Renewable energy

ALTERNATIVE ENERGYRESOURCES

Guided by,Mr.D.R.Rajendran

Presented by,

Manigandan.V Perumal .S

Adhiparasakthi Engineering College

RENEWABLE ENERGY

• The renewable energy sources are energy supplies that are refilled by natural processes as least as fast as we use them. All renewable energy comes ultimately from the main source, the sun. We can use the sun directly (as in solar heating system) or indirectly (as in hydroelectric power, wind power, and power from biomass fuel).

a) Hydropower, b) Solar energy, c) Biomass, d) Geothermal, e) Wind power, etc.

Types of renewable energy:

• The main source of the solar energy is THE SUN. In early stages the solar energy is not used as renewable energy. But now a day after completion of several research over solar energy to convert it as useful power. There are several applications which mainly works based on the solar energy. Some of the main applications of solar energy are water heater, street light, vehicles, etc.

Solar Energy

• a). Initial cost is only required, then it uses the energy from sun.

• b). Less maintenance is required.• c). Eco-friendly (pollution free), etc.

Importance of solar energy:

• Solar energy is not directly converted into useful power. First the solar energy should be collected by using the solar collectors. Solar energy collectors are special kind of heat exchangers that transform solar radiation energy to internal energy of the transport medium.

Solar collectors

1). Stationary collectors a) Flat-plate collectors, * Glazing materials * Collector absorbing plates.

b)Compound parabolic collectors c) Evacuated tube collectors.

2). Sun tracking concentrating collectors

a) Parabolic trough collectors

b) Linear Fresnel reflector. c) Parabolic dish reflector (PDR) d) Heliostat field collector

Types of solar collectors

• Solar energy collectors are basically distinguished by their motion, i.e. stationary, single axis tracking and two axes tracking, and the operating temperature. These collectors are permanently fixed in position and do not track the sun.

Stationary collectors

a) Flat-plate collectors(FPC)

b) Compound parabolic collectors (CPC)

c) Evacuated tube collectors (ETC)

• Energy delivery temperatures can be increased by decreasing the area from which the heat losses occur. This is done by interposing an optical device between the source of radiation and the energy absorbing surface.

• Concentrators can be reflectors or refractors, can be cylindrical or parabolic and can be continuous or segmented.

Sun tracking concentrating collectors

a) Parabolic trough collectors (PTC)

b) Linear Fresnel reflector (LFR)

c) Parabolic dish reflector (PDR)

d) Heliostat field collector(HFL)

QUANTUM DOTS

SOLAR CELLS

E=hc/λSo,Eλ

We know that,

Conduction of electrons from valance band to conduction band

EFFICIENCY OF ORDINARY SOLAR CELLS(SI,Ge, etc..)

QUANTUM DOT SOLAR CELL = (2×ORDINARY SOLAR CELL)Energy in

Applications of

solar power

Street Light

Telecommunication system

Solar panel with pv system

Satellite

• Still lots of scientists and young engineers are designing new types of applications that can be used under solar power.

• Research over the quantum dots solar cells are ongoing. If that research succeed then our future generation will survive.

• So, finally we conclude that usage of alternative energy should increase in order to save our earth from various hazards.

Conclusion

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Anshumita Ganguly and Kaiwan J. Elavia Indian School of Mines, Dhanbad, Jharkhand, India

REFERENCES

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