Solar energy

نوشته شده در موضوع تولید انرژی رایگان در 17 سپتامبر 2016

Part of a array about
Sustainable energy

Energy conservation

  • Cogeneration
  • Efficient appetite use
  • Green building
  • Heat pump
  • Low-carbon power
  • Microgeneration
  • Passive solar building design

Renewable energy

  • Anaerobic digestion
  • Geothermal
  • Hydroelectricity
  • Solar
  • Tidal
  • Wind

Sustainable transport

  • Carbon-neutral fuel
  • Electric vehicle
  • Fossil-fuel phase-out
  • Green vehicle
  • Plug-in hybrid

Solar energy is eager light and feverishness from a Sun that is harnessed regulating a operation of ever-evolving technologies such as solar heating, photovoltaics, solar thermal energy, solar pattern and synthetic photosynthesis.[1][2]

It is an critical source of renewable appetite and a technologies are broadly characterized as possibly pacifist solar or active solar depending on how they constraint and discharge solar appetite or modify it into solar power. Active solar techniques embody a use of photovoltaic systems, strong solar appetite and solar H2O heating to strap a energy. Passive solar techniques embody orienting a building to a Sun, selecting materials with auspicious thermal mass or light-dispersing properties, and conceptualizing spaces that naturally disseminate air.

The immeasurable bulk of solar appetite accessible creates it a rarely appealing source of electricity. The United Nations Development Programme in a 2000 World Energy Assessment found that a annual intensity of solar appetite was 1,575–49,837 exajoules (EJ). This is several times incomparable than a sum universe appetite consumption, that was 559.8 EJ in 2012.[3][4]

In 2011, a International Energy Agency pronounced that “the expansion of affordable, lavish and purify solar appetite technologies will have outrageous longer-term benefits. It will boost countries’ appetite confidence by faith on an indigenous, lavish and mostly import-independent resource, lift sustainability, revoke pollution, revoke a costs of mitigating tellurian warming, and keep hoary fuel prices revoke than otherwise. These advantages are global. Hence a additional costs of a incentives for early deployment should be deliberate training investments; they contingency be wisely spent and need to be widely shared”.[1]


The Earth receives 174,000 terawatts (TW) of incoming solar deviation (insolation) during a top atmosphere.[5] Approximately 30% is reflected behind to space while a rest is engrossed by clouds, oceans and land masses. The spectrum of solar light during a Earth’s aspect is mostly widespread opposite a manifest and near-infrared ranges with a tiny partial in a near-ultraviolet.[6] Most of a world’s competition live in areas with insolation levels of 150-300 watts/m², or 3.5-7.0 kWh/m² per day.

Solar deviation is engrossed by a Earth’s land surface, oceans – that cover about 71% of a creation – and atmosphere. Warm atmosphere containing evaporated H2O from a oceans rises, causing windy dissemination or convection. When a atmosphere reaches a high altitude, where a feverishness is low, H2O fog condenses into clouds, that sleet onto a Earth’s surface, completing a H2O cycle. The implicit feverishness of H2O precipitation amplifies convection, producing windy phenomena such as wind, cyclones and anti-cyclones.[7] Sunlight engrossed by a oceans and land masses keeps a aspect during an normal feverishness of 14 °C.[8] By photosynthesis, immature plants modify solar appetite into chemically stored energy, that produces food, timber and a biomass from that hoary fuels are derived.[9]

The sum solar appetite engrossed by Earth’s atmosphere, oceans and land masses is approximately 3,850,000 exajoules (EJ) per year.[10] In 2002, this was some-more appetite in one hour than a universe used in one year.[11][12] Photosynthesis captures approximately 3,000 EJ per year in biomass.[13] The volume of solar appetite reaching a aspect of a universe is so immeasurable that in one year it is about twice as many as will ever be performed from all of a Earth’s non-renewable resources of coal, oil, healthy gas, and mined uranium combined,[14]

The intensity solar appetite that could be used by humans differs from a volume of solar appetite benefaction nearby a aspect of a universe given factors such as geography, time variation, cloud cover, and a land accessible to humans border a volume of solar appetite that we can acquire.

Geography affects solar appetite intensity given areas that are closer to a equator have a incomparable volume of solar radiation. However, a use of photovoltaics that can follow a position of a object can significantly boost a solar appetite intensity in areas that are over from a equator.[4] Time movement effects a intensity of solar appetite given during a night there is tiny solar deviation on a aspect of a Earth for solar panels to absorb. This boundary a volume of appetite that solar panels can catch in one day. Cloud cover can impact a intensity of solar panels given clouds retard incoming light from a object and revoke a light accessible for solar cells.

In addition, land accessibility has a immeasurable outcome on a accessible solar appetite given solar panels can usually be set adult on land that is differently new and suitable for solar panels. Roofs have been found to be a suitable place for solar cells, as many people have detected that they can collect appetite directly from their homes this way. Other areas that are suitable for solar cells are lands that are not being used for businesses where solar plants can be established.[4]

Solar technologies are characterized as possibly pacifist or active depending on a proceed they capture, modify and discharge object and capacitate solar appetite to be harnessed during opposite levels around a world, mostly depending on stretch from a equator. Although solar appetite refers essentially to a use of solar deviation for unsentimental ends, all renewable energies, other than Geothermal appetite and Tidal power, get their appetite possibly directly or indirectly from a Sun.

Active solar techniques use photovoltaics, strong solar power, solar thermal collectors, pumps, and fans to modify object into useful outputs. Passive solar techniques embody selecting materials with auspicious thermal properties, conceptualizing spaces that naturally disseminate air, and referencing a position of a building to a Sun. Active solar technologies boost a supply of appetite and are deliberate supply side technologies, while pacifist solar technologies revoke a need for swap resources and are generally deliberate proceed side technologies.[19]

In 2000, a United Nations Development Programme, UN Department of Economic and Social Affairs, and World Energy Council published an guess of a intensity solar appetite that could be used by humans any year that took into comment factors such as insolation, cloud cover, and a land that is serviceable by humans. The guess found that solar appetite has a tellurian intensity of 1,575–49,837 EJ per year (see list below).[4]

Thermal energy

Solar thermal technologies can be used for H2O heating, space heating, space cooling and routine feverishness generation.[20]

Early blurb adaptation

In 1897, Frank Shuman, a U.S. inventor, operative and solar appetite colonize built a tiny proof solar engine that worked by reflecting solar appetite onto block boxes filled with ether, that has a revoke prohibited indicate than water, and were propitious internally with black pipes that in spin powered a steam engine. In 1908 Shuman shaped a Sun Power Company with a vigilant of building incomparable solar appetite plants. He, along with his technical confidant A.S.E. Ackermann and British physicist Sir Charles Vernon Boys,[21] grown an softened element regulating mirrors to simulate solar appetite on gourmet boxes, augmenting heating ability to a border that H2O could now be used instead of ether. Shuman afterwards assembled a full-scale steam engine powered by low-pressure water, enabling him to obvious a whole solar engine element by 1912.

Shuman built a world’s initial solar thermal appetite hire in Maadi, Egypt, between 1912 and 1913. His plant used parabolic troughs to appetite a 45–52 kilowatts (60–70 hp) engine that pumped some-more than 22,000 litres (4,800 imp gal; 5,800 US gal) of H2O per notation from a Nile River to adjacent string fields. Although a conflict of World War we and a find of inexpensive oil in a 1930s disheartened a enrichment of solar energy, Shuman’s prophesy and simple pattern were resurrected in a 1970s with a new call of seductiveness in solar thermal energy.[22] In 1916 Shuman was quoted in a media advocating solar energy’s utilization, saying:

We have valid a blurb distinction of object appetite in a tropics and have some-more quite valid that after a stores of oil and spark are tired a tellurian competition can accept sum appetite from a rays of a sun.

Water heating

Solar prohibited H2O systems use object to feverishness water. In low geographical latitudes (below 40 degrees) from 60 to 70% of a domestic prohibited H2O use with temperatures adult to 60 °C can be supposing by solar heating systems.[24] The many common forms of solar H2O heaters are evacuated tube collectors (44%) and glassy prosaic image collectors (34%) generally used for domestic prohibited water; and unglazed cosmetic collectors (21%) used especially to feverishness swimming pools.[25]

As of 2007, a sum commissioned ability of solar prohibited H2O systems was approximately 154 thermal gigawatt (GWth).[26] China is a universe personality in their deployment with 70 GWth commissioned as of 2006 and a long-term idea of 210 GWth by 2020.[27]Israel and Cyprus are a per capita leaders in a use of solar prohibited H2O systems with over 90% of homes regulating them.[28] In a United States, Canada, and Australia, heating swimming pools is a widespread concentration of solar prohibited H2O with an commissioned ability of 18 GWth as of 2005.[19]

Heating, cooling and ventilation

In a United States, heating, movement and atmosphere conditioning (HVAC) systems comment for 30% (4.65 EJ/yr) of a appetite used in blurb buildings and scarcely 50% (10.1 EJ/yr) of a appetite used in residential buildings.[29][30] Solar heating, cooling and movement technologies can be used to equivalent a apportionment of this energy.

Thermal mass is any element that can be used to store heat—heat from a Sun in a box of solar energy. Common thermal mass materials embody stone, petrify and water. Historically they have been used in dull climates or gentle ascetic regions to keep buildings cold by interesting solar appetite during a day and radiating stored feverishness to a cooler atmosphere during night. However, they can be used in cold ascetic areas to say regard as well. The distance and chain of thermal mass count on several factors such as climate, daylighting and shading conditions. When scrupulously incorporated, thermal mass maintains space temperatures in a gentle operation and reduces a need for auxiliary heating and cooling equipment.[31]

A solar funnel (or thermal chimney, in this context) is a pacifist solar movement element stoical of a straight missile joining a interior and extraneous of a building. As a funnel warms, a atmosphere inside is exhilarated causing an updraft that pulls atmosphere by a building. Performance can be softened by regulating glazing and thermal mass materials[32] in a proceed that mimics greenhouses.

Deciduous trees and plants have been promoted as a means of determining solar heating and cooling. When planted on a southern side of a building in a northern hemisphere or a northern side in a southern hemisphere, their leaves furnish shade during a summer, while a unclothed limbs concede light to pass during a winter.[33] Since bare, leafless trees shade 1/3 to 1/2 of occurrence solar radiation, there is a change between a advantages of summer shading and a analogous detriment of winter heating.[34] In climates with poignant heating loads, deciduous trees should not be planted on a Equator-facing side of a building given they will meddle with winter solar availability. They can, however, be used on a easterly and west sides to furnish a grade of summer shading yet appreciably inspiring winter solar gain.[35]


Solar cookers use object for cooking, drying and pasteurization. They can be grouped into 3 extended categories: box cookers, quarrel cookers and mirror cookers.[36] The simplest solar cooker is a box cooker initial built by Horace de Saussure in 1767.[37] A simple box cooker consists of an insulated enclosure with a pristine lid. It can be used effectively with partially cloudy skies and will typically strech temperatures of 90–150 °C (194–302 °F).[38] Panel cookers use a contemplative quarrel to proceed object onto an insulated enclosure and strech temperatures allied to box cookers. Reflector cookers use several concentrating geometries (dish, trough, Fresnel mirrors) to concentration light on a cooking container. These cookers strech temperatures of 315 °C (599 °F) and above yet need proceed light to duty scrupulously and contingency be repositioned to lane a Sun.[39]

Process heat

Solar concentrating technologies such as parabolic dish, tray and Scheffler reflectors can furnish routine feverishness for blurb and industrial applications. The initial blurb element was a Solar Total Energy Project (STEP) in Shenandoah, Georgia, USA where a margin of 114 parabolic dishes supposing 50% of a routine heating, atmosphere conditioning and electrical mandate for a wardrobe factory. This grid-connected cogeneration element supposing 400 kW of electricity and thermal appetite in a form of 401 kW steam and 468 kW cold water, and had a one-hour rise bucket thermal storage.[40] Evaporation ponds are shoal pools that combine dissolved solids by evaporation. The use of evaporation ponds to obtain salt from seawater is one of a oldest applications of solar energy. Modern uses embody concentrating brine solutions used in leach mining and stealing dissolved solids from rubbish streams.[41]Clothes lines, clotheshorses, and garments racks dry garments by evaporation by breeze and object yet immoderate electricity or gas. In some states of a United States legislation protects a “right to dry” clothes.[42] Unglazed transpired collectors (UTC) are seperated sun-facing walls used for preheating movement air. UTCs can lift a incoming atmosphere feverishness adult to 22 °C (40 °F) and broach opening temperatures of 45–60 °C (113–140 °F).[43] The brief payback duration of transpired collectors (3 to 12 years) creates them a some-more cost-effective choice than glassy collection systems.[43] As of 2003, over 80 systems with a sum gourmet area of 35,000 block metres (380,000 sq ft) had been commissioned worldwide, including an 860 m2 (9,300 sq ft) gourmet in Costa Rica used for drying coffee beans and a 1,300 m2 (14,000 sq ft) gourmet in Coimbatore, India, used for drying marigolds.[44]

Water treatment

Solar solution can be used to make salty or brackish H2O potable. The initial accessible instance of this was by 16th-century Arab alchemists.[45] A large-scale solar solution plan was initial assembled in 1872 in a Chilean mining city of Las Salinas.[46] The plant, that had solar collection area of 4,700 m2 (51,000 sq ft), could furnish adult to 22,700 L (5,000 imp gal; 6,000 US gal) per day and work for 40 years.[46] Individual still designs embody single-slope, double-slope (or hothouse type), vertical, conical, inverted absorber, multi-wick, and mixed effect. These stills can work in passive, active, or hybrid modes. Double-slope stills are a many careful for decentralized domestic purposes, while active mixed outcome units are some-more suitable for large-scale applications.[45]

Solar H2O disinfection (SODIS) involves exposing water-filled cosmetic polyethylene terephthalate (PET) bottles to object for several hours.[47] Exposure times change depending on continue and meridian from a smallest of 6 hours to dual days during entirely cloudy conditions.[48] It is endorsed by a World Health Organization as a viable routine for domicile H2O diagnosis and protected storage.[49] Over dual million people in building countries use this routine for their daily celebration water.[48]

Solar appetite might be used in a H2O stabilization pool to furnish rubbish H2O yet chemicals or electricity. A serve environmental advantage is that algae grow in such ponds and devour CO dioxide in photosynthesis, nonetheless algae might furnish poisonous chemicals that make a H2O unusable.[50][51]

Electricity production

Solar appetite is a acclimatisation of object into electricity, possibly directly regulating photovoltaics (PV), or indirectly regulating strong solar appetite (CSP). CSP systems use lenses or mirrors and tracking systems to concentration a immeasurable area of object into a tiny beam. PV translates light into electric stream regulating a photoelectric effect.

Solar appetite is expected to turn a world’s largest source of electricity by 2050, with solar photovoltaics and strong solar appetite contributing 16 and 11 percent to a tellurian altogether consumption, respectively.[52]

Commercial CSP plants were initial grown in a 1980s. Since 1985 a eventually 354 MW SEGS CSP installation, in a Mojave Desert of California, is a largest solar appetite plant in a world. Other immeasurable CSP plants embody a 150 MW Solnova Solar Power Station and a 100 MW Andasol solar appetite station, both in Spain. The 250 MW Agua Caliente Solar Project, in a United States, and a 221 MW Charanka Solar Park in India, are a world’s largest photovoltaic plants. Solar projects surpassing 1 GW are being developed, yet many of a deployed photovoltaics are in tiny rooftop arrays of rebate than 5 kW, that are connected to a grid regulating net metering and/or a feed-in tariff.[53] In 2013 solar generated rebate than 1% of a world’s sum grid electricity.[54]


Worldwide expansion of PV ability grouped by segment in MW (2006–2014)

In a final dual decades, photovoltaics (PV), also famous as solar PV, has grown from a pristine niche marketplace of tiny scale applications towards apropos a mainstream electricity source. A solar dungeon is a device that translates light directly into electricity regulating a photoelectric effect. The initial solar dungeon was assembled by Charles Fritts in a 1880s.[55] In 1931 a German engineer, Dr Bruno Lange, grown a print dungeon regulating china selenide in place of copper oxide.[56] Although a antecedent selenium cells converted rebate than 1% of occurrence light into electricity, both Ernst Werner von Siemens and James Clerk Maxwell famous a significance of this discovery.[57] Following a work of Russell Ohl in a 1940s, researchers Gerald Pearson, Calvin Fuller and Daryl Chapin combined a bright silicon solar dungeon in 1954.[58] These early solar cells cost 286 USD/watt and reached efficiencies of 4.5–6%.[59] By 2012 accessible efficiencies exceeded 20%, and a limit potency of investigate photovoltaics was in additional of 40%.[60]

Concentrated solar power

Concentrating Solar Power (CSP) systems use lenses or mirrors and tracking systems to concentration a immeasurable area of object into a tiny beam. The strong feverishness is afterwards used as a feverishness source for a required appetite plant. A far-reaching operation of concentrating technologies exists; a many grown are a parabolic trough, a concentrating linear fresnel reflector, a Stirling plate and a solar appetite tower. Various techniques are used to lane a Sun and concentration light. In all of these systems a operative liquid is exhilarated by a strong sunlight, and is afterwards used for appetite era or appetite storage.[61]

Architecture and civic planning

Sunlight has shabby building pattern given a commencement of architectural history.[63] Advanced solar pattern and civic formulation methods were initial employed by a Greeks and Chinese, who oriented their buildings toward a south to furnish light and warmth.[64]

The common comforts of pacifist solar pattern are course relations to a Sun, compress suit (a low aspect area to volume ratio), resourceful shading (overhangs) and thermal mass.[63] When these comforts are tailored to a internal meridian and sourroundings they can furnish well-lit spaces that stay in a gentle feverishness range. Socrates’ Megaron House is a classical instance of pacifist solar design.[63] The many new approaches to solar pattern use apparatus displaying restraining together solar lighting, heating and movement systems in an integrated solar pattern package.[65]Active solar apparatus such as pumps, fans and switchable windows can element pacifist pattern and urge element performance.

Urban feverishness islands (UHI) are civil areas with aloft temperatures than that of a surrounding environment. The aloft temperatures outcome from augmenting fullness of solar appetite by civic materials such as pavement and concrete, that have revoke albedos and aloft feverishness capacities than those in a healthy environment. A candid routine of counteracting a UHI outcome is to paint buildings and roads white, and to plant trees in a area. Using these methods, a suppositious “cool communities” module in Los Angeles has projected that civic temperatures could be reduced by approximately 3 °C during an estimated cost of US$1 billion, giving estimated sum annual advantages of US$530 million from reduced air-conditioning costs and medical savings.[66]

Agriculture and horticulture

Agriculture and horticulture find to optimize a constraint of solar appetite in sequence to optimize a capability of plants. Techniques such as timed planting cycles, tailored quarrel orientation, staggered heights between rows and a blending of plant varieties can urge stand yields.[67][68] While object is generally deliberate a abundant resource, a exceptions prominence a significance of solar appetite to agriculture. During a brief flourishing seasons of a Little Ice Age, French and English farmers employed fruit walls to maximize a collection of solar energy. These walls acted as thermal masses and accelerated ripening by gripping plants warm. Early fruit walls were built perpendicular to a belligerent and confronting south, yet over time, tilted walls were grown to make softened use of sunlight. In 1699, Nicolas Fatio de Duillier even suggested regulating a tracking apparatus that could focus to follow a Sun.[69] Applications of solar appetite in cultivation aside from flourishing crops embody pumping water, drying crops, brooding chicks and drying duck manure.[44][70] More recently a record has been embraced by vintners, who use a appetite generated by solar panels to appetite grape presses.[71]

Greenhouses modify solar light to heat, enabling year-round prolongation and a expansion (in enclosed environments) of specialty crops and other plants not naturally matched to a internal climate. Primitive greenhouses were initial used during Roman times to furnish cucumbers year-round for a Roman czar Tiberius.[72] The initial complicated greenhouses were built in Europe in a 16th century to keep outlandish plants brought behind from explorations abroad.[73] Greenhouses sojourn an critical partial of horticulture today, and cosmetic pristine materials have also been used to identical outcome in polytunnels and quarrel covers.


Development of a solar-powered automobile has been an engineering idea given a 1980s. The World Solar Challenge is a biannual solar-powered automobile race, where teams from universities and enterprises contest over 3,021 kilometres (1,877 mi) opposite executive Australia from Darwin to Adelaide. In 1987, when it was founded, a winner’s normal speed was 67 kilometres per hour (42 mph) and by 2007 a winner’s normal speed had softened to 90.87 kilometres per hour (56.46 mph).[74] The North American Solar Challenge and a designed South African Solar Challenge are allied competitions that simulate an general seductiveness in a engineering and expansion of solar powered vehicles.[75][76]

Some vehicles use solar panels for auxiliary power, such as for atmosphere conditioning, to keep a interior cool, so shortening fuel consumption.[77][78]

In 1975, a initial unsentimental solar vessel was assembled in England.[79] By 1995, newcomer boats incorporating PV panels began appearing and are now used extensively.[80] In 1996, Kenichi Horie done a initial solar-powered channel of a Pacific Ocean, and a Sun21 catamaran done a initial solar-powered channel of a Atlantic Ocean in a winter of 2006–2007.[81] There were skeleton to detour a creation in 2010.[82]

In 1974, a unmanned AstroFlight Sunrise aeroplane done a initial solar flight. On 29 Apr 1979, a Solar Riser done a initial moody in a solar-powered, entirely controlled, man-carrying drifting machine, reaching an altitude of 40 feet (12 m). In 1980, a Gossamer Penguin done a initial piloted flights powered only by photovoltaics. This was fast followed by a Solar Challenger that crossed a English Channel in Jul 1981. In 1990 Eric Scott Raymond in 21 hops flew from California to North Carolina regulating solar power.[83] Developments afterwards incited behind to unmanned aerial vehicles (UAV) with a Pathfinder (1997) and successive designs, culminating in a Helios that set a altitude record for a non-rocket-propelled aircraft during 29,524 metres (96,864 ft) in 2001.[84] The Zephyr, grown by BAE Systems, is a latest in a line of record-breaking solar aircraft, creation a 54-hour moody in 2007, and month-long flights were envisioned by 2010.[85] As of 2016, Solar Impulse, an electric aircraft, is now circumnavigating a globe. It is a single-seat craft powered by solar cells and able of holding off underneath a possess power. The pattern allows a aircraft to sojourn airborne for several days.[86]

A solar balloon is a black balloon that is filled with typical air. As object shines on a balloon, a atmosphere inside is exhilarated and expands causing an ceiling irresolution force, many like an artificially exhilarated prohibited atmosphere balloon. Some solar balloons are immeasurable adequate for tellurian flight, yet use is generally singular to a fondle marketplace as a surface-area to payload-weight ratio is comparatively high.[87]

Fuel production

Solar chemical processes use solar appetite to expostulate chemical reactions. These processes equivalent appetite that would differently come from a hoary fuel source and can also modify solar appetite into storable and transportable fuels. Solar prompted chemical reactions can be divided into thermochemical or photochemical.[88] A accumulation of fuels can be constructed by synthetic photosynthesis.[89] The multielectron catalytic chemistry concerned in creation carbon-based fuels (such as methanol) from rebate of CO dioxide is challenging; a possibly choice is hydrogen prolongation from protons, yet use of H2O as a source of electrons (as plants do) requires mastering a multielectron burning of dual H2O molecules to molecular oxygen.[90] Some have envisaged operative solar fuel plants in coastal civil areas by 2050 – a bursting of sea H2O providing hydrogen to be run by adjacent fuel-cell electric appetite plants and a pristine H2O by-product going directly into a metropolitan H2O system.[91] Another prophesy involves all tellurian structures covering a earth’s aspect (i.e., roads, vehicles and buildings) doing photosynthesis some-more well than plants.[92]

Hydrogen prolongation technologies have been a poignant area of solar chemical investigate given a 1970s. Aside from electrolysis driven by photovoltaic or photochemical cells, several thermochemical processes have also been explored. One such track uses concentrators to separate H2O into oxygen and hydrogen during high temperatures (2,300–2,600 °C or 4,200–4,700 °F).[93] Another proceed uses a feverishness from solar concentrators to expostulate a steam rider of healthy gas thereby augmenting a altogether hydrogen furnish compared to required reforming methods.[94] Thermochemical cycles characterized by a decay and metamorphosis of reactants benefaction another entrance for hydrogen production. The Solzinc routine underneath expansion during a Weizmann Institute of Science uses a 1 MW solar furnace to spoil zinc oxide (ZnO) during temperatures above 1,200 °C (2,200 °F). This initial greeting produces pristine zinc, that can subsequently be reacted with H2O to furnish hydrogen.[95]

Energy storage methods

Thermal mass systems can store solar appetite in a form of feverishness during domestically useful temperatures for daily or interseasonal durations. Thermal storage systems generally use straightforwardly accessible materials with high specific feverishness capacities such as water, earth and stone. Well-designed systems can revoke rise demand, change time-of-use to off-peak hours and revoke altogether heating and cooling requirements.[96][97]

Phase change materials such as paraffin polish and Glauber’s salt are another thermal storage medium. These materials are inexpensive, straightforwardly available, and can broach domestically useful temperatures (approximately 64 °C or 147 °F). The “Dover House” (in Dover, Massachusetts) was a initial to use a Glauber’s salt heating system, in 1948.[98] Solar appetite can also be stored during high temperatures regulating fiery salts. Salts are an effective storage middle given they are low-cost, have a high specific feverishness ability and can broach feverishness during temperatures concordant with required appetite systems. The Solar Two plan used this routine of appetite storage, permitting it to store 1.44 terajoules (400,000 kWh) in a 68 m³ storage tank with an annual storage potency of about 99%.[99]

Off-grid PV systems have traditionally used rechargeable batteries to store additional electricity. With grid-tied systems, additional electricity can be sent to a delivery grid, while customary grid electricity can be used to accommodate shortfalls. Net metering programs give domicile systems a credit for any electricity they broach to a grid. This is rubbed by ‘rolling back’ a scale whenever a home produces some-more electricity than it consumes. If a net electricity use is subsequent zero, a application afterwards rolls over a kilowatt hour credit to a subsequent month.[100] Other approaches engage a use of dual meters, to magnitude electricity consumed vs. electricity produced. This is rebate common due to a augmenting designation cost of a second meter. Most customary meters accurately magnitude in both directions, creation a second scale unnecessary.

Pumped-storage hydroelectricity stores appetite in a form of H2O pumped when appetite is accessible from a revoke betterment fountainhead to a aloft betterment one. The appetite is recovered when proceed is high by releasing a water, with a siphon apropos a hydroelectric appetite generator.[101]

Development, deployment and economics

Beginning with a swell in spark use that accompanied a Industrial Revolution, appetite expenditure has usually transitioned from timber and biomass to hoary fuels. The early expansion of solar technologies starting in a 1860s was driven by an expectancy that spark would shortly turn scarce. However, expansion of solar technologies stagnated in a early 20th century in a face of a augmenting availability, economy, and application of spark and petroleum.[102]

The 1973 oil embargo and 1979 appetite predicament caused a reorder of appetite policies around a universe and brought renewed courtesy to building solar technologies.[103][104] Deployment strategies focused on inducement programs such as a Federal Photovoltaic Utilization Program in a U.S. and a Sunshine Program in Japan. Other efforts enclosed a arrangement of investigate comforts in a U.S. (SERI, now NREL), Japan (NEDO), and Germany (Fraunhofer Institute for Solar Energy Systems ISE).[105]

Commercial solar H2O heaters began appearing in a United States in a 1890s.[106] These systems saw augmenting use until a 1920s yet were gradually transposed by cheaper and some-more arguable heating fuels.[107] As with photovoltaics, solar H2O heating captivated renewed courtesy as a outcome of a oil crises in a 1970s yet seductiveness subsided in a 1980s due to descending petroleum prices. Development in a solar H2O heating zone progressed usually around a 1990s and annual expansion rates have averaged 20% given 1999.[26] Although generally underestimated, solar H2O heating and cooling is by distant a many widely deployed solar record with an estimated ability of 154 GW as of 2007.[26]

The International Energy Agency has pronounced that solar appetite can make substantial contributions to elucidate some of a many obligatory problems a universe now faces:[1]

The expansion of affordable, lavish and purify solar appetite technologies will have outrageous longer-term benefits. It will boost countries’ appetite confidence by faith on an indigenous, lavish and mostly import-independent resource, lift sustainability, revoke pollution, revoke a costs of mitigating meridian change, and keep hoary fuel prices revoke than otherwise. These advantages are global. Hence a additional costs of a incentives for early deployment should be deliberate training investments; they contingency be wisely spent and need to be widely shared.[1]

In 2011, a news by a International Energy Agency found that solar appetite technologies such as photovoltaics, solar prohibited H2O and strong solar appetite could furnish a third of a world’s appetite by 2060 if politicians dedicate to tying meridian change. The appetite from a object could play a pivotal purpose in de-carbonizing a tellurian economy alongside improvements in appetite potency and commanding costs on hothouse gas emitters. “The strength of solar is a implausible accumulation and coherence of applications, from tiny scale to large scale”.[108]

We have valid … that after a stores of oil and spark are tired a tellurian competition can accept sum appetite from a rays of a sun.

ISO standards

The International Organization for Standardization has determined several standards relating to solar appetite equipment. For example, ISO 9050 relates to potion in building while ISO 10217 relates to a materials used in solar H2O heaters.

See also

  • Renewable appetite portal
  • Sustainable expansion portal
  • Energy portal
  • Technology portal


  1. ^ a b c d “Solar Energy Perspectives: Executive Summary”. International Energy Agency. 2011. Archived from the original (PDF) on 3 Dec 2011. 
  2. ^ “Energy”. 
  3. ^ “2014 Key World Energy Statistics” (PDF). IEA. 2014. pp. 6, 24, 28. Archived from a strange on 5 May 2014. 
  4. ^ a b c d e f “Energy and a plea of sustainability” (PDF). United Nations Development Programme and World Energy Council. Sep 2000. Retrieved Aug 2015.  Check date values in: |access-date= (help)
  5. ^ Smil (1991), p. 240
  6. ^ “Natural Forcing of a Climate System”. Intergovernmental Panel on Climate Change. Retrieved 29 September 2007. 
  7. ^ “Radiation Budget”. NASA Langley Research Center. 17 Oct 2006. Retrieved 29 September 2007. 
  8. ^ Somerville, Richard. “Historical Overview of Climate Change Science” (PDF). Intergovernmental Panel on Climate Change. Retrieved 29 September 2007. 
  9. ^ Vermass, Wim. “An Introduction to Photosynthesis and Its Applications”. Arizona State University. Retrieved 29 September 2007. 
  10. ^ a b Smil (2006), p. 12
  11. ^
  12. ^ “Powering a Planet: Chemical hurdles in solar appetite utilization” (PDF). Retrieved 7 August 2008. 
  13. ^ “Energy acclimatisation by photosynthetic organisms”. Food and Agriculture Organization of a United Nations. Retrieved 25 May 2008. 
  14. ^ “Exergy Flow Charts – GCEP”. 
  15. ^ Archer, Cristina; Jacobson, Mark. “Evaluation of Global Wind Power”. Stanford. Retrieved 3 June 2008. 
  16. ^ “Renewable Energy Sources” (PDF). Renewable and Appropriate Energy Laboratory. p. 12. Retrieved 6 December 2012. 
  17. ^ “Total Primary Energy Consumption”. Energy Information Administration. Retrieved 30 June 2013. 
  18. ^ “Total Electricity Net Consumption”. Energy Information Administration. Retrieved 30 June 2013. 
  19. ^ a b Philibert, Cédric (2005). “The Present and Future use of Solar Thermal Energy as a Primary Source of Energy” (PDF). IEA. Archived from a strange on 12 Dec 2011. 
  20. ^ “Solar Energy Technologies and Applications”. Canadian Renewable Energy Network. Retrieved 22 October 2007. 
  21. ^ “C.V. Boys – Scientist”. 
  22. ^ Smith, Zachary Alden; Taylor, Katrina D. (2008). Renewable And Alternative Energy Resources: A Reference Handbook. ABC-CLIO. p. 174. ISBN 978-1-59884-089-6. 
  23. ^ a b “American Inventor Uses Egypt’s Sun for Power – Appliance Concentrates a Heat Rays and Produces Steam, Which Can Be Used to Drive Irrigation Pumps in Hot Climates – View Article –”. 2 Jul 1916. 
  24. ^ “Renewables for Heating and Cooling” (PDF). International Energy Agency. Retrieved 13 August 2015. 
  25. ^ Weiss, Werner; Bergmann, Irene; Faninger, Gerhard. “Solar Heat Worldwide (Markets and Contributions to a Energy Supply 2005)” (PDF). International Energy Agency. Archived from the original (PDF) on 10 Sep 2008. Retrieved 30 May 2008. 
  26. ^ a b c Weiss, Werner; Bergmann, Irene; Faninger, Gerhard. “Solar Heat Worldwide – Markets and Contribution to a Energy Supply 2006” (PDF). International Energy Agency. Archived from the original (PDF) on 10 Sep 2008. Retrieved 9 June 2008. 
  27. ^ “Renewables 2007 Global Status Report” (PDF). Worldwatch Institute. Archived from the original (PDF) on 29 May 2008. Retrieved 30 April 2008. 
  28. ^ Del Chiaro, Bernadette; Telleen-Lawton, Timothy. “Solar Water Heating (How California Can Reduce Its Dependence on Natural Gas)” (PDF). Environment California Research and Policy Center. Archived from the original (PDF) on 27 Sep 2007. Retrieved 29 September 2007. 
  29. ^ Apte, J.; et al. “Future Advanced Windows for Zero-Energy Homes” (PDF). American Society of Heating, Refrigerating and Air-Conditioning Engineers. Retrieved 9 April 2008. 
  30. ^ “Energy Consumption Characteristics of Commercial Building HVAC Systems Volume III: Energy Savings Potential” (PDF). United States Department of Energy. pp. 2–2. Retrieved 24 June 2008. 
  31. ^ Mazria (1979), pp. 29–35
  32. ^ Bright, David (18 Feb 1977). “Passive solar heating easier for a normal owner”. Bangor Daily News. Retrieved 3 July 2011. 
  33. ^ Mazria (1979), p. 255
  34. ^ Balcomb (1992), p. 56
  35. ^ Balcomb (1992), p. 57
  36. ^ Anderson and Palkovic (1994), p. xi
  37. ^ Butti and Perlin (1981), pp. 54–59
  38. ^ Anderson and Palkovic (1994), p. xii
  39. ^ Anderson and Palkovic (1994), p. xiii
  40. ^ Stine, W. B. Harrigan, R. W. “Shenandoah Solar Total Energy Project”. John Wiley. Retrieved 20 July 2008. 
  41. ^ Bartlett (1998), pp. 393–4
  42. ^ Thomson-Philbrook, Julia. “Right to Dry Legislation in New England and Other States”. Connecticut General Assembly. Retrieved 27 May 2008. 
  43. ^ a b “Solar Buildings (Transpired Air Collectors – Ventilation Preheating)” (PDF). National Renewable Energy Laboratory. Retrieved 29 September 2007. 
  44. ^ a b Leon (2006), p. 62
  45. ^ a b Tiwari (2003), pp. 368–371
  46. ^ a b Daniels (1964), p. 6
  47. ^ “SODIS solar H2O disinfection”. EAWAG (The Swiss Federal Institute for Environmental Science and Technology). Retrieved 2 May 2008. 
  48. ^ a b “Household Water Treatment Options in Developing Countries: Solar Disinfection (SODIS)” (PDF). Centers for Disease Control and Prevention. Archived from the original (PDF) on 29 May 2008. Retrieved 13 May 2008. 
  49. ^ “Household Water Treatment and Safe Storage”. World Health Organization. Retrieved 2 May 2008. 
  50. ^ Shilton A. N.; Powell N.; Mara D. D.; Craggs R. (2008). “Solar-powered aeration and disinfection, anaerobic co-digestion, biological CO(2) scrubbing and biofuel production: a appetite and CO government opportunities of rubbish stabilization ponds”. Water Sci. Technol. 58 (1): 253–8. doi:10.2166/wst.2008.666. PMID 18653962. 
  51. ^ Tadesse I.; Isoaho S. A.; Green F. B.; Puhakka J. A. (2003). “Removal of organics and nutrients from tannery effluent by modernized integrated Wastewater Pond Systems technology”. Water Sci. Technol. 48 (2): 307–14. PMID 14510225. 
  52. ^ International Energy Agency (2014). “Technology Roadmap: Solar Photovoltaic Energy” (PDF). IEA. Archived from a strange on 7 Oct 2014. Retrieved 7 October 2014. 
  53. ^ “Grid Connected Renewable Energy: Solar Electric Technologies” (PDF). 
  54. ^ Historical Data Workbook (2013 calendar year)
  55. ^ Perlin (1999), p. 147
  56. ^ “Magic Plates, Tap Sun For Power”, Jun 1931, Popular Science. Retrieved 19 April 2011. 
  57. ^ Perlin (1999), pp. 18–20
  58. ^ Perlin (1999), p. 29
  59. ^ Perlin (1999), pp. 29–30, 38
  60. ^ Antonio Luque. “Will we surpass 50% potency in photovoltaics?”. 
  61. ^ Martin and Goswami (2005), p. 45
  62. ^ “Darmstadt University of Technology solar decathlon home design”. Darmstadt University of Technology. Archived from the original on 18 Oct 2007. Retrieved 25 April 2008. 
  63. ^ a b c Schittich (2003), p. 14
  64. ^ Butti and Perlin (1981), pp. 4, 159
  65. ^ Balcomb (1992)
  66. ^ Rosenfeld, Arthur; et. al. “Painting a Town White — and Green”. Heat Island Group. Archived from the original on 14 Jul 2007. Retrieved 29 September 2007. 
  67. ^ Jeffrey C. Silvertooth. “Row Spacing, Plant Population, and Yield Relationships”. University of Arizona. Retrieved 24 June 2008. 
  68. ^ Kaul (2005), pp. 169–174
  69. ^ Butti and Perlin (1981), pp. 42–46
  70. ^ Bénard (1981), p. 347
  71. ^ “A Powerhouse Winery”. News Update. Novus Vinum. 27 Oct 2008. Retrieved 5 November 2008. 
  72. ^ Butti and Perlin (1981), p. 19
  73. ^ Butti and Perlin (1981), p. 41
  74. ^ “The WORLD Solar Challenge – The Background” (PDF). Australian and New Zealand Solar Energy Society. Archived from the original (PDF) on 19 Jul 2008. Retrieved 5 August 2008. 
  75. ^ “North American Solar Challenge”. New Resources Group. Retrieved 3 July 2008. 
  76. ^ “South African Solar Challenge”. Advanced Energy Foundation. Archived from the original on 12 Jun 2008. Retrieved 3 July 2008. 
  77. ^ “Vehicle auxiliary appetite applications for solar cells” (PDF). 1991. Retrieved 11 October 2008. 
  78. ^
  79. ^ Electrical Review Vol. 201, No. 7, 12 Aug 1977
  80. ^ Schmidt, Theodor. “Solar Ships for a new Millennium”. TO Engineering. Retrieved 30 September 2007. 
  81. ^ “The sun21 completes a initial transatlantic channel with a solar powered boat”. Transatlantic 21. Retrieved 30 September 2007. 
  82. ^ “PlanetSolar, a initial solar-powered round-the-world voyage”. PlanetSolar. Retrieved 14 August 2015. 
  83. ^
  84. ^ “Solar-Power Research and Dryden”. NASA. Retrieved 30 April 2008. 
  85. ^ “The NASA ERAST HALE UAV Program”. Greg Goebel. Archived from the original on 10 Feb 2008. Retrieved 30 April 2008. 
  86. ^ Solar Impulse Project. “HB-SIA Mission”. Retrieved 5 December 2009. 
  87. ^ “Phenomena that impact a solar balloon”. Retrieved 19 August 2008. 
  88. ^ Bolton (1977), p. 1
  89. ^ Wasielewski M. R. Photoinduced nucleus send in supramolecular systems for synthetic photosynthesis. Chem. Rev. 1992; 92: 435-461.
  90. ^ Hammarstrom L. and Hammes-Schiffer S. Artificial Photosynthesis and Solar Fuels. Accounts of Chemical Research 2009; 42 (12): 1859-1860.
  91. ^ Gray H. B. Powering a universe with solar fuel. Nature Chemistry 2009; 1: 7.
  92. ^ “Artificial photosynthesis as a limit record for appetite sustainability – Energy Environmental Science (RSC Publishing)”. 
  93. ^ Agrafiotis (2005), p. 409
  94. ^ Zedtwitz (2006), p. 1333
  95. ^ “Solar Energy Project during a Weizmann Institute Promises to Advance a use of Hydrogen Fuel”. Weizmann Institute of Science. Retrieved 25 June 2008. 
  96. ^ Balcomb(1992), p. 6
  97. ^ “Request for Participation Summer 2005 Demand Shifting with Thermal Mass” (PDF). Demand Response Research Center. Retrieved 26 November 2007. 
  98. ^ Butti and Perlin (1981), pp. 212–214
  99. ^ “Advantages of Using Molten Salt”. Sandia National Laboratory. Retrieved 29 September 2007. 
  100. ^ “PV Systems and Net Metering”. Department of Energy. Archived from the original on 4 Jul 2008. Retrieved 31 July 2008. 
  101. ^ “Pumped Hydro Storage”. Electricity Storage Association. Archived from the original on 21 Jun 2008. Retrieved 31 July 2008. 
  102. ^ Butti and Perlin (1981), pp. 63, 77, 101
  103. ^ Butti and Perlin (1981), p. 249
  104. ^ Yergin (1991), pp. 634, 653-673
  105. ^ “Chronicle of Fraunhofer-Gesellschaft”. Fraunhofer-Gesellschaft. Retrieved 4 November 2007. 
  106. ^ Butti and Perlin (1981), p. 117
  107. ^ Butti and Perlin (1981), p. 139
  108. ^ “IEA Says Solar May Provide a Third of Global Energy by 2060”. Bloomberg Businessweek. 1 Dec 2011. 


  • Agrafiotis, C.; et. al. (2005). “Solar H2O bursting for hydrogen prolongation with monolithic reactors”. Solar Energy. 79 (4): 409–421. Bibcode:2005SoEn…79..409A. doi:10.1016/j.solener.2005.02.026. 
  • Anderson, Lorraine; Palkovic, Rick (1994). Cooking with Sunshine (The Complete Guide to Solar Cuisine with 150 Easy Sun-Cooked Recipes). Marlowe Company. ISBN 1-56924-300-X. 
  • Balcomb, J. Douglas (1992). Passive Solar Buildings. Massachusetts Institute of Technology. ISBN 0-262-02341-5. 
  • Bénard, C.; Gobin, D.; Gutierrez, M. (1981). “Experimental Results of a Latent-Heat Solar-Roof, Used for Breeding Chickens”. Solar Energy. 26 (4): 347–359. Bibcode:1981SoEn…26..347B. doi:10.1016/0038-092X(81)90181-X. 
  • Bolton, James (1977). Solar Power and Fuels. Academic Press, Inc. ISBN 0-12-112350-2. 
  • Bradford, Travis (2006). Solar Revolution: The Economic Transformation of a Global Energy Industry. MIT Press. ISBN 0-262-02604-X. 
  • Butti, Ken; Perlin, John (1981). A Golden Thread (2500 Years of Solar Architecture and Technology). Van Nostrand Reinhold. ISBN 0-442-24005-8. 
  • Carr, Donald E. (1976). Energy a Earth Machine. W. W. Norton Co. ISBN 0-393-06407-7. 
  • Daniels, Farrington (1964). Direct Use of a Sun’s Energy. Ballantine Books. ISBN 0-345-25938-6. 
  • Denzer, Anthony (2013). The Solar House: Pioneering Sustainable Design. Rizzoli. ISBN 978-0847840052. 
  • Halacy, Daniel (1973). The Coming Age of Solar Energy. Harper and Row. ISBN 0-380-00233-7. 
  • Hunt, V. Daniel (1979). Energy Dictionary. Van Nostrand Reinhold Co. ISBN 0-442-27395-9. 
  • Karan, Kaul; et. al. (2001). “Row Orientation Affects Fruit Yield in Field-Grown Okra”. Journal of Sustainable Agriculture. 17 (2/3): 169–174. doi:10.1300/J064v17n02_14. 
  • Leon, M.; Kumar, S. (2007). “Mathematical displaying and thermal opening research of unglazed transpired solar collectors”. Solar Energy. 81 (1): 62–75. Bibcode:2007SoEn…81…62L. doi:10.1016/j.solener.2006.06.017. 
  • Lieth, Helmut; Whittaker, Robert (1975). Primary Productivity of a Biosphere. Springer-Verlag1. ISBN 0-387-07083-4. 
  • Martin, Christopher L.; Goswami, D. Yogi (2005). Solar Energy Pocket Reference. International Solar Energy Society. ISBN 0-9771282-0-2. 
  • Mazria, Edward (1979). The Passive Solar Energy Book. Rondale Press. ISBN 0-87857-238-4. 
  • Meier, Anton; et. al. (2005). “Solar chemical reactor record for industrial prolongation of lime”. Solar Energy. 80 (10): 1355–1362. Bibcode:2006SoEn…80.1355M. doi:10.1016/j.solener.2005.05.017. 
  • Mills, David (2004). “Advances in solar thermal electricity technology”. Solar Energy. 76 (1-3): 19–31. Bibcode:2004SoEn…76…19M. doi:10.1016/S0038-092X(03)00102-6. 
  • Müller, Reto; Steinfeld, A. (2007). “Band-approximated radiative feverishness send research of a solar chemical reactor for a thermal separateness of zinc oxide”. Solar Energy. 81 (10): 1285–1294. Bibcode:2007SoEn…81.1285M. doi:10.1016/j.solener.2006.12.006. 
  • Perlin, John (1999). From Space to Earth (The Story of Solar Electricity). Harvard University Press. ISBN 0-674-01013-2. 
  • Bartlett, Robert (1998). Solution Mining: Leaching and Fluid Recovery of Materials. Routledge. ISBN 90-5699-633-9. 
  • Scheer, Hermann (2002). The Solar Economy (Renewable Energy for a Sustainable Global Future). Earthscan Publications Ltd. ISBN 1-84407-075-1. 
  • Schittich, Christian (2003). Solar Architecture (Strategies Visions Concepts). Architektur-Dokumentation GmbH Co. KG. ISBN 3-7643-0747-1. 
  • Smil, Vaclav (1991). General Energetics: Energy in a Biosphere and Civilization. Wiley. p. 369. ISBN 0-471-62905-7. 
  • Smil, Vaclav (2003). Energy during a Crossroads: Global Perspectives and Uncertainties. MIT Press. p. 443. ISBN 0-262-19492-9. 
  • Smil, Vaclav (2006). Energy during a Crossroads (PDF). Organisation for Economic Co-operation and Development. ISBN 0-262-19492-9. Retrieved 29 September 2007. 
  • Tabor, H. Z.; Doron, B. (1990). “The Beith Ha’Arava 5 MW(e) Solar Pond Power Plant (SPPP)–Progress Report”. Solar Energy. 45 (4): 247–253. Bibcode:1990SoEn…45..247T. doi:10.1016/0038-092X(90)90093-R. 
  • Tiwari, G. N.; Singh, H. N.; Tripathi, R. (2003). “Present standing of solar distillation”. Solar Energy. 75 (5): 367–373. Bibcode:2003SoEn…75..367T. doi:10.1016/j.solener.2003.07.005. 
  • Tritt, T.; Böttner, H.; Chen, L. (2008). “Thermoelectrics: Direct Solar Thermal Energy Conversion”. MRS Bulletin. 33 (4): 355–372. 
  • Tzempelikos, Athanassios; Athienitis, Andreas K. (2007). “The impact of shading pattern and control on building cooling and lighting demand”. Solar Energy. 81 (3): 369–382. Bibcode:2007SoEn…81..369T. doi:10.1016/j.solener.2006.06.015. 
  • Vecchia, A.; et. al. (1981). “Possibilities for a Application of Solar Energy in a European Community Agriculture”. Solar Energy. 26 (6): 479–489. Bibcode:1981SoEn…26..479D. doi:10.1016/0038-092X(81)90158-4. 
  • Yergin, Daniel (1991). The Prize: The Epic Quest for Oil, Money, and Power. Simon Schuster. p. 885. ISBN 0-671-79932-0. 
  • Zedtwitz, P.V.; et. al. (2006). “Hydrogen prolongation around a solar thermal decarbonization of hoary fuels”. Solar Energy. 80 (10): 1333–7. Bibcode:2006SoEn…80.1333Z. doi:10.1016/j.solener.2005.06.007. 

External links

Wikimedia Commons has media associated to Solar energy.


Photovoltaic system


Generation systems

PV companies

Internal structure




Related topics








  • Category
    • agencies
    • law
    • management
    • ministries
    • organizations
  • Colleges
  • Natural resources

Article source:

دیدگاهتان را بنویسید

نشانی ایمیل شما منتشر نخواهد شد. بخش‌های موردنیاز علامت‌گذاری شده‌اند *