How to keep your roofs cool?

White painted roofs have been popular since ancient times in places like Greece. Similar technology can be easy to adapt to modern homes and other buildings. | Credit: ©iStockphoto/PhotoTalk A cool roof is one that has been designed to reflect more sunlight and absorb less heat than a standard roof. Cool roofs can be made of a highly reflective type of paint, a sheet covering, or highly reflective...

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PASSIVE SOLAR HOME DESIGN

This North Carolina home gets most of its space heating from the passive solar design, but the solar thermal system (top of roof) supplies both domestic hot water and a secondary radiant floor heating system. | Photo courtesy of Jim Schmid Photography. Passive solar design takes advantage of a building’s site, climate, and materials to minimize energy use. A well-designed passive solar home first...

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Record-Breaking Solar Cell Points the Way to Cheaper Power

Panasonic reveals a design that surpasses a 20-year-old mark for solar cell efficiency. For roughly two decades, the most efficient silicon solar cells in the world used a structure invented in Australia at the University of New South Wales. This week, in a packed conference room at the IEEE Photovoltaic Specialists Conference in Denver, Panasonic gave details for the first time about a new structure that allows silicon solar cells to surpass that efficiency, setting a new world record and possibly...

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How do solar cells work?

Solar (or photovoltaic) cells convert the sun’s energy into electricity. Whether they’re adorning your calculator or orbiting our planet on satellites, they rely on the the photoelectric effect: the ability of matter to emit electrons when a light is shone on it. Silicon is what is known as a semi-conductor, meaning that it shares some of the properties of metals and some of those of an electrical...

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Solar Cell Structure

A solar cell is an electronic device which directly converts sunlight into electricity. Light shining on the solar cell produces both a current and a voltage to generate electric power. This process requires firstly, a material in which the absorption of light raises an electron to a higher energy state, and secondly, the movement of this higher energy electron from the solar cell into an external...

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Solar cell

A solar cell (or a "photovoltaic" cell) is a device that converts photons from the sun (solar light) into electricity. In general, a solar cell that includes both solar and nonsolar sources of light (such as photons from incandescent bulbs) is termed a photovoltaic cell. Fundamentally, the device needs to fulfill only two functions: photogeneration of charge carriers (electrons and holes) in a light-absorbing...

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solar energy and electricity analysis by IER

The power of the sun’s radiant energy is what makes life on earth possible. Efforts to harness it in concentrated form and direct it to man’s ends have long been a human pursuit. The current state of technology generally uses two approaches: solar thermal collectors and the more complex design and manufacture of photovoltaic cells. The collection of thermal radiation from the sun is relatively...

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Advantages and 5 Disadvantages of Solar Energy

Solar energy is derived from the sun’s radiation. The sun is a powerful energy source. The energy that it provides to the Earth for one hour, could meet the global energy needs for one year. We are able to harness only 0.001 percent of that energy. Below you can read about some advantages and disadvantages of solar energy. Advantages of Solar Energy 1. Renewable Energy Source Solar energy is a...

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SOLARCITY'S ROOFTOP PANELS ARE ABOUT TO GET WAY, WAY BETTER

SOLAR CITY HAS A BIG ANNOUNCEMENT THAT MAY HELP RESHAPE THE ECONOMICS OF RENEWABLES. Solar City, the solar energy company that Elon Musk helped found, has been on a tear over the past several years, adding thousands of employees, expanding across the country, and building what will be North America’s largest solar panel manufacturing facility in Buffalo, New York. Now it has a new...

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Cost of Solar Power

hello dear viewer, Today i am going to write about the cost of solar. On average the total cost of solar installation can be between $15,000 to $29,000 for average sized systems sized between 4kW and 8kW.2 Sunrun solar lets you get started for as little as $0 down and helps you lower your electric bill. If you want to own your system, we do that too. If you choose to buy your system, the graph...

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Solar Technology-greenTechnology

Solar Energy: Past, Present and Future The sun is the largest energy source in the solar system. In fact, more energy from the sun hits the earth in one hour than the entire world uses in one year! And every living thing on earth, even microbes deep in the blackest reaches of the ocean, depend on the sun for life. Solar energy technology harnesses the power of the sun for human use, but we’ve only...

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BENEFITS OF SOLAR ENERGY

What is solar energy? Solar energy is energy which is created from sunlight, or heat from the sun. Solar power is captured when energy from the sun is converted into electricity or used to heat air, water, or other fluids. There are currently two main types of solar energy technologies: solar thermal: these systems convert sunlight into thermal energy (heat). Most solar thermal systems use solar...

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Alternative Energy(solar and wind energy)

Everyday, the world produces carbon dioxide that is released to the earth’s atmosphere and which will still be there in one hundred years time. This increased content of Carbon Dioxide increases the warmth of our planet and is the main cause of the so called “Global Warming Effect”. One answer to global warming is to replace and retrofit current technologies with alternatives that have comparable...

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