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ME 40 Thermodynamics

ME 40 Thermodynamics. Professor Jeff Marshall 231A Votey Hall 656-3826; jeffm@cems.uvm.edu Office Hours TTh 9-10am. Class Details. Class website (use Internet Explorer) http://www.cems.uvm.edu/~jeffm/me40/me_40a_home.html Lecture Notes – download from website and bring to class

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ME 40 Thermodynamics

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  1. ME 40Thermodynamics Professor Jeff Marshall 231A Votey Hall 656-3826; jeffm@cems.uvm.edu Office Hours TTh 9-10am

  2. Class Details • Class website (use Internet Explorer) http://www.cems.uvm.edu/~jeffm/me40/me_40a_home.html • Lecture Notes – download from website and bring to class • Textbook - Thermodynamics: An Engineering Approach, Çengel & Boles, McGraw-Hill, 6th ed. • Class attendance is mandatory

  3. Grading • Homework (weekly) 20% • Midterm Exam 1 25% [last week of Feb] • Midterm Exam 2 25% [last week of March] • Final Exam 30% 5/5/08 [11:45am – 2:45pm] Notes: Exams 1 & 2 are tentatively scheduled for these periods. Pre-examination review sessions will be held prior to each examination at dates & times to be decided.

  4. Class Topics • Basic Concepts in Thermodynamics: systems, temperature & pressure, units, energy, energy transfer (work & heat), first law, efficiencies (Chapters 1 & 2) • Thermodynamic Properties of Pure Substances: phases, change of phase, tables & data interpolation, internal energy, enthalpy, specific heat, ideal-gases, equations of state, non-ideality (Chapter 3). • First Law Analysis of Closed Systems: boundary work, energy balances, internal energy, enthalpy & specific heats of gases (Chapter 4) • First Law Analysis for Open Systems: steady-state/flow & unsteady-state flow, analysis of simple engineering devices (Chapter 5). • Second Law of Thermodynamics: statements of second law, irreversibilities, heat engines, refrigerators & heat pumps, & Carnot cycles (Chapter 6). • Entropy: concept of entropy, Tds relationships, entropy change, isentropic processes (Chapter 7). • Introduction to Gas Power Systems (Chapter 9: Sections 9.1 through 9.8) • Introduction to Vapor Power Systems (Chapter 10: Sections 10.1 – 10.6)

  5. What is Thermodynamics? ?

  6. What is Thermodynamics? Literal meaning: Thermo ----- heat Dynamics ---- force Modern meaning: Thermodynamics is the study of conversion between different forms of energy.

  7. Examples? • Mechanical ? • Civil ? • Electrical ?

  8. Approach to Problem Solving 1. Understand problem What are you supposed to solve for? List given conditions Draw sketch with labels 2. Plan solution approach State assumptions (are the assumptions reasonable or just convenient?) Develop a plan (approach) by which the problem may be solved 3. Obtain solution Derive or choose appropriate mathematical formulas Plug in numbers to appropriate equations AFTER ALL FORMULAS HAVE BEEN OBTAINED Check units by using a unit equation Report only significant digits Are results reasonable?

  9. Example What is known? What do you need to find? Plug in numbers at end Draw a picture State assumptions Is answer reasonable? Do analysis using EQUATIONS

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