Question

1.

A dozen (12) wind turbines operate within a small wind farm. If the average wind velocity over the course of a day is 27.3 m/s, calculate the power generated if each turbine collects from a circular area of diameter 23.1 m and operates at the Betz limit with a mechanical efficiency of 33.8%. (Answer in MW, note the density of air is 1.225 kg.m^-3)

2.

A wind turbine has a tip velocity is 69.5 m.s^-1, and a blade diameter of 20.4 m. Calculate the rotational frequency of the turbine.

3.

The burning of wood produces, on average, a power output of 8.3 MJ/kg. How much power can be generated if wood is burnt at a rate of 14.1 kg per hour, where the power is obtained by heating water to steam to turn a turbine with an efficiency of 42.9%? (Answer in kW)

Answer 1