Betz' law is a theory about the maximum possible energy to be derived from a wind turbine. It was developed in 1919 by German physicist Albert Betz. According to the rule, no turbine can capture more than 59.3 percent of the potential energy in wind.Cp
- P = Power in Watts
- p = Air Density in kg/m3
- S = Turbine Area in m2
- v1 = Wind Speed in m/s
- Cp = Coefficient of performance = 0.593 or 59.3%
Betz' Law Calculator
- The rotor does not possess a hub, this is an ideal rotor, with an infinite number of blades which have 0 drag. Any resulting drag would only lower this idealized value.
- The flow into and out of the rotor is axial. This is a control volume analysis, and to construct a solution the control volume must contain all flow going in and out, failure to account for that flow would violate the conservation equations.
- This is incompressible flow. The density remains constant, and there is no heat transfer from the rotor to the flow or vice versa.