Summary of "Lecture - 5 Non Conventional Energy Sources"

Summary of Non-Conventional Energy Sources

The lecture discusses various non-conventional energy sources, focusing on their principles, applications, and efficiencies compared to conventional sources. The key topics covered include:

Magneto Hydrodynamic (MHD) Generation:
- MHD is a method of generating electric power using ionized gases in a strong magnetic field.
- The process involves:
  - Combustion of fuel (coal, oil, or natural gas) to produce hot gases at around 2500°C.
  - These gases pass through a magnetic field, generating electricity directly.
- Advantages include higher efficiency (up to 50%) compared to conventional thermal power plants (typically around 30-40%).
- Challenges include economic feasibility, with limited practical implementations worldwide.
Gas Turbines:
- Involves the combustion of fuel to produce hot gases that drive a turbine connected to a generator.
- Efficiency is lower (around 30%) compared to thermal power plants.
- Gas Turbines are preferred for their quick start-up capabilities, making them suitable for meeting peak loads.
Geothermal Power Plants:
- Utilizes heat from the Earth to generate power.
- The process involves pumping water into the ground, where it is heated and turned into steam, which then drives a turbine.
- Examples include geothermal power stations in India (e.g., Ladakh).
- Geothermal Energy is significant in countries like New Zealand, where it contributes to 8% of power generation.
Wind Power:
- One of the oldest energy sources, reliant on the kinetic energy of wind to generate electricity.
- Wind Energy is clean and non-polluting, with no greenhouse gas emissions.
- Challenges include variability and dependence on wind speed.
- Wind turbines can be classified into horizontal and vertical axis types, with most being horizontal.
- India has significant potential for Wind Energy, particularly in states like Tamil Nadu and Gujarat.
Renewable Energy Sources:
- Emphasizes the importance of renewable energy for sustainable development.
- Renewable energy is becoming more economically viable as technology advances and costs decrease.
- Highlights the need for sustainable practices to protect the environment.

Key Concepts and Methodologies

MHD Generation:
- Combustion of fuel → Hot gases → Ionization → Magnetic field → Electricity generation.
Gas Turbines:
- Compressed air + fuel combustion → Hot gases → Turbine → Electricity generation.
Geothermal Energy:
- Water pumped underground → Heated → Steam → Turbine → Electricity generation.
Wind Energy:
- Wind kinetic energy → Turbine → Electricity generation.

Featured Researchers/Sources

Former Soviet Union (USSR) for MHD technology.
BHEL (Bharat Heavy Electricals Limited) for MHD power plant in India.
Various countries for geothermal and Wind Energy research (e.g., New Zealand, Japan, Italy).
IIT Delhi's Center for Energy Studies for Wind Energy projects and research.