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Erratum
Publication year - 2009
Publication title -
the structural design of tall and special buildings
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 43
eISSN - 1541-7808
pISSN - 1541-7794
DOI - 10.1002/tal.516
Subject(s) - turbine , wind power , wind speed , airflow , rayleigh distribution , environmental science , marine engineering , meteorology , physics , engineering , electrical engineering , optics , rayleigh scattering , mechanical engineering
Erratum: Wind and tall buildings: Negatives and positives The above‐mentioned article was published online on 3 November 2008 (DOI: 10.1002/tal.482). Some errors were subsequently identified within section 3·1 Wind turbines. Please find the corrected version below: […] The available power per square metre of approaching wind may be calculated from 3where ρ is the air density (about 1·2 kg/m 3 ),is the average of the cube of wind speed. Assuming the wind speed distribution is approximately Rayleigh in form, thenmay be estimated using. Therefore, the available power in the wind at turbine height is calculated to be 4To calculate the energy extracted by the turbine, the available wind power P is multiplied by the turbine area and the turbine efficiency. Even an ideal turbine cannot exceed about 59% efficiency (the so‐called Betz limit) because much of the airflow tends to deflect around the turbine due to the turbine drag. Real turbines typically do not achieve overall efficiencies above about 40%. Assuming 40% efficiency, the 52‐m diameter turbine will therefore extract the following energy E from the wind 5where 8766 is the number of hours per year. Assuming the building uses approximately 300 kWh/(year·m 2 ) and that the used floor area is about 45000 m 2 , its energy consumption will be 13·5 GWh/year. […]