Which of the following is the advantage of flat plate collectors of solar?

Solar Flat plate collector:

• It is basically a solar thermal energy collector in which solar energy is collected by absorbing radiation in an absorber and then transferring to a fluid. 
• It can be used for a variety of applications in which temperatures ranging from 40 degrees Celsius to about 100 degrees Celsius are required.
• Flat plate collectors have no optical concentrator and the collector area as well as the absorber area are numerically the same.
• The main advantage of a flat plate collector is that the beam and diffuse components of the solar radiation. In addition because of its simple stationery design, its construction is easy.
• Conventional flat plate collector with a spectrally selective absorber and single glazing has an efficiency of approximately 20 % only, whereas vacuum tube collectors reach about 50 %.

Merits of Flat plate collectors of Solar:

• Easy to manufacture.
• Low cost.
• Collect both beam and diffuse radiation.
• Permanently fixed (no sophisticated positioning or tracking equipment is required)
• Little maintenance.
  

The basic parts that make up a liquid flat plate collector are:

• The absorber plate
• The tubes fixed to the absorber plate through which the liquid to be heated flows
• The transparent cover
• The collector box