6..solar energy storage
TRANSCRIPT
-
8/2/2019 6..Solar Energy Storage
1/28
Non Conventional Sources
Solar Energy Storages
-
8/2/2019 6..Solar Energy Storage
2/28
outline Difference between conventional and non-conventional energy How much solar energy received by earth ? What are Solar technologies?
Technical definition of Solar Energy? Thermal energy storage Different types of solar energy storages
->thermal energy storage-latent-sensible heat.. Water storage..pebble heat storage
->electrical storage-capacitor-inductor-battery storage
->chemical storage-chemical-thermo chemical storage->mechanical energy storage-pumping hydro electric-
compressed air-fly wheel.
-
8/2/2019 6..Solar Energy Storage
3/28
Conventional Sources (Renewable)
These are the commonly and widely used sourceseg. Hydroelectricity, Thermal Power (from coal,mineral oil, natural gas)
Non Conventional Sources(NonRenewable)
These are the new sources of energy, which are
still not in common use. Their contribution to thenational power is nominal.Eg. Solar, Tidal, Wind, Bio gas, Geo thermal.
-
8/2/2019 6..Solar Energy Storage
4/28
What is Solar Energy? Originates with the
thermonuclear fusionreactions occurring inthe sun.
Represents the entireelectromagneticradiation (visible light,
infrared, ultraviolet, x-rays, and radio waves).
-
8/2/2019 6..Solar Energy Storage
5/28
How much solar energy?
The surface receives about 47% of the total solar energy that reaches
the Earth. Only this amount is usable.
-
8/2/2019 6..Solar Energy Storage
6/28
Solar technologies are broadly characterized as either passive solar oractive solar depending on the way they capture, convert and distributesunlight
Active solar techniques include the use of photovoltaic panels, solarthermal collectors, with electrical or mechanical equipment, to convertsunlight into useful outputs.
Passive solar techniques include orienting a building to the Sun,
selecting materials with favorable thermal mass or light dispersingproperties, and designing spaces that naturally circulate air.
http://en.wikipedia.org/wiki/Passive_solarhttp://en.wikipedia.org/wiki/Active_solarhttp://en.wikipedia.org/wiki/Solar_thermal_energyhttp://en.wikipedia.org/wiki/Solar_thermal_energyhttp://en.wikipedia.org/wiki/Thermal_masshttp://en.wikipedia.org/wiki/Ventilation_%28architecture%29http://en.wikipedia.org/wiki/Ventilation_%28architecture%29http://en.wikipedia.org/wiki/Thermal_masshttp://en.wikipedia.org/wiki/Solar_thermal_energyhttp://en.wikipedia.org/wiki/Solar_thermal_energyhttp://en.wikipedia.org/wiki/Active_solarhttp://en.wikipedia.org/wiki/Passive_solar -
8/2/2019 6..Solar Energy Storage
7/28
Solar Energy: The energy transmitted from the Sun. The
upper atmosphere of Earth receives about 1.5
1021 watt-hours (thermal) of solarradiation annually. This vast amount ofenergy is more than 23,000 times that usedby the human population of this planet, but it
is only about one two-billionth of the Sun'smassive outpouringabout 3.9 102MW
-
8/2/2019 6..Solar Energy Storage
8/28
-
8/2/2019 6..Solar Energy Storage
9/28
-
8/2/2019 6..Solar Energy Storage
10/28
-
8/2/2019 6..Solar Energy Storage
11/28
-
8/2/2019 6..Solar Energy Storage
12/28
There are four primary ways tostore solar thermal energy:
(1) sensible-heat-storage systems, which store thermalenergy in materials with good heat-retentionqualities;
(2) latent-heat-storage systems, which store solarthermal energy in the latent heat of fusion orvaporization of certain materials undergoing achange of phase;
(3) chemical energy storage, which uses reversiblereactions (for example, the dissociation-association
reaction ofsulfuric acid and water); and(4) electrical or mechanical storage, particularly through
the use of storage batteries (electrical) orcompressed air (mechanical)Energy storage.
http://www.answers.com/topic/heat-of-fusionhttp://www.answers.com/topic/heat-of-fusionhttp://www.answers.com/topic/sulfuric-acidhttp://www.answers.com/topic/sulfuric-acidhttp://www.answers.com/topic/energy-storagehttp://www.answers.com/topic/energy-storagehttp://www.answers.com/topic/energy-storagehttp://www.answers.com/topic/sulfuric-acidhttp://www.answers.com/topic/heat-of-fusion -
8/2/2019 6..Solar Energy Storage
13/28
sensible heat storagea heat storage system that operates on the basis of a changein the temperature (but not the state) of the storage medium
(e.g., water).
-
8/2/2019 6..Solar Energy Storage
14/28
Sensible heat storage with air as the energy transport
mechanism, rock, gravel, or crushed stone in a bin has the
advantage of providing a large, cheap heat transfer
surface.
1.Rock is more easily contained than water.
2.Rock acts as its own heat exchanger
3.It can be used for thermal storage at high temperatures,
much higher than 100*c
4.the heat transfer coefficients between the air and solidis high.
5.The cost of storage material is low.
6.The conductivity of the bed is low when air flow is not
present.
Pebble bed exchanger have good heat
transfer characteristics between air and the solids of the
bed. This type of storage system has been used in the
solar houses or with hot air collector system.
-
8/2/2019 6..Solar Energy Storage
15/28
-
8/2/2019 6..Solar Energy Storage
16/28
Latent heat is the energy absorbed or released when
a substance changes its physical state.
Latent heat is absorbed upon evaporation, and
released upon condensation to liquid (as in clouds).
Latent heat is also absorbed when water melts, andreleased when it freezes.
-
8/2/2019 6..Solar Energy Storage
17/28
-
8/2/2019 6..Solar Energy Storage
18/28
B Co-Generator UnitProvides heat (and electricity) when passive solar
heat or photovoltaic (PV) generated electricity is
insufficient.
L BatteriesSufficient electrical energy storage for 4 days
without sunshine.
K Solar Photovoltaic PanelsProvides approx. 80% of electrical requirements.
-
8/2/2019 6..Solar Energy Storage
19/28
CHEMICAL ENERGY STORAGE:
-
8/2/2019 6..Solar Energy Storage
20/28
Certain organ metallic molecules undergo a reaction upon exposure to lightthat is reversible with either a catalyst or heat. In some cases a considerableamount of energy can be stored, as was shown for example in the work ofVollhardt in 1996 for fulvalenes. In the Ru case shown in this figure, the Ru-Ru bond and the C-C bond are broken upon light exposure, and the moleculeeffectively flips. This stored chemical energy is highly stable, with a largeback-reaction barrier, and can then be released in a very straightforwardmanner. To understand how and why this reaction takes place, and also howthe efficiency of the reaction in order to increase its ability to store energy. Anumber of other such molecules that fall into the same class of sunlight-to-chemical energy storage. Were also exploring pathways for utilizing suchmolecules on large scales, which involve appropriate matrix materials (whichin turn impact its chemical properties).
-
8/2/2019 6..Solar Energy Storage
21/28
-
8/2/2019 6..Solar Energy Storage
22/28
To pump water from one reservoir to another
reservoir at a higher level. During periods of peak
electrical demand, water from the higher reservoiris released through turbines to the lower reservoir
and electricity is produced. These systems use
more electricity to pump than they can produce.
Typical power rating on these systems is between
100
2000 MW with a typical energy ratingbetween 4 10 hours.
-
8/2/2019 6..Solar Energy Storage
23/28
-
8/2/2019 6..Solar Energy Storage
24/28
In compressed air energy storage, is used to pumpair (1) to a high pressure (2) into a sealedunderground cavern. (3) as the air in the cavern is
slowly heated and released; the resulting powerproduced by the generator (4) may be used atpeak hours.
Typical power rating on these systems is between100 300 MW with a typical energy rating between6 20 hours
-
8/2/2019 6..Solar Energy Storage
25/28
-
8/2/2019 6..Solar Energy Storage
26/28
1. A flywheel is an electromechanical
device that couples a motor generatorwith a rotating mass to store energy forshort durations
2. flywheels constructed from carbon fibermaterials and magnetic bearings canspin in vacuum at speeds up to 40,000
to 60,000 RPM.
-
8/2/2019 6..Solar Energy Storage
27/28
CONCLUSION:
Solar energy is a clean, pollution free and renewable source of energy. To make sure we have plenty of energy in the future, it's up to all of us
to use energy wisely. We must all conserve energy and use itefficiently. It's also up to those who will create the new energytechnologies of the future.
All energy sources have an impact on the environment. Concernsabout the greenhouse effect and global warming, air pollution, andenergy security have led to increasing interest and more developmentin renewable energy sources such as solar, wind, geothermal, wavepower and hydrogen.
But we'll need to continue to use fossil fuels and nuclear energy until
new, cleaner technologies can replace them. One of you who is readingthis might be another The future is ours, but we need energy to get there.
-
8/2/2019 6..Solar Energy Storage
28/28
Imagination is more important than knowledge, for
knowledge is limited, whereas imagination embraces theentire world - stimulating progress, giving birth to evolution.
- Albert Einstein
Quotes: