According to Betz's law, no turbine can capture more than 16/27 (59.3%) of the kinetic energy in wind. The factor 16/27 (0.593 derived from kinetic energy, pressure difference from incoming wind to outgoing wind molecule) is known as Betz's coefficient. Practical utility-scale wind turbines achieve at peak 75% to 80% of the Betz limit due to mechanical and electrical losses. why it is 0.593 only? Look in to the below figure, the air molecule(Blue Dot) has a good kinetic energy, when it is hit by a wind turbine blade the kinetic energy decreases, which also decreases the up coming air molecule velocity. Go through the below image to under stand better. In practical wind turbine achieve maximum of 75% to 80% of Betz limit, due to mechanical and electrical losses in wind turbine. Simple cartoon of two air molecules shows why wind turbines cannot actually run at 100% efficiency. (source: Wikipedia) Do you think multiple blade wind turbine generate more energy? Always I was thinking that more blade the turbine will generate more power, But that concept is completely wrong, The below figure shows the Cp (Power Coefficient of different type of wind turbine) Betz law is the maximum theoretical power coefficient (Cp) which wind turbine can achieve. Below figure show the power coefficient of different type of wind turbine (Green line is the Betz limit).
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AuthorBhuvan Kumar C A ArchivesCategories |