ME200 Lecture 41 - Course Review ME200 ThermodynamicsI Lecture41 December4th,2010 PurdueUniversity,Dr.TimPourpoint timothee@purdue.edu Today

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12/5/2010 1 Course Review ME 200 Thermodynamics I Purdue University , Dr. Tim Pourpoint – timothee@purdue.edu Lecture 41 December 4 th , 2010 Today •Cou r se Review –Ba s i c Terminology – Property Evaluation Models – First Law of Thermodynamics –Se cond Law of Thermodynamics – Steady Flow Devices –The rmodynam i c Cycles •Gas Power Cycles •Vapor Power Cycles • Refrigeration/Heat Pump Cycles ME 200 2 Prof. T.L. Pourpoint - Fall 2010
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12/5/2010 2 •S y s tem + Surroundings = Universe –C lo sed System (Control Mass) –Open System (Control Volume) – Isolated System Basic Terminology • Property is a characteristic of the given system –E x ten s ive Property e.g. mass, volume, energy –In s ive Property e.g. density, temperature –A l l specific properties are intensive properties ME 200 3 • State defined by a given set of properties – State Principle • Thermodynamic Equilibrium –The rma l Equilibrium – Mechanical Equilibrium – Phase Equilibrium Basic Terminology (contd.) –Chem i ca •P ro ce s s implies a change from one equilibrium state of the system to another Pth id i t th i ftt th h hi h th ME 200 4 • Path indicates the series of states through which the system passes during a process –Qua s i equilibrium Process Prof. T.L. Pourpoint - Fall 2010
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12/5/2010 3 • Evaluation of properties critical for any type of thermodynamic analysis Property Evaluation Models • We considered the following three models: –Pu re Substances • Property Diagrams and Tables – Incompressible Substances •Spec if ic volume a very weak function of pressure –Idea l Gases • Very high temperature and low pressure compared to critica ME 200 5 • Very high temperature and low pressure compared to critical state ( pv = RT ) • Compressibility Factor (Z) useful for quantifying the ideal gas behavior Z = pv/RT Property Evaluation Models (contd.) p R = p/p cr and T = T/T cr • Change in Internal Energy and Enthalpy ( h = u + pv ) – Incompressible Substances du = cdT and dh = du + vdp ME 200 6 – Ideal Gases du = c v dT and dh = c p dT Prof. T.L. Pourpoint - Fall 2010
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12/5/2010 4 •S y s t e m properties are changed through work and heat interactions –W o r k Interactions • Mechanical Wor First Law of Thermodynamics • Mechanical Work –C lo s ed System, Quasi equilibrium Process: w= p dv –Op en System, Quasi equilibrium Process: w= v dp ME 200 7 •O the r Forms –H e a t Interactions •Th ree modes (conduction, convection and radiation) available •F i r s t law of thermodynamics is a statement of energy conservation •C sed System (Control Mass) First Law of Thermodynamics (contd.) •Open System (Control Volume) QW E U K E P E  CV ii ee inlets exits dE QW m m dt    ME 200 8 22 CV CV VV Ee g z d h g z      Prof. T.L. Pourpoint - Fall 2010
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12/5/2010 5 •I s every process where the first law of thermodynamics is satisfied possible?
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This note was uploaded on 12/11/2011 for the course ME 200 taught by Professor Gal during the Fall '08 term at Purdue University-West Lafayette.