Chapter 3 The First Law of

Chapter 3 The First Law of - Chapter 3 The First Law of...

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Unformatted text preview: Chapter 3 The First Law of Thermodynamics: Closed System 3-1-1 Conservation of energy principle Energy can be neither created nor destroyed;it can only change forms 3-1 Introduction To The First Law of Thermodynamics 3-1-2 The First Law of Thermodynamics Neither heat nor work can be destroyed;they can only change from one to another, that is: W Q = 3-1-2 The shortcomings of Q=W • Can’t be employed in engineering calculation • Can’t show the quality difference between heat and work In engineering area we would rather use a formula like this: The net change in the total energy of the system The net energy transferred to the system- The net energy transferred from the system = 3-2 Work 3-2-1 Definition: work is the energy transfer associated with a force acting through a distance W Work is energy in transition Denoted by W ---------- kJ work on a unit-mass basis is denoted by w w---------- kJ/kg work done per unit time is called power power is denoted as 3-2-2 Positive and negative Since work is the energy transferred between system and its boundary, then we define that: work done by a system is positive; and work done on a system is negative 3-3-1...
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This note was uploaded on 04/18/2010 for the course MECH 0122 taught by Professor Phd during the Spring '10 term at University of Central Arkansas.

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Chapter 3 The First Law of - Chapter 3 The First Law of...

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