Solar Collectors

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					Solar Collectors
       Cristal Acosta
         Liliana Brito
       Diana Morales
        Romario Rios
What is it?
 A solar collector is
  a device that
  captures sunlight
  (solar energy) and
  converts it into
  heat, which is used
  to heat water
     Difference between Solar
     Collectors and Solar Panels
 Solar collectors produce solar energy in the
  form of heat and solar panels produce solar
  energy in the form of electricity
 Solar collectors make use of the Greenhouse
  Effect and solar panels convert radiant
  energy into electricity
How does it work?
 A solar collector works best in direct sunlight,
  as sun-rays, and passes through the
  transparent glass, which hits the black surface
  of the absorber. It’s usually made up of two
  narrow metal strips. The black coating on the
  absorber transforms the radiation of the sun-
  rays into heat. The heat is carried out to the
  tubes by fin. The tube carries the water,
  which receives heat from the tube and gets
  hot. The thermal insulation at the back of the
  absorber helps reduce heat losses and
  increases the efficiency of the solar collector.
Technology?
 Require mechanical power, such as electric
  pumps, the absorber, and other devices
 The absorber is usually made up of several
  narrow metal strips
 These devices help move air, water, or other
  fluids to a spot where the heat is stored until
  used by active solar energy systems
Pros of Solar Collectors
 It can be captured easily
 There is no pollution or waste products
 Our country won’t need to depend on foreign
  power
 Energy is produced and used for free
 There are no lose parts to hurt wildlife
Cons of Solar Collectors
 We would need a different way to power
  places at night when the sun doesn’t shine
 Take up a lot of space
 Require expensive chemical batteries, which
  would make the use of solar power more
  expensive than that of the same amount of
  fossil fuels and nuclear power
 Bad weather conditions could decrease the
  amount of power produced
Specific Location

Residential areas
Swimming pools
Commercial buildings
Examples
 Flat-plate collectors are the most common solar
  collector for water heating systems at homes.
  Atypical flat-plate collector is a metal box with a
  glass or plastic cover and a dark absorber plate. It
  heats fluids or air at temperatures less than 180°F.
 Evacuated-tube collectors are more useful at high
  temperatures. It is composed of parallel rows of
  transparent glass tubes. Each tube has a glass outer
  tube and a metal absorber tube attached to a fin. The
  fin is covered with a coating that absorbs solar
  energy well, but reduce heat loss. Air is removed
  from the space between the two glass tubes to form
  a vacuum, which eliminates heat loss.
Environmental Impacts
Lead-acid batteries are not properly
 disposed and recycling is not always
 available
Hard to recycle heavy metals, such as
 cadmium
Cannot put solar collectors in one or
 just a few areas because it can cause
 everything from changes in local rain
 conditions to another Ice Age

				
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