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# Ch.3 wind power

## on Jul 10, 2013

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AS per GTU syllabus, ECHM chap. 3

AS per GTU syllabus, ECHM chap. 3

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## Ch.3 wind powerPresentation Transcript

• CHAPTER 3 WIND POWER Missamraza Mechanical Dept. LJ Polytechnic GTU WEIGHTAGE:- 14 MARKS
• Wind Power Where Does the Wind Come From?  The wind is a by-product of solar energy.  Approximately 2% of the sun's energy reaching the earth is converted into wind energy.  The surface of the earth heats and cools unevenly, creating atmospheric pressure zones that make air flow from high- to low- pressure areas. Missamraza Mechanical Dept. LJ Polytechnic
• Wind Power Equation Of Wind Power  The amount of power available in the wind is determined by the equation: w = 1/2 r A v3  w is power, r is air density, A is the rotor area, and v is the wind speed.  This equation states that the power is equal to one-half, times the air density, times the rotor area, times the cube of the wind speed. Air density varies according to elevation, temperature and weather fronts Missamraza Mechanical Dept. LJ Polytechnic
• Wind Turbines Defination  rotary engine in which the kinetic energy of a moving fluid is converted into mechanical energy by causing a bladed rotor to rotate”. Wind rotates the turbine blades:- 1. spins a shaft connected to a generator 2. The spinning of the shaft in the generator makes electricity Missamraza Mechanical Dept. LJ Polytechnic
• Wind Turbines Classification There are two types of wind turbines 1. Horizontal axis wind turbine (HAWT) 2. Vertical axis wind turbine (VAWT) Missamraza Mechanical Dept. LJ Polytechnic
• Horizontal axis wind turbine (HAWT) Introduction  This is the most common wind turbine design.  In addition to being parallel to the ground, the axis of blade rotation is parallel to the wind flow.  Some machines are designed to operate in an upwind mode, with the blades upwind of the tower. In this case, a tail vane is usually used to keep the blades facing into the wind.  Other designs operate in a downwind mode so that the wind passes the tower before striking the blades. Missamraza Mechanical Dept. LJ Polytechnic
• Horizontal axis wind turbine (HAWT) Types 1. ACCORDING TO NUMBER OF BLADES A. MONOBLADE B. TWINE BLADE C. TRIPLE BLADE 2. ACCORDING TO POWER OUTPUT A.SMALL CAPACITY- 10-50KW; ROTOR DIA. 1-16METERS B.MEDIUM CAPACITY: 50-500KW; ROTOR DIA. 16-50METER C.LARGE CAPACITY: 500-1000KW; ROTOR DIA 50-130METER Missamraza Mechanical Dept. LJ Polytechnic