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Test 1A

As requested by the Dean's office, please announce Bldg Q Building Hours stated below in your classes: Mon - Fri Open 7:00 am Close 12:00 midnight Sat & Sun Open 8:00 am Close 5:00 pm Closed on All University Holidays. Test 1A. First law of thermodynamics; closed system Voluntary

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Test 1A

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  1. As requested by the Dean's office, please announce Bldg Q Building Hours stated below in your classes:Mon - FriOpen 7:00 amClose 12:00 midnightSat & SunOpen 8:00 am Close 5:00 pmClosed on All University Holidays

  2. Test 1A • First law of thermodynamics; closed system • Voluntary • 9/18 review T1; review session • Review session T1A 9/20 • T1A 9/25 • Higher grade: T1 or T1A • Open book for tables & conversion • Formula sheet • Closed notes: no solved problems

  3. Open system • First law of thermodynamics: statement of mass & energy conservation • Steady state: no accumulation nor depletion in C • Single stream: one inlet & one outlet

  4. Energy • Specific kinetic: V2/2 • Specific potential: gz • Specific internal: u • Modify for flow system (open): specific flow energy, pv

  5. Enthalpy • h = u + pv • A system property • Condensible working fluid – table value • Ideal gas: h = Cp T absolute value * Cpassumed temperature independent • Table A–22 & A-22E air as ideal gas; h as temperature dependent

  6. Specific heats • Temperature dependence A-20 & 20E • Other gases: A-23 & 23E: molar values

  7. First law of thermodynamics • Open system: working equation • Steady state; single stream • Consistent units

  8. Problem-solving • Read carefully • Sketch system • Assumptions • Working equation based on understanding • Solve, with units • Reasonable

  9. Engineering devices • Steady flow • Nozzles & diffusers • Turbines • Pumps, fans compressors • Throttling devices: valves • Heat exchangers

  10. Assignment • Chapter 4 through Section 4.6 • Homework handout due 9/27

  11. References • Images & problems from the following • Engineering Thermodynamics 4th Ed. Burghardt & Harbach • Thermodynamics 3rd Ed. Black & Hartley • Thermodynamics, an Engineering Approach 6th Ed. Cengel & Boles • Which images were helpful?

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