Lecture12_Specific heats incompressible substances-handouts

Lecture12_Specific heats incompressible substances-handouts...

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1 Professor: Euiwon Bae Lecture Hours : MWF 1:30-2:20 ME1130 Office Hours : MWF 2:30-3:30 in ME1091 Email : ebae@purdue.edu Phone : 765-494-6849 Course website : http://engineering.purdue.edu/ME200 ME200 : Thermodynamics I Lecture 12 : Specific heats incompressible substances
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2 Announcement 1 st Exam on Sep 20 th 8-9 PM at CL50 Room 224 Lecture 1-11 (Bring calculators) SP11-12 Due Friday 3:30 PM No class on Wednesday 9/21 due to evening exam
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3 Outline Specific heats Incompressible substance Examples
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4 Specific heat - Three properties related to internal energy (1) Enthalpy (2) Specific heat cv (3) Specific heat cp - Intensive properties - Defined for pure, simple compressible substances - Subscript variables are assumed fixed - Measure of the energy required to increase T at const. V and const. P Constant volume Constant pressure
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5 Evaluating Properties of Liquids and Solids - For Liquid and solids there exists some accurate approx. - No need the tables - For compressed liquids (1)Use the exact table (2)Approximate using saturated liquid data (3) Incompressible substance model
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6 Exact table (1) Use the exact table - Limited availability Table A-5
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7 Approximation (2) Approximate using saturated liquid data Let’s look at A-5 again, v and u change little for T=const. T ν Liquid-Vapor liquid Vapor isobaric T ν liquid isobaric Saturated liquid line T=C ν f ν
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8 Approximation Using the definition of Enthalpy (h) h=u+pv ?, ? ≈ ? ? (?) + ?± ? ? Or At saturation pressure P sat v=v f , u=u f , h=h f h f =u f +p sat v f ?, ? ≈ ℎ ? ? + ± ? ? ? − ? ²³´ ? When ± ?
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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.

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Lecture12_Specific heats incompressible substances-handouts...

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