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Regency Institute of Technology , Yana
Paper presentation by:-
P.Veerababu10ME041
G.Vamsidhar10ME017
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WHYSOLAR ENERGY??
WHYIN SPACE??
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Collecting Unit
Transmitting Unit
Receiving Unit
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Collecting Unit A Geosynchronous satellite containing
photovoltaic arrays. PV arrays convert Solar Energy into Radio
frequencies or D.C Electricity. PV arrays units align themselves
facing the sun by Solar trackers. Mirrors are used to intensify the
incident rays A typical ground unit can produce only 20% of that of
space unit.
l
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Microwave Transmission
Laser Transmission
MODES OF TRANSMISSION
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MicrowaveTransmission
Microwaves are Electromagnetic wavesthat travel at the velocity
of light.
Lossless propagation Point to Point
No massIndependent of gravitational
potential b/w two points.
Basic needs to be fulfilled by the
microwave transmission 5.8 GHz (ISM Band) 44,000 km Mass energy
transfer through a
beam of radius 7.5km
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The process of transmission is visualized here
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LEMUR
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IF ALL THE REQUIRED CONDITIONS ARE FULFILED THE EFFICIENCY
WILLBE
54% IT IS CLOSE TO THE MAXIMUM EXPECTED VALUE OF ACHIEVEMENT AND
GREATER VALUES SHOULDNT BE
EXPECTED
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LASER TRANSMISSION
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LASER PROPOGATION IS VISUALIZED BELOW
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Advantages of laser based energy transfer compared withother
wireless methods are:
Collimated monochromatic wavefront propagation allowsnarrow beam
cross-section area for energy transmissionover large ranges.
Compact size of solid state lasers-photovoltaics semiconductor
diodes fit into small products.
No radio-frequency interference to existing radiocommunication
such as Wi-fi and cell phones.control of access; only receivers
illuminated by the laserreceive power.
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ITS ONLY A MATTER OF PUBLIC PERCEPTION !!
Microwaves are generally used in microwaves for cooking.
Laser transmission or transmission through light energymight be
hazardous.
But the intensities of both the mediums areweaker than the
sunlight..!
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RECEIVING UNITRECTENNA
An antenna comprising a mesh of dipoles and diodes for absorbing
microwave energyfrom a transmitter and converting it into electric
energy is called a Rectenna
SANDWICH CONCEPT
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The distance between the antenna and rectenna will be roughly
thedistance from Earth to geosynchronous orbit (22,300 miles)
For best efficiency the satellite antenna must be circular
between 1 and1.5 kilometers in diameter
The ground rectenna would need to be elliptical and around
14kilometers by 10 kilometers
Microwaves are received with about 85% efficiency , around 5km
across
(3.1 miles)95% of the beam will fall on the rectenna.
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BENEFITS OF S.B.S.P
Higher collection rate
Longer collection period
Pollution free
Elimination of plant and wildlife interference
Redirectable power transmission
Scope for advancement in technology
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SUMMARY
SBSP is complex engineering challenge, butrequires no new
physics to become reality.
A design to meet its every need.
Requires high amounts of precision.
Economical, Ecological, Endless.
Boon to the present world to become advanced.
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