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# Lec09 - ME 200 Thermodynamics I Lecture 9 Evaluating...

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ME 200: Thermodynamics I Lecture 9: Evaluating properties Sections 3.1-3.3 Problems: SP9; 3.7, 3.10 Professor Hukam Mongia Office Hours: MWF 2:30 to 3:30 pm in ME 83 (Other times email for appointment) Email: [email protected] Phone: 765-494-5640 Course Website: https://engineering.purdue.edu/ME200 Course Secretaries: Diana Akers (ME 84) and Marilyn Morrison (ME 100) See Kul Inn (ME 189) about grading Homework Assignments 9/8/2009 1 Problem answers: 3.7 (a) v=0.1879 m 3 /kg, (b) 260 o C, (c) v=0.15567 m 3 /kg; 3.10: (a) 133.6 o C, (b) v=1.1319x10 -3 m 3 /kg, (c) v=0.309 m 3 /kg, (d) v=1.0042 m 3 /kg

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Last Lecture Cycles Power Cycles Refrigeration and Heat Pump Cycles 9/8/2009 2 Prof. Lucht's lecture notes modified
This Lecture Pure Substance Phase Phase Change Property Diagrams 9/8/2009 3 Prof. Lucht's lecture notes modified

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9/8/2009 4 Let us recall 1 st : 0 th Law of Thermodynamics and property of water gave us definition of temperature, T. Pascal gave us definition of pressure p=Force/Area Newton’s 2 nd law of motion (when simplified to one- dimension, along with definition of pressure) gave definition of work:
9/8/2009 5 Joule’s experiment gave us the property, Energy: E 2 -E 1 =-W adiabatic Energy balance on a closed system gave us:

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9/8/2009 6 Heat transfer rates by conduction, convection and radiation given by: How many properties (p, T, v, ----) we need to measure/calculate?
9/8/2009 7 State Principal So far we have seen that energy of a closed system can be varied independently by heat or work. Heat can be varied through heat transfer, which is a function of temperature (I need to know T or equivalent property). Energy/work interaction requires properties (p, v).

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Lec09 - ME 200 Thermodynamics I Lecture 9 Evaluating...

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