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### HEMethod

Course: ME 416, Fall 2008
School: Michigan State University
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Word Count: 591

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416 Computer ME Assisted Design of Thermal Systems Heat Exchanger Calculations Effectiveness-Ntu Method Two Types of Problem: Rating Problem or Sizing Problem Rating Problem: The heat transfer surface area is known. Exit temperatures are unknown. This is like using a heat exchanger given to you off the shelf, where you know everything about it except for how it works. That is, what exit temperatures it will...

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416 Computer ME Assisted Design of Thermal Systems Heat Exchanger Calculations Effectiveness-Ntu Method Two Types of Problem: Rating Problem or Sizing Problem Rating Problem: The heat transfer surface area is known. Exit temperatures are unknown. This is like using a heat exchanger given to you off the shelf, where you know everything about it except for how it works. That is, what exit temperatures it will produce. You will be able to calculate the Ntu from information given, but will have to calculate or determine the effectiveness from an -Ntu relationship or graph. Sizing Problem: All of the operating conditions are known or can be calculated from the first law of thermodynamics. The heat transfer surface area is unknown. This is like being told what temperature requirements the heat exchanger must have and then calculating how large it must be. You will be able to calculate the effectiveness from the information given, but will have to calculate or determine the Ntu from an -Ntu relationship or graph. When working a heat exchanger problem several questions need to be answered up front. Among them are: 1. Is the problem a rating problem or a sizing problem? 2. What type of heat exchanger are we using? What are the appropriate effectivenessNtu equations or graph? 3. Is the overall heat transfer coefficient specified or are we going to calculate from: (1) the effectiveness-Ntu calculations (like a sizing problem except the area is specified) or (2) employ a thermal circuit model and Nusselt number correlations for the convective heat transfer coefficients? 4. How are we going to handle the cP evaluation? Once these questions are addressed the problem can be set up in the format shown below and the given conditions can be entered on the table. 1 ME 416 CAD of Thermal Systems Solution Problem Table Type: (Rating or Sizing) Heat Exchanger Type: (crossflow, tube & shell, etc.) Fluid #1 (Water) Hot TH,in = TH,out = TH,avg = cP,H = & mH = CH = = Cmax or Cmin mixed or unmixed U= A= = Ntu = Then depending on whether we have a sizing problem or a rating problem two different solution methodologies can be used. Fluid #2 (Air) Cold TC,in = TC,out = TC,avg = cP,C = & mC = CC = = Cmax or Cmin mixed or unmixed 2 ME 416 CAD of Thermal Systems Rating problem methodology 1. Evaluate specific heats at inlet temperatures 2. Calculate CH and CC. Determine Cmin and Cmax and calculate Cr = C min C max 3. Calculate U. 4. Calculate Ntu = UA C min 5. Use appropriate effectiveness-Ntu equation or graph to determine the effectiveness. 6. Calculate the actual heat transfer & & q act = q max = C min (TH,in - Tc,in ) 7. Use the first law to calculate the exit temperatures TH,out = TH,in TC,out = TC,in & q act CH & q + act CC 8. Re-evaluate the specific heats at the average temperatures and repeat steps 2-7 as needed. 3 ME 416 CAD of ...

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Michigan State University - ME - 416
ME 416Computer Assisted Design of Thermal SystemsHeat Exchanger Relationships Basic Definitions=Effectiveness) C (T -T &amp; q act = H H,in H,out &amp; q max Cmin (TH,in - TC,in )=Cmin (TH,in - TC,in )CC (TC, out - TC,in )Number of Transfer Uni
Michigan State University - ME - 477
ME 477 MANUFACTURING PROCESSES Spring 2007 SEMESTER MW 4:10 5:30 PM, Room 2400 Engineering BuildingInstructor: Alfred C. Loos Office: 2244 Engineering Building; Phone 432-0844 E-mail: aloos@egr.msu.edu Office Hours: MWF 1:30 2:30 PM, Other times
Michigan State University - ME - 477
INTRODUCTION AND OVERVIEW OF MANUFACTURING1. 2. 3. 4. 5. What is Manufacturing? Materials in Manufacturing Manufacturing Processes Production Systems Organization of the Book2007 John Wiley &amp; Sons, Inc. M P Groover, Fundamentals of Modern Manufact
Michigan State University - ME - 477
ME 477 MANUFACTURING PROCESSES Spring 2007 Prerequisite: ME 222 and MSE 250 Text: Fundamentals of Modern Manufacturing: Materials, Processes, and Systems, 3rd ed., by Mikell P. Groover, Wiley, 2007. No. Date 1 M 1/8 2 W 1/10 M 1/15 3 W 1/17 4 M 1/22
Michigan State University - ME - 475
ME 475 - Optimization of a TrussAnalysis Problem Statement: The following problem will be analyzed using Abaqus and optimized using HEEDS. 4 5 2 1 300 kN 22 m 35 mFigure 1 Full truss geometry and loading.8 11 10 6m3 6 7 300 kN 912All joints
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ME 475 Computer Aided Design of Structures Spring, 2009Course Computational methods for analysis, design, and optimization of structural Description: components. Basic concepts in geometric modeling, finite element analysis, and structural optimizat
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ME 475 Useful InformationRunning analyses/optimization runs: Hard drive space has been setup for this class. Windows: T:\courses\personal\me475\&lt;username&gt; UNIX: /egr/courses/personal/me475/&lt;username&gt; This space is good for saving your projects afte
Michigan State University - ECE - 418
ECE 418: Algorithms of Circuit DesignDue Friday (09/08/2006)Homework1Unless otherwise stated assume the transistor parameters given in the text-book (Johns and Martin section 1.9). 1) 2) 3) Solve problem 1.8 in the text-book [4 points]. Solve Pr
Michigan State University - ECE - 418
ECE 418: Algorithms of Circuit DesignDue Friday (09/22/2006)Homework3For all the problems use the transistor plot shown in Figure 1. Use approximations if required but with proper justification. Assume all transistors are of equal size and the t
Michigan State University - ECE - 418
ECE 418: Algorithms of Circuit DesignDue Friday (10/06/2006)Homework5For all the problems assume that the transconductance parameters for nMOS transistor is given by g mn , g dn and for pMOS transistor is given by . mp dp . Assume that the thres
Michigan State University - ECE - 418
ECE 418: Algorithms of Circuit DesignDue Friday (11/03/2006)Homework8In this assignment you will use AC analysis to simulate the response of the following circuits. If you choose you could use other Pspice tools as long as you are using similar
Michigan State University - ECE - 418
ECE 418: Algorithms of Circuit DesignDue Friday (09/15/2006)1)Homework2A large signal model of an nMOS transistor in saturation is given by the following equationI ds = nCoxW (Vgs Vth ) 2 (1 + Vds ) Lgs dsand is shown in Figure 1. Calc
Michigan State University - ME - 471
Impactalso called shock, sudden or impulsive loadingdriving a nail with a hammer, automobile collisions .dashpota) Rapidly moving vehicles crossinga bridgeb) Suddenly applied Combustion inengine cylinderc) Direct Impact pile drive, dr
Michigan State University - ME - 471
Failure TheoriesPredict capability of materials to withstand the infinite combination of non-standard loads Failure: Behavior of a member that renders it unsuitable for its intended function. Static loading (no impact, fatigue nor surface wear)How
Michigan State University - ME - 471
Elastic Strain, Deflection &amp; StabilityStress can not be measured but strain can Strain gage technologySingle-Element (horizontal )Two-Element (horiz. &amp; vertic.)equiangular Three-Element (all directions)rectangularLinearly elastic stress-st
Michigan State University - ME - 471
FatigueTerm fatigue introduced by Poncelet (France) 1839 progressive fracture is more descriptive 1. Minute crack at critical area of high local stress (geometric stress raiser, flaws, preexisting cracks) 2. Crack gradually enlarges (creating &quot;beach
Michigan State University - ME - 471
Elastic DeflectionCastigliano's MethodIf deflection is not covered by simple cases in Table 5.1 (p186)Complementary Energy U'Stored Elastic Energy UIncremental: Deflection:U = U' = Q 2 dU = dU' = dQ = dU dQCastiglino's Theorem: =
Michigan State University - ME - 471
Elastic Instability - BucklingBuckling does not vary linearly with load it occurs suddenly and is therefore dangerousElastically Elastically Stable Unstable 2EI 2EI P &lt; Pcr = 2 P &gt; Pcr = 2 Le Le E .modulus of Elasticity I .moment of inertia (sm
Michigan State University - ME - 471
Machine Components DesignContents30%Homework 2-10% Chapter 2:p41-80Load Analysis Static Stresses DeflectionReviewChapter 4:p113-174Test 5-15% Chapter 5:p175-238Elastic Strain Deflection Stability Failure Theories Safety Factors Reli
Michigan State University - ME - 471
Static Body Stress(Stresses within members and cross sections)Chapter 4Axial Loading=P A13*D3*D2 Concentric Loading 3 Perfect Straight Cylinder 4 No Residual Stresses 5 Stable Equilibrium 6 Homogeneous MaterialStress Concentration
Michigan State University - ME - 471
HomeworkP 8.23Known: D=in, Su = 110ksi, Sy = 77ksi, reversed bending, axial, torsional loading, steel, machined surface Find: Sn(6x104 life cycles)HomeworkP 8.23Known: D=in, Su = 110ksi, Sy = 77ksi, reversed bending, axial, torsional loadin
Michigan State University - ME - 471
Homework 5Solve Problem P4.55 Read Chapter 4.12-4.17Due: Monday 02/14/05Prepare for Test Monday, February 21
Michigan State University - ME - 471
Homework 1name:_ A#:_ME 471
Michigan State University - ME - 471
Constant Speed F=0 , M=0weight: 3000lb speed: 60mph power: 16hp Rear wheel drive No rolling resistance Ground reaction forces?With Acceleration F=m*a , M=I*weight: 3000lb speed: 60mph power: 96hp Rear wheel drive No rolling resistance Rot. inerti
Michigan State University - ME - 471
ExamMonday April 18Chapter 5:5.1-2, 5.5-7, 5.10-12Elastic Strain Deflection Stability Failure Theories Safety Factors Impact FatigueChapter 6:6.1-2, 6.5-8, 6.10-12Chapter 7:7.1-2, 7.4Chapter 8:8.1-11Chapter 5:Elastic Strain 5.1-2,
Michigan State University - ME - 471
ExamMonday April 18Chapter 5:5.1-2, 5.5-7, 5.10-12Elastic Strain Deflection Stability Failure Theories Safety Factors Impact FatigueChapter 6:6.1-2, 6.5-8, 6.10-12Chapter 7:7.1-2, 7.4Chapter 8:8.1-11Chapter 5:Elastic Strain 5.1-2,
Michigan State University - ME - 471
Homework 3ME 471Solve Problems 2.29 + 4.2 + 4.7 &amp; Read Chapter 2.4 - 2.5 Due: next class (Monday 01/31/05)http:/www.egr.msu.edu/classes/me471/thompson
Michigan State University - ME - 471