Results 161 to 170 of about 35,990 (188)

Exceeding the Betz limit with tidal turbines

Renewable Energy, 2013
Abstract The Betz limit sets a theoretical upper limit for the power production by turbines expressed as a maximum power coefficient of 16/27. While power production by wind turbines falls short of the Betz limit, tidal turbines in a channel can theoretically have a power coefficient several times larger than 16/27.
openaire   +1 more source

Reaching the betz limit experimentally and numerically

2019
The Betz theory expresses that no horizontal axis wind turbine can extract more than 16/27 (59.3%) of the kinetic energy of the wind. The factor 16/27 (0.593) is known as the Betz limit. Horizontal Axis wind turbine designers try to improve the power performance to reach the Betz limit. Modern operational wind turbines achieve at peak 75% to 80% of the
Ranjbar, Mohammad Hassan, Nasrazadani, Seyyed Abolfazl, Zanganeh Kia, Hadi, Gharali, Kobra   +3 more
openaire   +1 more source

Conflicts In Betz Limit and An Alternative Approach for Wind Turbines

2020 IEEE Region 10 Symposium (TENSYMP), 2020
The popularly accepted Betz limit for wind turbines calculates that the incoming wind speed can be reduced to only a third, and efficiency can be at most 59.3 %. This paper suggests that Betz may be based on the paradoxical derivation and assumption that wind speed at the turbine is the average of the incoming and outgoing wind speeds.
openaire   +1 more source

Beating Betz: Energy Extraction Limits in a Constrained Flow Field

Journal of Solar Energy Engineering, 2009
Abstract Experiments with diffusers and other flow concentrating devices have shown that the power performance coefficient Cp of an energy extraction device, defined in relation to the area of flow intercepted at the device, may exceed the Betz limit.
openaire   +1 more source

Racial and socioeconomic disparities in lung cancer screening in the United States: A systematic review

Ca-A Cancer Journal for Clinicians, 2021
Ernesto Sosa, Dan J Raz, Virginia Chih-Yi Sun   +2 more
exaly  

Approaching the quantum limit in two-dimensional semiconductor contacts

Nature, 2023
, , Liang
exaly  

Assessing China’s efforts to pursue the 1.5°C warming limit

Science, 2021
Hong-Bo Duan, Sheng Zhou, Christoph Bertram   +2 more
exaly  

Current global efforts are insufficient to limit warming to 1.5°C

Science, 2022
H Damon Matthews, Seth Wynes
exaly  

Blueprint for cancer research: Critical gaps and opportunities

Ca-A Cancer Journal for Clinicians, 2021
exaly  

Pauli-limit violation and re-entrant superconductivity in moiré graphene

Nature, 2021
Yuan Cao, Jeong Min Park, Kenji Watanabe
exaly