Tag Archive | alternative energy documentary

[BBC Documentary 2015] Renewable Energy: NEW+ Science Documentary HD

Home Solar Panels- The Advantages and Disadvantages

These days, lots of people are turning their way on using solar panels. It is truly gaining more and more popularity due to its durability, efficiency, and friendliness for the environment. On the other hand, right before you use home solar panels, it would be a good idea for you to consider its pros and cons first.


Unlike the fossil fuels, solar energy could never run out. It only means that the energy which is generated by the sun could never be exhausted and will always give unlimited solar energy or dispersion. It is considered to be the biggest advantage of solar energy. Thus, if you install this type of system into your house, you could ensure yourself that you will have enough electricity right at your dispersal.

If you also install solar panels, you could have the best economic option right after the initial cost for the set-up. Practically, there is no need for you to pay more. The solar energy is free and could also free you from monthly electric bills too.


Since the home solar cell panels need the sun to shine brightly on them, when you are on a place which has less sunlight, this could be a difficult thing. It specially happens in the northern hemisphere wherein certain places do not actually see sunlight for about 6 months at stretch. Similar problem has been faced by people throughout monsoons.

Another disadvantage is that, the charge for initial installation of the home solar panel systems is high. It is a large drawback of the solar panel systems installed at homes. With such, lots of people choose to stay away from this system due to its affordability issues.

Knowing the pros and cons of home solar panels could help one out in deciding whether they have to take home solar panels or not.

Sustainable Power Of The Wind

With so much talk about environmental damage, dwindling fossil fuels, and sky rocketing oil and energy prices it is now clear that we must look for alternative energy resources that will be able to supply our endless needs without the possibility of it being exhausted.

A Brief Lesson in History

A sustainable energy source since ancient times, the power of the wind has been harnessed by sailors, farmer, and architects alike. In times long gone, from 5,000 years ago and rediscovered again today the Egyptians used wind power to propel their sailing vessels, and Babylonian architects use architectural designs to make use of the wind to ventilate their palace and temple complexes.

As early as 300 B.C. the Sinhalese bygones used monsoon winds to power their furnaces. Constructed right where monsoon winds pass the furnaces were powered up to 1100 to 1200 centigrade. In the 1st century AD the first ever primitively built windmill was used to power an organ. Later during the 7th century the first and most primary windmill was built in Afghanistan in a small town called Sistan. The Windmill has a vertical axle with blades shaped like a rectangle and with a long driveshaft. In the 1100’s wind mills were built to grind flour, for sugar manufacturing and the gristmilling industries. The Dutch built windmills that stand until this day.

Beneath Power Is Wind

The Sun unevenly heats the Earth that differences of heat distribution; the poles receive less than the equators do. Unlike the land, the oceans, seas and rivers do not have covering so it retains more heat than soil. This contrast results in a global atmospheric convection that reaches from the stratosphere and into the earth’s surface. Energy in these wind movements are stored at high altitudes where in the wind can achieve speeds up to 160km/hr. Here after with the effects of friction the wind’s energy is diffused into heat throughout the planet and its atmosphere. This vast amount of sustainable power can provide us unimaginable amounts of energy, far more than we currently consume.

Wind Speed Distribution

Wind varies in strength. The average value of a certain location does not specify the energy of a single wind turbine. The wind speed’s frequency can be assessed in a particular location, they are fitted by a probable distribution function to the particular observed data. Different wind distributions varies from different locations, hourly wind speeds at different locations are being monitored by the Rayleigh model, which basically means a continuous probability distribution which was named after Lord Rayleigh.

Electrical Generation

Using the power of electricity from a wind farm is usually fed through a network of electrical power transmissions. This is done by connecting the individual turbines with a medium voltage power system and a series of communications networks. The electrical current is then increased with a transformer to be able to connect to the high voltage transmitting system. System operators supplies the wind farm owner with a code that indicates requirements to be able to connect to the transmission grid which includes the power factor, the constancy of the frequency and the behavior of the wind turbines when experiencing system faults.

Now that we know that the speed of wind is not constant, a farm’s energy production is not as much as the sum of the nameplate rating being multiplied by the year’s total hours being used. The ratio of this productivity in a whole year is called the capacity factor. This is the ratio of productivity in a year to this theoretical maximum.