Lecture 2

“Introduction to Renewable energy sources”
Rahmatillayev Shahzod
Department of ”Alternativ energy sources”
Tashkent state technical university

Renewable Energy and
Non-renewable Energy
Energy Sources
• Non-renewable: A non-renewable resource is a limited natural resource that

cannot be re-made or re-grown in a short amount of time at a scale
comparable to its consumption.
• Renewable: Renewable resources are unlimited natural resources that can be

replenished in a short period of time.
Renewable Energy Sources
• Renewable energy is energy generated from natural resources—

such as sunlight, wind, rain, tides and geothermal heat—which are
renewable (naturally replenished).
• Solar energy
• Wind
• Hydropower
• Biomass
• Ocean energy
• Geothermal
• Waste to Energy
Solar Energy
What Is Solar Power?
• Solar power is one of the best renewable energy sources available because it is one
the cleanest sources of energy.
• Solar power is the conversion of sunlight into electricity either directly by using
photovoltaics or concentrated solar power.
Solar Electricity Generation
Different Types of Solar Collectors
Compound Parabolic Concentrator Flat-plate Collector
Parabolic through Concentrator Evacuated-tube Collector

Cumulative Solar Electricity Capacity (2015)
Wind Energy
Why Wind Energy?
 Clean, zero emissions

 NOx, SO2, CO, CO2
 Air quality, water quality
 Climate change
 Reduce fossil fuel dependence

 Energy independence
 Domestic energy—national security
 Renewable
 No fuel-price volatility
Cumulative Wind Electricity Capacity (2015)
Modern Wind Turbines
Pros
Pros Cons
• Omni-directional • Rotors generally near ground where
• Accepts wind from any direction wind is poorer.
• Components can be mounted at ground • Centrifugal force stresses blades.
level • Poor self-starting capabilities.
• Ease of service
• Requires support at top of turbine rotor.
• Lighter weight towers
• Requires entire rotor to be removed to
• Can theoretically use less materials to replace bearings.
capture the same amount of wind.
• Overall poor performance and reliability.
12
Geothermal Energy
Geothermal Energy
• Geothermal heat is the only renewable energy source created naturally by the
Earth itself.
• Approximately 6400 km below the Earth’s surface is the core, where temperatures
can reach 5000°C.
• These reservoirs can be tapped for a variety of uses, such as to generate electricity
or to heat buildings.
• The geothermal energy potential in the 10 km of the Earth’s crust amounts to
50,000 times the energy of all oil and gas resources in the world.
Cumulative Geothermal Electricity Capacity (2015)
Geothermal Power Plant Technologies
Geothermal Heat Pump Operating In Summer and
Winter Modes
Geothermal Heat Pump
Hydropower
• Hydropower or water power is power derived from the energy of falling water or
fast running water, which may be harnessed for useful purposes.
• Flowing water creates energy that can be captured and turned into electricity.
This is called hydroelectric power or hydropower.
• The most common type of hydroelectric power plant uses a dam on a river to
store water in a reservoir.
Hydropower Plants
Impoundments
Diversion
Pumped Storage Hydropower Plant
• When demand for electricity is low, a pumped storage facility stores energy by
pumping water from a lower reservoir to an upper reservoir.
• During periods of high electrical demand, the water is released back to the lower
reservoir to generate electricity.
Marine and Hydrokinetic Power
Dr. Shiva Gorjian, Tarbiat Modares

26
Universtiy
Marine and Hydrokinetic Energy
• Marine and hydrokinetic energy systems, a new generation of water power

technologies offers the possibility of generating electricity from water without the
need for dams and diversions.
• The ocean can produce two types of energy:

o Thermal energy from the sun’s heat.
o Mechanical energy from the tides and waves.
• The three most well-known generating technologies for deriving electrical power
from the ocean are:
 Tidal power
 Wave power
 Ocean thermal energy conversion (OTEC).
Tidal Energy Technologies
Tidal Fences
Tidal Barrages
Tidal Turbines
Ocean Thermal Energy Conversion
Wave Energy
Point Absorber
Terminator
Biopower
Biomass
• One of the promising sources of renewable energy is biomass.

• Biomass is the feedstock used to produce bioenergy.
• Bioenergy is a general term for energy derived from materials such as straw,
wood, or animal wastes.
• Such materials can be burned directly to produce heat or power, and also can be
converted into liquid biofuels.
Types of Biomass
“On average, biomass is made of 75%
carbohydrates and 25% lignin”.
Biomass Direct Combustion
• There are two main components of a combustion–based biomass plant:

o Biomass-fired boiler.
o Steam turbine.
Anaerobic Digestion
Biodiesel and Bioethanol Production
• Biodiesel refers to a vegetable oil or animal fat-

based diesel fuel which is typically made by
chemically reacting lipids (vegetable oil, soybean
oil, animal fat) with an alcohol producing fatty
acid esters.
• Bioethanol is an alcohol made by fermentation,

mostly from carbohydrates produced
in sugar or starch crops.
• Cellulosic biomass, derived from non-food

sources, such as trees and grasses, is also being
developed as a feedstock for ethanol production.
Global Ethanol Production
Top Five Regions (2015) Ethanol Production (millions of gallons)

Global Biodiesel Production
Top Countries (2015) Biodiesel Production (millions of gallons/year)

Top Countries for Renewable Electricity Installed
Capacity (2015)
Top Countries with Installed Renewable Electricity by
Technology (2015)
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“Introduction to Renewable energy sources”

Department of ”Alternativ energy sources”

Tashkent state technical university

• Non-renewable: A non-renewable resource is a limited natural resource that

• Renewable: Renewable resources are unlimited natural resources that can be

• Renewable energy is energy generated from natural resources—

Compound Parabolic Concentrator Flat-plate Collector

Parabolic through Concentrator Evacuated-tube Collector

 Clean, zero emissions

 Reduce fossil fuel dependence

Dr. Shiva Gorjian, Tarbiat Modares

• Marine and hydrokinetic energy systems, a new generation of water power

• The ocean can produce two types of energy:

• One of the promising sources of renewable energy is biomass.

• There are two main components of a combustion–based biomass plant:

• Biodiesel refers to a vegetable oil or animal fat-

• Bioethanol is an alcohol made by fermentation,

• Cellulosic biomass, derived from non-food

Top Five Regions (2015) Ethanol Production (millions of gallons)

Top Countries (2015) Biodiesel Production (millions of gallons/year)

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