Performance Enhancement of VAWT using Diffuser for Energy Extraction from Cooling Tower Exhaust Air

Renewable energy generation need to be accelerated to battle climate change and depletion of fossil fuel resources. Innovation to design wind recovery system which are efficient is vital to contribute green energy production. Many advancements in vertical axis wind turbines (VAWT) were made over the years however, it is still not as efficient as conventional turbines, and some countries does not have the luxury of strong consistent wind throughout the year. Therefore, this study focuses on extracting wind energy from unnatural sources, specifically for cooling tower exhaust air energy recovery. In this study, cycloidal diffuser with different shroud lengths was used to study the performance of a 3-bladed H-Darrieus VAWT (HDWT) with S-1046 airfoils under accelerated wind conditions in a 3-dimensional numerical study using shear stress transport k-ω turbulence model. The cycloidal diffuser with shroud length of 0.48D increased the HDWT power coefficient by 26.66% compared to the bare HDWT at tip speed ratio of 2.0. Aerodynamics around the energy extractor system was also discussed and this investigation has provided good understanding of the flow behaviour of the wind augmented HDWT under cooling tower exhaust air.

[1]  F. Ismail,et al.  An innovative deflector system for drag-type Savonius turbine using a rotating cylinder for performance improvement , 2022, Energy Conversion and Management.

[2]  Enderaaj Singh,et al.  Optimisation of H-Darrieus VAWT Solidity for Energy Extraction in Cooling Tower Exhaust Systems , 2022, Journal of Advanced Research in Fluid Mechanics and Thermal Sciences.

[3]  E. Kwon,et al.  Optimization of a vertical axis wind turbine with a deflector under unsteady wind conditions via Taguchi and neural network applications , 2022, Energy Conversion and Management.

[4]  Tongguang Wang,et al.  A review: Approaches for aerodynamic performance improvement of lift-type vertical axis wind turbine , 2022, Sustainable Energy Technologies and Assessments.

[5]  B. Karthikeyan,et al.  Numerical and experimental investigation of an exhaust air energy recovery Savonius wind turbine for power production , 2021 .

[6]  Brian Hand,et al.  Aerodynamic design and performance parameters of a lift-type vertical axis wind turbine: A comprehensive review , 2021 .

[7]  H. Fatahian,et al.  Performance improvement of a Savonius vertical axis wind turbine using a porous deflector , 2020 .

[8]  D. Ingham,et al.  Aerodynamic investigation of the start-up process of H-type vertical axis wind turbines using CFD , 2020 .

[9]  L. N. Azadani,et al.  Optimization of the power output of a vertical axis wind turbine augmented with a flat plate deflector , 2020 .

[10]  Global Energy Review 2020 , 2020 .

[11]  W. Chong,et al.  Experimental investigation of a diffuser-integrated vertical axis wind turbine , 2020, IOP Conference Series: Earth and Environmental Science.

[12]  T. Lutz,et al.  Aerodynamic and aeroacoustic performance assessment of H-rotor darrieus VAWT equipped with wind-lens technology , 2019, Energy.

[13]  B. Blocken,et al.  Towards optimal aerodynamic design of vertical axis wind turbines: Impact of solidity and number of blades , 2018, Energy.

[14]  M. Zamani,et al.  Effect of solidity on the performance of variable-pitch vertical axis wind turbine , 2018, Energy.

[15]  Zhenqing Liu,et al.  Numerical study of the wind loads on a cooling tower by a stationary tornado-like vortex through LES , 2018, Journal of Fluids and Structures.

[16]  K. Raahemifar,et al.  A critical review of vertical axis wind turbines for urban applications , 2018, Renewable and Sustainable Energy Reviews.

[17]  M. Paraschivoiu,et al.  Wind turbine designs for urban applications: A case study of shrouded diffuser casing for turbines , 2018 .

[18]  Abdolrahim Rezaeiha,et al.  Effect of pitch angle on power performance and aerodynamics of a vertical axis wind turbine , 2017 .

[19]  Wen Tong Chong,et al.  Performance enhancements on vertical axis wind turbines using flow augmentation systems: A review , 2017 .

[20]  Wen Tong Chong,et al.  Computational and experimental optimization of the exhaust air energy recovery wind turbine generator , 2016 .

[21]  Koichi Watanabe,et al.  Application of a Diffuser Structure to Vertical-Axis Wind Turbines , 2016 .

[22]  Wen Tong Chong,et al.  The experimental study on the wind turbine’s guide-vanes and diffuser of an exhaust air energy recovery system integrated with the cooling tower , 2014 .

[23]  Ernesto Benini,et al.  The Darrieus wind turbine: Proposal for a new performance prediction model based on CFD , 2011 .

[24]  H. Degler Cooling tower fundamentals , 1953 .

[25]  A. A. Nimje,et al.  Design and development of small wind turbine for power generation through high velocity exhaust air , 2020 .

[26]  I. Hashem,et al.  Aerodynamic performance enhancements of H-rotor Darrieus wind turbine , 2018 .