Energy Pattern Factor

For each wind speed data column, Windographer calculates the energy pattern factor (also called the cube factor) using the following equation:

where:
	N	is the number of time steps
	U_i	is the wind speed at time step i
	U	is the mean wind speed [same units as U_i]

If one were to assume constant air density, the energy pattern factor would be the ratio of the actual mean wind power density to the wind power density one would calculate using only the mean wind speed:

where:
		is the mean wind power density [W/m³]
	r	is the air density [kg/m³]
	U	is the mean wind speed [m/s]
	K_e	is the energy pattern factor

Windographer displays the energy pattern factor for each wind speed sensor in the Wind Speed Sensor Summary table.