Lecture11_Property_tables2-handout

Lecture11_Property_tables2-handout - ME200 : Thermodynamics...

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1 Professor: Euiwon Bae Lecture Hours : MWF 1:30-2:20 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 11 : Evaluating properties2
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2 Announcement 1 st Exam on Sep 20 th 8-9 PM at CL50 Room 224 Lecture 1-11 (Monday slide Lect12+ Review) SP8-10 Due Friday 3:30 PM Will return graded SP on Monday No class on Wednesday 9/21 due to evening exam Review graded quizzes
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3 Outline Evaluating u (internal energy) and h (Enthalpy) Applying Energy balance with Table values Examples
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4 Enthalpy - In thermodynamics, the sum of internal energy (U) and product - Measure of total energy in thermodynamic system - Absolute value is cannot be measured directly - Typically Δ° is what we are interested in - Assume a constant pressure expansion of piston with internal energy decrease Δ° = Δ? + ?Δ? → Δ? <0, ?Δ? >0
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5 Property tables - Rest of the property tables (internal energy, enthalpy, entropy) - Similarly as the ν; for saturation states (u f , u g , h f _,h g ) u = 1 − x u F + xu G = u F + x u G − u F ; h = 1 − x h F + xh G = h F + x h G − h F
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6 Property tables + Energy balance - Combining the property look up with the Energy balance Draw diagram Determine (Liquid/SHV/Sat urated Liquid/Saturated Vapor/quality (Appropriate Table) PE Energy balance What is the (air,water,R 34, etc)
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Lecture11_Property_tables2-handout - ME200 : Thermodynamics...

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