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WINDENERGY PPT.pptx
- 1. WIND ENERGY Non-conventional energysource PRESENTER: EEDIGA SIVA SHANKAR ROLL NO: 20EE01039 SUPERVISOR : DR.SRINIVAS BHASKAR KARANKI EXAMINER: PROF.N.C.SAHOO
- 2. 0VER VIEW Introduction Design andconstruction Working Bet’z law and its limit Wind Power Types of wind turbines Availability of Wind power in India Future of wind energy Advantages of wind energy Challenges of wind energy Conclusion references
- 3. Introduction: what is windand wind energy? Wind energy is a converted form of solar energy. The sun’s radiation heats different parts of earth at different rates during day and night , also different surfaces absorbs or reflect heat in different rates. This in turn causes portions of atmosphere to heat differently. Hot air rises up, reducing atmospheric pressure at the earth surface and cooler air is drawn in to replace it. This results in wind and energy it is carrying is wind energy.
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- 10. Continued… 10 20 35 42 0 10 20 30 40 50 60 70 1800 1850 19001950 2000 2050 BETZ'S LIMIT YEAR Betz's limit vs year 59.3 %
- 11. What is bet’zlaw and its limit? Bet’z law says that we can only convert less than 16/27 (59%) of the KE in wind to mechanical energy using a wind turbine. PROOF… Consider a wind turbine which placed inside a “stream tube” Let 𝑣1 be velocity at entry and 𝑣2 be velocity at exit of wind in stream tube. Average speed of wind through rotor=(𝑣1 + 𝑣2 )/2=V Mass of air flowing through rotor per second (m)=A* d*V Power extracted from wind according to Newton’s 2nd law is p=0.5 × 𝑚 𝑣1 2 − 𝑣2 2 = 1 4 × 𝑑 × 𝐴 𝑣1 + 𝑣2 𝑣1 2 − 𝑣2 2
- 12. Continued… NOW, let𝑃0 be total power in the undisturbed wind flow through exactly the same area A,with no rotor to block the wind 𝑃0 = 1 2 𝑚𝑣1 2 = 1 2 𝑑𝐴𝑣1 ∗ 𝑣1 2 = 1 2 𝐴 ⅆ𝑣1 3 Now, let us find p/ 𝑃0 p/ 𝑃0= 1 2 1 − 𝑣2 𝑣1 2 1 + 𝑣2 𝑣1 This p/ 𝑃0 ration is known as Coefficient of Performance of wind turbine Now ,ploting graph between p/ 𝑃0 and 𝑣2 𝑣1 we can see that the maximum value of power extracted is 0.59 of total power of wind.
- 13. Wind power P= ½ * air density * Area Swept by Rotor * Wind Speed3 P = ½ * d * A * V3 1) Power in the wind is correlated 1:1 with area and is extremely sensitive to wind speed (the cubic amplifies the power significantly) 2) If the wind speed is twice as high, it contains 2^3 = 2 x 2 x 2 = 8 times as much energy 3) A site with 16 mph average wind speed will generate nearly 50% more electricity and be more cost effective than one with 14 mph average wind speed (16*16*16) / (14*14*14) = 1.4927 4) Energy in the wind increases as height increases (theoretically) V2/V1 = (H2/H1)^(17)
- 14. Types of windturbines: Horizontal axis Horizontal axis turbines the axis of rotation is parallel to the ground. Vertical axis In this type of wind turbine the axis of rotation is perpendicular the ground
- 15. Availability of wind energyin India: India’s wind energy sector is led by indigenous wind power industry and has shown consistent progress. The country currently has the fourth highest wind installed capacity in the world with total installed capacity of 39.25 GW (as on 31st March 2021) and has generated around 60.149 Billion Units during 2020-21. 1 China – installed capacity 221GW. China is the world leader in wind energy, with over a third of the world’s capacity. 2) US – installed capacity 96.4GW. 3) Germany– installed capacity 59.3GW 4 )India – installed capacity 39.25GW. 5 )Spain – installed capacity 23GW.
- 16. Future of WindEnergy. By 2050, the agency says, wind energy could account for 35%(6000GW) of global energy needs Installed capacity of onshore wind power increases more than threefold by 2 030 (to 1,787 gigawatts) and nine-fold by 2050 (to 5,044 GW) compared to installed capacity in 2018 (542 GW),” the agency says. “For offshore wind power, the global the global cumulative installed capacity would increase almost tenfold by 2030 (to 228 GW) and substantially towards 2050, with total offshore installation nearing 1,000 GW by 2050,”.
- 18. Advantages of windenergy Earth will continue to provide wind energy Replaces coal-fired power plants which causes global warming Occupies smaller footprint and can share space for other interests Provides electricity to remote areas where the electric grid doesnot reach. Creates Job opportunities .
- 19. Challenges of Windenergy Some places may have too strong winds due to hurricanes season that may damage wind turbines. Wind doesn’t blow well at all places of earth, so not all places are suitable for generating wind power. The storage of excess energy from wind turbines in the form of batteries or other forms still need research. Depending upon the size and type of wind turbines, noise pollution may be a factor for those living or working nearby.
- 20. Conclusion: Wind energy isprobably the solution for our energy needs in future. It has great potential and is easy to manage. As long as the wind blows, wind turbines can harness the wind to create power. Unlike coal, wind turbines don’t create greenhouse gasses and and is completely renewable source. Many people believe that the wind energy could soon be our main source of energy. Though wind turbines can cause complaints and fatalities of wildlife, it could be the energy solution we have been looking for.
- 21. References: Wind power -Wikipedia Wind Energy | National Geographic Society Advantages and Challenges of Wind Energy | Department of Energy Wind Power - The New York Times (nytimes.com) Image credit-Google.
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