First, the wind energy density.
Wind energy is a renewable clean energy, people use wind power, wind energy will certainly have to choose a larger place to put wind turbines.
So, how to quantitatively obtain wind somewhere?
We can use the following formula:
Wind energy density is more convenient than the use of wind energy, because less of the area A and time t two variables.
But the wind velocity is changing all the time, so can not be used to assess how much instantaneous wind speed of wind energy, but to use the average wind speed average wind energy density.
Since this is a continuous-time integration with MCU difficult to calculate the results, so to obtain discrete domain, then:
Wherein, ρ is the air density.
Second, the air density.
Density of air at different pressure and a different temperature is not constant.
Depending on the humidity, air density and air density points humid air dry densities of the two.
1, the density of dry air.
Dry air density = 1.293 * (Actual Pressure / atm) x (273.15 / actual absolute temperature).
Atm = 101.325kPa.
= Absolute temperature in degrees Celsius +273.15.
2, the density of moist air.
Where: Pg dry air pressure, Pq is the water vapor pressure, B is the atmospheric pressure.
3, the relative humidity.
Wherein, φ is the relative humidity, Pq is the water vapor pressure, Pqb saturated water vapor pressure.
Wherein the saturated water vapor pressure can be obtained look-up table.
In the case where not strictly required, can be obtained by using dry air density wind energy density.
BMP180 integrated pressure sensor and a temperature sensor, we can use it to obtain the density of dry air.
Third, the physical map.
