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Message: <blockquote data-quote="Tharutani San" data-source="post: 18886868" data-attributes="member: 519915"><img src="/styles/default/xenforo/smilies/default/eek.gif"  class="smilie" loading="lazy" alt=":eek:" title="eek    :eek:" data-shortname=":eek:" /> Nice explanation bro TFS But seems tech is constantly moving forward. I Hope <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" />                             <img src="http://s.hswstatic.com/gif/solar-energy-night-2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />An array of collectors is able to collect energy from the sun that is stored for later use.       Image courtesy of <a href="http://www.sandia.gov/" target="_blank">Sandia National Laboratories</a>          And this is where the breakthrough comes in: Heat is easy to store.That's  essentially what the thermos is doing, storing the heat of that coffee.  And heat generates electricity in a solar-thermal power plant, so  storing heat is a way to pause the process: Let the sun heat something  up, keep that thing hot until the sun goes down, and then use that heat  to generate the steam that turns the turbine.Of course, as  relatively easy as it is to store heat, you've got to find the right  substance for a solar-power application. To store the extreme heat that  runs a solar-thermal power plant, the substance has to remain stable at  high temperatures -- in the area of 750 degrees F (400 degrees C) --  otherwise you'd run into problems with vaporizing and pressure changes  [source: <a href="http://www.sciam.com/article.cfm?id" target="_blank">Bielo</a>]. It's also helpful is the substance is cheap and readily available.Enter  that white, crystalline stuff in your cupboard that you probably put on  your scrambled eggs, your margarita glass and your edamame: salt. Salt  melts at only very high temperatures, vaporizes at very, very high  temperatures and it's available in virtually unlimited, low-cost supply.  Plus, it only loses about 7 percent of the energy put into it [source: <a href="http://www.sciam.com/article.cfm?id" target="_blank">Bielo</a>].Actually,  the first salt-storage-equipped solar power plant isn't using table  salt. It's using a different salt mixture often applied as fertilizer, a  combination of sodium and potassium nitrate. The Andasol 1 power plant  in Grenada, Spain, is packed with 30,865 tons (28,000 metric tons) of  the stuff [source: <a href="http://www.sciam.com/article.cfm?id" target="_blank">Bielo</a>].                                             The Andasol 1 plant in Spain started generating power in November  2008, and as long as the sun is shining, it operates pretty much like  any other solar-thermal power plant. Sunlight strikes some sort of solar  collector -- in this case, a field of parabolic-trough mirrors focused  on tubes filled with oil, which warms to more than 752 degrees Farenheit  (400 degrees Celsius). That hot oil is used to boil water, which  produces steam, which spins a turbine.It's only when the sun isn't shining that the storage system affects power generation. The setup goes like this:The  field of solar collectors at Andasol 1 is big enough to collect almost  twice as much sunlight as the plant needs to operate during sunny times.  The extra heated oil is sent to a heat exchanger running between giant  vats of molten salt. One vat holds relatively cool molten salt (about  500 degrees F or 260 degrees C). That salt is pumped into the heat  exchanger, where it picks up heat from the oil. The now hotter molten  salt (752 degrees F or 400 degrees C) flows into the second vat, where  it waits until the sun dips behind a cloud.When the power plant  needs the stored heat, the hotter molten salt is pumped back through the  heat exchanger. There, it transfers its heat to the oil that will  generate steam. The hotter oil travels to the power center, and the  now-cooler molten salt flows back into the cooler tank. The process then  starts all over.Using salt to store the sun's heat, the plant  can operate without sunlight, running almost twice as long as other  solar power plants. The salt-storage setup lets Andasol 1 generate 50  percent more energy than it would without it -- 178,000 megawatt-hours  of electricity [source: <a href="http://spectrum.ieee.org/oct08/6851" target="_blank">Fairly</a>].  That extra generating ability lowers the overall cost of the plant's  electricity. It could eventually rival the cost of natural-gas power.This  type of salt storage isn't the only design on the table for storing the  sun's energy. Some plants are looking at using a more direct approach  that skips the oil -- they would both collect and store the sun's heat  in salt. Sand is another potential heat-storage material.And  another group has developed a system that mimics the molecular effects  of photosynthesis to store solar power: It uses sunlight to split water  molecules into hydrogen and oxygen, which are then put back together in a  fuel cell.<a href="http://science.howstuffworks.com/environmental/green-tech/energy-production/solar-energy-night2.htm" target="_blank">REad more</a>                                       <a href="http://science.howstuffworks.com/environmental/green-tech/energy-production/solar-energy-night.htm" target="_blank">                         </a></blockquote>

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