Efficiency is one of the most frequently used terms in thermodynamics and it indicates how
well an energy conversion or process is accomplished. Efficiency is also one of the most
frequently misused terms in thermodynamics and is often a source of misunderstanding. This is
because efficiency is often used without being properly defined first. This book intends to
provide a comprehensive evaluation of various efficiencies used for energy transfer and
conversion systems including steady-flow energy devices (turbines compressors pumps nozzles
heat exchangers etc.) various power plants cogeneration plants and refrigeration systems.
The book will cover first-law (energy based) and second-law (exergy based) efficiencies and
provide a comprehensive understanding of their implications. It will help minimize the
widespread misuse of efficiencies among students and researchers in energy field by using an
intuitive and unified approach for defining efficiencies. The book will be particularly useful
for a clear understanding of second law (exergy) efficiencies for various systems. It may serve
as a reference book to the researchers in energy field. The definitions and concepts developed
in the book will be explained through illustrative examples.
