Methods to Use to Minimize Green House Effect
Unit-4Lecture 25
Methods to use to minimize Green House Effect
- Wind Energy:
Winds are essentially created by the solar heating of the atmosphere. Several attempts have been made since 1940 to use wind to generate electric energy and development is still going on. However, techno-economic feasibility has yet to be satisfactorily established. Wind as a power source is attractive because it is plentiful, inexhaustible and non-polluting. Further, it does not impose extra heat burden on the environment. Unfortunately, it is non-steady and undependable. Control equipment has been devised to start the wind power plant whenever the wind speed reaches 30km/h. Methods have also been found to generate constant frequency power with varying wind speeds and consequently varying speeds of wind mill propellers. Wind power may prove practical for small power needs in isolated sites. But for maximum flexibility, it should be used in conjunction with other methods of power generation to ensure continuity.
For a rotor of 17m diameter and a velocity of 48 km/h the theoretical power is 265kW and the practical would be roughly half of this value.
There are some distinctive energy end-use features of wind power systems:
1. Most wind power sites are in remote rural, island or marine areas.
2. Rural grid systems are likely to be ‘weak’ in these areas, since they carry relatively low voltage supplies (e.g.33kV).
Advantages:
• Wind energy is friendly to the surrounding environment, as no fossil fuels are burnt to generate electricity from wind energy.
• Wind turbines take up less space than the average power station. Windmills only have tooccupy a few square meters for the base, this allows the land around the turbine to be used for many purposes, for example agriculture.
• Newer technologies are making the extraction of wind energy much more efficient. The wind is free, and we are able to cash in on this free source of energy.
• Wind turbines are a great resource to generate energy in remote locations, such as mountain communities and remote countryside. Wind turbines can be a range of different sizes in order to support varying population levels.
• Another advantage of wind energy is that when combined with solar electricity, this energy source is great for developed and developing countries to provide a steady, reliable supply of electricity.
Dept. of EEE, NIT-RaichurPage 1