technol. 22, 1984 (2008). doi:10.1007/s12206-008-0743-8
Acknowledgments
The research presented has been supported by the funding from Heriot-Watt University, at the School of Energy, Geoscience, Infrastructure and Society.
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Agha, A., Chaudhry, H.N. (2018). A Computational Fluid Dynamics (CFD) Study on Enhancing Green Building Performance in Dubai, UAE Using Diffuser Augmented Wind Turbines (DAWT). In: Calautit, J., Rodrigues, F., Chaudhry, H., Altan, H. (eds) Towards Sustainable Cities in Asia and the Middle East. GeoMEast 2017. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-319-61645-2_8
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DOI: https://doi.org/10.1007/978-3-319-61645-2_8
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