rajnish
TRANSCRIPT
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SOLAR COLLECTOR
BY:-RAJNISH KUMAR
Regd no:-1101214070Branch:-ELECTRICAL
ENGINEERING
UNDER THE GUIDANCE OF :-MINAKSHI SINGH
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Expose a dark surface
to solar radiation so
that the radiation is
absorbed. This heat is
then transferred to
thermal/heat storage
tank and utilized.
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CONCENTRATING TYPE NON-CONCENTRATING TYPE
(FLAT-PLATE COLLECTOR)A)LIQUID FLATE-PLATE COLLECTOR
B)FLAT-PLATE AIR-HEATING COLLECTOR
FOCUS TYPE
NON-FOCUS TYPEA)MODIFIED FLAT-PLATE COLLECTOR
B)COMPOUND-PARABOLIC CONCENTARING(CPC)TPYE
LINE FOCUS(ONE AXIS TRACKING)
A)Cylindrical parabolic concentractor
B)Fixed mirror solar concentratorC)Linear Fresnel lens collector
POINT FOCUS(TWO-AXIS TRACKING)A)Paraboloidal dish collector
B)Hemispherical bowl mirror conc.C)Circular Fresnel lens conc.
D)Central Tower receiver
FLATE PLATE COLLECTOR
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• Consist of casing, absorber plate, transparent glass covers, insulating material and fluid passage tubes.
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• Device that collects solar radiation and heats a coolant, which in turn will be used in residential settings to heat water or the home.
A flat-plate collector is placed at a point such that its length aligns with the line of longitude and is suitably titled towards south to have maximum collection.
Here, β=Tilt Angle or slope of plateβ 6
Θz=Zenith angle
α=inclination angle
γs=solar azimuth angle
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φ=angle of latitudeΔ=declination
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Θi=angle of
incidence,ω=hour angle β=tilt angle
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It is similar to LFPC with change in the configuration of the absorber and tube.Air is used directly as the working fluid.Pressure no becomes very high
inside the collector.
It increase concentration of solar radiation on the flat absorber.
It has a large acceptance angle and increase the concentration ratio.
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Reflector &metal tube receiver at its focal line.black receiver tube increase
absorption.It rotate about one axis to track the sun.
It consist of fine ,linear grooves on the surface of the reflecting material on one side & flat on the other side
is used.A concentration ratio of 10 to 30 may be realized which yeld temp 150 to 300 degree.
It consist long narrow fixed mirror strip on the
circular reference cylinder with a tracking receiver tube.Tube is made to
rotate about the centre of curvature of the reflector
module to track the sun.the concentration ratio near same as the number of mirror strip.
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It rotate about its optical axis aparaboloidal shape is produced.Beamradiation is focused at a point in theparaboloid.Required two axistracking.PDC of 6-7m in diameter arecommercially manufactured.
It consist hemispherical fixed mirror a tracking absorber and a supporting
structure.All ray enter & after reflection cross the paraxial line at the some pt b/n
the focus and the mirror surface.
It is used where high flux is desired such as with silicon solar cells or gallium arsenide solar cells as receiver.It divided number of thin circular zones.theconcentration ratio may be high as 2000 but less than paraboloidalreflector.Tracking is required to keep the small solar image centered on the receiver.
In CTRC the receiver is located at top of the tower.Thousands of such heliostats track the sun to direct the beam radiation on the receiver from all sides.Concentration ratio of as high a value as 3000 can be obtained.Theabsorbed energy can be extracted from the receiver and delivered at a temp and pressure suitable for driving turbines for power generation.
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Solar energy should be given a chance if we want to protect the environment. We own it to our children, our grandchildren and the generations to come.
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