Energy Technology S Rao Parulekar Zipl
Eduviges Gearlds
Energy Technology S Rao Parulekar Zipl: A Comprehensive and Topical Textbook
Energy is one of the most important resources for human civilization and development. Energy technology is the study of various sources and methods of energy conversion, utilization, and conservation. Energy technology can be classified into two broad categories: conventional and nonconventional.
Conventional Energy Technology
Conventional energy technology refers to the use of fossil fuels (coal, oil, natural gas), hydro power, and nuclear power to generate electricity and heat. These sources are widely used because they are abundant, reliable, and relatively cheap. However, they also have some drawbacks, such as environmental pollution, greenhouse gas emissions, resource depletion, and safety risks.
Coal
Coal is a solid fuel that is formed from the remains of plants and animals that lived millions of years ago. Coal is mined from underground or surface mines and then burned in power plants to produce steam that drives turbines and generators. Coal is the most abundant fossil fuel in the world and accounts for about 40% of global electricity production. Coal has a high energy density and can be easily transported and stored. However, coal also produces a lot of air pollutants, such as sulfur dioxide, nitrogen oxides, particulate matter, mercury, and carbon dioxide. Coal combustion also contributes to acid rain, smog, and global warming.
Oil
Oil is a liquid fuel that is extracted from underground reservoirs or wells. Oil is refined into various products, such as gasoline, diesel, kerosene, jet fuel, heating oil, and asphalt. Oil is mainly used for transportation and heating purposes. Oil accounts for about 33% of global primary energy consumption. Oil has a high energy density and can be easily transported by pipelines, tankers, trucks, and trains. However, oil also causes environmental problems, such as oil spills, air pollution, greenhouse gas emissions, and resource depletion. Oil is also subject to price fluctuations and geopolitical conflicts.
Natural Gas
Natural gas is a gaseous fuel that consists mainly of methane. Natural gas is found in underground reservoirs or wells, often associated with oil or coal deposits. Natural gas can be used for electricity generation, heating, cooking, industrial processes, and transportation. Natural gas accounts for about 24% of global primary energy consumption. Natural gas has a high energy efficiency and produces less air pollutants and greenhouse gas emissions than coal or oil. However, natural gas also has some disadvantages, such as leakage, flammability, explosion risk, and dependence on pipelines for transportation.
Hydro Power
Hydro power is the use of flowing water to spin turbines and generators that produce electricity. Hydro power can be generated from rivers, dams, reservoirs, lakes, or oceans. Hydro power accounts for about 16% of global electricity production. Hydro power is a renewable and clean source of energy that does not produce any air pollutants or greenhouse gas emissions. However, hydro power also has some negative impacts on the environment and society, such as water diversion, habitat loss, fish migration disruption,
Nuclear Power
Nuclear power is the use of nuclear fission to generate electricity and heat. Nuclear power plants use uranium-235, a rare isotope of uranium, as fuel. Uranium-235 can undergo fission when hit by a neutron, releasing energy and more neutrons that can trigger a chain reaction. Nuclear power plants control the chain reaction by using moderators and control rods to slow down and absorb the neutrons. Nuclear power accounts for about 10% of global electricity production. Nuclear power is a low-carbon source of energy that does not produce any air pollutants or greenhouse gas emissions during operation. However, nuclear power also poses some challenges, such as radioactive waste management, nuclear safety, security, and proliferation risks, and high capital and decommissioning costs.
Nonconventional Energy Technology
Nonconventional energy technology refers to the use of renewable and alternative sources of energy that are not widely used or well established. Renewable energy sources are those that can be replenished naturally in a short period of time, such as solar, wind, geothermal, biomass, and ocean energy. Alternative energy sources are those that are not based on fossil fuels or nuclear fission, such as hydrogen, fuel cells, and nuclear fusion. Nonconventional energy sources have the potential to provide clean, sustainable, and diversified energy for the future. However, they also face some barriers, such as intermittency, variability, low energy density, high cost, and technological maturity.
Solar Energy
Solar energy is the radiant energy from the sun that reaches the earth. Solar energy can be harnessed for electricity generation and heating purposes using various technologies. Solar thermal energy conversion systems use mirrors or lenses to concentrate sunlight and heat a fluid that drives a turbine or engine. Solar thermal power plants can produce electricity on a large scale and store heat for later use. Solar photovoltaic systems use semiconductor materials to convert sunlight directly into electricity. Solar photovoltaic panels can be installed on rooftops or ground-mounted arrays to provide distributed or centralized power. Solar energy accounts for about 3% of global electricity production. Solar energy is a renewable and clean source of energy that does not produce any air pollutants or greenhouse gas emissions during operation. However, solar energy also has some limitations, such as dependence on weather and daylight conditions, high land and water requirements, and environmental impacts of manufacturing and disposal of solar equipment.
Wind Energy
Wind energy is the kinetic energy of the air movement in the earth's atmosphere. Wind energy can be harnessed for electricity generation and mechanical power using various technologies. Wind turbines are devices that convert wind energy into electricity by rotating blades that drive a generator. Wind turbines can be installed on land (onshore) or in the sea (offshore) and can range in size from a few kilowatts to several megawatts. Wind farms are clusters of wind turbines that are connected to the electrical grid or to local loads. Wind energy accounts for about 6% of global electricity production. Wind energy is a renewable and clean source of energy that does not produce any air pollutants or greenhouse gas emissions during operation. However, wind energy also has some challenges, such as variability, intermittency, low energy density, high land and visual impact, and environmental and social effects on wildlife and communities.
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