eml 3100 lec 2 2011

eml 3100 lec 2 2011 - Thermodynamics !

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UNIVERSITY OF FLORIDA Lecture No. 2 1 Thermodynamics ! Units:   SI and British Engineering, see your text Be able to write units correctly, e.g. kWh Basic units: Length: m and ft Mass: kg and lbm Force: Newton and lbf Power: Watt and btu/h or hp Pressure: kPa (kiloPascal) or psi Temperature: deg C and deg F, R,K
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UNIVERSITY OF FLORIDA Lecture No. 2 2 Thermodynamics System:  A quantity of matter selected for study. System Surroundings (what is outside the system) Boundary
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UNIVERSITY OF FLORIDA Lecture No. 2 3 Thermodynamics Closed System: No mass crosses the boundary. System Surroundings (what is outside the system) Boundary Example: heating a closed cylinder of gas. Heat transfer
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UNIVERSITY OF FLORIDA Lecture No. 2 4 Thermodynamics Closed System: No mass crosses the boundary. System Surroundings (what is outside the system) Boundary Example: heating a gas in a piston cylinder device Heat transfer Moving Boundary
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UNIVERSITY OF FLORIDA Lecture No. 2 5 Thermodynamics Open System: Mass crosses the boundary. System Surroundings (what is outside the system) Boundary Example: gas flowing in and out of a cylinder
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UNIVERSITY OF FLORIDA Lecture No. 2 6 Thermodynamics Thermodynamics: We study energy changes related to the systems just described. We look at  changes .  We do not concern ourselves with the total  absolute energy of the system.  Too hard and not useful to us. Properties: In the analysis of the changes of energy in a system, we need to know  some of the characteristics or properties of the system… Intensive properties , do not depend on mass, e.g. temperature and  pressure Extensive properties , do depend on mass, e.g. Mass, Kg and Volume,  m 3 FE exam question!!!! Note: “system” is generally “stuff”…liquid, solid, gas, etc.
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UNIVERSITY OF FLORIDA Lecture No. 2 7 Thermodynamics Condition or State: The  condition or state  of a system  is identified using  properties of the system such as temperature, pressure  and specific volume. e.g.  Saturated liquid, compressed liquid, saturated vapor,  two phase, superheated vapor, critical point States can be fixed or changing .  If the state of a system is  fixed, then we know that the system is in equilibrium and  its properties are in a state of balance. We call it a  process  when a system changes from one  equilibrium state to another.
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UNIVERSITY OF FLORIDA Lecture No. 2 8 Thermodynamics Path: A series of states a system goes through during a process. Some properties may stay constant during a process: e.g. an isobaric process is one where the pressure is  constant, isothermal: temperature is constant State Postulate: The state of a simple compressible system (gas) is  completely specified by two independent, intensive  properties, e.g. temperature and pressure.  What does this 
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eml 3100 lec 2 2011 - Thermodynamics !

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