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Post on 14-Nov-2014
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ABSTRACT
The world cannot continue to rely for long on fossil fuels for its energy
requirements. Fossil fuel reserves are limited. In addition, when burnt, these add to global
warming, air pollution and acid rain.So solar photovoltaic systems are ideal for providing
independent electrical power and lighting in isolated rural areas that are far away from
the power grid. These systems are nonpolluting,don’t deplete the natural resources and
are cheap in the long run.The aim of this project is to demonstrate how we can utilise
solar light to electrify the remote areas, i.e., how we can store the solar energy and then
use it for small-scale lighting applications.
CHAPTER 1INTRODUCTION
WHY DO WE NEED ALTERNATIVES?
fossil fuels are not, for all practical purposes, renewable. At current rates, the
world uses fossil fuels 100,000 times faster than they can form. The demand for them
will far outstrip their availability in a matter of centuries-or less. And although
technology has made extracting fossil fuels easier and more cost effective in some cases
than ever before, such is not always the case. As we deplete the more easily accessible oil
reserves, new ones must be found and tapped into. This means locating oil rigs much
farther offshore or in less accessible regions; burrowing deeper and deeper into the earth
to reach coal seams or scraping off ever more layers of precious topsoil; and entering into
uncertain agreements with countries and cartels with whom it may not be in our best
political interests to forge such commitments. Finally, there are human and
environmental costs involved in the reliance on fossil fuels. Drilling for oil, tunneling
into coalmines, transporting volatile liquids and explosive gases-all these can and have
led to tragic accidents resulting in the destruction of acres of ocean, shoreline and land,
killing humans as well as wildlife and plant life. Even when properly extracted and
handled, fossil fuels take a toll on the atmosphere, as the combustion processes release
many pollutants, including sulfur dioxide-a major component in acid rain. When another
common emission, carbon dioxide, is released into the atmosphere, it contributes to the
"greenhouse effect," in which the atmosphere captures and reflects back the energy
radiating from the earth's surface rather than allowing it to escape back into space.
Scientists agree that this has led to global warming, an incremental rise in average
temperatures beyond those that could be predicted from patterns of the past. This affects
everything from weather patterns to the stability of the polar ice caps
WHAT IS SOLAR ENERGY
Solar energy is the radiant light and heat from the Sun that has been harnessed by
humans since ancient times using a range of ever-evolving technologies. Solar radiation
along with secondary solar resources such as wind and wave power, hydroelectricity and
biomass account for most of the available renewable energy on Earth. Only a minuscule
fraction of the available solar energy is used.
Solar power provides electrical generation by means of heat engines or
photovoltaics. Once converted its uses are only limited by human ingenuity. A partial list
of solar applications includes space heating and cooling through solar architecture,
potable water via distillation and disinfection, daylighting, hot water, thermal energy for
cooking, and high temperature process heat for industrial purposes.
Solar technologies are broadly characterized as either passive solar or active solar
depending on the way they capture, convert and distribute sunlight. Active solar
techniques include the use of photovoltaic panels, solar thermal collectors, with electrical
or mechanical equipment, to convert sunlight into useful outputs. Passive solar
techniques include orienting a building to the Sun, selecting materials with favorable
thermal mass or light dispersing properties, and designing spaces that naturally circulate
air
CIRCUIT DIAGRAM
BRIEF DESCRIPTION ABOUT CIRCUIT COMPONENTS
Step down single phase transformer (230v/12v AC ,1A)
Integrated Circuit 7808
Solar panel(12V-16V)
Bridge rectifier
Diodes(IN 4007)
Capacitor (2200 micro farad 35V)
Resistors(1k,100)
Battery (6V,4.5 AH)
Relay (12v,200ohms)
DPDT switch
LED’s
Push to on switch
On/off switch
Lamp(3 W)
CIRCUIT DESCRIPTION
Solar cells generate direct current, so make sure that DPDT switch S1 is towards
the solar panel side. The DC voltage from the solar panel is used to charge the battery and
control the relay. Capacitor C1 connected in parallel with a 12V relay coil remains
charged in daytime until the relay is activated.Capacitor C1 is used to increase the
response time of the relay, so switching occurs moments after the voltage across it falls
below 12V. Capacitor C1 also filters the rectified output if the battery is charged through
AC power. The higher the value of the capacitor, the more the delay in switching. The
switching time is to be properly adjusted because the charging would practically stop in
the early evening while we want the light to be ‘on’ during late evening.
During daytime, relay RL1 energises provided DPDT switch S1 is towards the
solar panel side. Due to energisation of relay RL1, the positive terminal of the battery is
connected to the output of regulator IC 7808 (a 3-terminal, 1A, 8V regulator) via diode
D1 and normally-open (N/O) contacts of relay RL1. Here we have used a 6V, 4.5Ah
maintenance-free, lead-acid rechargeable battery. It requires a constant voltage of approx.
7.3 volts for its proper charging. Even though the output of the solar panel keeps varying
with the light intensity, IC 7808 (IC1) is used to give a constant output of 8V. Diode D1
causes a drop of 0.7V, so we get approx. 7.3V to charge the battery.LED1 indicates that
the circuit is work working and the battery is in the charging mode.
At night, there will be no generation of electricity. The relay will not energise and
charging will not take place. The solar energy stored in the battery can then be used to
light up the lamp. A 3W lamp glows continuously for around 6 hours if the battery is
fully charged. Instead of a 3W lamp, you can also use a parallel array of serially
connected white LEDs and limiting resistors to provide sufficient light for even longer
duration. In case the battery is connected in reverse polarity while charging, IC 7808 will
get damaged. The circuit indicates this damage by lighting up LED2, which is connected
in reverse with resistor R2. However, the circuit provides only the indication of reverse
polarity and no measure to protect the IC. A diode can be connected in reverse to the
common terminal of the IC but this would reduce the voltage available to the battery for
charging by another 0.7 volt. There is also a provision for estimating the approximate
voltage in the battery. This has been done by connecting ten 1N4007 diodes (D2 through
D11) in forward bias with the battery. The output is taken by LED3 across diodes D2,
D3, D4 and D5, which is equal to 2.8V when the battery is fully charged.LED3 lights up
at 2.5 volts or above. Here it glows with the voltage drop across the four diodes, which
indicates that the battery is charged. If the battery voltage falls due to prolonged
operation, LED3 no longer glows as the drop across D2, D3, D4 and D5 is not enough to
light it up. This indicates that the battery has gone weak. Micro switch S1 has been
provided to do this test whenever you want If the weather is cloudy for some consecutive
days, the battery will not charge. So a transformer and full-wave rectifier have been
added to charge the battery by using DPDT switch S1. This is particularly helpful in
those areas where power supply is irregular; the battery can be charged whenever mains
power is available
STEP DOWN SINGLE PHASE TRANSFORMER (230V/12V AC ,1A)
A transformer is a device that transfers electrical energy from one circuit to
another through inductively coupled conductors — the transformer's coils or "windings".
Except for air-core transformers, the conductors are commonly wound around a single
iron-rich core, or around separate but magnetically-coupled cores. A varying current in
the first or "primary" winding creates a varying magnetic field in the core (or cores) of
the transformer. This varying magnetic field induces a varying electromotive force
(EMF) or "voltage" in the "secondary" winding. This effect is called mutual induction. If
a load is connected to the secondary, an electric current will flow in the secondary
winding and electrical energy will flow from the primary circuit through the transformer
to the load. In an ideal transformer, the induced voltage in the secondary winding (VS) is
in proportion to the primary voltage (VP), and is given by the ratio of the number of turns
in the secondary to the number of turns in the primary as follows
By appropriate selection of the ratio of turns, a transformer thus allows an
alternating current (AC) voltage to be "stepped up" by making NS greater than NP, or
"stepped down" by making NS less than NP. Transformers come in a range of sizes from
a thumbnail-sized coupling transformer hidden inside a stage microphone to huge units
weighing hundreds of tons used to interconnect portions of national power grids. All
operate with the same basic principles, although the range of designs is wide. While new
technologies have eliminated the need for transformers in some electronic circuits,
transformers are still found in nearly all electronic devices designed for household
("mains") voltage. Transformers are essential for high voltage power transmission, which
makes long distance transmission economically practical
Fig An ideal step-down transformer showing magnetic flux in the core
RELAY
.
CHAPTER 3
GENERATION OF ELECTRICITY USING SOLAR ENERGY
ENERGY FROM THE SUN
The Earth receives 174 petawatts (PW) of incoming solar radiation (insulations)
at the upper atmosphere. Approximately 30% is reflected back to space while the rest is
absorbed by clouds, oceans and land masses. The spectrum of solar light at the Earth's
surface is mostly spread across the visible and near-infrared ranges with a small part in
the near-ultraviolet.
Earth's land surface, oceans and atmosphere absorb solar radiation, and this raises
their temperature. Warm air containing evaporated water from the oceans rises, causing
atmospheric circulation or convection. When the air reaches a high altitude, where the
temperature is low, water vapor condenses into clouds, which rain onto the Earth's
surface, completing the water cycle. The latent heat of water condensation amplifies
convection, producing atmospheric phenomena such as wind, cyclones and anti-cyclones.
Sunlight absorbed by the oceans and land masses keeps the surface at an average
temperature of 14 °C.By photosynthesis green plants convert solar energy into chemical
energy, which produces food, wood and the biomass from which fossil fuels are derived
The total solar energy absorbed by Earth's atmosphere, oceans and land masses is
approximately 3,850,000 exajoules (EJ) per year. In 2002, this was more energy in one
hour than the world used in one year. Photosynthesis captures approximately 3,000 EJ
per year in biomass. The amount of solar energy reaching the surface of the planet is so
vast that in one year it is about twice as much as will ever be obtained from all of the
Earth's non-renewable resources of coal, oil, natural gas, and mined uranium combined.
From the table of resources it would appear that solar, wind or biomass would be
sufficient to supply all of our energy needs, however, the increased use of biomass has
had a negative effect on global warming and dramatically increased food prices by
diverting forests and crops into biofuel production. As intermittent resources, solar and
wind raise other issues
SOLAR CELL
really called "photovoltaic", "PV" or "photoelectric" cells) that convert
light directly into electricity. In a sunny climate, you can get enough power to run a
100W light bulb from just one square metre of solar panel.
solar cell or photovoltaic cell is a device that converts sunlight directly into
electricity by the photovoltaic effect. Sometimes the term solar cell is reserved for
devices intended specifically to capture energy from sunlight, while the term photovoltaic
cell is used when the light source is unspecified. Assemblies of cells are used to make
solar panels, solar modules, or photovoltaic arrays. Photovoltaics are the field of
technology and research related to the application of solar cells in producing electricity
for practical use. The energy generated this way is an example of solar energy
Solar panels (arrays of photvoltaic cells) make use of renewable energy from the
sun, and are a clean and environmentally sound means of collecting solar energy.
THREE GENERATIONS OF SOLAR CELLS
Solar Cells are classified into three generations which indicates the order of which
each became important. At present there is concurrent research into all three generations
while the first generation technologies are most highly represented in commercial
production, accounting for 89.6% of 2007 production
FIRST GENERATION
First generation cells consist of large-area, high quality and single junction
devices. First Generation technologies involve high energy and labor inputs which
prevent any significant progress in reducing production costs. Single junction silicon
devices are approaching the theoretical limiting efficiency of 33%[7] and achieve cost
parity with fossil fuel energy generation after a payback period of 5–7 years.
SECOND GENERATION
Second generation materials have been developed to address energy requirements
and production costs of solar cells. Alternative manufacturing techniques such as vapour
deposition, electroplating, and use of Ultrasonic Nozzles are advantageous as they reduce
high temperature processing significantly. It is commonly accepted that as manufacturing
techniques evolve production costs will be dominated by constituent material
requirements,[7] whether this be a silicon substrate, or glass cover. Second generation
technologies are expected to gain market share in 2008
The most successful second generation materials have been cadmium telluride
(CdTe), copper indium gallium selenide, amorphous silicon and micromorphous silicon.
[6] These materials are applied in a thin film to a supporting substrate such as glass or
ceramics reducing material mass and therefore costs. These technologies do hold promise
of higher conversion efficiencies, particularly CIGS-CIS, DSC and CdTe offers
significantly cheaper production costs
Among major manufacturers there is certainly a trend toward second generation
technologies, however commercialisation of these technologies has proven difficult.[9] In
2007 First Solar produced 200 MW of CdTe solar cells making it the fifth largest
producer of solar cells in 2007 and the first ever to reach the top 10 from production of
second generation technologies alone.[9] Wurth Solar commercialised its CIS technology
in 2007 producing 15 MW. Nanosolar commercialised its CIGS technology in 2007 with
a production capacity of 430 MW for 2008 in the USA and Germany.[10]Honda, also
began to commercialize their CIGS base solar panel in 2008.In 2007, CdTe production
represented 4.7% of total market share, thin-film silicon 5.2% and CIGS 0.5%
THIRD GENERATION
Third generation technologies aim to enhance poor electrical performance of second
generation (thin-film technologies) while maintaining very low production costs
Current research is targeting conversion efficiencies of 30-60% while retaining
low cost materials and manufacturing techniques. They can exceed the theoretical solar
conversion efficiency limit for a single energy threshold material that was calculated in
1961 by Shockley and Queisser as 31% under 1 sun illumination and 40.8% under
maximal concentration of sunlight (46,200 suns, which makes the latter limit more
difficult to approach than the former).
There are a few approaches to achieving these high efficiencies including the use
of Multifunction photovoltaic cells, concentration of the incident spectrum, the use of
thermal generation by UV light to enhance voltage or carrier collection, or the use of the
infrared spectrum for night-time operation.
HOW DO PHOTOVOLTAICS WORK?
Photovoltaics are the direct conversion of light into electricity at the atomic level. Some
materials exhibit a property known as the photoelectric effect that causes them to absorb
photons of light and release electrons. When these free electrons are captured, an electric
current result that can be used as electricity.
The photoelectric effect was first noted by a French physicist, Edmund Bequerel,
in 1839, who found that certain materials would produce small amounts of electric
current when exposed to light. In 1905, Albert Einstein described the nature of light and
the photoelectric effect on which photovoltaic technology is based, for which he later
won a Nobel prize in physics. The first photovoltaic module was built by Bell
Laboratories in 1954. It was billed as a solar battery and was mostly just a curiosity as it
was too expensive to gain widespread use. In the 1960s, the space industry began to make
the first serious use of the technology to provide power aboard spacecraft. Through the
space programs, the technology advanced, its reliability was established, and the cost
began to decline. During the energy crisis in the 1970s, photovoltaic technology gained
recognition as a source of power for non-space applications.
The diagram above illustrates the operation of a basic photovoltaic cell, also
called a solar cell. Solar cells are made of the same kinds of semiconductor materials,
such as silicon, used in the microelectronics industry. For solar cells, a thin
semiconductor wafer is specially treated to form an electric field, positive on one side and
negative on the other. When light energy strikes the solar cell, electrons are knocked
loose from the atoms in the semiconductor material. If electrical conductors are attached
to the positive and negative sides, forming an electrical circuit, the electrons can be
captured in the form of an electric current -- that is, electricity. This electricity can then
be used to power a load, such as a light or a tool.
A number of solar cells electrically connected to each other and mounted in a
support structure or frame is called a photovoltaic module. Modules are designed to
supply electricity at a certain voltage, such as a common 12 volts system. The current
produced is directly dependent on how much light strikes the module
Multiple modules can be wired together to form an array. In general, the larger the area of
a module or array, the more electricity that will be produced. Photovoltaic modules and
arrays produce direct-current (dc) electricity. They can be connected in both series and
parallel electrical arrangements to produce any required voltage and current combination
Today's most common PV devices use a single junction, or interface, to create an
electric field within a semiconductor such as a PV cell. In a single-junction PV cell, only
photons whose energy is equal to or greater than the band gap of the cell material can free
an electron for an electric circuit. In other words, the photovoltaic response of single-
junction cells is limited to the portion of the sun's spectrum whose energy is above the
band gap of the absorbing material, and lower-energy photons are not used
One way to get around this limitation is to use two (or more) different cells, with
more than one band gap and more than one junction, to generate a voltage. These are
referred to as "multijunction" cells (also called "cascade" or "tandem" cells).
Multijunction devices can achieve a higher total conversion efficiency because they can
convert more of the energy spectrum of light to electricity
SOLAR COLLECTOR
solar collector is a device for extracting the energy of the sun directly into a more
usable or storable form. The energy in sunlight is in the form of electromagnetic radiation
from the infrared (long) to the ultraviolet (short) wavelengths. The solar energy striking
the earth's surface at any one time depends on weather conditions, as well as location and
orientation of the surface, but overall, it averages about 1000 watts per square meter
under clear skies with the surface directly perpendicular to the sun's rays
SOLAR COLLECTORS FOR ELECTRIC GENERATION
Parabolic troughs, dishes and towers described in this section are used almost
exclusively in solar power generating stations or for research purposes. The conversion
efficiency of a solar collector is expressed as eta0 or η0
PARABOLIC TROUGH
This type of collector is generally used in solar power plants. A trough-shaped
parabolic reflector is used to concentrate sunlight on an insulated tube (Dewar tube) or
heat pipe, placed at the focal point, containing coolant which transfers heat from the
collectors to the boilers in the power station
A parabolic trough is a type of solar thermal energy collector. It is constructed as
a long parabolic mirror (usually coated silver or polished aluminum) with a Dewar tube
running its length at the focal point. Sunlight is reflected by the mirror and concentrated
on the Dewar tube. The trough is usually aligned on a north-south axis, and rotated to
track the sun as it moves across the sky each day
Alternatively the trough can be aligned on an east-west axis, this reduces the overall
efficiency of the collector, due to cosine loss, but only requires the trough to be aligned
with the change in seasons, avoiding the need for tracking motors. This tracking method
works correctly at the spring and fall equinoxes with errors in the focusing of the light at
other times during the year (the magnitude of this error varies throughout the day, taking
a minimum value at solar noon). There is also an error introduced due to the daily motion
of the sun across the sky, this error also reaches a minimum at solar noon. Due to these
sources of error, seasonally adjusted parabolic troughs are generally designed with a
lower solar concentration ratio
Heat transfer fluid (usually oil) runs through the tube to absorb the concentrated
sunlight. The heat transfer fluid is then used to heat steam in a standard turbine generator.
The process is economical and, for heating the pipe, thermal efficiency ranges from 60-
80%. The overall efficiency from collector to grid, i.e. (Electrical Output Power)/(Total
Impinging Solar Power) is about 15%, similar to PV (Photovoltaic Cells) but less than
Stirling dish concentrators.
Current commercial plants utilizing parabolic troughs are hybrids; fossil fuels are used
during night hours, but the amount of fossil fuel used is limited to a maximum 27% of
electricity production, allowing the plant to qualify as a renewable energy source.
Because they are hybrids and include cooling stations, condensers, accumulators and
other things besides the actual solar collectors, the power generated per square meter of
space ranges enormously
PARABOLIC DISH
It is the most powerful type of collector which concentrates sunlight at a single,
focal point, via one or more parabolic dishes -- arranged in a similar fashion to a
reflecting telescope focuses starlight, or a dish antenna focuses radio waves. This
geometry may be used in solar furnaces and solar power plants
There are two key phenomenena to understand in order to comprehend the design
of a parabolic dish. One is that the shape of a parabola is defined such that incoming rays
which are parallel to the dish's axis will be reflected toward the focus, no matter where on
the dish they arrive. The second key is that the light rays from the sun arriving at the
earth's surface are almost completely parallel. So if dish can be aligned with its axis
pointing at the sun, almost all of the incoming radiation will be reflected towards the
focal point of the dish -- most losses are due to imperfections in the parabolic shape and
imperfect reflection
Losses due to atmosphere between the dish and its focal point are minimal, as the
dish is generally designed specifically to be small enough that this factor is insignificant
on a clear, sunny day. Compare this though with some other designs, and you will see
that this could be an important factor, and if the local weather is hazy, or foggy, it may
reduce the efficiency of a parabolic dish significantly
In some power plant designs, a stirling engine coupled to a dynamo, is placed at
the focus of the dish, which absorbs the heat of the incident solar radiation, and converts
it into electricity
POWER TOWER
A power tower is a large tower surrounded by small rotating (tracking) mirrors
called heliostats. These mirrors align themselves and focus sunlight on the receiver at the
top of tower, collected heat is transferred to a power station below
SOLAR PYRAMIDS
Another design is a pyramid shaped structure, which works by drawing in air,
heating it with solar energy and moving it through turbines to generate electricity. Solar
pyramids have been built in places like Australia.
ADVANTAGES
Very high temperatures reached. High temperatures are suitable for electricity
generation using conventional methods like steam turbine or some direct high
temperature chemical reaction.
Good efficiency. By concentrating sunlight current systems can get better
efficiency than simple solar cells.
A larger area can be covered by using relatively inexpensive mirrors rather than
using expensive solar cells.
Concentrated light can be redirected to a suitable location via optical fiber cable.
For example illuminating buildings, like here
DISADVANTAGES
Concentrating systems require sun tracking to maintain Sunlight focus at the
collector. Inability to provide power in diffused light conditions. Solar Cells are able to
provide some output even if the sky becomes a little bit cloudy, but power output from
concentrating systems drop drastically in cloudy conditions as diffused light cannot be
concentrated passively
The following process will give you
ADVANTAGES
Solar energy is free - it needs no fuel and produces no waste or pollution
In sunny countries, solar power can be used where there is no easy way to get
electricity to a remote place. Handy for low-power uses such as solar powered garden
lights and battery chargers, or for helping your home energy bills.
DISADVANTAGES
Doesn't work at night
Very expensive to build solar power stations.
Solar cells cost a great deal compared to the amount of electricity they'll produce
in their lifetime.
Can be unreliable unless you're in a very sunny climate. In the United Kingdom,
solar power isn't much use for high-power applications, as you need a large area of solar
panels to get a decent amount of power. However, technology has now reached the point
where it can make a big difference to your home fuel bills
Our planet receives enough raw energy in the form of sunlight in sixty minutes to illuminate all of the worlds lights for a full year. Unfortunately, a very small part of it can be harnessed so most of the population still gets most of its energy from power plants that burn fossil fuels. Fortunately for our environment, we have recently seen an increasing trend in the demand for solar energy. This is partly due to the fact that solar panels are becoming cheaper as technology advances.
At the equator, the Sun provides approximately 1000 watts of energy per square meter on the earths surface. That means that 1 square meter of each panel can generate approximately 100 GW of raw power per year. That amount of power is enough to illuminate more than 50,000 houses. The entire area that would need to be covered by solar panels to power the entire world for a year would be the equivalent to one percent of the entire space of the Sahara Desert. The amount of power solar panels can generate on a given day depends on a few variables like smog, cloudy days, low temperatures and humidity.
Solar panel farms are a lot like other normal power plants with the only big difference being that most power plants get their energy from fossil fuels. And when conventional plants burn fossil fuels, they generate the by products which are contributing to global warming. Solar panel farms or solar heat plants (or CSP plants) absorb the rays of the sun to generate electrical energy.
This process of energy conversion in solar heat plants rather simple. The panels absorb the rays of the sun, which then shines on the power receiver. In this receiver, the energy is converted into steam from the suns rays. The steam is taken to tanks where it will be used to spin turbines and generate electricity. The process is clean because it requires no fossil fuels to be burned. It is safe for the environment and doesn't contribute to global warming like conventional power plants.
If more solar panel farms are implemented, the demand for oil will be reduced sharply. Today, there are many households that use solar panels for energy and more people are adding panels every day. When this demand for solar energy and other alternatives goes up, fewer people will use gas and fossil fuels, and the prices for these will surely drop as well.
If you use solar energy, you may actually be able to use "negative energy". Because every house is connected to the city's power system, the extra energy that your panels produce will go back into the grid and can be consumed by other households. This will result in you being sent a check by the electric company for the energy you put back in. Even if you panels are small, you will see a huge reduction in your bill. These solar panels, aside from being good for the environment, are good for your pocket!
Even though the initial investment into your solar panel system is a bit expensive, the panels will undoubtedly pay for themselves in the long run. Not only do you save money and perhaps even make some with your panels, you help the environment by reducing greenhouse gases and emissions. These systems are so durable they have been known to last years. PV cells are supposed to stay good anywhere from twenty-five to forty years. Most suppliers of solar panels have a standard twenty-five year warranty.
Finally, solar panels take minimal maintenance and they can be placed basically anywhere that gets a good amount of sunlight all year.
There is no question that alternative energy IS the future and the future is right now.
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