Wind is blowing at 55 km/hr. in a windy province in Mindanao. The Wind Energy Conversion System (WECS) proposed to install a wind-turbine generator set with an over-all efficiency of 68%. If the power that can be generated is 339.08 KWe, calculate the fan blade diameter of the wind-turbine.

1. A rigid tank whose volume is 10 liters is initially evacuated. A pinhole develops in the wall, and air from the surroundings at 1 bar, 25C enters the pressure in the tank becomes 1 bar. No significant heat transfer beween the contents of the tank and the surroundings occur. Assuming the ideal gas model with y 1.4 for the air, determine: (a) final temperature in the tank (b) amount of air that leaks into the tank

A wind generator rotates at 17 rpm on the rotor (the part with the blades). It is a direct drive (meaning the rotor connects directly to the generator). The generator is 86% efficient and produces 3.1 MW. What is the torque on the rotor?

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