Lect3_BasicConceptsDiv2&5ME200SP2012

Lect3_BasicConceptsDiv2&5ME200SP2012 - ME 200:...

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ME 200: Thermodynamics I Lecture 3: Basic Thermodynamic Concepts
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Last Lecture What is thermodynamics? » Study of energy transformations » Relationships among physical quantities of different substances affected by such transformations Two approaches » Classical thermodynamics: macroscopic (considers large scale behavior) » Statistical thermodynamics: microscopic (considers molecular scale behavior) In ME 200, we will focus on understanding large scale behavior, statistical viewpoints in a supporting role Dimensions and units
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This Lecture Discuss some terms and concepts commonly used in thermodynamic analysis » System » Property » State » Equilibrium » Process » Cycle » Energy
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System and Surroundings What is a thermodynamic system? » Any three-dimensional region of space bounded by one or more arbitrary geometric surfaces What is meant by the term surroundings? » The region of space outside the arbitrary boundaries System boundary may be real or it could be immaginary The system may be stationary or moving
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System and Surroundings Identification of system and its surroundings is the critical first step to begin thermodynamic analysis – this approach is in contrast to looking through the book to find the equation that you can plug numbers into in order to solve the homework problem A good control volume diagram indicating system and surroundings is crucial in a systematic approach to thermodynamic analysis
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Types of Systems System interacts with its surroundings in two possible ways » Exchange of mass across boundary » Exchange of energy across boundary Closed System allows transfer of energy only across its boundaries; no mass transfer » Chemical composition within the system may change; but mass remains constant (volume may change) » Closed System = Control Mass
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Types of Systems (contd.) Open System allows transfer of energy as well as
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This note was uploaded on 01/26/2012 for the course ME 200 taught by Professor Gal during the Spring '08 term at Purdue University-West Lafayette.

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Lect3_BasicConceptsDiv2&5ME200SP2012 - ME 200:...

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