Wind Turbine

Wind Turbines

This is the energy that helped the pioneering Americans to conquer the frontier, where, every village and farm was dotted with a wind mill .
Wind energy is free and clean and available in abundance and created without having to burn fossil fuels or manufacturing process that damages the environment.

The estimated energy that can be harvested in the wind is 20million MW world wide according to World Metro logical Organization.

Advantages of wind energy:

a) It is clean and does not employ fossil fuel
b) It can be installed in great speed unlike hydro energy
c) It is cost less those solar or any other sources of energy. It is about 3 cents/kWh compared to 5cents for coal powered plants.
d) It is modular system and can be added upon
e) It does not depend on the sun and the time of harvest in not restricted to the day but wind may be harvested during the night and storm situations when there is wind. About 90% of the time the wind turbine can harvest energy. The minimum wind for wind to be harvested is getting lower, presently technology to harvest wind as low as 5m/s
f) The cost of wind energy does not depend on the prices of fossil fuel or the market forces.
g) It is 60% efficient compared to 20 to 40 % efficiency of Photo voltaic panels.

The offshore wind energy is becoming more popular in UK and in the US, the following are some of the projects:
1.)Thanet off shore wind farm
Total off shore wind energy off the US Atlantic has the potential to take off the fossil fuel by 30% total energy off the grid.
2.) Vatenfall off shore wind farm
The wind turbine in England supplies energy for 200,000 homes built for £780 m it has 100 no of turbines of 380ft over 35km2 , Vatenfall, a Sweddish company secured the project

3. Block Island Wind Farm
Google has scheduled to construct along the Atlantic ocean for deep sea wind turbines along a 35m transmission line to generate electricity for 17.000 households- Block Island Wind Farm will tap the enormous energy of the Atlantic coastal winds.
4. Wind farm in Yorkshire England
The world largest wind farm in Yorkshire England will provide energy for 2,000,000 households. English pounds 14.5bm. Wind farm, comprising of 100 turbines of 380m high {115m} and spanning over an area of 35km sq{13.5 sq mile}

Wind energy is proportionally related to the following factors:
a) Wind speed
b) size of wind blades
c) type of blade system
d) the height of the wind turbine

A modern wind turbine produces electricity 90% of the time, but it generates different outputs depending on the wind speed.
a turbine’s best efficiency is 40% at a wind velocity of 9 meters per second (about 20 mph), it will be 40% only at that wind speed. At all other wind speeds it will be something worse.

Consideration for design

The wind should be 5-8mph, the height of the wind turbine is be above the surrounding by 10m to receive unobstructed wind supply, the supply of wind is uncertain but is available during the night, cloudy days, when the PV panels don’t work, complementing with the PV solar panels as a Hybrid system, may be a good consideration as they compliment each other. Location of site near the sea coast will make wind turbines a more viable option by the strong wind

Some interesting facts
The amount of energy the world needs is 155,500TetraWatt per Hour, which is 155.5x1012KwH.

The amount of energy the earth received from the sun is 10.3x1017KwH which compared to amount of energy that is sent in not 1%, not 0.1% but 0.015% which is a pittance of a proportion. Conclusive is to say that this calls for a case of renewable energy, if we could tap the energy from the sun, the energy we consume is hardly anything to think off in comparison to the environmental damage we create by fossil fuel. The energy of the sun is used for converted into wind, wave, movement of air and the vegetation in it.

Moreover the amount of Geothermal energy available in the US , according to a report produced in Harvard ,is sufficient to supply the US’s energy for 2000 years.

Hyper Green architect

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Prepared by Architect Perumal Nagapushnam
System Design Architect