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5. Renewable Electricity Technologies ….. Cont’d- The mechanical power output of a wind machinemay be expressed as:- Pout = Cp (½ SAV³)- Where Cp is Beltz limit (≅ 0.59)A is Rotor swept AreaS is density of airV is wind speed- Maximum theoretical efficiency of wind machine isabout 59% (Beltz limit). Typical practicalaerogenerator efficiencies lie between 10% and30%.- Aerogenerators may produce ac or dc current,depending upon the types of generators.Prof. A. S. Sambo26
5. Renewable Electricity Technologies ….. Cont’dFig. 5: A Typical Power Output Curve of aWind Powered Turbine (Ge Power System –1.5 SL)- Wind electricity is oftengenerated onshore for singleunit capacities of up to 5MW.- Wind electricity can also begenerated from both the shallowand deep offshore waters forsingle unit capacities greaterthan 5MW, because of higherwind.- Wind turbines have life spans of20 – 25 years.Prof. A. S. Sambo27
Page 8 and 9: Introduction ………. Cont’d•
Page 10 and 11: 2. Development of the National Ener
Page 12 and 13: 2. The Policy Framework on Renewabl
Page 14 and 15: 4. NATIONAL ENERGY MASTERPLAN NEMP)
Page 16 and 17: 4. National Energy Masterplan (NEMP
Page 18 and 19: 5. Renewable Electricity Technologi
Page 24 and 25: 5.. Renewable Electricity Technolog
Page 34 and 35: 6. Renewable Electricity Production
Page 42 and 43: 7. CHALLENGES TOWARDS RENEWABLEELEC
Page 44 and 45: 7. Challenges Towards Renewable …
Page 46 and 47: 8. The Way Forward ………. Cont
Page 48: Prof. A. S. Sambo48

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