Lecture2 - 1 Basic Thermodynamic Concepts Basic Thermodynamic Concepts ME 200 Purdue University Dr Tim Pourpoint – [email protected] ME 200

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Unformatted text preview: 8/24/2010 1 Basic Thermodynamic Concepts Basic Thermodynamic Concepts ME 200 Purdue University , Dr. Tim Pourpoint – [email protected] ME 200 Thermodynamics I Lecture 2 August 25 th , 2010 • 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 Last Lecture Last Lecture ME 200 ME 200 2 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 This Lecture This Lecture • Today’s agenda – Closed/Open Systems – Properties – State & equilibrium – Processes – Cycles P ME 200 ME 200 3 – Pressure – Energy • Objectives – General property definitions – States and equilibrium definitions – Processes and cycles 8/24/2010 2 Systems Systems – Closed and Open Closed and Open ME 200 ME 200 4 • Features: – Fixed amount of mass – No mass can cross its boundary – Energy (in form of heat and work interactions) can cross boundary – Volume of closed system does not Closed System (Control Mass) Closed System (Control Mass) ME 200 ME 200 5 have to be fixed • Properly selected region of space; usually encloses device which involves mass flow i.e. compressor, turbine, or nozzle • Both mass and energy can cross the boundary of a CV, which is called a control surface (CS Open system (control volume) Open system (control volume) ME 200 ME 200 6 which is called a control surface (CS) • Note: Form of thermodynamic relations are different for open and closed systems so it is important to identify what type of system you are considering first to determine proper analysis 8/24/2010 3 Control Volumes Control Volumes ME 200 ME 200 7 System and Surroundings 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 ME 200 ME 200 8 A good control volume diagram indicating system and surroundings is crucial in a systematic approach to thermodynamic analysis • Any characteristic of a system is a property i.e.: pressure P, temperature T, volume V, mass m, etc....
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This note was uploaded on 09/19/2010 for the course ME 200 taught by Professor Gal during the Spring '08 term at Purdue University-West Lafayette.

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Lecture2 - 1 Basic Thermodynamic Concepts Basic Thermodynamic Concepts ME 200 Purdue University Dr Tim Pourpoint – [email protected] ME 200

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