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Limitations of fixed pitch Darrieus hydrokinetic turbines and the challenge of variable pitch

Kirke, B.K.; Lazauskas, L. - In: Renewable Energy 36 (2011) 3, pp. 893-897

Small Darrieus hydrokinetic turbines with fixed pitch blades typically suffer from poor starting torque, low efficiency … helical blades, or reduced by using multiple blades. Starting torque can be marginally improved by the use of cambered blade …

Persistent link: https://www.econbiz.de/10010805922

Performance measurements of cylindrical- and spherical-helical cross-flow marine hydrokinetic turbines, with estimates of exergy efficiency

Bachant, Peter; Wosnik, Martin - In: Renewable Energy 74 (2015) C, pp. 318-325

hydrokinetic energy conversion devices—a cylindrical Gorlov Helical Turbine (GHT) and a Lucid Spherical Turbine (LST). The turbines …Power and drag (or thrust) measurements were performed in a towing tank for two different helical cross-flow marine …-corrected data. The results presented here will help increase the amount of experimental data for helical devices in the literature …

Persistent link: https://www.econbiz.de/10011076853

Comparative investigations for performance and self-starting characteristics of hybrid and single Darrieus hydrokinetic turbine

Saini, Gaurav; Saini, R. P. - In: Energy Reports 6 (2020) 2, pp. 96-100

different hydrokinetic turbine rotors (hybrid and single Darrieus) are evaluated in term of performance and flow across the … hydrokinetic turbine and yields about 9.9% higher power coefficient (CP) than single Darrieus rotor. The average torque coefficient …Hydrokinetic turbine technology is an emerging field to produce clean energy from the riverine systems. Lot of …

Persistent link: https://www.econbiz.de/10012652225

Comparative investigations for performance and self-starting characteristics of hybrid and single Darrieus hydrokinetic turbine

Saini, Gaurav; Saini, R. P. - In: Energy reports 6 (2020) 2, pp. 96-100

Persistent link: https://www.econbiz.de/10012179225

Performance assessment of a small wind turbine with crossflow runner by numerical simulations

Dragomirescu, A. - In: Renewable Energy 36 (2011) 3, pp. 957-965

Most of the classical wind turbines are not able to start at wind speeds as low as 2–3 m/s. Other turbines, like Savonius, have a low maximum efficiency, which renders them useless in poor wind conditions. Therefore, new turbine designs are required to harvest wind power even when the wind...

Persistent link: https://www.econbiz.de/10011045035

The future of the "spiral paradigm" in climate action

Boje, David M. - In: The Emerald handbook of management and organization inquiry, (pp. 253-261). 2019

Persistent link: https://www.econbiz.de/10012027443

Characteristics of a highly efficient propeller type small wind turbine with a diffuser

Matsushima, Toshio; Takagi, Shinya; Muroyama, Seiichi - In: Renewable Energy 31 (2006) 9, pp. 1343-1354

We studied the improved effects a diffuser had on the output power of small wind turbine systems, aiming to introduce … these systems to radio relay stations as an independent power supply system. A frustum-shaped diffuser was chosen from an … economical standpoint and wind speed distribution. The effect the diffuser's shape had on the wind speed was analyzed by …

Persistent link: https://www.econbiz.de/10010804677

Use of diffuser in passive daylight solar lighting

Mc D. Saunders, R.; Simon, J.; Jahoor, S. - In: Renewable Energy 8 (1996) 1, pp. 223-226

A passive solar lighting system that mimics conventional electrical lighting systems has been developed. The system consists of a filon light collector with a boxlike system of diffusers. It has been applied to an office area in Trinidad and Tobago and its effectiveness evaluated. Results...

Persistent link: https://www.econbiz.de/10010804784

A Shrouded Wind Turbine Generating High Output Power with Wind-lens Technology

Ohya, Yuji; Karasudani, Takashi - In: Energies 3 (2010) 4, pp. 634-649

We have developed a new wind turbine system that consists of a diffuser shroud with a broad-ring brim at the exit … periphery and a wind turbine inside it. The shrouded wind turbine with a brimmed diffuser has demonstrated power augmentation by … inside the diffuser shroud. …

Persistent link: https://www.econbiz.de/10010668075

A numerical investigation into the effect of diffusers on the performance of hydro kinetic turbines using a validated momentum source turbine model

Gaden, David L.F.; Bibeau, Eric L. - In: Renewable Energy 35 (2010) 6, pp. 1152-1158

source region, a strategy that is first validated against Betz theory. The diffuser configuration produces 3.1 times more … power than the turbine with no diffuser. A scaling analysis also shows a turbine with a diffuser outperforms a larger size … turbine with no diffuser. …

Persistent link: https://www.econbiz.de/10010806293