Energy sources

Page 1: Overview of Energy Sources

• Definition of Energy: Energy is defined as the capacity to do work, derived from Greek words meaning 'in work'.

• Usage of Energy:

  • Transform food into energy for bodily functions.

  • Utilized by vehicles (cars, planes) and machinery to perform work (movement, lifting, heating).

• Measurement: Energy is measured in BTUs (British Thermal Units) or Joules.

Types of Energy

• Kinetic Energy: The energy of motion.

• Potential Energy: Energy stored due to position.

Forms of Energy in Environment

• Solar energy, wind energy, chemical energy, electrical energy, mechanical energy, nuclear energy, thermal energy, bio-energy, etc.

• All forms of energy can be categorized as kinetic or potential.

Global Energy Consumption Patterns

• Distribution of Energy Use:

  • 24% for transportation.

  • 40% for industry.

  • 30% for domestic/commercial uses.

  • 6% for agriculture and other uses.

• Rich Countries Consumption:

  • Top 20 countries consume 80% of natural gas, 65% of oil, and 50% of coal.

  • USA is the largest consumer.

• Energy Access:

  • 2 billion people lack adequate energy supplies, relying on wood, dung, and kerosene.

Energy Status of India

• Consumption Ranking: India is the sixth largest in energy consumption.

• Coal and Oil Use:

  • Consumes 100 million tons of coal, 325 million tons of oil annually.

  • Coal reserves and projected demands challenge energy status.

• Hydroelectric Power Needs: Projected demand for hydroelectricity significantly exceeds current capacity.

Page 2: Sources of Energy

Classification

• Primary Sources: Obtained directly from the environment.

  • Examples: Fossil fuels, nuclear fuels, hydro energy, geothermal, solar, wind, tidal.

• Renewable Energy Sources: Replenish after use (e.g., solar, wind).

• Non-renewable Sources: Finite and take longer to replenish (e.g., coal, oil, nuclear).

Page 3: Conventional vs. Non-Conventional Energy Sources

Comparison Table

1. Technological Maturity:

   • Conventional: Well-established.

   • Non-conventional: Less established.

2. Size of Energy Plants:

   • Conventional: Larger.

   • Non-conventional: Smaller.

3. Energy Density:

   • Conventional: High density.

   • Non-conventional: Low density.

4. Pollution:

   • Conventional: More pollution.

   • Non-conventional: Less pollution.

5. Storage:

   • Conventional: Easy.

   • Non-conventional: Uneconomical.

6. Cost:

   • Conventional: Lower.

   • Non-conventional: Higher.

Fossil Fuels

• Formed from ancient organic matter, consisting of hydrocarbons.

• Usage: Powering transportation, industry, and electricity generation.

• Environmental Effects:

  • Acid Rain: Caused by oxides of sulfur and nitrogen.

  • Fly Ash: Contributes to soil and water pollution.

  • Global Warming: CO2 emissions increase atmospheric greenhouse gases.

  • Air Pollution: Particulate matter from burning coal.

Page 4: Renewable Energy Sources

Solar Energy

• Originates from thermonuclear reactions in the sun, providing heat and light.

• Photovoltaic systems provide reliable energy, though cost is high.

Advantages of Solar Energy

1. Free and abundant.

2. Pollution-free.

3. Easy installation and maintenance.

4. Customizable systems.

5. Instant hot water supply.

6. Zero recurring fuel costs.

Disadvantages of Solar Energy

1. Variability with weather.

2. Requires large area for power stations.

Page 5: Alternatives to Fossil Fuels

Bio-energy and Nuclear Energy

Bio-energy

• Derived from organic matter, widely used in developing regions for household energy needs.

• Categories of Biomass: Solid biomass, biogas, and liquid biofuels.

Solid Biomass

• Includes crop residues and waste for direct combustion.

• Benefits:

  • Renewable and recyclable.

  • Reduces landfill waste.

  • Supports rural development.

Biogas

• Produced from anaerobic digestion of organic materials.

• Useful for cooking in rural areas with cattle.

Liquid Biofuels

• Examples include ethanol and biodiesel, used for transportation.

Page 6: Details on Alternative Fuels

Ethanol

• Fuel derived from plant sugars, often blended with gasoline to reduce pollution.

• Advantages: Cleaner burning, biodegradable, renewable.

Biodiesel

• Made from vegetable oils and fats, reduces emissions compared to petroleum diesel.

• Advantages:

  • Renewable and less polluting.

  • Compatible with existing engines.

Fuel Cells

• Convert chemical energy to electricity via reaction with oxygen.

• Structure: Two electrodes divided by an electrolyte, often using hydrogen.

• Advantages: No greenhouse gases, high efficiency, quiet operation.

Page 7: Nuclear Energy

• Obtained through fission or fusion processes of radioactive materials.

• Energy Production: A small amount of fuel yields substantial energy, significant compared to fossil fuels.

• Advantages: Less space required, reliable operation.

• Disadvantages: High initial cost, radioactive waste issues.

Page 9: Environmental Impact Assessment (EIA)

• Purpose: Identify and predict environmental impacts of projects.

• Preparation: Conducted by government or project supporters with possible consultant help.

Goals of EIA

• Resource conservation, waste minimization, efficient equipment use, and recycling.

Benefits

• Integrates environment and development decisions, reduces project costs, and increases public acceptance.

Page 10: EIA Process Steps

1. Screening: Determine if a project requires an EIA.

2. Scoping: Identify significant issues and prepare terms of reference.

3. Impact Analysis: Predict environmental and social effects.

4. Mitigation Management: Establish measures to compensate for impacts.

5. Reporting: Prepare informative decision-making documents.

6. Review: Check quality and compliance of EIA report.

7. Decision Making: Approve or reject proposals.

8. Follow Up: Monitor impacts post-implementation.

9. Public Involvement: Engage communities and stakeholders.