Numerical and experimental investigation of an exhaust air energy recovery Savonius wind turbine for power production

Berhanu, Hailemariam; Gunjo, Dawit Gudeta; Lenin, A. Haiter; Karthikeyan, B.

doi:10.1016/j.matpr.2021.02.675

Cited by 14 publications

(9 citation statements)

References 6 publications

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“…The work [9] analyzed the installation of a Savonius wind turbine at the outlet of industrial exhaust air fans, and the possibility of recovering energy from outgoing air was determined. In [10] a system was proposed to take advantage of the output wind energy in industrial extractors, by means of a wind turbine that converts this energy into electrical energy.…”

Section: Introductionmentioning

confidence: 99%

Harvesting air energy from extractors with a small horizontal axis wind turbine

Romantchik¹,

Santos²,

Terrazas³

et al. 2024

RE&PQJ

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In greenhouses and other agricultural facilities, air extractors are used for air renewal and control of environmental conditions. The electrical energy delivered to the extractor is converted into the energy of the exhaust air and is lost in the atmosphere. The objective of this work was to test a small horizontal axis wind turbine (SHWT) installed in front of an axial extractor and to present the energy balance of the extractor-wind turbine assembly. This was done for four different treatments: extractor alone, extractor with cone, extractor with a wind turbine, and extractor with cone and a wind turbine. A statistical analysis was performed, obtaining means and standard deviations. The energy balance analysis showed that with the designed device, built including a cone and a SHWT and installed at the outlet of the extractor, it is possible to harvest up to 50% of the wind energy that leaves the extractor and is lost in the atmosphere.

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Section: Introductionmentioning

confidence: 99%

Harvesting air energy from extractors with a small horizontal axis wind turbine

Romantchik¹,

Santos²,

Terrazas³

et al. 2024

RE&PQJ

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show abstract

“…On top of that, the presence of VAWT at the cooling tower outlet also manages to reduce the cooling tower's fan motor power consumption. In another study, Berhanu et al [15] attempted an experimental study to recover exhaust air energy from the exhaust of a composite textile mill by using a Savonius type turbine. This was done by increasing the velocity of the exhaust air by placing a drag force blocker, which managed to increase the velocity of the air approaching the turbine by 4 times.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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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.

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“…Optimum locations of VAWT with the use of guide vanes, modified plate diffusers and separator plate successfully increased the VAWT rotational speed resulting in 13% energy recovery and reducing the power consumption by the cooling tower fan motor [17,18]. Berhanu et al, [19] experimentally used enclosure and drag force blocker in an exhaust air application and successfully increased the exhaust air speed approaching a Savonius type turbine by four times which can potentially increase its performance by 86.8%. Still, the energy recovery efficiency was not calculated.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of H-Darrieus VAWT Solidity for Energy Extraction in Cooling Tower Exhaust Systems

Singh

Roy

San

et al. 2022

ARFMTS

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The technologies surrounding renewable energy have been receiving surmountable attention to producing clean energy and reducing the dependency on depleting fossil fuel sources. In this context, research investigations on vertical axis wind turbines (VAWT) in free stream flow condition has been extensively conducted to improve the energy extraction efficiency from the wind. VAWTs are particularly advantageous in locations not suitable for conventional horizontal axis wind turbines (HAWT). However, the applications of VAWTs are still limited due to their lower performances compared to their counterparts. Furthermore, the wind energy extraction problem is more prominent in urban areas with unpredictable and inadequate wind speed conditions. The present study focuses on an alternative way to harness wind energy from unnatural sources such as cooling tower exhaust systems with the reliable and consistent exhaust air. A three-dimensional numerical study has been conducted to investigate the performance of a 3-bladed H-Darrieus wind turbine (HDWT) using S-1046 airfoils of four different solidities under accelerated wind conditions of a cooling tower. The HDWT model is positioned at the cooling tower outlet, where it rotates using sliding mesh to measure the power output. Shear stress transport (SST) k- turbulence model solver was used to solve the implicit unsteady Reynolds-Averaged Navier-Stokes equations. It is observed that the higher solidity HDWT reached peak power coefficient at a lower tip speed ratio (TSR). In contrast, lower solidity HDWT achieved peak power coefficient at higher TSR. The higher solidity 0.375 and 0.450 produced a maximum power coefficient of 0.233 at TSR of 2.0.

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Numerical and experimental investigation of an exhaust air energy recovery Savonius wind turbine for power production

Cited by 14 publications

References 6 publications

Harvesting air energy from extractors with a small horizontal axis wind turbine

Harvesting air energy from extractors with a small horizontal axis wind turbine

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

Optimisation of H-Darrieus VAWT Solidity for Energy Extraction in Cooling Tower Exhaust Systems

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