Non-conventional Energy Sources by G.D. Rai: A Review
Non-conventional energy sources are those that are renewable and environmentally friendly, such as solar, wind, biomass, geothermal, tidal, and hydrogen. These sources of energy have become increasingly important in the face of the depletion of fossil
fuels and the threat of climate change. One of the books that covers this topic in depth is Non-conventional Energy Sources by G.D. Rai, a professor of mechanical engineering at Banaras Hindu University.

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The book, which has been published in several editions since 1984, provides a comprehensive overview of the various non-conventional energy sources, their principles, applications, advantages, and limitations. The book also discusses the economics,
environmental impacts, and policies related to non-conventional energy sources. The book is divided into 14 chapters, each focusing on a different source of energy. The chapters are as follows:


Introduction
Solar Radiation
Solar Thermal Energy Conversion Systems
Solar Photovoltaic Systems
Wind Energy
Bioenergy
Geothermal Energy
Ocean Thermal Energy Conversion
Tidal Energy
Wave Energy
Hydrogen Energy
Fuel Cells
Magnetohydrodynamic Power Generation
Thermoelectric Power Generation

The book is written in a clear and concise manner, with numerous diagrams, tables, examples, and exercises to aid the understanding of the concepts. The book is suitable for undergraduate and postgraduate students of engineering, as well as professionals
and researchers in the field of renewable energy. The book is also useful for general readers who want to learn more about the alternative sources of energy that can help us meet our energy needs in a sustainable way.

The book can be accessed online for free from [^3^], or purchased from [^1^] or [^2^]. The book has received positive reviews from readers who have praised its coverage, clarity, and relevance. The book is a valuable resource for anyone interested in non-
conventional energy sources and their potential to transform our energy future.


Advantages and Disadvantages of Non-conventional Energy Sources Non-conventional energy sources have many benefits and drawbacks that need to be considered before adopting them. Some of the advantages and disadvantages of non-conventional energy sources are as follows:

Advantages of Non-conventional Energy Sources

They are renewable, meaning they will not run out unlike fossil fuels and nuclear energy.
They are environmentally friendly, meaning they do not produce harmful emissions or waste that contribute to global warming, acid rain, and radioactive contamination.
They are cheap to operate, meaning they do not require expensive fuel or maintenance costs once they are installed.
They provide employment opportunities, meaning they create jobs for people who are involved in the extraction, transportation, installation, and operation of non-conventional energy systems.
They reduce dependence on foreign energy sources, meaning they enhance energy security and self-reliance for countries that have abundant non-conventional energy resources.

Disadvantages of Non-conventional Energy Sources

They are expensive to set up, meaning they require high initial investment and infrastructure costs that may not be affordable for some countries or regions.
They are unreliable, meaning they depend on natural factors such as weather, season, and location that may vary or change unpredictably.
They have low efficiency, meaning they produce less energy per unit area or volume than conventional energy sources.
They have limited availability, meaning they may not be accessible or suitable for some areas or applications that require high or constant power supply.
They have negative impacts on local ecosystems, meaning they may disrupt or damage the natural habitats and biodiversity of plants and animals that live near non-conventional energy facilities.

Therefore, non-conventional energy sources have both advantages and disadvantages that need to be weighed carefully before choosing them as alternatives to conventional energy sources. The choice of non-conventional energy sources depends on various
factors such as availability, cost, efficiency, reliability, environmental impact, and social acceptability.
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