‘science’ Tagged Posts

Considerations When Mounting Solar Panels

After you purchase your solar panels, you will be faced with some decisions about their installation. How will your solar panels be mounted? What pa...

 

After you purchase your solar panels, you will be faced with some decisions about their installation. How will your solar panels be mounted? What parts will you need? If you are like me, then no matter which direction you choose the system should be reliable and secure.

A popular method is to mount one’s solar panels on top of their roof. It is a simple and convenient solution, and so most folks attach their solar panels this way. Most often these mounting parts can be purchased right off the shelf.

We would like to point out a couple issues with mounting solar panels on the roof, however. They are things to keep in mind for folks who live in northern climates, or who desire more optimal performance.

The first issue we encountered was dealing with snow. Snow storms are common in my neck of the woods, and sometimes there is snow pack all Winter long. Whenever there is the slightest amount of snow fall, the solar panels must be cleaned. Snow covered glass will severely inhibit their ability to produce electricity.

In the mountains of Washington and Colorado, we have been working on a solution. We are designers and craftsman who desire convenience and performance with our own home based solar power systems. And like everyone else, we don’t want to spend an arm and a leg. We call this solution the Rotek system.

In a Rotek installation, the solar panels are mounted on a ground based structure instead of the roof. This provides the clearances for adjustability, so that we can rotate the solar panels in any way. With this in place we can make seasonal adjustments to match the Sun.

In the Winter is when this adjustability can be a big help. The solar panels can be pitched more steeply or rotated toward the ground (negative tilt) to keep the snow off the surface. It is also good for giving the glass an occasional cleaning.

Whether for one snow storm or for a period of weeks, as long as there is snow on the ground you can leave your solar panels at negative tilt. As we have all witnessed, snow pack is highly reflective. Your system will continue to receive lots of beam radiation despite this abnormal tracking angle.

The second big issue to consider is heat. As our roofs accumulate heat, they will increase the operating temperature of a roof mounted solar panel. Performance tests have shown that higher operating temperatures will reduce the solar panel’s discharge current. This lost current output can be as high as 2 or 3 amps depending on the unit, which correlates to better than 20% energy lost against baseline operation.

Remotely mounted solar panels with Rotek system will dissipate heat, run cooler, and give you better performance. This is because of fresh air circulating on the back end, instead of a warm insulated roof. This reduced operating temperature will also decrease wear and tear and help increase the longevity of your system.

So now that the decision is made to install your solar panel system, you must choose a mounting configuration. The roof mounted options are simple and in many cases a good choice. For those who want a little more performance and design flexibility, the Rotek system is a reliable and inexpensive alternative worthy of consideration.

Walter Hull is a mechanical engineer with expertise in solar power systems. For a limited time you can get his free report to solar power from your own yard.

Thermal Collectors and Thermal Solar Power Systems

 

We use the words thermal solar power to describe any system designed to convert solar radiation into thermal energy. It is one of the major players in the solar power market and has huge untapped potentials.

The uses for thermal solar power are widespread and varied. Just think of any process which could utilize heat. This could range from something simple such as hot water heating, to more sophisticated designs involve stirling engines or industrial grade steam.

For most folks, thermal solar power will be limited to heating up a hot water tank, or storing heat for the workshop or house. These systems are inexpensive to incorporate, especially when designing a new home.

There are other good uses for thermal solar power which we expect to increase in years to come. One is pebble bed heat exchangers, which act as a thermal storage bank for converted heat. This gives us some system capacity and operating flexibility.

Pebble bed heat exchangers can be used in a variety of ways. They can be wall mounted units, or embedded in the floor. They can provide the heat source for everything from a family room, to a workshop, greenhouse, or dry sauna installation. They have good aesthetic qualities, being composed of natural materials, and can be incorporated in an attractive way into any home.

The typical operating temperature for most thermal solar power systems will be between 100F and 180F. In good solar climates these temperatures can be easily achieved with popular off the shelf equipment. With more specialized equipment we can go in excess of 250F, and with high performance industrial equipment over 700 degrees is possible. These high performance systems are usually for making steam, but incorporating them into other processes is also possible.

Solar collectors are designed to achieve a certain operating temperature. Flat plate and evacuated tube collectors are very effective at lower system temperatures. Parabolic trough and concentrating collectors are required for higher system temperatures. The solar collector is quite possibly the most important component in your thermal solar power system. It is the thermodynamic engine and should be selected thoroughly and carefully.

The lifeblood of the thermal solar power design is the circulating fluid. The circulating fluid is heated in the solar collector, and then pumped to all the system users. This fluid is typically oil, glycol, or water which is matched to the system temperatures and equipment in use.

Anyone interested in energy independence and self-sustainability should thoroughly investigate thermal solar energy. Most systems are fairly simple and rank very well in affordability. If you live in a climate with a good reputation for Sun, then there is a pretty good chance you could be using a thermal solar power system of some form.

Thermal solar power is a major branch of the solar market, with much room to grow in years to come. Solar hot water and pebble bed heat transfer systems are two good applications for most homes. We can store heat in our floors, a sauna, a greenhouse, or even use it to air dry our clothes. The possibilities for thermal solar power are as far as the imagination can go. With a new age emerging toward more natural lifestyles and self-sustainability, we expect to see several new designs in years to come. Everything begins first with harnessing the energy of the Sun.

Walter Hull is a recognized expert in solar power systems. For a short time you can get his free guide to solar power from your own backyard.

How Do Solar Panels Work?

 

If we are serious about decreasing environmental pollution, then solar energy should be a part of the equation it isn’t a part of the problem, so it must be part of the solution. It’s recognized as an “alternative energy source”, as it isn’t widely used as a main source of power for very many people. It’s expensive to produce solar panels, and in today’s world, calculators and lawn decor are two of the most popular solar powered gadgets used by the mainstream. So, the burning question that could maybe help solve our planet’s current dilemma is, how do solar panels work? How does a panel harness the sun’s energy and turn it into electricity?

The basic concept of how solar panels work is that they’re made from special materials that are capable of harnessing the sun’s energy and converting it into electricity. Electricity that powers electronic devices that we use in our everyday lives. But there’s a little more to it than that.

A budding technology used today for solar panels is photovoltaic (PV) electricity. It involves the use of specific materials that convert solar energy into electricity. The electricity can be used right away or it can be stored using DC batteries. Either way, we’ve got power!

These materials have been recently developed and they release electrons when prompted by sunlight. Another name for a photovoltaic panel is a “direct energy conversion device”. All of these effects take place on an atomic level without any moving parts.

Photovoltaic panels used to be restricted to space age technology. Satellites and space stations used them for their reliable and continuous conversion of solar power. Outer space has an advantage when it comes to solar energy since the sun’s radiation is, at the very least, 50% stronger out there than here on Earth.

People who live more than a mile from an electrical grid are better candidates for solar power use especially those in residential homes. It’s significantly more expensive to install power transmission cables than it is to install a solar panel kit. If you fit this criterion then solar energy to power your home is a smart way to go.

But the question hasn’t been fully answered yet”how do solar panels work?”, and to better understand this we should know what solar energy is. Solar energy is made up of two kinds of radiation. The first and the best kind for solar panels to function is called “beam radiation”. Imagine you are laying on the beach in the middle of June on a bright sunny day. Feel the sun’s rays beating down on your skin. The energy you feel on your skin is “beam radiation”. A clear blue sky is a good day at work for a solar panel, but that solar panel needs to be properly placed in order to absorb the most direct sun rays as it can to achieve optimal results.

The other kind of radiation from the sun is called “diffuse radiation”. This shouldn’t be relied on for the sole energy to be absorbed by your solar panels. This is what we feel on an overcast, cloudy day or if chilling out under a shady tree. To rely on this type of energy from the sun as your main source of sunlight is far from practical.

So, with this being understood, a bright and sunny location is key for solar panels to work effectively. Beam radiation is very important and most of Western America fits this bill. However, northern climates and coastal states pose a bit of a challenge since typical weather there consists of a lot of clouds and rainy days. Those regions aren’t prime candidates for 100% solar reliance.

Solar panels are versatile in the sense that they can be set up to meet specific needs. 12 volt, 24 volt, and 48 volt DC systems are the most widely used. 12 volt solar panels can live well over 20 years and fall in the range of 12-14% efficiency.

Solar power is still “alternative energy”, and part of that is due to its high cost to produce. They’re so expensive because they are made of supremely pure silicon semi-conductor materials. New materials are being explored and they’re geared toward lowering production costs, making solar energy more readily available to the general public. Cadmium Telluride based solar panels are one of the new technologies being explored, and if these are successful materials then solar panels should become more affordable for the average citizen. This is great news for the environment as more and more people convert to solar energy, the atmosphere can begin to heal.

You’ll want to assess your weather patterns as well as your local utility rates before making a final decision as to whether or not to install a solar panel system at your residence, but the benefits to the environment truly outweigh the monetary aspect. The decision is much simpler if you intend to use solar merely as a backup plan. Energy independence is a common goal for all. It helps the environment in so many ways that simply can’t be ignored.

For a free report on how do solar panels work get more information here.

How Electricity Is Produced From Wind Energy

 

Wind energy has been used for many years as individuals have used wind power for sailing, wind mills for manufacturing and pumping water and more recently conversion into electricity using wind turbines. Wind power is a renewable energy that is considered a good option instead of burning fossil fuels. Of all the renewable energy sources it is the most efficient and you only need a light breeze to produce electricity.

The very first uses of wind for energy was in the form of wind mills and sailing as people have been using wind for more than thousands of years to propel ships. Windmills have also been used for many years for milling grain as well as pumping water for irrigation. These irrigation windmills was the main reason that farming and ranching could occur in the US, as there are vast stretches of land that do not have ready access to water.

The very first usage of wind to create electricity occurred in 1888. The first wind turbine was used to create hydrogen in the 1890s but it was soon converted to producing electricity. Small wind turbines are used to provide power to rural buildings and today there are larger wind farms that are being used to produce electricity for large networks. What is known as the modern wind industry really began in 1979 when wind turbines began to be regularly produced.

Wind occurs because the surface of the earth is not evenly heated, as the poles get less sunlight than the equator. This causes cooled and heated air to move which in turn produces wind. It is projected that the amount of power that could be harnessed form the wind is more than the human population currently uses. So just think about having almost cost free power.

The amount of power that is generated by the wind is dependent on the speed and as the wind speed doubles the amount of power produced increases eight fold. However there is a cap as wind turbines can only go so fast and generate so much energy. You do not need high winds at all time though as a lot of energy can still be produced with 15 mph breezes. As such, wind power is a valuable method for alternative energy.

The main issue with wind energy is storage as wind power cannot be dispatched at different times but needs to be used immediately. Many companies have looked into different types of batteries, storing it within the energy grid and even hydroelectricity. Many times surplus energy from domestic wind turbines are fed back into the electrical grid and the energy company will purchase this energy and you will receive electricity credits.

A wind turbine used to collect the power of wind will contain a rotor shaft, gearbox and brake assembly. Generally within a wind farm the different turbines are interconnecting for power collection and communication networking. Wind energy uses induction generators to collect the power and change it to electricity.

The best types of generators are doubly fed machines as they will function when errors occur within the grid. You need to be aware of the power factor, dynamic behavior and frequency constancy when a system fault should occur.

Wind power should be thoroughly considered in order to promote a greener society. Educate your children to become future scientists by purchasing them science lab equipment.

What is Solar Energy?

 

The Sun is like a giant power station, making solar energy for us each and every day. Without this daily dose of solar power, Earth would not be even close to the same. Literally the difference would be like night and day.

Electromagnetic radiation is the technical term for solar energy. This radiation is emitted by the sun and is absorbed into Earths biosphere in many ways. Because of its widespread importance to the biosphere, solar energy plays a crucial role to our existence.

Electromagnetic (EM) radiation comes in many different wavelengths. We describe EM radiation based on its wavelength with Gamma rays being the shortest, and Radio waves the longest. Earths solar energy falls in the middle, composed of infrared, ultraviolet, and visible light waves. This is a good thing because all wavelengths between Gamma rays and Ultraviolet rays are harmful to humans and most other things on Earth.

Solar energy plays a primary role in all biological and thermal interactions on the Earth. With the presence of carbon dioxide, water, and solar energy, plants are able to produce energy through a process called Photosynthesis.

Solar energy is also the primary element that forms weather patterns. The Sun warms the surface of the earth, whereby wind patterns develop. Solar energy is absorbed in the oceans, and this helps form the currents. Evaporation caused by solar energy is what fundamentally leads to clouds and thunderstorms.

And so it is no surprise that solar energy is at the root of almost all physical processes that occur on Earth. Without this valuable resource life as we know it would not exist.

Each and every day we should all be giving thanks to the Sun. It may be the most important element to our existence which we take for granted. Imagine if one day we woke up and there was no Sun? It would be like losing power at your home, but a million times worse. Probably most people would fall into an immediate panic.

Thinking about it like that, we should probably all wake in the Morning and give thanks to the Sun. It is the single item in our existence we take most for granted. What if the Sun disappeared for one day? Just think of the mayhem and chaos this would create. And think of all the solar energy that would be lost all over the world.

With the recent advances in materials and industry, we now find ourselves with some new inventions for working with solar energy. It is now possible to make electricity directly from sunlight in a photovoltaic device. We can harness solar energy in absorption and concentrating collectors and store the heat.

The modern home can benefit greatly from solar technology, and the implementation has only just begun. Whether retrofitting your house, or building a new home, harnessing solar energy can bring tremendous savings and true energy independence. As a side benefit, we can feel good about lessening our impact on the environment.

With all the choices on the market its hard to know exactly where to start. What kind of benefits can be obtained by harnessing solar energy? How practical is it, and how much money can be saved in the long run? The truth is, in utilizing solar energy everybody will have a different idea and different purpose. Its best to begin with a discussion of the various technologies and their rewards, and allow the reader to form his own concepts for moving forward.

To learn how to use solar energy as a budget source of electricity for your home get Walter Hull’s report on simple solar power from your yard.

Present-Day And Future Alternative Energy Sources

 

The major past energy sources have included petroleum and coal. With the sharp increase in energy prices, depleting non-renewable sources of energy, the increase of green house gases impacting global warming, the future of using alternative ‘green’ sources of energy looks bright. Governments around the world are feeling the pressure of consumer demands for alternative renewable energy sources that will not harm the environment.

Wind Power is one method of producing ‘green energy’ that is becoming popular all over the world. Wind turbines are used to create power. Wind turbines can be placed wherever there is sufficient amount of wind. The higher the number of installed wind turbines, the more electricity will be produced.

Solar energy is one alternative energy source that is expected to see an increase in use in the future. This form of energy makes use of the sun for power and heat. Solar panels harness the power of the sun without polluting the planet and atmosphere. The solar panels power generators provide the electricity. The solar panels are installed on the roofs of residential and commercial buildings. In the future, larger solar panels will be built that can power hundreds of thousands of homes Solar energy requires does not require any other energy source to operate and it is free of pollution. Sunlight can be harnessed as usable heat or converted into electricity using photoelectric cells, solar panels, or using synchronized mirrors called heliostats that follow the sun as it moves. Methods for using solar power to replace a gas-powered engine by heating hydrogen gas in a tank have also been developed. There have been positive results with powering a generator.

Hydro Power is another alternative energy source with proven results. The flowing water drives the turbines which produces the energy. The energy created is dependent on the strength and force of the water flow because rapid flowing water drives the mechanisms that help with producing electricity. The current is then sent through a transformer where the electricity is transmitted over power lines. This is an eco-friendly form of energy and in the future, it is expected that more hydro power stations will be erected where there is a suitable water supply.

Current technologies for new renewable green energy sources, particularly solar power and wind power, are proving to be quite promising for the future. As well, Geothermal Energy which is heat energy extracted from the earth to create steam to power the generators that produces the electricity, is another potential future large energy source. There is also much research and development going into Nuclear Fission. Salinization of water at river estuaries as an energy supply is another possible source of alternative energy because many experts suggest that it will be millions of years before there is any impact. Nuclear fusion and artificial photosynthesis are two other energy technologies currently being researched as possible future energy sources.

Much of the traditional sources of energy are becoming unsustainable making new greener sources of energy the wave of the future. Many corporations, ‘green’ entrepreneurs, and governments are investing in the future of the planet and its inhabitants by investing in alternative renewable energy sources. An investment in ‘green’ energy means a future of low energy costs and a greener sustainable environment.

Alternative energy sources don’t have to be hard to come by. If you want to experiment with green energy, look up for more resources online. There is a huge repository of information waiting for you there.

Solar Power – The New Energy Source

 

If you want to go to solar power for your home or business then now may be the time to do it. Though you will probably still have quite a bit of out of pocket expense, if you live in the United States then you will most likely qualify for tax incentives to offset some of your cost. You should keep in mind that these systems are expensive but they may save you a lot of money as well.

Any time electrical energy is generated by the sun it is considered to be solar energy. A special system will usually be needed to harness this energy to run electrical devices. Besides the actual solar panels you will usually need a converter box that will be hooked up to your electrical pole. For safety reasons a professional may need to install these. Your electrical company will need to give permission as well.

The do it yourself kits look like something I would love to try if only as a science project for my son. These promise that anyone can do this but I have a hard time believing I could set up a system like this. Any time electricity is involved there is also a certain amount of risk. Fires, explosions, and electrocution all come to mind.

Most people have come to understand that fossil fuels simply can’t last forever. In the next few years we may see a great reduction in the amount of fossil fuel used in all countries. Solar power is only one of the alternatives being considered. Starting now can help you prepare for the future and save a lot of money on electricity at the same time.

You don’t even have to worry about cloudy days. Solar energy work with your regular power source to make sure you always have electricity. They combine to ensure you stay up and running weather it’s your home or business. If the solar energy is low it simply and automatically switches to your alternative energy source.

Do it yourself kits save a lot of money over professional installation but the entire process sounds fairly complicated. One site even mentioned the need for permits. You should check with your local power company and see what rules apply in your area.

They now have a wide selection of products that run on solar power without the need to install a special system. They have even made cars that will run on solar energy. One of the best products I have seen are outdoor lights. These take away the need for cords and are easy to install and move around.

If you are thinking about going with solar energy then check all local laws regarding this and at least get professional advice before you begin. Keep in mind that any time you work with any type of electricity proper precautions must be taken and safety should always be your first priority.

Solar energy will no doubt be more widely available in the near future. Prices may come down a lot in years to come. If you can afford to go with this now then you could save a lot of money. One day they may even have solar power companies that actually charge us for solar power.

Solar power provides an efficient and environmentally friendly source for energy. In order to promote a greener society, wind power should also be considered as an alternative option.

Hot Water Heaters and the Many Kinds

 

While many people consider the up front cost of hot water heat system, they should pay just as much attention to the impact that one may have on their monthly heating bills.

Let’s take a look at a few of the different types of options available on the market. Hopefully one of these will appeal to you more than others, leading to a successful purchase that satisfies your needs.

Most people will generally use gas water heaters for their needs and the reason for this is that the up front cost associated with buying these is generally the cheapest.

What people forget about is the fact that gas costs can add up to a lot of money over time, as any water heaters will regularly consume their supply of gas before needing more.

If that doesn’t appeal to you, it may be in your interest to look into some of the many electric hot water heating systems offered up for sale. On the plus side, you won’t have to worry about refilling it with gas. Then again, you should expect a higher energy bill due to the electrical consumption involved here.

Yet another alternative is the solar powered hot water heating system. To anyone concerned about the environment, these will be the best heating devices for the purpose. On the other hand, they can cost two or three times the amount of other units.

If this is out of your price range, the on demand hot water heater might be the perfect solution for you. Your energy costs will be reasonable since the unit only runs when you want it to, though without advance planning, you may end up having to wait for your water to heat.

As it stands, these are the best possibilities in the world of hot water heating systems. Figure out your objectives, and begin looking into the process of finding the right fit from there.

While we’ve gone over the basics of the different types here, further reading about gas hot water heaters can be accessed by those looking for more information.

Analyzing The Popular Types Of Hot Water Heating Systems

 

We all enjoy the concept of getting readily usable hot water inside our houses, and it is the presence of hot water heating systems that makes this attainable.

Whatever your needs may be, the use of water heaters inside homes is something that you’ll undoubtedly need to think about if you’re getting into a recently constructed house, or simply wanting a replacement heating system for water.

There are some totally different varieties that you will have to decide on, and I’m going to go into detail regarding three of the foremost popular types. Hopefully you’ll confirm which one of them is most appropriately fitted to your environment and needs, prompting a smart purchase.

If you’re similar to most homeowners, you’ll just wish to buy a gas water heater. There are a number of reasons that people opt for gas, and perhaps the biggest one has to do with the fact that gas water heating systems are the cheapest to buy.

On another hand, they’re generally the hardest to take care of due to the fact that they will need constant gas refills in order to keep them active.

If you’re someone who values ease of use, then you would possibly want to go with an electric hot water heating system. The explanation for this relates to the fact that all you’re required to do is leave it plugged in, in which case the unit runs on its own, providing you with very readily available hot water whenever you want it.

A final possibility that appears to grow in use year in and year out is the solar water heater. This method is the best energy efficient means of going about your water heating, and you can rest assured that you won’t need to worry about expensive electrical expenses.

Despite this, this hot water heating system will typically wind up costing lots more money than the other two models that we’ve gone over.

Learn more facts about gas hot water heaters at this author’s site.

What Type Of Solar Energy Is Right For You?

 

Solar energy is a clean form of energy production, which does not pollute the environment. The promise of cleaner energy and advancements in green technology has allowed solar energy research and production to take a front seat in modern energy production.

Thermal conversion and photovoltaic conversion are the two methods of solar energy used today. Using the heat of the sun to make electricity is known as solar conversion. Specialized material that can directly turn sunlight into electricity is involved in photovoltaic conversion.

As you would expect, sunlight is required to use solar thermal conversion to generate electricity. Solar energy is a type of energy This method utilizes reflecting surfaces and mirrors to amplify the amount of heat that can be generated. (thermal). If you have ever starting a magnifying glass fire, than you were using solar energy. You are able to create a very small space of very intense heat using a magnifying glass. Actual solar cells used to store heat use this method to superheat liquids that produce steam. Steam is created, which in turn moves a turbine that converts the energy into electricity.

Photovoltaic Conversion essentially means light that is converted to electricity. Photovoltaic cells usually consist of panels, which contain two layers of different materials. One layer becomes positively charged and the other negatively when light hits them. Very much like a regular battery, which has a positive end and a negative end, when a wire connects the two ends, they produce an electric current. When you expose the two layers inside a solar panel to direct sunlight, electricity is created.

The efficiency of a single solar cell is determined by its exposure to direct sunlight. Both time and intensity of sunlight will play a factor.

Solar cells are used to generate electricity for a variety of things, such as cell phones and entire communities. Solar power has the advantage of portability while traveling or camping, not to mention it also very environmentally friendly.

As stated earlier, anytime someone uses a handheld or lighted magnifying glass to get a fire going, have used solar energy.

The devices offered today are more efficient and effective then ever before. The use of solar power is very promising for our use now and into the future.

Want to find out more about using the sun to create your own solar power with a magnifying glass, then visit Julie Manther’s site on how to choose the best magnifiers and magnifying mirror for your needs.

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