renewable energy resources an overview part ieebag/overview of renewable resources- part...
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Renewable Energy
Resources – an Overview
Part I
Y. Baghzouz
Professor of Electrical Engineering
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World Electricity Generation by
Source (2015)
Source: US Energy Information Administration (EIA)
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US Sources of Electricity Generation, 2017
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Source: https://www.eia.gov/tools/faqs/faq.php?id=427&t=3
US Sources of
Electricity Generation,
2018
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Efficiency of Heat Engines
Note that nearly 80% of the US electricity is
generated in power plants that convert heat
into mechanical power.
A heat engine extracts heat qH from a high-
temperature source, converts part of it into
work w, and rejects the remaining heat qL into
a low-temperature sink.
Thermal efficiency
Maximum possible efficiency
(where T is in oK)
The average thermal efficiency of a thermal
power plant is around 30%, while the
maximum possible (Carnot) efficiency is
nearly double this amount.
HH
LH
q
w
q
H
LH
T
TT
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Source: NREL
100% by 2045
50% by 2030
15% by 2025
50% by 2023
States with RPS
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Primary Resource on Photovoltaics
https://www.energy.gov/articles/energy-101-
solar-photovoltaics
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Growth in Solar Photovoltaics
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World’s Largest PV Plants
https://en.wikipedia.org/wiki/List_of_photovolt
aic_power_stations
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Trend of PV cell efficiencies
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Trend of bulk PV price/watt (peak)
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Renewable Resources
GEO-
THERMAL
HYDRO
Earth Derived
Energy
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Linear CSP Systems
Linear CSP collectors capture the sun’s energy with large mirrors
that reflect and focus the sunlight onto a linear receiver tube.
The receiver contains a fluid that is heated by the sunlight and
then used to create steam that spins a turbine driving a generator
to produce electricity.
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Linear CSP in Nevada: NV Solar I (65 MW)
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Power Tower CSP Systems
Sun-tracking mirrors (heliostats) focus sunlight onto a receiver at the
top of a tower. A heat-transfer fluid heated in the receiver is used to
generate steam, which in turn is used by turbine generator to
produce electricity.
Some power towers use water/steam as the heat transfer fluid.
Other advanced designs are experimenting with molten nitrate salt
because of its superior heat-transfer capabilities.
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Power Tower CSP in Nevada:
Tonopah – 110 MW
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World’s largest - Ivanpah Solar: 350 MW
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Dish/Engine CSP Systems
A sun-tracking solar concentrator, reflects the beams sunlight
onto a thermal receiver that collects the solar heat.
The PCU includes the thermal receiver and the
engine/generator. A thermal receiver can be a bank of tubes
with a cooling fluid— usually hydrogen —that typically is the
heat transfer medium and also the working fluid for an
engine.
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Dish CSP
Currently, the most common type of heat engine used in
dish/engine systems is the Sterling engine where the
heated gas moves pistons and create mechanical power.
Grid connection is through an induction machine.
Heat engine concept
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Dish-Engine CSP Testing @ UNLV