Meen 315- Lecture 4

Meen 315- Lecture 4 - 1.10 Manometer 1.11 Atm Press 1.12...

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9/2/2008 1 Lecture 04: Chapter 02 :ENERGY, ENERGY TRANFER AND ENERGY ANALYSIS This Class 1.10 Manometer 1.11 Atm Press 1.12 Problem Solving (Skip) Chapter 2.1. Introduction 2.2 . Energy ( E) Forms 2.3. Transfer of E via heat (Q) 2.4. Transfer of E via work (W) 2.5. Mech Forms of W Next Class 2.6. 1 st Law of Thermo 2.7. Efficiencies 2.8. Energy and Environment
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9/2/2008 2 5-4—5-5 Heat exchangers, transient flow Oct 8 W 14 5-4 Nozzles, diffusers, turbines, compressors, heat exch. Oct 6 M 13 Optional review in class Exam 1, Thurs, 10/2, 7-9 p.m., location TBA Oct 1 W 12 5-2—5-3 Flow work, steady-flow systems Sept 29 M 11 5-1 Conservation of mass Sept 24 W 10 4-2—4-5 Energy balance, spec. heats, internal energy, enthalpy Sept 22 M 9 3-6—3-8, EES, 4-1 Property equations (of state), boundary work Sept 17 W 8 3-5 Property data Sept 15 M 7 2-6—2-8, 3-1—3-4; Notes 1 st Law, efficiency, phases, phase changes; communicating references Sept 10 W 6 2-3—2-6; Notes Heat, work, first law of thermodynamics; communicating abstracts Sept 8 M 5 2-1—2-5; Notes Intro to EES, energy, heat, work; communicating tables and figures Sept 3 W 4 1-8—1-12; Notes Temperature, pressure; communicating equations Sept 1 M 3 1-4—1-7 Properties, states, equilibrium, processes Aug 27 W 2 1-1—1-3 Introduction, conservation of energy, dimensions and units, problem solving, systems Aug 25 M 1 Read Subject Date Day Meeting B A S I CS s t L a w: E n e r g y
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9/2/2008 3 HOMEWORK: Chapter 02 (Team; one submission per team) Due Date:Wed, Sep 17, 2008 • HOMEWORK ASSIGNMENT # 2: Chapter 2 1) 17, 2) 31, 3) 40, 5) 53, 6)71, 7) 87E, 8) 91 • 9) a) Calculate Atomic Energy (AE) of 1 g of matter (using AE=mc 2 ) and show that it is equal to 9*10 10 kJ; b) Convert 40 kW into HP; c) Energy content of gasoline is about 46 MJ/kg or about 37 MJ/Liter. A small car with engine of specified capacity (e.g. say 40 kW ) consumes 10 L per hr (e.g. say when traveling at 120 km/hr at 80 % of engine output) . How much energy consumed in kJ per hr? ;d) calculate collapse energy (i.e. PE change ) Towers: 410 m tall; total mass 1.25 Mega tons; Calculate Change in PE during Collapse assuming the whole mass is centered at an average height :Note that parts (a), (b) , ( c), (d) are all independent problems EXERCISE PROBLEMS FROM CHAP 1 and 2 of TEXT posted on WEB for the benefit of students who do not have TEXT
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9/2/2008 4 THREE IMPORTANT EQUATIONS Mass Conservation (Chap 1 and 5): First Law or Energy Conservation(Chap 4 and 5) •E cv = U+KE+PE, Second Law or Entropy Balance Equation (Not in Text) cv e exit e e i inlet i i j j b j cv s m s m T Q dt dS σ ± ± ± ± + + = = = , + + Σ + + Σ + = e e e e i i i i cv cv CV gz h m gz h m W Q dt dE 2 V 2 V 2 2 = = = exit e e inlet i i cv m m dt dm ± ±
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9/2/2008 5 Due to special requirements of certain students we have to seat them near the board for whole semester ; In order to keep identities confidential, we had mixed them with regular students and seated them in Front Row Teams 1-3; they will not move for the whole semester. Thus teams have been re-
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Meen 315- Lecture 4 - 1.10 Manometer 1.11 Atm Press 1.12...

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