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Basic Principles of Solar Energy

by Solar Power Guide on December 21, 2008


How Solar Energy is Created

Solar energy consists of the light and heat emitted by the sun, in the form of electromagnetic radiation.

With today’s technology, we are able to capture this radiation and turn it into usable forms of solar energy - such as heating or electricity.

Although one could go into technical dissertations on the subject of electromagnetic radiation, how it is converted into solar energy, and the exact qualities of its electromagnetic rays, this is not something the average person needs or wants to know.

But in order to benefit the most from the use of solar power, there are a few facts you should know. Knowing these facts can assist you to make a sound decisions, when looking at the use of solar power as a clean energy source for your home, RV, or whatever the case may be.

Available Solar Resource

The technical feasibility and economical viability of using solar energy depends on the amount of available sunlight (solar radiation) in the area where you intend to place solar heaters or solar panels.

This is sometimes referred to as the available solar resource.

Every part of Earth is provided with sunlight during at least one part of the year. (I say “part of the year” as the north and south polar caps are each in total darkness for a few months of the year.) The amount of sunlight available is one factor to take into account when considering using solar energy.

There are, however, a few other factors which need to be looked at when determining the viability of solar energy in any given location. These are as follows:

* Geographic location

* Time of day

* Season

* Local landscape

* Local weather

Because the Earth is round, the sun hits its surface at different angles, at different locations on the globe. This ranges from 0º (just above the horizon - a good example of this is the north pole during the winter) to 90º (directly overhead, at and near the equator).

When the sun’s rays are vertical (directly overhead), the Earth’s surface gets a maximum of solar energy. The more slanted the sun’s rays are, the longer they have to travel through Earth’s atmosphere before reaching the surface (becoming more scattered and diffuse as they go along).

The more scattered and diffuse the sun rays are, the less concentrated the solar energy is. Because of the fact that the Earth is round, the polar regions never get direct sunlight, and, during their respective winter months, they receive no sun at all.

The Earth travels around the sun, in an elliptical orbit. Because of its elliptical path, the northern hemisphere of the Earth is closer to the sun during one half of the year, and the southern hemisphere is closer during the other half of the year.

When one part of the Earth is closer to the sun, it receives more concentrated solar energy. This is the time of year that is referred to as “summer.”

But regardless of summer or winter, the 23.5º tilt of the Earth’s axis plays a larger role in determining the amount of sunlight striking Earth at a particular location. The tilting of the earth results in longer days in the northern hemisphere during one half the year, and longer days in the southern hemisphere during the other half of the year.

Areas such as the United States and Europe receive more solar energy between May and September - not only because days are longer, but also because the sun is almost directly overhead during this season. The sun’s rays are far more slanted during the shorter days of the winter months. Cities such as Denver, Colorado, receive nearly three times more solar energy in June than they do in December.

Diffuse and Direct Sunlight

As sunlight passes through Earth’s atmosphere, some of it is absorbed, scattered, and reflected.

The following is a general list of materials that cause the sunlight to be diffused:

* Air Molecules

* Water vapor

* Clouds

* Dust

* Pollutants

Sunlight affected in this way is referred to as diffuse solar radiation or diffuse sunlight.

Sunlight that reaches the Earth’s surface without being diffused is called direct beam solar radiation or direct sunlight.

The sum total of all diffuse and direct solar radiation in a given location is called global solar radiation. It is the total amount of sunlight hitting the Earth at any specific spot, both direct and diffuse combined.

Pollution and other atmospheric conditions (such as weather patterns) can reduce direct sunlight by 10% on clear dry days. They can reduce direct beam radiation by 100% on thick, cloudy days.

Note that the absence of direct sunlight does not imply total darkness, as some diffuse light will still get through.

Measuring Sunlight and Solar Energy

Scientists measure the amount of sunlight available in specific locations during the different times of year.

They are then able to estimate the amount of sunlight which falls on similar regions at the same latitude with similar climates and conditions.

Measurements of solar energy are normally expressed as “total radiation on a horizontal surface”, or as “total amount of radiation on a surface tracking the sun”.

In this last case, the assumption is that one is using a solar panel that automatically tracks the sun.

In other words, the solar panel would be mounted on a tracking device so that the panel would remain at right angles to the sun throughout the day.

This system is primarily used for industrial setups, when it is used at all.

Solar Energy Measurements

Radiation data (the amount of solar energy available at a given location) for solar electric (photovoltaic) systems is often represented as kilowatt-hours per square meter (kWh/m2). Direct estimates of solar energy may be expressed as watts per square meter (W/m2).

Radiation data for solar water heating and space heating systems is usually represented in British thermal units per square foot (Btu/ft2).

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Anna supports of clean living and the use of renewable energy in order to combat pollution and Global Warming, as well as the humanitarian and economic consequences of dependency on fossil fuels.

Visit Anna’s blogs, Solar Power and Alternative Energy, to find more information on solar power and alternative energy.

You can also find a wide variety of solar power equipment, solar battery chargers, portable solar power, solar water heating, solar powered weather stations, solar fountains, solar lights, home solar panels, and more, at her Solar Power Store.

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Thin Film Solar Panels

by Solar Power Guide on November 23, 2008


Thin Film Solar Panels are made up of a lightweight and flexible material which can be rolled up and easily transported. Thus, they are very useful as a source of portable solar power.

The following are some basic facts about Thin Film Solar Panels:

Any person who has ever used a solar-powered calculator has had “hands on” experience with Thin Film Photovoltaics. This technology has been with us for years, creating the solar cell strips which are used to power calculators

Thin film technology has now evolved to a point where we can mass-produce solar panels, through the use of machines not unlike printing presses.

The substance used to “print” thin film solar panels is called solar ink.

Solar ink can be made in any color. In fact, it is possible to design the inks in such a way as to make use of different parts of the light spectrum.

Solar presses print thin film solar panels called solar rolls. A solar roll is 13 inches wide and can be up to 2400 feet long.

A solar roll can be cut to the required size after the solar ink has been printed onto it.

The electrical connections in a solar roll are automatically welded in by laser. This takes away a lot of the time which is required to construct our “conventional” solar panels.

Once solar technology reaches a cost effectiveness, of $1.00 per watt, its prices will be competitive with conventional fossil fuels. TFPV is rapidly approaching this benchmark and could possibly beat this in the near future.

Solar ink can be printed onto fabrics, plastics and metals, allowing one to design solar panels for a wide range of products, each tailored to their specific needs.

Thin film photo voltaic solar panels are not as effective as solid solar panels. It’s the fact that it is so much cheaper and lighter than conventional solar panels, that gives it the “edge”.

The U.S. military is extremely interested in the development of thin-film technology, and spent 1.7 million dollars at one laboratory last year in order to facilitate the development of thin film photovoltaics. It’s interested in using thin film photovoltaics for troop communication devices and to reduce the heat signatures when troops using conventional generators.

Solar shades and tents are now available, using thin film photovoltaics, that provide up to 2kw of power. This allows them to operate laptops, communication devices, TVs and much more.

Thin film photovoltaic devices are now widely available on the consumer market. A good example of this is the flexible Brunton SolarRoll which comes in several sizes.

A thin film flexible solar panel weighing less than a pound is capable of recharging a laptop. Due to its flexibility, it can be rolled up and transported easily.

Thin film photovoltaics are also a realistic source of emergency power. This makes them a handy and economic addition to emergency preparedness kits and wilderness survival kits.

Current research on thin film photovoltaics is aimed at increasing the power output of thin film solar panels, should it achieve this goal there is a very good possibility that we will have solved the problem cheap clean renewable energy.

For more information on solar power, visit Solar Power and Alternative Energy.

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Information On Solar Power Systems

by Solar Power Guide on November 23, 2008


Photovoltaic cells—those black squares an array of which comprises a solar panel—are getting more efficient, and gradually less expensive, all the time, thanks to ever-better designs which all them to focus the gathered sunlight on a more and more concentrated point. The size of the cells is decreasing as their efficiency rises, meaning that each cell becomes cheaper to produce and at once more productive. As far as the aforementioned cost, the price of producing solar power components per watt hour has come down to $4.00 at the time of this writing. Just 17 years ago, it was nearly double that cost.

Solar powered electricity generation is certainly good for the environment, as this alternative form of producing solar power gives off absolutely zero emissions into the atmosphere and is merely utilizing one of the most naturally occurring of all things as its driver. Solar collection cells are becoming slowly but surely ever more practical for placing upon the rooftops of people’s homes, and they are not a difficult system to use for heating one’s home, creating hot water, or producing electricity. In the case of using the photovoltaic cells for hot water generation, the system works by having the water encased in the cells, where it is heated and then sent through your pipes.

Photovoltaic cells are becoming increasingly better at collecting sufficient radiation from the sun even on overcast or stormy days. One company in particular, Uni-Solar, has developed solar collection arrays for the home that work well on inclement days, by way of a technologically more advanced system that stores more energy at one time during sunlit days than previous or other arrays.

There is actually another solar power components available for use called the PV System. The PV System is connected to the nearest electrical grid; whenever there is an excess of solar energy being collected at a particular home, it is transferred to the grid for shared use and as a means of lowering the grid’s dependence on the hydroelectrically-driven electricity production. Being connected to the PV System can keep your costs down as compared to full-fledged solar energy, while at once reducing pollution and taking pressure off the grid system. Some areas are designing centralized solar collection arrays for small towns or suburban communities.

Some big-name corporations have made it clear that they are also getting into the act of using solar power (a further indication that solar generated energy is becoming an economically viable alternative energy source). Google is putting in a 1.6 megawatt solar power generation plant on the roof of its corporate headquarters, while Wal Mart wants to put in an enormous 100 megawatt system of its own.

Nations such as Japan, Germany, the United States, and Switzerland have been furthering the cause of solar energy production by providing government subsidies or by giving tax breaks to companies and individuals who agree to utilize solar power for generating their heat or electrical power. As technology advances and a greater storage of solar collection materials is made available, more and more private investors will see the value of investing in this “green” technology and further its implementation much more.

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Alternative Energy | Solar Cells

by Solar Power Guide on November 1, 2008


A solar cell is a device which changes sunlight into electricity. A more technically term for a solar cell is a photovoltaic cell.

The term “photo” derives from the Greek word for “light,” and the term “voltaic” comes from the word “volt” which means “electrical force.” A “cell” is a small receptacle or container containing electrodes which generate power.

Thus, a photovoltaic cell is a container that creates electric force, through light.

Whereas a solar cell can generate electricity from any light source, its intended use is the collection of solar energy from the sun.

How a Solar Cell Works

The solar cell works as follows:

Photons (which are particles of light in sun rays) hit the surface of the solar cell and are absorbed a semiconductor, such as silicon.

These photons (bits of sunlight) knock electrons loose from the atoms inside the semiconductor. The photons then push the electrons along, leaving a “gap” in the atom. Another electron is then pulled from an adjacent atom to fill the gap. And so an electrical flow is generated.

The simplicity of this is that one atom has an extra electron, and the other atom is missing one. This is referred to as a “difference in potential.” Nature, wanting to remain balanced, tries to even things out by pulling another electron from the neighboring atom.

A solar panel is comprised of a group of solar cells which are linked together to produce the desired amount of electrical energy.

A group of solar cells linked together can also be referred to as a “module.” Thus the terms “solar panel,” and “solar module,” are synonymous to each other, and essentially mean the exact same thing. “Solar panel” is the more common term, and “solar module” is the technical term.

One can use Solar Panels individually or one can link several together in order to generate more electricity. When a group of solar panels are linked together, it is called a “solar array”. The more solar panels are included in a solar array, the more power they produce.

Solar Power is a clean and virtually unlimited source of energy. I say “virtually unlimited” because the sun itself won’t last forever. But we won’t have to worry about that for the next few billion years.

Since solar power is a clean energy source which has been around for decades, one might wonder why its not used more. The answer to this lies partially in the cost of producing solar panels, as well as in the efficiency of the solar panels.

We are currently in the second generation of solar panel technology and verging on the third. A lot has changed since the first generation. Solar panels a are becoming a viable source of clean energy.

The solar cells of earlier times were relatively large and bulky compared to our current models. In view of the amount of energy and material required to produce them, and the amount of energy they actually produced, using solar energy was more costly than using fossil fuels. The only exception was in places where no fossil fuels were available, such as in space.

With the second-generation solar cells, we attempted to tackle this exact problem. We attempted improve manufacturing techniques so as to reduce the costs, materials and energy needed for the production of solar cells.

Recently, major advances have been made in the production of solar cells. These advances have reduced production costs.

One contribution in this area was the development of techniques to coat glass or ceramic materials with very thin layers of semi-conductive substances. This made it possible to produce solar panels using only a fraction of the semi-conductive material that was required earlier. The production of solar panels using this second-generation technology is referred to as “Thin Film Technology.” (See also Thin Film Solar Technology.)

Third-generation solar energy technologies are currently being researched and developed. The objective is to improve the power of solar cells even further (while keeping production costs to a minimum) in which case thirty to sixty percent of the sunlight hitting the panels will be converted into electricity. (Currently, solar panels convert only about twenty percent.)

But regardless of third generation solar technology, the second-generation solar cell is efficient enough to make solar technology viable - and a host of new solar-powered products have hit the consumer market.

Solar-powered calculators have been in use for a while now, we’ve all seen them. We have even seen a few other novelty devices hit the market. But its only in the last few years that solar devices have come into serious and practical use.

The last two years in particular have seen a virtual explosion of solar devices hitting the market. Solar flashlights (I’ve often wandered what use they were), solar-powered radios, and, recently, solar battery chargers.

One can also now find a wide range of portable solar chargers and panels, which are lightweight and easy to transport, yet capable of providing a decent amount of power in even the most remote locations. Solar chargers are becoming a standard part of wilderness survival kits and emergency preparedness kits.

All of this is a result of the developments in solar cell technology, and the coming of the Solar Age.

Learn more about solar energy at Facts about Solar Energy.

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Interesting Facts About Solar Energy And Earth4energy

by Solar Power Guide on October 30, 2008


Electric power is by far the largest sector, as well as the fastest growing sector of global CO2 emissions, and conventional wisdom worldwide says it’s impossible to eliminate emissions without significant damage to industrialized society. These power plants will prove otherwise, and will inspire others to build zero-carbon electric generation at scale, such as the earth4energy manual. Electricity generated by the plants will directly feed into the electrical grid system that serves APS customers. All APS solar power plants are financed in part by APS and participating customers who, as APS Solar Partners, pay $2.64 per month to have 15 kW hours of their electricity needs generated by solar power.

Solar electricity is produced by solar cells that range in size from one square inch up to ten square inches. A single solar cell produces a small amount of electricity. Solar electricity is one of the key technologies that can let us power our modern energy-consuming society in a carbon-neutral way. This may let us avoid the most drastic global warming induced climate changes that will affect our future generations, beginning with earth4energy. Solar electricity is the natural way to generate power for all or part of your boat’s onboard electrical needs. Systems can be configured to power emergency-communications, lights, instrumentation, navigation equipment, and even refrigerators.

Solar electricity can free you. But , what if there’s no sun for several days? Solar electricity will eventually become a major player in the world’s energy portfolio. The industry just doesn’t have the capacity to meet all demands right now.

  • It takes only about 8 minutes for solar energy to travel from the sun to the earth.
  • When silicon is taken from just one ton of sand, and used in photovoltaic solar power panels, that silicon can produce as much electricity as 500,000 tons of burning coal.
  • Nearly 200 years ago, a British astronomer by the name of John Herschel cooked food with solar power during an journey to Africa.
  • As early as 1921, the Nobel Peace Prize was awarded for experiments with solar power and photovoltaics. It was awarded to Albert Einstein.
  • A study by the U.S. Department of Energy (USDOE) showed that solar power conditions were close to perfect (99 percent) in San Francisco on June 14th, 2000. On that day, 100,000 customers in that area lost power. Solar power could have provided all they needed.
  • Another USDOE study showed that the roofs of California\’s city and county buildings, if covered with solar PV panels, could generate 200 megawatts of clean electricity! Cover California\’s school roofs with solar power panels, and you add 1,500 megawatts more to the state\’s peak power supply.
  • In California, covering every available commercial and industrial roof with solar power panels could generate all of the electricity needed in that state during the daytime.
  • California opened its first large solar power plant in 1982.
  • In the U.S., there are more than 10,000 homes that get their energy entirely from solar power.
  • Germany is making the best use of solar power, even though its climate includes many cloudy days.

Photovoltaic material, most commonly utilizing highly-purified silicon, converts sunlight directly into electricity. When sunlight strikes the material, electrons are dislodged, creating an electrical current which can be captured and harnessed. Photovoltaic (PV) systems convert sunlight directly into electricity. Today’s PV systems integrate easily with your home’s existing electrical system. Photovoltaic panels require an unobstructed exposure to sunlight to obtain their maximum efficiency. Most PV panels are tested to meet both electrical and environmental performance criteria.

Photovoltaic solar cells convert sunlight directly into electricity, explained by earth4energy. The simplest PV cells power watches and calculators. Photovoltaics is great for portability like for hermits out in the caves . You can have your own homebrew solar energy for free, how? Photovoltaic panel prices have steadily been dropping at 3-5 percent per year for the last decade or so. However, prices may not seem all that low to you, because in general the technology is getting better, so each panel is making more watts than those of a few years ago.

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Protecting The Environment By Having Home Solar Power Generation

by Solar Power Guide on October 28, 2008


It certainly makes a lot of sense in switching from conventional energy to solar energy as your primary source of energy to power up your home. In case you are still in the dark about the many benefits of solar energy then it is time to understand how home solar power generation can do the environment a lot of good, save you from paying high monthly electricity bills and also ensure that you have power even when there is a power outage in your locality.

Being Informed

All over the world more and more households are becoming aware of the benefits that home solar power generation provides, however the majority still have not been properly enlightened of this alternative power source. By being informed and informing others will help bring positive action to them understanding what home solar power generation is and it’s benefits.

For those that do know a bit about home solar power generation there is little need to convince them to switch over to using solar power because it (solar power) has a very enviable reputation. The sun has powered up the earth from the very earliest times and being renewable source of energy it will not run out on us in the foreseeable future. Even a tiny fraction of total solar radiation is enough to power up the entire world.

Since the beginning, solar energy has provided the energy to heat various things and will continue to do so which is why solar energy is the obvious alternative source of energy. By having home solar power generation installed even in simple ways such as having skylight windows, this gives a passive form of home solar power generation which is indeed very useful.

Another way to use solar energy for home solar power generation is through the use of active solar power using solar panels which are normally installed on the roof of the house or anywhere in the property where abundant sunlight is available.

A second use of home solar power generation is to use the power on water systems. In addition, laptops, many electronic devices as too cell phones are beneficiaries of home solar power generation. What’s more, the use of solar power has even extended to portable solar power systems which can be used to power up a laptop, or even an entire home.

The way it is, utilizing home solar power generation will help you save a lot of money and will ensure that you help in protecting the the environment and preserved it for your future generations. By using solar power your only cost will be for the solar equipment you buy and you will not have to pay for the recurring monthly costs of conventional energy, now isn’t that worth the effort of having home solar power generation?

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Solar How To: Discover The Benefits Of Solar Power

by Solar Power Guide on October 23, 2008


Many Solar How websites and books can be great sources of information on implementing solar power in your home. Search engines often require specific search words or phrases to help you find the particular information you’re looking for. Always be specific in online searches. Solar energy is quickly becoming a popular way for people to control their finances and power their homes. One of the most cost effective and reliable sources of alternative power is solar.

How does Solar Power benefit the population? Solar powered homes can actually reduce their utility costs to nearly nothing. Because of technological breakthroughs in solar energy, more companies are creating solar powered household appliances, such as washers and dryers. Solar panels are the most used, but another alternative is solar film for windows. Solar film on RV or yacht windows helps increase the amount of power transferred to the batteries.

Housing Associations

If you belong to a homeowners association, check with the association before making any major changes to the appearance of your home. Some homeowners associations have very strict guidelines for the homes in their jurisdiction. Alteration of a home usually has to be approved in advance. The same is true with building outdoor equipment. Housing associations often require explicit permission when building any type of outdoor structures, like a mobile solar panel.

Dependability

The photovoltaic (PV) cells used in creating solar energy were developed for use in space. PV cells power most of the satellites that orbit the earth, primarily because of their reliability. Maintenance is generally not required on the PV cells themselves, making them a very durable, reliable power source for an extended period of time. Most solar panels come with a minimum 25-year warranty.

Mobility

Solar power offers the ability to place appliances anywhere without being hindered by wires. Solar powered lights offer the freedom to place lights anywhere in your yard or on your patio without tripping on wires. Outdoor solar powered lights also usually have light sensors so they come on automatically when the sun goes down. Implementation of solar power on an RV or yacht could mean almost complete freedom from RV parks or marinas.

More Cost Effective

The cost per unit of solar energy is cheaper than the cost per unit from the power plant. The sun produces over 10,000 times more energy than the world uses per year. This free, renewable energy remains virtually untapped while we continue our dependence on fossil fuel. When your solar power source generates more power than your household is currently consuming, it will cause your utility meter to spin in reverse. You actually accrue credit at the same rate the company is charging you for electricity.

In addition to lowering your utility bill, rebates are available to help defer the costs of implementing a solar power system. Some rebates cover as much as 30 percent of the total cost of the system. An investment in a residential solar power system also makes the home owner eligible for a federal tax rebate of $2,000.

Less CO2 Pollution

Large amounts of CO2 are created by fossil fuels. CO2 is often considered the largest cause of global warming. The utilization of solar energy reduces our consumption of fossil fuels. Less dependence on fossil fuels would lead to fewer CO2 emissions and reduce the effect of global warming. A single 2.5 kilowatt solar generator reduces the amount of CO2 emissions by a tremendous amount. The affect is similar to planting an entire acre of trees. The amount of CO2 reduced is the same amount a passenger car driving almost 8,000 miles per year emits.

New Technological Breakthroughs

Every time a new technology is introduced, it is considered impractical or expensive. As that technology is introduced and accepted by the general populace, more people push for it. When more people push to see the technology become more prevalent and affordable, more financiers invest in it. Some of the most recent breakthroughs in solar power are solar powered washers, dryers and kitchen appliances. Solar Power has the ability to change the shape of the future of the entire planet. The technological possibilities are nearly endless.

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Information About Finding Earth4energy Reviews

by Solar Power Guide on September 28, 2008


Alternative energy refers to energy sources which are not based on the burning of fossil fuels or the splitting of atoms. The renewed interest in this field of study comes from the undesirable effects of pollution (as witnessed today) both from burning fossil fuels and from nuclear waste byproducts. Alternative energy describes energy sources used as an alternative to fossil fuels. Generally, it indicates energies that are nontraditional and have low environmental impact. Earth4Energy will you help solve part of the problem on your own. Alternative energy is still emerging as a business and it is not yet clear which companies have optimal solutions for the future. This makes the alternative energy sector ideal for ETFs, which are good at spreading risk among various companies and various technologies.

Alternative energy is becoming more prominent now, and environmental concern is no longer for the tree huggers. People are starting to wake up and see that our planet is slowly being destroyed by pollution and a lack of responsibility. Alternative energy is cleaner. There may be future technologies for the transformation of coal to a clean source of energy. Alternative energy sources must be developed so that the world can have reliable, efficient, environmentally friendly ways to run their cars, power their manufacturing plants, and heat and cool their businesses, schools, and homes. This Earth4Energy review will explain more about the manual. Alternative energy technologies such as photovoltaics, wind turbines or biofuels attempt to harvest this natural abundance of power.

We need to reduce the amount of carbon in the atmosphere, not slow the rate at which we increase the amount. Solar energy has been making big waves over the last few years. As energy costs rise and consumer awareness heightens over environmental issues, many homeowners are making alternative energy choices - from buying hybrid cars to installing home wind generators. Solar benefits are utilized through windows and pumps, and fans are used minimally.

Solar panels can provide plentiful power during the long hours of summer sun, but wind generators should be added to help support the system through the winter months. These Earth4Energy reviews will help you learn more about the guide. Solar energy continues to have potential, but is not yet economically viable, nor will it be able to supply more than a small fraction of our energy use.

Wind turbines may be killing bats without touching them. A new study suggests that the localized drop in air pressure caused by the whirling blades is causing the delicate lungs of bats to burst. While environmentalists previously worried about birds getting slashed by the turbines’ blades, researchers realized a year ago that bats are more at risk from the turbines. Windmills may have been around for almost 1500 years, but it was not imagined that wind power would become affordable enough to compete with fossil fuels. In fact, many utility services around the world offer wind-generated electricity at a premium of 2 to 3 cents per kWh.

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Solar energy usage around the world

by admin on September 21, 2008


german solar park

german solar park

Increasingly, the world is recognizing that we need to be investing in alternate forms of energy. While the UK has long been a leader in the use of solar power, other countries are realizing the benefits of using this very sustainable form of energy. The use of the sun’s energy is gaining much wider acceptance and application in Europe and Japan. Buildings are being constructed with photovoltaic panels built in as skylights, walls and atriums. There are high rises in Japan with outer surfaces completely made of solar absorbing material. The Germans prefer their solar units designed in the form of a power generating container shaped like a massive shoe box. These structures are large enough to contain nine buildings which are powered by the energy that is produced.

Solar power has also been adapted by the military for application in the field. They have developed lightweight portable systems that are used to bring electricity to remote locations. Modern solar equipment is designed to minimize light reflection which helps in reducing the chances of being spotted by the enemy.

Solar energy has been adapted for humanitarian applications as well. Hybrid systems are installed in medical clinics in third world countries. These power plants make use of back up generators in conjunction with photovoltaic cells so that the facility will operate purely on solar power on sunny days, with the back up batteries charging. During the night, and on cloudy days, the generators will kick in. This makes it possible for needy people in remote regions to get adequate medical care.

In remote places of India solar power systems were installed in homes. The introduction of electricity into these areas also brought the advent of television. These people discovered that they were part of a much larger world when news of global events came into their living rooms. These villagers also realized profound changes in their lifestyles. Suddenly there was light available for studying and doing other tasks after dark where once they had to get all of these things accomplished before the sun went down.

The whole world has seen changes in their work habits in the area of agriculture due to solar energy. One example is power pumps used for irrigation. There are many other areas of use for solar power in farming, ranging from lighting for the interior of barns to running a conveyor belt for hay.

In South Africa, where the potential for solar use is great, scientists are constantly working to develop better energy sources. The old silicon based technologies are giving way to cheaper and more efficient solar energy systems. This could be a new age for Africa to transition from being the “dark continent” to being a “continent of light.”

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The difference between direct and indirect solar power

by admin on September 19, 2008


seville solar power tower

seville solar power tower

Solar power is abundantly available, but the potential for its use has barely been explored. The drive to tap into the sun’s energy by direct means is a fairly recent phenomenon. However, people have always used indirect solar power. The difference between direct and indirect solar power is the number of changes the sun’s energy has to go through to become useful.

The sun is a primal source of nutrition and energy for our planet. Its energy impacts everything from weather patterns to the food we eat. At the most basic level it is at the source of all our energy. Photosynthesis of sun light is critical in the growing of plants, which in turn provides food for the creatures of the earth, including humans. Mankind makes use of the plants and animals for many purposes including the source of other forms of energy. The development of bio fuels would be impossible without the sun’s energy. The fossil fuels we use in the present age is a product of animals that have long been extinct. The sun helped in keeping these animals alive and it also played a role in the decomposition process that made crude oil out of them. These are examples of the indirect uses of solar energy.

The direct use of solar power is when the sun’s energy goes through only one change to become useful. We are just beginning to explore the variety of ways to tap into this resource. Fibre optics is a developing technology where cables can be mounted on the outside of buildings to transmit the sun’s energy for lighting on the inside. Thermal collectors are another way of harnessing the energy of direct sun light. The dark surfaces on these units are capable of absorbing the sun’s heat energy which in turn can be used in a fluid circuit. This is the principle involved in the use of solar panels or photovoltaic cells. This technology is quite effectively used in the building of spacecraft. While in orbit, there is ample sun light available which can be collected and used for many applications aboard a space module. This is very beneficial because the storage capacity for fuel on a space craft is limited.

The sun is our most basic source of energy and it is sustainable. We have benefited from solar power since time began and it hasn’t come close to running out. The sun belongs to everyone. We don’t have to ask for anyone’s permission to tap into its resources. We don’t have to go exploring for it and we don’t have to dig giant holes to find it. It is simply there for us to use.

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