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Tuesday, September 9, 2014

Solar Power, DIY Solar Power Training PV PHOTOVOLTAIC Harbor freight Fr...

DIY solar power is easy with this Harbor Freight DIY solar panel system is a great off grid project for anyone interested in a do it yourself solar potion.
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$149 (now) solar panel sysytem in action.

This easy system is affordable and there is no need to take out a 2nd mortgage:-)


Solar FREAKIN' Roadways! It's the roadway of the future!

It's the roadway of the future!

Sunday, July 14, 2013

What are solar panels & Worth It ?

How does the solar subsidy work? Solar panels save the typical home £90-£180/year in electricity. But the real boon's that the Government guaranteed for 25 years you'd get a high 'feed-in tariff', ie, be PAID to generate energy, even if you use it yourself, at over 3x what we pay. So on £10,000 panels, you could have earned £1,000+/year for 25 years. But in Oct the Government announced the rate would soon be more than halved for new sign-ups. The Government lost its appeal The Department for Energy and Climate Change (DECC) planned to halve the feed-in tariff for anyone who installed and registered after 12 Dec 2011, even though the consultation on the plans ran until 23 Dec. The Court of Appeal upheld a High Court ruling that these ‘retrospective’ cuts were unlawful. This meant homeowners who get panels up and running before 3 Mar could lock in the higher payments for 25 years. You put solar panels on the roof to generate energy from the sun. There are two types of panel: solar photovoltaic (PV), which generate electricity and solar thermal, which heat water. This guide focuses on solar PV. "Hang on, we don't live in California" may be your first thought. Yet solar panels don't need sunshine to work, just daylight, so you can still generate some electricity on gloomy days – important in a country with weather as dull as watching Steve Davis sleep. PV roof tiles convert the light into electricity, which you can use to power your home during daylight hours. Any energy you don't use is pumped back to the grid. If you use more than the panels generate, the excess comes off the grid, exactly as it did before the panels were fitted. In the winter, when solar power is less, you'll take more power from the grid. It's a good idea to set appliances to run while it's light outside, staggering them to max the savings. For tons more top tips from solar nerds, read the forum's Make the most of solar panels thread. Are solar panels worth it? Many consumers are wondering whether or not the cost of a photovoltaic roof system is reasonable. Getting a simple yes or no doesn’t tell the whole story, as the answer depends on the buyer, upfront money and the proposed unit. There are many variables that decide the cost effectiveness of a PV array, but the buyer is in control of these, making a system within easy grasp of any budget. The benefits of ownership are lower utility bills and energy self-reliance. Owning a PV array of any size will prove to be beneficial. A smaller unit may only lower utility bills a modest amount, but there is a great deal of freedom that comes with the unit. A larger setup can make the homeowner money every month if the system is tied into the power grid. The provider will pay the property owner for any excess energy supplied back to the company. So, are solar panels worth it? One consideration when deciding the answer is the size of the photovoltaic system. The larger the initial setup, the higher the price. When the home’s needs are minimal, the size of the PV array is smaller, meaning less of an investment. The right PV system will be custom designed for the property, and this is important, as it will reduce waste and maximize efficiency. Another consideration a consumer may face is the size of the budget. Fortunately, property owners can usually find a system that can fit into any sized budget. Even purchasing a single PV array when the cash flow allows gets the homeowner going down the right path. The entire system is buildable over time as money permits. Finding a reputable provider and installer is the best way to build a system because a single provider gives uniform service and streamlined business dealings. The home’s location is not as important as it once was. These days, an installer can overcome virtually any obstacle when deciding the best place for a PV array. Are solar panels worth it? There is little doubt that a high quality photovoltaic system custom designed for a specific property is a worthwhile investment. Even if the consumer lives in the northern states, there are ways to guarantee a successful install, giving the buyer the advantages that come with ownership. Each solar panel installation is as unique as the property it’s being attached to. A careful inspection by a trained professional is a must to get the ideal combination. The installer will answer questions and help the buyer decide, “Are solar panels worth it for me?” The initial investment is not prohibitively expensive. Tax rebates, credits and other incentives assist the homeowner in securing the unit without spending too much cash. There are programs offered by many financial institutes that help the purchaser receive loans with low interest rates and no money down. What's in it for you? Done, right solar panels save you cash. You save in two ways: Electricity bill savings. The Energy Saving Trust (EST) estimates a typical 2.9kWp system can knock £90 to £180 off a family's bills, depending on system size, electricity use, whether you're at home during the day and other factors. While solar panels can produce 50% of a home's electricity, often much of this gets pumped back to the grid. If energy prices rise significantly over 25 years as they are predicted to, you'll save more. Feed-in tariff payments. Back in 2010 the Government ditched grants for solar panels and replaced them with a scheme that pays for all the solar energy you produce, even if you use it yourself.

Monday, April 29, 2013

Solar or Black Carbon ? Climate & Melting Ice than CO2?

Black Carbon More Important to Climate & Melting Ice than CO2? A new and detailed study published in the Journal of Geophysical Research - Atmospheres, reveals that black carbon and black soot are far more important to global climate than had been previously admitted by most leading climatologists. More on the implications of this report from WattsupWithThat and NextBigFuture. It is likely that black soot and black carbon are far more responsible for melting glaciers and polar ice than is CO2 -- although the largest cause of melting polar ice and glaciers is natural variation in chaotic climate cycles and natural variation of winds and ocean currents. But if polar bears needed to blame one particular thing for being forced to swim longer distances in a bad year, they should probably blame black soot from China and India. Other significant anthropogenic influences of climate besides black soot include land use changes, shown in the image above. Over the long run, both land use changes and black soot emissions are likely to have far greater effects on glacial and polar ice than CO2. Why? For one thing, we can do more about black carbon emissions than we can about CO2 emissions. For another, there are several powerful negative feedback apparati in nature that compensate for anthropogenic CO2 production. That is not nearly the case for black soot production. For yet another, the very wide range of estimated CO2 sensitivity on climate forcing as much as tells you that scientists have not got a precise handle on the actual importance of CO2 on climate. As you can see from the graphic above, global temperatures have been stuck on a plateau -- at the same time that atmospheric CO2 levels (and climate model temperature predictions) have been rising. The perceived disconnect between atmospheric CO2 and global temperatures may be exaggerated by natural climate cycles, of course. But if you add the combined anthropogenic climatic effects of CO2, black soot, and land use changes together, you have to wonder what kind of natural cycles would be necessary to bring "global warming" to such a screeching halt? More on the AGU study: The study, a four-year, 232-page effort, led by the International Global Atmospheric Chemistry (IGAC) Project, is likely to guide research efforts, climate modeling, and policy for years to come, the authors and other scientists familiar with the paper said. The report’s best estimate of direct climate influence by black carbon is about a factor of two higher than most previous work. This includes the estimates in the 2007 Intergovernmental Panel on Climate Change (IPCC) Assessment, which were based on the best available evidence and analysis at that time. Scientists have spent the years since the last IPCC assessment improving estimates, but the new assessment notes that emissions in some regions are probably higher than estimated. This is consistent with other research that also hinted at significant under-estimates in some regions’ black carbon emissions. The results indicate that there may be a greater potential to curb warming by reducing black carbon emissions than previously thought. _GCC Climatology is still just a baby science -- not ready for prime time. And yet the IPCC wants to control the redistribution of $trillions worth of resources from the developed world to the emerging and third worlds. Purely as a humanitarian gesture, no doubt. After all, who would want the hassle of channeling all of those trillions of dollars, if they did not have the best interests of humanity at heart? A sober reminder about the chaotic underlying nature of climate: A paper titled "Global Warming: A Geological Perspective," published in Environmental Geosciences, and summarized below in Arizona Geology, should be required reading for all climate scientists. The paper notes that if "the temperature increase during the past 130 years reflects recovery from the Little Ice Age, it is not unreasonable to expect the temperature to rise another 2 to 2.5 degrees Celsius to a level comparable to that of the Medieval Warm Period about 800 years ago" and that "Climatic changes measured during the last 100 years are not unique or even unusual when compared with the frequency, rate, and magnitude of changes that have taken place since the beginning of the Holocene Epoch. Recent fluctuations in temperature, both upward and downward, are well within the limits observed in nature prior to human influence." Sadly, most climate scientists fail to study or understand the geologic history of climate, which has led to countless false claims that today's climate is unnatural, extreme, unusual, or unprecedented. __ Source __ via __ GWPF Summary paper PDF with more Note that the paper referred to above was published in 1999 in Environment Geosciences, at the peak of confidence in catastrophic global warming. If the words were true then, they are triply true now that temperature trends have flattened, and multiple causes of warming unrelated to CO2 have been described and verified. Popular climate alarmism and CO2 hysteria resemble the mood manipulation one sees in Hollywood blockbusters, where the soundtrack works together with scripting, acting, and clever camera angles to ratchet up audience panic to a fever pitch. Such mood manipulation on a society-wide scale requires large numbers of useful idiots, gullible clowns, and power control freaks inside government, academia, and media. No surprise here, that is simply how things are managed in a settled regime -- between revolutions.

Solar panel for sale

According to the National Solar Jobs Census 2010, the solar industry employed an estimated 93,000 workers as of August, though only 533 are employed in the state, according to Environment Illinois.

Sixteen of those jobs are located at Solar Service Inc., based in Niles, Ill, which began installing solar equipment in 1977 and, according to Brandon Leavitt, president of the company, installed the first solar system in the state.

“I got into [solar energy] because it’s a less expensive way to do something [and] the fuel is free,” said Leavitt. “It’s a real simple choice and you can get out there and talk about it, but talking about it doesn’t change people’s minds. You have to do it and show them how it works.”

While other states in the Midwest, including Michigan and Wisconsin, ranked fourth and fifth in the nation, respectively, Illinois did not make the top 20 states employing individuals in the solar industry.

The report has identified 16,000 solar employment sites nationwide, which combined, contribute to roughly 1 percent of the country’s energy portfolio.

“So many of our issues are linked to energy, [such as] unemployment, health and balanced trade,” Leavitt said, remarking on the country’s need for energy reform and policy changes in Illinois.

Despite Illinois’ shortcomings, many environmental groups are optimistic on the state’s solar outlook.

“We have this window of opportunity right now we need to take advantage of in order to create a lot of jobs, which we know are going to be created across the U.S.,” said Miranda Carter, field associate for Environment Illinois, a citizen-based advocacy organization. “We just want them to be created here in Illinois.”

Despite the poor economy, 50 percent of the national solar industry is expected to add jobs in the next 12 months. According to the report, this comes at a time when the U.S. economy is expected to grow at a rate of 2 percent for the same period.

Environmental organizers in the state seem to agree the barrier to solar industry growth in Illinois is largely a result of the state’s current policy.

“[The outlook] is positive,” said Michelle Hickey, program coordinator at the Illinois Solar Energy Association. “We’re really at a precipice of a great opportunity and now it’s really a matter of policy helping us pave the way for a lot of jobs and growth.”

According to the ISEA and Environment Illinois, there are several policy changes that could help Illinois achieve a more robust solar industry. The state’s net metering program is one of the policies most closely related to individual residents.

Net metering allows homeowners to install renewable energy generators in their homes—at least a portion of the unused energy can then be sold back to the energy grid for retail credit. Under the state’s current law regarding solar equipment, net metering is limited to small installations.
HQRP 20W Mono-crystalline Solar Panel 20 Watt 12 Volt in Anodized Aluminum Frame plus HQRP Coaster

According to Carter, 16 states currently have limits more than 25 times higher than Illinois—allowing more installations to be built by big box stores and communities, among others. She proposes the state raise its limit.

The two groups also agree the state should authorize the financing of Property Accessed Clean Energy, which would allow residents to install solar panels with no out-of-pocket costs. Instead, it would be paid for with savings on their energy bill throughout time.

“In a lot of other states around the country, solar has had a lot of help getting off the ground, so that’s why we’ve seen growth in other states and why Illinois is kind of lagging,” Carter said. “We haven’t had all of those policies that would help it move forward.”

Though solar currently makes up less than 1 percent of the state’s energy output, all three organizations are hopeful of Illinois’ solar future.

“If we’re able to make these steps then solar will do great in Illinois and we’ll get a lot of benefits like job creation and less pollution,” Carter said.

Saturday, September 11, 2010

Solar Energy Pros and cons

Solar Energy Pros:

Solar panels give off no pollution, the only pollution produced as a result of solar panels is the manufacturing of these devices in factories, transportation of the goods, and installation.

The production of energy from the use of fossil and some renewable fuels (e.g. wind turbines) can be noisy, yet solar energy produces electricity very quietly.

One of the great pros of solar energy is the ability to harness electricity in remote locations that are not linked to a national grid. A prime example of this is in space, where satellites are powered by high efficiency solar cells.

The installation of solar panels in remote locations is usually much more cost effective than laying the required high voltage wires.

Solar energy can be very efficient in a large area of the globe, and new technologies allow for a more efficient energy production on overcast/dull days.

Solar panels can be installed on top of many rooftops, which eliminates the problem of finding the required space for solar panel placement.

Another great pro of solar energy is the cost. Although the initial investment of solar cells may be high, once installed, they provide a free source of electricity, which will pay off over the coming years.

The use of solar energy to produce electricity allows the user to become less dependent on the worlds fossil fuel supplies.

Solar Energy Cons:

The major con of solar energy is the initial cost of solar cells. Currently, prices of highly efficient solar cells can be above $1000, and some households may need more than one. This makes the initial installation of solar panels very costly.

Solar energy is only able to generate electricity during daylight hours. This means for around half of each day, solar panels are not producing energy for your home.

The weather can affect the efficiency of solar cells.

Pollution can be a con of solar energy, as pollution levels can affect a solar cells efficiency, this would be a major con for businesses or industry wishing to install solar panels in heavily polluted areas, such as cities.


Above is a list of many solar energy pros and cons, and although not definitive, you can see how the number of pros relating to solar energy, greatly outweighs the cons of solar energy.

The main reason we are not seeing a large amount of solar energy technology installations is due to cost, and unfortunately, as the price of fossil fuels remains lower than the initial investment towards the currently

Sunday, December 20, 2009

What is Solar Energy ?

Solar energy, radiant light and heat from the Sun, has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar radiation, along with secondary solar-powered resources such as wind and wave power, hydroelectricity and biomass, account for most of the available renewable energy on Earth. Only a minuscule fraction of the available solar energy is used.
Solar powered electrical generation relies on heat engines and photovoltaics. Solar energy's uses are limited only by human ingenuity. A partial list of solar applications includes space heating and cooling through solar architecture, potable water via distillation and disinfection, daylighting, solar hot water, solar cooking, and high temperature process heat for industrial purposes.To harvest the solar energy, the most common way is to use solar panels
Solar technologies are broadly characterized as either passive solar or active solar depending on the way they capture, convert and distribute solar energy. Active solar techniques include the use of photovoltaic panels and solar thermal collectors to harness the energy. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air.

The Earth receives 174 petawatts (PW) of incoming solar radiation (insolation) at the upper atmosphere.[1] Approximately 30% is reflected back to space while the rest is absorbed by clouds, oceans and land masses. The spectrum of solar light at the Earth's surface is mostly spread across the visible and near-infrared ranges with a small part in the near-ultraviolet.[2]
Earth's land surface, oceans and atmosphere absorb solar radiation, and this raises their temperature. Warm air containing evaporated water from the oceans rises, causing atmospheric circulation or convection. When the air reaches a high altitude, where the temperature is low, water vapor condenses into clouds, which rain onto the Earth's surface, completing the water cycle. The latent heat of water condensation amplifies convection, producing atmospheric phenomena such as wind, cyclones and anti-cyclones.[3] Sunlight absorbed by the oceans and land masses keeps the surface at an average temperature of 14 °C.[4] By photosynthesis green plants convert solar energy into chemical energy, which produces food, wood and the biomass from which fossil fuels are derived.[5]
Yearly Solar fluxes & Human Energy Consumption
3,850,000 EJ[6]
2,250 EJ[7]
3,000 EJ[8]
Primary energy use (2005)
487 EJ[9]
Electricity (2005)
56.7 EJ[10]
The total solar energy absorbed by Earth's atmosphere, oceans and land masses is approximately 3,850,000 exajoules (EJ) per year.[11] In 2002, this was more energy in one hour than the world used in one year.[12][13] Photosynthesis captures approximately 3,000 EJ per year in biomass.[14] The amount of solar energy reaching the surface of the planet is so vast that in one year it is about twice as much as will ever be obtained from all of the Earth's non-renewable resources of coal, oil, natural gas, and mined uranium combined.[15]
From the table of resources it would appear that solar, wind or biomass would be sufficient to supply all of our energy needs, however, the increased use of biomass has had a negative effect on global warming and dramatically increased food prices by diverting forests and crops into biofuel production.[16] As intermittent resources, solar and wind raise other issues.
Solar energy can be harnessed in different levels around the world. Depending on a geographical location the closer to the equator the more "potential" solar energy is available.[17]
[edit] Applications of solar technology

Average insolation showing land area (small black dots) required to replace the world primary energy supply with solar electricity. 18 TW is 568 Exajoule (EJ) per year. Insolation for most people is from 150 to 300 W/m² or 3.5 to 7.0 kWh/m²/day.
Solar energy refers primarily to the use of solar radiation for practical ends. However, all renewable energies, other than geothermal and tidal, derive their energy from the sun.
Solar technologies are broadly characterized as either passive or active depending on the way they capture, convert and distribute sunlight. Active solar techniques use photovoltaic panels, pumps, and fans to convert sunlight into useful outputs. Passive solar techniques include selecting materials with favorable thermal properties, designing spaces that naturally circulate air, and referencing the position of a building to the Sun. Active solar technologies increase the supply of energy and are considered supply side technologies, while passive solar technologies reduce the need for alternate resources and are generally considered demand side technologies.[18]
[edit] Architecture and urban planning
Main articles: Passive solar building design and Urban heat island

Darmstadt University of Technology in Germany won the 2007 Solar Decathlon in Washington, D.C. with this passive house designed specifically for the humid and hot subtropical climate.[19]
Sunlight has influenced building design since the beginning of architectural history.[20] Advanced solar architecture and urban planning methods were first employed by the Greeks and Chinese, who oriented their buildings toward the south to provide light and warmth.[21]
The common features of passive solar architecture are orientation relative to the Sun, compact proportion (a low surface area to volume ratio), selective shading (overhangs) and thermal mass.[20] When these features are tailored to the local climate and environment they can produce well-lit spaces that stay in a comfortable temperature range. Socrates' Megaron House is a classic example of passive solar design.[20] The most recent approaches to solar design use computer modeling tying together solar lighting, heating and ventilation systems in an integrated solar design package.[22] Active solar equipment such as pumps, fans and switchable windows can complement passive design and improve system performance.
Urban heat islands (UHI) are metropolitan areas with higher temperatures than that of the surrounding environment. The higher temperatures are a result of increased absorption of the Solar light by urban materials such as asphalt and concrete, which have lower albedos and higher heat capacities than those in the natural environment. A straightforward method of counteracting the UHI effect is to paint buildings and roads white and plant trees. Using these methods, a hypothetical "cool communities" program in Los Angeles has projected that urban temperatures could be reduced by approximately 3 °C at an estimated cost of US$1 billion, giving estimated total annual benefits of US$530 million from reduced air-conditioning costs and healthcare savings.[23]
[edit] Agriculture and horticulture
Main articles: Agriculture, Horticulture, and Greenhouse

Greenhouses like these in the Westland municipality of the Netherlands grow vegetables, fruits and flowers.
Agriculture seeks to optimize the capture of solar energy in order to optimize the productivity of plants. Techniques such as timed planting cycles, tailored row orientation, staggered heights between rows and the mixing of plant varieties can improve crop yields.[24][25] While sunlight is generally considered a plentiful resource, the exceptions highlight the importance of solar energy to agriculture. During the short growing seasons of the Little Ice Age, French and English farmers employed fruit walls to maximize the collection of solar energy. These walls acted as thermal masses and accelerated ripening by keeping plants warm. Early fruit walls were built perpendicular to the ground and facing south, but over time, sloping walls were developed to make better use of sunlight. In 1699, Nicolas Fatio de Duillier even suggested using a tracking mechanism which could pivot to follow the Sun.[26] Applications of solar energy in agriculture aside from growing crops include pumping water, drying crops, brooding chicks and drying chicken manure.[27][28] More recently the technology has been embraced by vinters, who use the energy generated by solar panels to power grape presses.[29]
Greenhouses convert solar light to heat, enabling year-round production and the growth (in enclosed environments) of specialty crops and other plants not naturally suited to the local climate. Primitive greenhouses were first used during Roman times to produce cucumbers year-round for the Roman emperor Tiberius.[30] The first modern greenhouses were built in Europe in the 16th century to keep exotic plants brought back from explorations abroad.[31] Greenhouses remain an important part of horticulture today, and plastic transparent materials have also been used to similar effect in polytunnels and row covers.
[edit] Solar lighting

Daylighting features such as this oculus at the top of the Pantheon, in Rome, Italy have been in use since antiquity.
The history of lighting is dominated by the use of natural light. The Romans recognized a right to light as early as the 6th century and English law echoed these judgments with the Prescription Act of 1832.[32][33] In the 20th century artificial lighting became the main source of interior illumination but daylighting techniques and hybrid solar lighting solutions are ways to reduce energy consumption.
Daylighting systems collect and distribute sunlight to provide interior illumination. This passive technology directly offsets energy use by replacing artificial lighting, and indirectly offsets non-solar energy use by reducing the need for air-conditioning.[34] Although difficult to quantify, the use of natural lighting also offers physiological and psychological benefits compared to artificial lighting.[34] Daylighting design implies careful selection of window types, sizes and orientation; exterior shading devices may be considered as well. Individual features include sawtooth roofs, clerestory windows, light shelves, skylights and light tubes. They may be incorporated into existing structures, but are most effective when integrated into a solar design package that accounts for factors such as glare, heat flux and time-of-use. When daylighting features are properly implemented they can reduce lighting-related energy requirements by 25%.[35]
Hybrid solar lighting is an active solar method of providing interior illumination. HSL systems collect sunlight using focusing mirrors that track the Sun and use optical fibers to transmit it inside the building to supplement conventional lighting. In single-story applications these systems are able to transmit 50% of the direct sunlight received.[36]
Solar lights that charge during the day and light up at dusk are a common sight along walkways.[citation needed]
Although daylight saving time is promoted as a way to use sunlight to save energy, recent research has been limited and reports contradictory results: several studies report savings, but just as many suggest no effect or even a net loss, particularly when gasoline consumption is taken into account. Electricity use is greatly affected by geography, climate and economics, making it hard to generalize from single studies.[37]
[edit] Solar thermal
Main article: Solar thermal energy
Solar thermal technologies can be used for water heating, space heating, space cooling and process heat generation.[38]
[edit] Water heating
Main articles: Solar hot water and Solar combisystem

Solar water heaters facing the Sun to maximize gain.
Solar hot water systems use sunlight to heat water. In low geographical latitudes (below 40 degrees) from 60 to 70% of the domestic hot water use with temperatures up to 60 °C can be provided by solar heating systems.[39] The most common types of solar water heaters are evacuated tube collectors (44%) and glazed flat plate collectors (34%) generally used for domestic hot water; and unglazed plastic collectors (21%) used mainly to heat swimming pools.[40]
As of 2007, the total installed capacity of solar hot water systems is approximately 154 GW.[41] China is the world leader in their deployment with 70 GW installed as of 2006 and a long term goal of 210 GW by 2020.[42] Israel and Cyprus are the per capita leaders in the use of solar hot water systems with over 90% of homes using them.[43] In the United States, Canada and Australia heating swimming pools is the dominant application of solar hot water with an installed capacity of 18 GW as of 2005.[18]
[edit] Heating, cooling and ventilation
Main articles: Solar heating, Thermal mass, Solar chimney, and Solar air conditioning

Solar House #1 of Massachusetts Institute of Technology in the United States, built in 1939, used seasonal thermal storage for year-round heating.
In the United States, heating, ventilation and air conditioning (HVAC) systems account for 30% (4.65 EJ) of the energy used in commercial buildings and nearly 50% (10.1 EJ) of the energy used in residential buildings.[35][44] Solar heating, cooling and ventilation technologies can be used to offset a portion of this energy.
Thermal mass is any material that can be used to store heat—heat from the Sun in the case of solar energy. Common thermal mass materials include stone, cement and water. Historically they have been used in arid climates or warm temperate regions to keep buildings cool by absorbing solar energy during the day and radiating stored heat to the cooler atmosphere at night. However they can be used in cold temperate areas to maintain warmth as well. The size and placement of thermal mass depend on several factors such as climate, daylighting and shading conditions. When properly incorporated, thermal mass maintains space temperatures in a comfortable range and reduces the need for auxiliary heating and cooling equipment.[45]
A solar chimney (or thermal chimney, in this context) is a passive solar ventilation system composed of a vertical shaft connecting the interior and exterior of a building. As the chimney warms, the air inside is heated causing an updraft that pulls air through the building. Performance can be improved by using glazing and thermal mass materials in a way that mimics greenhouses.[citation needed]
Deciduous trees and plants have been promoted as a means of controlling solar heating and cooling. When planted on the southern side of a building, their leaves provide shade during the summer, while the bare limbs allow light to pass during the winter.[46] Since bare, leafless trees shade 1/3 to 1/2 of incident solar radiation, there is a balance between the benefits of summer shading and the corresponding loss of winter heating.[47] In climates with significant heating loads, deciduous trees should not be planted on the southern side of a building because they will interfere with winter solar availability. They can, however, be used on the east and west sides to provide a degree of summer shading without appreciably affecting winter solar gain.[48]
[edit] Water treatment
Main articles: Solar still, Solar water disinfection, Solar desalination, and Solar Powered Desalination Unit

Solar water disinfection in Indonesia

Small scale solar powered sewerage treatment plant.
Solar distillation can be used to make saline or brackish water potable. The first recorded instance of this was by 16th century Arab alchemists.[49] A large-scale solar distillation project was first constructed in 1872 in the Chilean mining town of Las Salinas.[50] The plant, which had solar collection area of 4,700 m², could produce up to 22,700 L per day and operated for 40 years.[50] Individual still designs include single-slope, double-slope (or greenhouse type), vertical, conical, inverted absorber, multi-wick, and multiple effect.[49] These stills can operate in passive, active, or hybrid modes. Double-slope stills are the most economical for decentralized domestic purposes, while active multiple effect units are more suitable for large-scale applications.[49]
Solar water disinfection (SODIS) involves exposing water-filled plastic polyethylene terephthalate (PET) bottles to sunlight for several hours.[51] Exposure times vary depending on weather and climate from a minimum of six hours to two days during fully overcast conditions.[52] It is recommended by the World Health Organization as a viable method for household water treatment and safe storage.[53] Over two million people in developing countries use this method for their daily drinking water.[52]
Solar energy may be used in a water stabilisation pond to treat waste water without chemicals or electricity. A further environmental advantage is that algae grow in such ponds and consume carbon dioxide in photosynthesis, although algae may produce toxic chemicals that make the water unusable.[54][55]
[edit] Cooking
Main article: Solar cooker

The Solar Bowl in Auroville, India, concentrates sunlight on a movable receiver to produce steam for cooking.
Solar cookers use sunlight for cooking, drying and pasteurization. They can be grouped into three broad categories: box cookers, panel cookers and reflector cookers.[56] The simplest solar cooker—the box cooker first built by Horace de Saussure in 1767.[57] A basic box cooker consists of an insulated container with a transparent lid. It can be used effectively with partially overcast skies and will typically reach temperatures of 90–150 °C.[58] Panel cookers use a reflective panel to direct sunlight onto an insulated container and reach temperatures comparable to box cookers. Reflector cookers use various concentrating geometries (dish, trough, Fresnel mirrors) to focus light on a cooking container. These cookers reach temperatures of 315 °C and above but require direct light to function properly and must be repositioned to track the Sun.[59]
The solar bowl is a concentrating technology employed by the Solar Kitchen in Auroville, Pondicherry, India, where a stationary spherical reflector focuses light along a line perpendicular to the sphere's interior surface, and a computer control system moves the receiver to intersect this line. Steam is produced in the receiver at temperatures reaching 150 °C and then used for process heat in the kitchen.[60]
A reflector developed by Wolfgang Scheffler in 1986 is used in many solar kitchens. Scheffler reflectors are flexible parabolic dishes that combine aspects of trough and power tower concentrators. Polar tracking is used to follow the Sun's daily course and the curvature of the reflector is adjusted for seasonal variations in the incident angle of sunlight. These reflectors can reach temperatures of 450–650 °C and have a fixed focal point, which simplifies cooking.[61] The world's largest Scheffler reflector system in Abu Road, Rajasthan, India is capable of cooking up to 35,000 meals a day.[62] As of 2008, over 2,000 large Scheffler cookers had been built worldwide.[63]
[edit] Process heat
Main articles: Solar pond, Salt evaporation pond, and Solar furnace

STEP parabolic dishes used for steam production and electrical generation.
Solar concentrating technologies such as parabolic dish, trough and Scheffler reflectors can provide process heat for commercial and industrial applications. The first commercial system was the Solar Total Energy Project (STEP) in Shenandoah, Georgia, USA where a field of 114 parabolic dishes provided 50% of the process heating, air conditioning and electrical requirements for a clothing factory. This grid-connected cogeneration system provided 400 kW of electricity plus thermal energy in the form of 401 kW steam and 468 kW chilled water, and had a one hour peak load thermal storage.[64]
Evaporation ponds are shallow pools that concentrate dissolved solids through evaporation. The use of evaporation ponds to obtain salt from sea water is one of the oldest applications of solar energy. Modern uses include concentrating brine solutions used in leach mining and removing dissolved solids from waste streams.[65]
Clothes lines, clotheshorses, and clothes racks dry clothes through evaporation by wind and sunlight without consuming electricity or gas. In some states of the United States legislation protects the "right to dry" clothes.[66]
Unglazed transpired collectors (UTC) are perforated sun-facing walls used for preheating ventilation air. UTCs can raise the incoming air temperature up to 22 °C and deliver outlet temperatures of 45–60 °C.[67] The short payback period of transpired collectors (3 to 12 years) makes them a more cost-effective alternative than glazed collection systems.[67] As of 2003, over 80 systems with a combined collector area of 35,000 had been installed worldwide, including an 860 m² collector in Costa Rica used for drying coffee beans and a 1,300 m² collector in Coimbatore, India used for drying marigolds.[28]
[edit] Electrical generation
Main article: Solar power
Sunlight can be converted into electricity using photovoltaics (PV), concentrating solar power (CSP), and various experimental technologies. PV has mainly been used to power small and medium-sized applications, from the calculator powered by a single solar cell to off-grid homes powered by a photovoltaic array. For large-scale generation, CSP plants like SEGS have been the norm but recently multi-megawatt PV plants are becoming common. Completed in 2007, the 14 MW power station in Clark County, Nevada, United States and the 20 MW site in Beneixama, Spain are characteristic of the trend toward larger photovoltaic power stations in the United States and Europe.[68] As an intermittent power source, solar power requires a backup supply, which can partially be complemented with wind power. Local backup usually is done with batteries, while utilities normally use pumped-hydro storage. The Institute for Solar Energy Supply Technology of the University of Kassel in Germany pilot-tested a combined power plant linking solar, wind, biogas and hydrostorage to provide load-following power around the clock, entirely from renewable sources.[69]
[edit] Experimental solar power
Main articles: Solar pond and Thermogenerator

Solar Evaporation Ponds in the Atacama Desert, South America
A solar pond is a pool of salt water (usually 1–2 m deep) that collects and stores solar energy. Solar ponds were first proposed by Dr. Rudolph Bloch in 1948 after he came across reports of a lake in Hungary in which the temperature increased with depth. This effect was due to salts in the lake's water, which created a "density gradient" that prevented convection currents. A prototype was constructed in 1958 on the shores of the Dead Sea near Jerusalem.[70] The pond consisted of layers of water that successively increased from a weak salt solution at the top to a high salt solution at the bottom. This solar pond was capable of producing temperatures of 90 °C in its bottom layer and had an estimated solar-to-electric efficiency of two percent.
Thermoelectric, or "thermovoltaic" devices convert a temperature difference between dissimilar materials into an electric current. First proposed as a method to store solar energy by solar pioneer Mouchout in the 1800s,[71] thermoelectrics reemerged in the Soviet Union during the 1930s. Under the direction of Soviet scientist Abram Ioffe a concentrating system was used to thermoelectrically generate power for a 1 hp engine.[72] Thermogenerators were later used in the US space program as an energy conversion technology for powering deep space missions such as Cassini, Galileo and Viking. Research in this area is focused on raising the efficiency of these devices from 7–8% to 15–20%.[73]
[edit] Solar chemical
Main article: Solar chemical
Solar chemical processes use solar energy to drive chemical reactions. These processes offset energy that would otherwise come from an alternate source and can convert solar energy into storable and transportable fuels. Solar induced chemical reactions can be divided into thermochemical or photochemical.[74]
Hydrogen production technologies been a significant area of solar chemical research since the 1970s. Aside from electrolysis driven by photovoltaic or photochemical cells, several thermochemical processes have also been explored. One such route uses concentrators to split water into oxygen and hydrogen at high temperatures (2300-2600 °C).[75] Another approach uses the heat from solar concentrators to drive the steam reformation of natural gas thereby increasing the overall hydrogen yield compared to conventional reforming methods.[76] Thermochemical cycles characterized by the decomposition and regeneration of reactants present another avenue for hydrogen production. The Solzinc process under development at the Weizmann Institute uses a 1 MW solar furnace to decompose zinc oxide (ZnO) at temperatures above 1200 °C. This initial reaction produces pure zinc, which can subsequently be reacted with water to produce hydrogen.[77]
Sandia's Sunshine to Petrol (S2P) technology uses the high temperatures generated by concentrating sunlight along with a zirconia/ferrite catalyst to break down atmospheric carbon dioxide into oxygen and carbon monoxide (CO). The carbon monoxide can then be used to synthesize conventional fuels such as methanol, gasoline and jet fuel.[78]
A photogalvanic device is a type of battery in which the cell solution (or equivalent) forms energy-rich chemical intermediates when illuminated. These energy-rich intermediates can potentially be stored and subsequently reacted at the electrodes to produce an electric potential. The ferric-thionine chemical cell is an example of this technology.[79]
Photoelectrochemical cells or PECs consist of a semiconductor, typically titanium dioxide or related titanates, immersed in an electrolyte. When the semiconductor is illuminated an electrical potential develops. There are two types of photoelectrochemical cells: photoelectric cells that convert light into electricity and photochemical cells that use light to drive chemical reactions such as electrolysis.[80]
[edit] Solar vehicles
Main articles: Solar vehicle, Electric boat, and Solar balloon

Australia hosts the World Solar Challenge where solar cars like the Nuna3 race through a 3,021 km (1,877 mi) course from Darwin to Adelaide.
Development of a solar powered car has been an engineering goal since the 1980s. The World Solar Challenge is a biannual solar-powered car race, where teams from universities and enterprises compete over 3,021 kilometres (1,877 mi) across central Australia from Darwin to Adelaide. In 1987, when it was founded, the winner's average speed was 67 kilometres per hour (42 mph) and by 2007 the winner's average speed had improved to 90.87 kilometres per hour (56.46 mph).[81] The North American Solar Challenge and the planned South African Solar Challenge are comparable competitions that reflect an international interest in the engineering and development of solar powered vehicles.[82][83]
Some vehicles use solar panels for auxiliary power, such as for air conditioning, to keep the interior cool, thus reducing fuel consumption.[84][85]
In 1975, the first practical solar boat was constructed in England.[86] By 1995, passenger boats incorporating PV panels began appearing and are now used extensively.[87] In 1996, Kenichi Horie made the first solar powered crossing of the Pacific Ocean, and the sun21 catamaran made the first solar powered crossing of the Atlantic Ocean in the winter of 2006–2007.[88] There are plans to circumnavigate the globe in 2010.[89]

Helios UAV in solar powered flight.
In 1974, the unmanned AstroFlight Sunrise plane made the first solar flight. On 29 April 1979, the Solar Riser made the first flight in a solar powered, fully controlled, man carrying flying machine, reaching an altitude of 40 feet (12 m). In 1980, the Gossamer Penguin made the first piloted flights powered solely by photovoltaics. This was quickly followed by the Solar Challenger which crossed the English Channel in July 1981. In 1990 Eric Raymond in 21 hops flew from California to North Carolina using solar power.[90] Developments then turned back to unmanned aerial vehicles (UAV) with the Pathfinder (1997) and subsequent designs, culminating in the Helios which set the altitude record for a non-rocket-propelled aircraft at 29,524 metres (96,860 ft) in 2001.[91] The Zephyr, developed by BAE Systems, is the latest in a line of record-breaking solar aircraft, making a 54-hour flight in 2007, and month-long flights are envisioned by 2010.[92]
A solar balloon is a black balloon that is filled with ordinary air. As sunlight shines on the balloon, the air inside is heated and expands causing an upward buoyancy force, much like an artificially heated hot air balloon. Some solar balloons are large enough for human flight, but usage is generally limited to the toy market as the surface-area to payload-weight ratio is relatively high.[93]
Solar sails are a proposed form of spacecraft propulsion using large membrane mirrors to exploit radiation pressure from the Sun. Unlike rockets, solar sails require no fuel. Although the thrust is small compared to rockets, it continues as long as the Sun shines onto the deployed sail and in the vacuum of space significant speeds can eventually be achieved.[94]
The High-altitude airship (HAA) is an unmanned, long-duration, lighter-than-air vehicle using helium gas for lift, and thin-film solar cells for power. The United States Department of Defense Missile Defense Agency has contracted Lockheed Martin to construct it to enhance the Ballistic Missile Defense System (BMDS).[95] Airships have some advantages for solar-powered flight: they do not require power to remain aloft, and an airship's envelope presents a large area to the Sun.
[edit] Energy storage methods
Main articles: Thermal mass, Thermal energy storage, Phase change material, Grid energy storage, and V2G

Solar Two's thermal storage system generated electricity during cloudy weather and at night.
Solar energy is not available at night, and energy storage is an important issue because modern energy systems usually assume continuous availability of energy.[96]
Thermal mass systems can store solar energy in the form of heat at domestically useful temperatures for daily or seasonal durations. Thermal storage systems generally use readily available materials with high specific heat capacities such as water, earth and stone. Well-designed systems can lower peak demand, shift time-of-use to off-peak hours and reduce overall heating and cooling requirements.[97][98]
Phase change materials such as paraffin wax and Glauber's salt are another thermal storage media. These materials are inexpensive, readily available, and can deliver domestically useful temperatures (approximately 64 °C). The "Dover House" (in Dover, Massachusetts) was the first to use a Glauber's salt heating system, in 1948.[99]
Solar energy can be stored at high temperatures using molten salts. Salts are an effective storage medium because they are low-cost, have a high specific heat capacity and can deliver heat at temperatures compatible with conventional power systems. The Solar Two used this method of energy storage, allowing it to store 1.44 TJ in its 68 storage tank with an annual storage efficiency of about 99%.[100]
Off-grid PV systems have traditionally used rechargeable batteries to store excess electricity. With grid-tied systems, excess electricity can be sent to the transmission grid. Net metering programs give these systems a credit for the electricity they deliver to the grid. This credit offsets electricity provided from the grid when the system cannot meet demand, effectively using the grid as a storage mechanism.[101]
Pumped-storage hydroelectricity stores energy in the form of water pumped when energy is available from a lower elevation reservoir to a higher elevation one. The energy is recovered when demand is high by releasing the water to run through a hydroelectric power generator.[102]
[edit] Development, deployment and economics
Main article: Deployment of solar power to energy grids

Nellis Solar Power Plant in the United States, the largest photovoltaic power plant in North America.
Beginning with the surge in coal use which accompanied the Industrial Revolution, energy consumption has steadily transitioned from wood and biomass to fossil fuels. The early development of solar technologies starting in the 1860s was driven by an expectation that coal would soon become scarce. However development of solar technologies stagnated in the early 20th century in the face of the increasing availability, economy, and utility of coal and petroleum.[103]
The 1973 oil embargo and 1979 energy crisis caused a reorganization of energy policies around the world and brought renewed attention to developing solar technologies.[104][105] Deployment strategies focused on incentive programs such as the Federal Photovoltaic Utilization Program in the US and the Sunshine Program in Japan. Other efforts included the formation of research facilities in the US (SERI, now NREL), Japan (NEDO), and Germany (Fraunhofer Institute for Solar Energy Systems ISE).[106]
Commercial solar water heaters began appearing in the United States in the 1890s.[107] These systems saw increasing use until the 1920s but were gradually replaced by cheaper and more reliable heating fuels.[108] As with photovoltaics, solar water heating attracted renewed attention as a result of the oil crises in the 1970s but interest subsided in the 1980s due to falling petroleum prices. Development in the solar water heating sector progressed steadily throughout the 1990s and growth rates have averaged 20% per year since 1999.[41] Although generally underestimated, solar water heating is by far the most widely deployed solar technology

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