Solar power plant
Upcoming SlideShare
Loading in...5
×
 

Solar power plant

on

  • 699 views

 

Statistics

Views

Total Views
699
Views on SlideShare
699
Embed Views
0

Actions

Likes
1
Downloads
102
Comments
0

0 Embeds 0

No embeds

Accessibility

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Solar power plant Solar power plant Presentation Transcript

  • SOLAR POWER PRESENTED BY : SALIL.N.M ROLL NO : 39 S1,S2 MECH DATE : 29-11-2013
  • SUMMARY SOLAR POWER  SOLAR COLLECTORS * FLAT PLATE COLLECTORS * FOCUSSING COLLECTORS  SOLAR THERMAL POWER GENERATION * Low temperature cycle * Medium temperature cycle * High temperature cycle   PHOTO VOLTAIC
  • SOLAR POWER 
  •  The portion of the incident solar radiation which comes directly from the apparent solar disc is called Direct or Beam Radiation.  The solar radiation received from the sun after reflection and scattering by the atmosphere is called Diffuse radiation.  Total radiation=diffused radiation + direct radiation
  • ADVANTAGE DISADVANTGE  Non-polluting  Non nature  Inexhaustable source  Can be readily harnessed without affecting the environment availability during nights and during periods of cold weather
  • USES  Operate engines  To power refrigerators  To heat water  To heat and cool buildings  To run pumps  Sewage  Powers treatment plants cars, ovens, water stills, furnaces, distillation equipments , crop driers
  • SOLAR COLLECTORS In most of the devices utilising solar energy, the solar energy in the radiant energy form is converted in to heat energy using mechanical devices known as solar collector. The solar collector absorbs incident solar radiation and transfer the energy to a fluid passing in contact with it.
  • FLAT PLATE COLLECTOR  In flat-plate collectors there is no optical concentration of sunlight and they are generally stationary . In addition to this their outlet temperature capability is below 100 °C A flat plate collector is basically a black surface that is placed at a convenient path of the sun. And a typical flat plate collector is a metal box with a glass or plastic cover (called glazing) on top and a dark-colored absorber plate on the bottom. The sides and bottom of the collector are usually insulated to minimize heat loss
  • Flat plate collectors
  • Based on type of heat transfer fluid used it is divided in to two  Liquid heating collectors employ water or other non freezing solutions as working fluid  Air or gas heating collectors employ air or gas as the working fluid
  • Components of a typical flat plate collector  Absorber plate:  Flow passages: It is usually made of copper , steel or plastic. The surface is covered with a flat black material of high absorbance. If copper or steel is used it is possible to apply a selective coating that maximizes the absorbance of solar energy and minimizes the radiation emitted by plate. The flow passages conduct the working fluid through the collector. If the working fluid is a liquid , the flow passage is usually a tube that is attached to or is a part of absorber plate. If the working fluid is air , the flow passage should be below the absorber plate to minimize heat lssues.
  •  Cover plate: To reduce convective and radiative heat losses from the absorber , one or two transparent covers are generally placed above the absorber plate. They usually be made from glass or plastic.  Insulation: These are some materials such as fiberglass and they are placed at the back and sides of the collector to reduce heat losses.  Enclosure: A box that the collector is enclosed in holds the components together, protect them from weather, facilitates installation of the collector on a roof or appropriate frame.
  • Cross section of a basic flat-plate solar collector
  • Flat plate collectors used for heating buildings
  • Flat-plate collectors used for heating swimming pools
  • FOCUSSING COLLECTORS In concentrating solar collectors the incident solar energy is reflected and made to concentrate at a convenient point. They are classified by  According to type of reflecting medium: parabolic, spherical or flat concentrators  According to the optics : point focus system, line focus system
  • Parabolic concentrating collector Spherical concentrating collector Flat concentrating collector
  • Point focusing system Line Focusing collector
  •  Low Solar thermal power generation temperature cycle : use flat plate collectors. Maximum temperature limit is up to 100°C  Medium temperature cycle: works at temperature range 150 to 300°C High temperature cycle: above 300°C works at temperature range
  • Low temperature system Heat exchanger Turbine ~ Condenser pump
  • Organic fluids like ammonia, freon, etc which evaporates at lower temperature is utilised to run the turbine Medium temperature system Utilises cylindrical or parabolic solar concentrators which can easily give temperature up to 300°C. In this system steam is directly generated in the concentrators and is used to drive the turbine
  • High temperature system
  • Photo Voltaic Photo voltaic effect (PV) effect is defined as the generation of an electromotive force as a result of the absorption of ionising radiation Solar cell are usually made of a single crystal silicon, gallium arsenide is another solar cells material.
  • Physics of Photovoltaic Generation n-type semiconductor + + + + + + + + + + + + + + + - - - - - - - - - - - - - - - - - - Depletion Zone p-type semiconductor
  • It needs little maintenance, it is long lived, its energy source is unlimited and it can be made from raw materials which are available in huge quantities. Produce very little power at very high cost. Output is not constant and it varies with the time of the day
  • Photovoltaic System Typical output of a module (~30 cells) is ≈ 15 V, with 1.5 A current
  • APPLICATIONS OF SOLAR ENERGY SOLAR WATER HEATER SOLAR COOKER
  • THANK YOU SPECIAL THANKS TO : RAVIPRASAD SIR