Energy is
defined as the capacity of a substance to do work. It is a property of the
substance and it can be transferred by interaction of a system and its
surroundings. The student would have encountered these interactions during the
study of Thermodynamics. However, Thermodynamics deals with the end states of
the processes and provides no information on the physical mechanisms that
caused the process to take place. Heat Transfer is an example of such a
process. A convenient definition of heat transfer is energy in transition due
to temperature differences. Heat transfer extends the Thermodynamic analysis by
studying the fundamental processes and modes of heat transfer through the
development of relations used to calculate its rate.
The aim of
this chapter is to console existing understanding and to familiarise the
student with the standard of notation and terminology used in this book. It
will also introduce the necessary units.
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