Chapter_1_lecture.pdf

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Thermodynamics: An Engineering Approach, 6 th Edition
Yunus A. Cengel, Michael A. Boles
McGraw-Hill, 2008
Chapter 1
INTRODUCTION AND
BASIC CONCEPTS
Created by Mehmet Kanoglu
Modified by Kai Ming Kiang
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
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Objectives
•
Identify the unique vocabulary associated with
thermodynamics through the precise definition of
basic concepts to form a sound foundation for the
development of the principles of thermodynamics.
•
Review the metric SI and the English unit systems.
•
Explain the basic concepts of thermodynamics such
as system, state, state postulate, equilibrium, process,
and cycle.
•
Review concepts of temperature, temperature scales,
pressure, and absolute and gage pressure.
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THERMODYNAMICS AND ENERGY
•
Thermodynamics : The science of
energy.
•
Energy : The ability to cause changes.
•
The name thermodynamics stems from
the Greek words therme (heat) and
dynamis (power).
•
Conservation of energy principle :
During an interaction, energy can change
from one form to another but the total
amount of energy remains constant.
•
Energy cannot be created or destroyed.
•
The first law of thermodynamics : An
expression of the conservation of energy
principle.
Energy cannot be created
or destroyed; it can only
change forms (the first law).
•
The first law asserts that energy is a
thermodynamic property.
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•
The second law of thermodynamics:
It asserts that energy has quality as
well as quantity , and actual processes
occur in the direction of decreasing
quality of energy.
•
Classical thermodynamics : A
macroscopic approach to the study of
thermodynamics that does not require
a knowledge of the behavior of
individual particles.
Conservation of energy
principle for the human body.
•
It provides a direct and easy way to the
solution of engineering problems and it
is used in this text.
•
Statistical thermodynamics : A
microscopic approach , based on the
average behavior of large groups of
individual particles.
•
It is used in this text only in the
supporting role.
Heat flows in the direction of
decreasing temperature.
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Application Areas of Thermodynamics
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