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# Unit 2 - Engi2800(Section I Engineering Thermodynamics I...

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09/16/09 http://jjl.me.dal.ca/Engi2800 1 J.M. Chuang Dalhousie University Dept. of Mechanical Engineering Last Modified: September 16, 2009 Unit #2 ( Textbook Reference: Ch.2 ) Introductory Concepts and Definitions Engi2800 (Section I) Engineering Thermodynamics I

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09/16/09 http://jjl.me.dal.ca/Engi2800 2 Contents Types of Systems (Closed, Open, Isolated) Approach to Describe System (Macroscopic and Microscopic Approaches) Thermodynamic Properties (Extensive and Intensive Properties) Phase of Substance Equilibrium Process and Path Quasi-Equilibrium Process Piston-Cylinder Device Thermodynamic Cycle Energy The Zeroth Law of Thermodynamics Temperature Scale Summary for Thermodynamic System
09/16/09 http://jjl.me.dal.ca/Engi2800 3 Thermodynamic System (System) A quantity of matter or a region in space chosen for study Surroundings The mass of region outside the system System + Surroundings Universe (Limited scope) System Boundary The surface that separates the system from surroundings, or the contact surface shared by both the system and the surroundings. System boundary could be Real or Imaginary Fixed or Movable System, Boundary, Surroundings and Universe

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http://jjl.dal.ca/Engi2800 4 Types of Systems There are three types of systems Closed System (a.k.a. Control Mass) Open System (a.k.a. Control Volume) Isolated System
http://jjl.dal.ca/Engi2800 5 Consists of a fixed amount of mass No mass can cross its boundary Energy (heat or work) can cross the boundary The volume does not have to be fixed Note: A commonly encountered example of a closed system Piston-cylinder device (an idealized device): Leak proof (Closed system) Massless and frictionless piston Closed System (a.k.a. Control Mass) Closed System Mass No Energy Yes m = constant

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http://jjl.dal.ca/Engi2800 6 Open System (Control Volume) A properly selected region in space Both mass and energy can cross boundary Usually a device that involves mass flow Examples: compressor, turbine or nozzle Air Flow Imaginary boundary Real Boundary Control Volume: Nozzle Air flow out Apply pressure to move piston down Fixed boundary Control Volume: Piston-cylinder device with opening Moving boundary Imaginary boundary Imaginary boundary
7 Isolated System No mass, heat and work can across the boundary of the system No influenced by the surroundings. Example: Insulated rigid container, such as an insulated gas cylinder.

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Unit 2 - Engi2800(Section I Engineering Thermodynamics I...

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