Vertical Axis Wind Turbine ,Insensitive to Wind Direction
10 May 2009 | Wind Power | 1 Comment
“It has been estimated that the total wind power in the atmosphere averages about 3.6 × 1012 kW, which is an annual energy of about 107,000 quads (1 quad = 2.931 × 1011 kWh). Only a fraction of this wind energy can be extracted, estimated to be a maximum of 4000 quads per year. According to what is commonly known as the Betz limit, a maximum of 59% of this power can be extracted by a wind machine. Practical machines actually extract from 5 to 45% of the available power. Because the available wind power varies with the cube of wind speed, it is very important to find areas with high average wind speeds to locate wind machines.” – http://encyclopedia2.thefreedictionary.com/Wind+energyHow to Build The Most Efficient Wind Farm
5 May 2009 | Wind Power | 10 Comments
Wind is the air in movement with a certain speed due to the pressure gradients over the earth surface produced by solar radiation.In Equatorial Regions the air temperature is greater than in Polar Regions, and air pressure gradient results.Therefore a mass of air flow with a certain kinetic energy is developed.Kinetic energy of the wind can be converted into mechanical energy using wind turbines.Shaft of wind turbines can drive electric generators producing electrical energy.
What is Called as Being Sustainable?
22 April 2009 | Green News | No Comments
The adjective “sustainable” is associated with different terms included under the generous concept – sustainable development.These terms are used in literature, not in a unitary way, so the present text is far from being exhausting.
a)Sustainable system.
To understand the terms in a systemic conception, the concept of “sustainable system” is firstly defined, as the system that survives in a specified period.The sustainable system fulfils the expected life-time, however, no system has an infinite life-time.Thus, the sustainability of systems becomes a matter of predicting a set of surviving conditions for a specified finite time.
b)Sustainable society.
The end of the XX-th century was characterised by the recognition of the trilemma generated by a harmonisation of the economic growth, a distribution of resources and preservation of the environment.A society living in a harmony with nature and with itself is frequently called sustainable society.
c)Sustainable environment.
Sustainable environment – the resources are able to sustain life, health and the development within acceptable limits, on the one hand, and to regenerate itself, on the other one.
d)Sustainable future.
Healthy environment, economic prosperity and social justice, simultaneously responding the purpose of ensuring the well-being and the quality of life for the present and future generations, describe, what is called “sustainable future“.The crucial element to reach this future is education.
Video of How to Build a Magnetic Motor
22 April 2009 | Alternative Energy | 3 Comments
Theoretically speaking, a magnetic motor is a device that converts magnetic energy into mechanical energy. Usually, a magnetic motor produce a rotating motion without using other energy sources. One of the most popular magnetic motor is the Perendev motor and is based on the magnetic rejection principle. This engine has a rotor that rotates around its own longitudinal axis and a set of magnetic sources arranged on a stator around the rotor. In the rotor there are some magnets wich interact with a second set of magnets around the rotor. Inside the rotor and stator there are some holes where are located the magnetic sources. These holes are placed perpendicularly to the rotation axis, and magnetic sources are cylindrical magnets of 360000 Gauss, with 37mm diameter and 75mm length.
Solar Cooling for Businesses and Apartments
11 April 2009 | Solar Power | 1 Comment
As described in erlier chapters, solar energy can produce electricity and heat.A range of heat-fired appliances running on natural gas has recently been introduced to the market-place.The most interesting of these are absorption coolers used in larger builgings for natural gas-powered air-conditioning systems.Absorbption cooling if efficient and reliable, and becoming more common in the traditional marketplace.
Happily, products on market today include a solar absorption cooling system for commercial applications and schools.These are natural gas units in which a solar collector is used during the day to direct heat to the absorption cooler.At night or on rainy days, the bsorbption cooler is heated with natural gas.The company also incorporates solar water heating and solar daylighting in many of their installations to offset even more energy costs.Since the energy used to cool your buildings is one of the largest components of energy bills, this technology will be a solid long-term investment for businesses or government buildings.
As with other solar options,longer-term financing and a lower interest rate will ensure a reliable monthly net gain on energy costs.