Chapter 2 first law for clsoed systems

Chapter 2 first law for clsoed systems - Engineering MAAE...

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1 Chapter 2. Engineering MAAE 2400C Thermodynamic and Heat Transfer FIRST LAW OF THERMODYNAMICS FOR CLOSED SYSTEMS Carleton University Department of Mechanical and Aerospace Engineering OUTLINE 2.1 Introduction 2.2 First Law of Thermodynamics for Closed Systems - Closed System - Statement of First Law for Closed Systems - Sign Convention - Different Formulations 23 Energy Prepared by Gauthier & Kaya 2.3 Energy - Introduction - Kinetic Energy, KE - Potential Energy, PE - Internal Energy, U
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2 OUTLINE (Continued) 2.4 Energy Transfer by Work - Expansion and Compression - Other Examples of Work * Shaft Work * Friction Work 2.5 Summary Prepared by Gauthier & Kaya Reading Assignment : Chapter 2 in Fundamentals of Engineering Thermodynamics, M. Moran and H. N. Shapiro. Following are important facts regarding energy: 2.1 Introduction Energy can be stored within systems in various forms Energy can be transformed from one form to another The total amount of energy is conserved in all transformations Prepared by Gauthier & Kaya The only energy interactions associated with closed system are work and heat transfer .
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3 Closed System Reminder: a closed system has a fixed quantity of matter. 2.2 First Law of Thermodynamics for Closed Systems Piston-Cylinder Arrangement Piston Weight Prepared by Gauthier & Kaya Gas 2.2 First Law of Thermodynamics for Closed Systems (Cont’d) Statement of First Law for Closed Systems Consider the closed system illustrated in the figure below. p 1 T 1 v 1 etc CS p 2 T 2 v 2 etc CS Prepared by Gauthier & Kaya m 1 m 2 State 1 at time t 1 State 2 at time t 2
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4 2.2 First Law of Thermodynamics for Closed Systems (Cont’d) Statement of First Law for Closed Systems (Cont’d) The First Law of thermodynamics (also called the Energy Conservation Equation) for a closed system can be written as Conservation Equation) for a closed system can be written as: system the o energy tota E where System Closed Thermo of Law First W Q E E 2 1 2 1 1 2 Prepared by Gauthier & Kaya system the on, or by, done work W system the to, or by, heat by transfer energy Q of total : : : 2 1 2 1 2.2 First Law of Thermodynamics for Closed Systems (Cont’d) Sign Convention E 2 - E 1 = 1 Q 2 - 1 W 2 The sign convention for Q and W is as follows: Q > 0: heat transfer TO the system
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This note was uploaded on 01/20/2011 for the course MAAE 2400 taught by Professor Johngaydos during the Winter '10 term at Carleton CA.

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Chapter 2 first law for clsoed systems - Engineering MAAE...

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