COVENANT UNIVERSITY NIGERIA TUTORIAL KIT OMEGA SEMESTER PROGRAMME: MECHANICAL ENGINEERING
|
|
- Cecilia Porter
- 5 years ago
- Views:
Transcription
1 COVENANT UNIVERSITY NIGERIA TUTORIAL KIT OMEGA SEMESTER PROGRAMME: MECHANICAL ENGINEERING COURSE: MCE 524
2 DISCLAIMER The contents of this document are intended for practice and leaning purposes at the undergraduate level. The materials are from different sources including the internet and the contributors do not in any way claim authorship or ownership of them. The materials are also not to be used for any commercial purpose. 2
3 MCE 524: Heat Transfer Contributor: Dr.S.O Oyedepo Q1 Calculate the rate of heat loss from a furnace wall per unit area. The wall is constructed from an inner layer of 0.5-cm-thick steel (k = 40 W/m K) and an outer layer of 10-cm zirconium brick (k = 2.5 W/m K) as shown in Fig. Q1. The inner- surface temperature is 900 K and the outside surface temperature is 460 K. What is the temperature at the interface? Fig. Q1: Schematic diagram of furnace wall Q2 The outside surface of a cylindrical cryogenic container is at 10 C. The outside radius is 8 cm. There is a heat flow of 65.5 W/m, which is dissipated to the surroundings both by radiation and convection. The convection coefficient has a value of 4.35 W/m 2 K. The radiation factor F = 1. Determine the surrounding temperature. Q3 In a solar flat plate heater some of the heat is absorbed by a fluid while the remaining heat is lost over the surface by convection the bottom being well insulated. The fraction absorbed is known as the efficiency of the collector. If the flux incident has a value of 800 W/m 2 and if the collection temperature is 60 C while the outside air is at 32 C with a convection coefficient of 15 W/m 2 K, determine the collection efficiency. Also find the collection efficiency if collection temperature is 45 C. Q4 Choose the correct statement in each question. 3
4 (i) A pipe carrying steam at about 300 C traverses a room, the air being still at 30 C. The major fraction of the heat loss will be by (a) conduction to the still air (b) convection to the air (c) radiation to the surroundings (d) conduction and convection put together. (ii)a satellite in space exchanges heat with its surroundings by (a) conduction (b) convection (c) radiation (d) conduction as well as convection. (iii) (iv) For the same temperature drop in the temperature ranges of C the heat flow rate will be highest by (a) conduction process (b) convection process (c) radiation process (d) other factors should be known before any conclusion. In the cold season a person would prefer to be near a fire because (a) the conduction from the fire will be better (b) the convection will be better if he is near the fire (c) direct unimpeded radiation will provide quick warmth (d) combined conduction and convection will be better. (a) A finned tube hot water radiator with a fan blowing air over it is kept in rooms during winter. The major portion of the heat transfer from the radiator to air is due to: (a) radiation (b) convection (c) conduction (d) combined conduction and radiation. (v) For a specified heat input and a given volume which material will have the smallest temperature rise (Use data book if necessary) (a) steel (b) aluminium (c) water (d) copper. Q5 A thin metal sheet receives heat on one side from a fluid at 80 C with a convection coefficient of 100 W/m2K while on the other side it radiates to another metal sheet parallel to it. The second sheet loses heat on its other side by convection to a fluid at 20 C with a convection coefficient of 15 W/m2K. Determine the steady state temperature of the sheets. The two sheets exchange heat only by radiation and may be considered to be black and fairly large in size. Q6 A steel tube having k = 46 W/m C has an inside diameter of 3.0 cm and a tube wall thickness of 2 mm. A fluid flows on the inside of the tube producing a convection coefficient of 1500 W/m 2 C on the inside surface, while a second fluid flows across the outside of the tube producing a convection coefficient of 197 W/m 2 C on the outside tube surface. The inside fluid temperature is 223 C while the outside fluid temperature is 57 C. Calculate the heat lost by the tube per meter of length. Q7 A furnace wall is of three layers, first layer of insulation brick of 12 cm thickness of conductivity 0.6 W/mK. The face is exposed to gases at 870 C with a convection coefficient of 110 W/m 2 K. This layer is backed by a 10 cm layer of firebrick of conductivity 0.8 W/mK. There is a contact resistance between the layers of m 2 C/W. The third layer is the plate backing of 10 mm thickness of conductivity 49 W/mK. The contact resistance between the second and third layers is m2 C/W. The plate is exposed to air at 30 C with a convection coefficient of 15 W/m 2 K. Determine the heat flow, the surface temperatures and the overall heat transfer coefficient. Q8 Steam having a quality of 98% at a pressure of 1.37 X 105 N/m 2 is flowing at a velocity of 1 m/s through a steel pipe of 2.7-cm OD and 2.1-cm ID. The heat transfer coefficient at the inner 4
5 surface, where condensation occurs, is 567 W/m2 K. A dirt film at the inner surface adds a unit thermal resistance of 0.18 m 2 K/W. Estimate the rate of heat loss per meter length of pipe if (a) the pipe is bare, (b) the pipe is covered with a 5-cm layer of 85% magnesia insulation. For both cases assume that the convection heat transfer coefficient at the outer surface is 11 W/m 2 K and that the environmental temperature is 21 C. Also estimate the quality of the steam after a 3-m length of pipe in both cases. Q9 A fin in the form of a ring of 0.25 mm thickness and 15 mm OD and 15 mm long is used on an electric device to dissipate heat. Consider the outer surface alone to be effective and exposed to air at 25 C with a convection coefficient of 40 W/m 2 K. The conductivity of the material is 340 W/mK. If the heat output is 0.25 W and if the device is also of the same OD, determine the device temperature with and without the fin. Q10 A solar collector plate is exposed to a flux of 900 W/m2. Heat is collected by water pipes fixed at 12 cm pitch with a water temperature of 48 C. The plate is 2 mm thick and has a conductivity of 204 W/mK. If the losses over the plate is accounted by a convection coefficient of 15 W/m2K to air at 30 C, determine the maximum temperature in the plate and also the rate of heat collection by the water per pitch width and 1 m length. Q11 For the boundary conditions for the plate shown in Fig. Q11 determine using analytical method the temperature at the midpoint p, under steady two dimensional conduction. (use up to 5 terms in the series summation). Fig. Q11. Problem model Q12 A rectangle 0.5 m 1 m has both the 1 m sides and one 0.5 m side at 200 C. The other side is having a temperature distribution given by T = sin (π x/0.5) where x is in m and T in C. Locate the y values at x = 0.5 m at which the temperatures will be 300, 400, 500 C. Also locate the values of x for y = 1 m at which these temperatures occur. Q13 The temperature distribution and boundary condition in part of a solid is shown in Fig. Q13. Determine the Temperatures at nodes marked A, B and C. Determine the heat convected over surface exposed to convection. k = 1.5 W/mK. 5
6 Fig. Q13. Q14 A part of a solid with temperatures at the nodes and the boundaries are shown in Fig. Q14. Determine the temperature at node A and also the heat flow over the convecting surface. The top surface is exposed to convection at 300 C with h = 10 W/m 2 K. Fig. Q14 Q15 Nitrogen at a pressure of 0.1 atm flows over a flat plate with a free stream velocity of 8 m/s. The temperature of the gas is 20 C. The plate temperature is 20 C. Determine the length for the flow to turn turbulent. Assume as critical Reynolds number. Also determine the thickness of thermal and velocity boundary layers and the average convection coefficient for a plate length of 0.3 m. Properties are to be found at film temperature. Q16 A thin conducting plate separates two parallel air streams. The hot stream is at 200 C and 1 atm pressure. The free stream velocity is 15 m/s. The cold stream is at 20 C and 2 atm pressure and the free stream velocity is 5 m/s. Determine the heat flux at the mid - point of the plate of 1 m length. Q17 Air at 1 atm with a temperature of 500 C flows over a plate 0.2 m long and 0.1 m wide. The Reynolds number is 40,000. (Flow is along the 0.2 m side). Determine the rate of heat transfer from the plate at 100 C to air 50 C. If the velocity of flow is doubled and the pressure is increased to 5 atm, determine the percentage change. The properties of air are read from tables and interpolated for film temperature of 75 C. Q18 6
7 A radioactive sample is to be stored in a protective box with 4-cm-thick walls and interior dimensions of 4 cm X 4 cm X 12 cm. The radiation emitted by the sample is completely absorbed at the inner surface of the box, which is made of concrete. If the outside temperature of the box is 25 C but the inside temperature is not to exceed 50 C, determine the maximum permissible radia- tion rate from the sample, in watts. Q19 A surface with A = 2 cm 2 emits radiation as a blackbody at T= 1000 K. (a) Calculate the radiation emitted into a solid angle subtended by 0 2π and 0 θ π 6 (b) What fraction is the energy emitted into the above solid angle of that emitted into the entire hemispherical space? Q20 Greenhouse effect is nothing but trapping of radiation by letting in radiation of short wavelength and shutting out radiation of long wavelength. A green house has a roof area of 100 m 2 perpendicular to the solar inclination. The material has a transmissivity of 0.9 up to a wavelength of 4 µm and zero beyond. The solar flux has a value of 800 W/m 2. The total wall area is 600 m 2. It the inside is to be maintained at 22 C while the outside is at 5 C, determine the maxi- mum value of overall heat transfer coefficient for heat flow through the walls. The temperature of solar radiation may be taken as 5000 K. MODEL ANSWERS A1 Assumptions Assume that steady state exists, neglect effects at the corners and edges of the wall, and assume that the surface temperatures are uniform. The rate of heat loss per unit area can be calculated from equation given below: 7
8 N.B: The temperature drop across the steel interior wall is only 1.4 K because the thermal resistance of the wall is small compared to the resistance of the brick, across which the temperature drop is many times larger. A3 Solution: The heat lost by convection = Q = ha(t 1 T 2 ) Fig. A3 8
9 A5 The energy balance provides (Fig. A5) heat received convection by Sheet 1 = heat radiation exchange between sheet 1 and 2. = heat convected by sheet 2. 9
10 A7 The data and equivalent circuit are shown in Fig A7. Using equation: Fig. A7. Composite wall. 10
11 Note: The contact drops and drop in the metal plate are very small. The insulation resistances and outside convection are the controlling resistances. A9 The heat is lost from the surface of the device by convection without fin: 11
12 Fig. A9 A11 Using equation: 12
13 A13 Considering A 13
14 A15 Film temperature = ( )/2 = 0 C As density and kinematic viscosities will vary with pressure, dynamic viscosity is read from tables. 14
15 A17 15
16 A19 (a) The radiation energy emitted by an area A streaming through a differential solid angle dω = sinθdθd in any direction is given by 16
Principles of Food and Bioprocess Engineering (FS 231) Problems on Heat Transfer
Principles of Food and Bioprocess Engineering (FS 1) Problems on Heat Transfer 1. What is the thermal conductivity of a material 8 cm thick if the temperature at one end of the product is 0 C and the temperature
More informationS.E. (Chemical) (Second Semester) EXAMINATION, 2012 HEAT TRANSFER (2008 PATTERN) Time : Three Hours Maximum Marks : 100
Total No. of Questions 12] [Total No. of Printed Pages 7 Seat No. [4162]-187 S.E. (Chemical) (Second Semester) EXAMINATION, 2012 HEAT TRANSFER (2008 PATTERN) Time : Three Hours Maximum Marks : 100 N.B.
More informationS.E. (Chemical) (Second Semester) EXAMINATION, 2011 HEAT TRANSFER (2008 PATTERN) Time : Three Hours Maximum Marks : 100
Total No. of Questions 12] [Total No. of Printed Pages 7 [4062]-186 S.E. (Chemical) (Second Semester) EXAMINATION, 2011 HEAT TRANSFER (2008 PATTERN) Time : Three Hours Maximum Marks : 100 N.B. : (i) Answers
More informationIntroduction to Heat Transfer
Question Bank CH302 Heat Transfer Operations Introduction to Heat Transfer Question No. 1. The essential condition for the transfer of heat from one body to another (a) Both bodies must be in physical
More informationExamination Heat Transfer
Examination Heat Transfer code: 4B680 date: 17 january 2006 time: 14.00-17.00 hours NOTE: There are 4 questions in total. The first one consists of independent sub-questions. If necessary, guide numbers
More informationIf there is convective heat transfer from outer surface to fluid maintained at T W.
Heat Transfer 1. What are the different modes of heat transfer? Explain with examples. 2. State Fourier s Law of heat conduction? Write some of their applications. 3. State the effect of variation of temperature
More informationThermal Unit Operation (ChEg3113)
Thermal Unit Operation (ChEg3113) Lecture 3- Examples on problems having different heat transfer modes Instructor: Mr. Tedla Yeshitila (M.Sc.) Today Review Examples Multimode heat transfer Heat exchanger
More informationTrue/False. Circle the correct answer. (1pt each, 7pts total) 3. Radiation doesn t occur in materials that are transparent such as gases.
ME 323 Sample Final Exam. 120pts total True/False. Circle the correct answer. (1pt each, 7pts total) 1. A solid angle of 2π steradians defines a hemispherical shell. T F 2. The Earth irradiates the Sun.
More informationHeat and Mass Transfer Unit-1 Conduction
1. State Fourier s Law of conduction. Heat and Mass Transfer Unit-1 Conduction Part-A The rate of heat conduction is proportional to the area measured normal to the direction of heat flow and to the temperature
More informationC ONTENTS CHAPTER TWO HEAT CONDUCTION EQUATION 61 CHAPTER ONE BASICS OF HEAT TRANSFER 1 CHAPTER THREE STEADY HEAT CONDUCTION 127
C ONTENTS Preface xviii Nomenclature xxvi CHAPTER ONE BASICS OF HEAT TRANSFER 1 1-1 Thermodynamics and Heat Transfer 2 Application Areas of Heat Transfer 3 Historical Background 3 1-2 Engineering Heat
More informationEng Heat Transfer I 1
Eng6901 - Heat Transfer I 1 1 Thermal Resistance 1. A square silicon chip (k = 150 W/m K) is of width w = 5 mm on a side and thickness t = 1 mm. The chip is mounted in a substrate such that its sides and
More informationHEAT TRANSFER 1 INTRODUCTION AND BASIC CONCEPTS 5 2 CONDUCTION
HEAT TRANSFER 1 INTRODUCTION AND BASIC CONCEPTS 5 2 CONDUCTION 11 Fourier s Law of Heat Conduction, General Conduction Equation Based on Cartesian Coordinates, Heat Transfer Through a Wall, Composite Wall
More informationSHRI RAMSWAROOP MEMORIAL COLLEGE OF ENGG. & MANAGEMENT B.Tech. [SEM V (ME-51, 52, 53, 54)] QUIZ TEST-1 (Session: )
QUIZ TEST-1 Time: 1 Hour HEAT AND MASS TRANSFER Note: All questions are compulsory. Q1) The inside temperature of a furnace wall ( k=1.35w/m.k), 200mm thick, is 1400 0 C. The heat transfer coefficient
More informationCOVENANT UNIVERSITY NIGERIA TUTORIAL KIT OMEGA SEMESTER PROGRAMME: MECHANICAL ENGINEERING
COVENANT UNIVERSITY NIGERIA TUTORIAL KIT OMEGA SEMESTER PROGRAMME: MECHANICAL ENGINEERING COURSE: GEC 223 DISCLAIMER The contents of this document are intended for practice and leaning purposes at the
More informationECE309 INTRODUCTION TO THERMODYNAMICS & HEAT TRANSFER. 10 August 2005
ECE309 INTRODUCTION TO THERMODYNAMICS & HEAT TRANSFER 0 August 2005 Final Examination R. Culham & M. Bahrami This is a 2 - /2 hour, closed-book examination. You are permitted to use one 8.5 in. in. crib
More informationApplied Thermodynamics HEAT TRANSFER. Introduction What and How?
LANDMARK UNIVERSITY, OMU-ARAN LECTURE NOTE: 3 COLLEGE: COLLEGE OF SCIENCE AND ENGINEERING DEPARTMENT: MECHANICAL ENGINEERING PROGRAMME: ENGR. ALIYU, S.J Course code: MCE 311 Course title: Applied Thermodynamics
More informationUniversity of New Mexico Mechanical Engineering Spring 2012 PhD qualifying examination Heat Transfer
University of New Mexico Mechanical Engineering Spring 2012 PhD qualifying examination Heat Transfer Closed book. Formula sheet and calculator are allowed, but not cell phones, computers or any other wireless
More informationTOPIC 2 [A] STEADY STATE HEAT CONDUCTION
TOPIC 2 [A] STEADY STATE HEAT CONDUCTION CLASS TUTORIAL 1. The walls of a refrigerated truck consist of 1.2 mm thick steel sheet (k=18 W/m-K) at the outer surface, 22 mm thick cork (k=0.04 W/m-K) on the
More informationExperiment 1. Measurement of Thermal Conductivity of a Metal (Brass) Bar
Experiment 1 Measurement of Thermal Conductivity of a Metal (Brass) Bar Introduction: Thermal conductivity is a measure of the ability of a substance to conduct heat, determined by the rate of heat flow
More informationFatima
Fatima QUESTION BANK DEPARTMENT: MECH SEMESTER: IV SUBJECT CODE / Name: ME 2251/HEAT AND MASS TRANSFER UNIT I: CONDUCTION PART -A (2 Marks) 1. What is Fourier's Law of heat conduction? (May 05, May 06,
More informationSolar Flat Plate Thermal Collector
Solar Flat Plate Thermal Collector INTRODUCTION: Solar heater is one of the simplest and basic technologies in the solar energy field. Collector is the heart of any solar heating system. It absorbs and
More informationPHYS102 Previous Exam Problems. Temperature, Heat & The First Law of Thermodynamics
PHYS102 Previous Exam Problems CHAPTER 18 Temperature, Heat & The First Law of Thermodynamics Equilibrium & temperature scales Thermal expansion Exchange of heat First law of thermodynamics Heat conduction
More informationDepartment of Energy Science & Engineering, IIT Bombay, Mumbai, India. *Corresponding author: Tel: ,
ICAER 2011 AN EXPERIMENTAL AND COMPUTATIONAL INVESTIGATION OF HEAT LOSSES FROM THE CAVITY RECEIVER USED IN LINEAR FRESNEL REFLECTOR SOLAR THERMAL SYSTEM Sudhansu S. Sahoo* a, Shinu M. Varghese b, Ashwin
More informationDEPARTMENT OF MECHANICAL ENGINEERING. ME 6502 Heat and Mass Transfer III YEAR-V SEMESTER
ME650 HEAT AND MASS TRNSFER MARKS & 16 MARKS QUESTION AND ANSWER ME 650 Heat and Mass Transfer III YEAR-V SEMESTER NAME :. REG.NO :. BRANCH :... YEAR & SEM :. 1 ME650 HEAT AND MASS TRNSFER MARKS & 16 MARKS
More informationThermal conversion of solar radiation. c =
Thermal conversion of solar radiation The conversion of solar radiation into thermal energy happens in nature by absorption in earth surface, planetary ocean and vegetation Solar collectors are utilized
More informationLatest Heat Transfer
Latest Heat Transfer 1. Unit of thermal conductivity in M.K.S. units is (a) kcal/kg m2 C (b) kcal-m/hr m2 C (c) kcal/hr m2 C (d) kcal-m/hr C (e) kcal-m/m2 C. 2. Unit of thermal conductivity in S.I. units
More information1. How much heat was needed to raise the bullet to its final temperature?
Name: Date: Use the following to answer question 1: A 0.0500-kg lead bullet of volume 5.00 10 6 m 3 at 20.0 C hits a block that is made of an ideal thermal insulator and comes to rest at its center. At
More informationTutorial 1. Where Nu=(hl/k); Reynolds number Re=(Vlρ/µ) and Prandtl number Pr=(µCp/k)
Tutorial 1 1. Explain in detail the mechanism of forced convection. Show by dimensional analysis (Rayleigh method) that data for forced convection may be correlated by an equation of the form Nu = φ (Re,
More informationArctice Engineering Module 3a Page 1 of 32
Welcome back to the second part of the second learning module for Fundamentals of Arctic Engineering online. We re going to review in this module the fundamental principles of heat transfer. Exchange of
More informationPHYSICAL MECHANISM OF CONVECTION
Tue 8:54:24 AM Slide Nr. 0 of 33 Slides PHYSICAL MECHANISM OF CONVECTION Heat transfer through a fluid is by convection in the presence of bulk fluid motion and by conduction in the absence of it. Chapter
More informationLECTURE NOTES. Heat Transfer. III B. Tech II Semester (JNTUA-R15) CHADALAWADA RAMANAMMA ENGINEERING COLLEGE (AUTONOMOUS)
LECTURE NOTES on Heat Transfer III B. Tech II Semester (JNTUA-R15) Mr. K.SURESH, Assistant Professor CHADALAWADA RAMANAMMA ENGINEERING COLLEGE (AUTONOMOUS) Chadalawada Nagar, Renigunta Road, Tirupati 517
More informationCHAPTER 7 NUMERICAL MODELLING OF A SPIRAL HEAT EXCHANGER USING CFD TECHNIQUE
CHAPTER 7 NUMERICAL MODELLING OF A SPIRAL HEAT EXCHANGER USING CFD TECHNIQUE In this chapter, the governing equations for the proposed numerical model with discretisation methods are presented. Spiral
More informationReview: Conduction. Breaking News
CH EN 3453 Heat Transfer Review: Conduction Breaking News No more homework (yay!) Final project reports due today by 8:00 PM Email PDF version to report@chen3453.com Review grading rubric on Project page
More informationCHAPTER 5 CONVECTIVE HEAT TRANSFER COEFFICIENT
62 CHAPTER 5 CONVECTIVE HEAT TRANSFER COEFFICIENT 5.1 INTRODUCTION The primary objective of this work is to investigate the convective heat transfer characteristics of silver/water nanofluid. In order
More informationCoolant. Circuits Chip
1) A square isothermal chip is of width w=5 mm on a side and is mounted in a subtrate such that its side and back surfaces are well insulated, while the front surface is exposed to the flow of a coolant
More informationELEC9712 High Voltage Systems. 1.2 Heat transfer from electrical equipment
ELEC9712 High Voltage Systems 1.2 Heat transfer from electrical equipment The basic equation governing heat transfer in an item of electrical equipment is the following incremental balance equation, with
More informationLevel 7 Post Graduate Diploma in Engineering Heat and mass transfer
9210-221 Level 7 Post Graduate Diploma in Engineering Heat and mass transfer 0 You should have the following for this examination one answer book non programmable calculator pen, pencil, drawing instruments
More informationLaw of Heat Transfer
Law of Heat Transfer The Fundamental Laws which are used in broad area of applications are: 1. The law of conversion of mass 2. Newton s second law of motion 3. First and second laws of thermodynamics
More informationChapter 11. Energy in Thermal Processes
Chapter 11 Energy in Thermal Processes Energy Transfer When two objects of different temperatures are placed in thermal contact, the temperature of the warmer decreases and the temperature of the cooler
More informationPROBLEM 1.2 ( ) 25 C 15 C dx L 0.30 m Ambient air temperature, T2 (C)
PROBLEM 1.2 KNOWN: Inner surface temperature and thermal conductivity of a concrete wall. FIND: Heat loss by conduction through the wall as a function of ambient air temperatures ranging from -15 to 38
More informationHeriot-Watt University
Heriot-Watt University Distinctly Global www.hw.ac.uk Thermodynamics By Peter Cumber Prerequisites Interest in thermodynamics Some ability in calculus (multiple integrals) Good understanding of conduction
More informationUNIT FOUR SOLAR COLLECTORS
ME 476 Solar Energy UNIT FOUR SOLAR COLLECTORS Flat Plate Collectors Outline 2 What are flat plate collectors? Types of flat plate collectors Applications of flat plate collectors Materials of construction
More information( ) PROBLEM C 10 C 1 L m 1 50 C m K W. , the inner surface temperature is. 30 W m K
PROBLEM 3. KNOWN: Temperatures and convection coefficients associated with air at the inner and outer surfaces of a rear window. FIND: (a) Inner and outer window surface temperatures, T s,i and T s,o,
More informationPH2200 Practice Final Exam Summer 2003
INSTRUCTIONS 1. Write your name and student identification number on the answer sheet. 2. Please cover your answer sheet at all times. 3. This is a closed book exam. You may use the PH2200 formula sheet
More informationLecture 28. Key words: Heat transfer, conduction, convection, radiation, furnace, heat transfer coefficient
Lecture 28 Contents Heat transfer importance Conduction Convection Free Convection Forced convection Radiation Radiation coefficient Illustration on heat transfer coefficient 1 Illustration on heat transfer
More informationPrinciples of Food and Bioprocess Engineering (FS 231) Exam 2 Part A -- Closed Book (50 points)
Principles of Food and Bioprocess Engineering (FS 231) Exam 2 Part A -- Closed Book (50 points) 1. Are the following statements true or false? (20 points) a. Thermal conductivity of a substance is a measure
More informationIntroduction to Heat and Mass Transfer
Introduction to Heat and Mass Transfer Week 16 Merry X mas! Happy New Year 2019! Final Exam When? Thursday, January 10th What time? 3:10-5 pm Where? 91203 What? Lecture materials from Week 1 to 16 (before
More informationChapter 3 NATURAL CONVECTION
Fundamentals of Thermal-Fluid Sciences, 3rd Edition Yunus A. Cengel, Robert H. Turner, John M. Cimbala McGraw-Hill, 2008 Chapter 3 NATURAL CONVECTION Mehmet Kanoglu Copyright The McGraw-Hill Companies,
More informationFINAL Examination Paper (COVER PAGE) Programme : BACHELOR OF ENGINEERING (HONS) IN MECHANICAL ENGINEERING PROGRAMME (BMEGI)
MEE0 (F) / Page of Session : August 0 FINA Examination Paper (COVER PAGE) Programme : BACHEOR OF ENGINEERING (HONS) IN MECHANICA ENGINEERING PROGRAMME (BMEGI) Course : MEE0 : Combustion, Heat and Mass
More informationChapter 1 INTRODUCTION AND BASIC CONCEPTS
Heat and Mass Transfer: Fundamentals & Applications 5th Edition in SI Units Yunus A. Çengel, Afshin J. Ghajar McGraw-Hill, 2015 Chapter 1 INTRODUCTION AND BASIC CONCEPTS Mehmet Kanoglu University of Gaziantep
More informationHEAT TRANSFER THERMAL MANAGEMENT OF ELECTRONICS YOUNES SHABANY. C\ CRC Press W / Taylor Si Francis Group Boca Raton London New York
HEAT TRANSFER THERMAL MANAGEMENT OF ELECTRONICS YOUNES SHABANY C\ CRC Press W / Taylor Si Francis Group Boca Raton London New York CRC Press is an imprint of the Taylor & Francis Group, an informa business
More informationHeat Transfer: Physical Origins and Rate Equations. Chapter One Sections 1.1 and 1.2
Heat Transfer: Physical Origins and Rate Equations Chapter One Sections 1.1 and 1. Heat Transfer and Thermal Energy What is heat transfer? Heat transfer is thermal energy in transit due to a temperature
More information11. Advanced Radiation
. Advanced adiation. Gray Surfaces The gray surface is a medium whose monochromatic emissivity ( λ does not vary with wavelength. The monochromatic emissivity is defined as the ratio of the monochromatic
More informationIntroduction to Heat and Mass Transfer. Week 5
Introduction to Heat and Mass Transfer Week 5 Critical Resistance Thermal resistances due to conduction and convection in radial systems behave differently Depending on application, we want to either maximize
More informationHEAT TRANSFER. PHI Learning PfcO too1. Principles and Applications BINAY K. DUTTA. Delhi Kolkata. West Bengal Pollution Control Board
HEAT TRANSFER Principles and Applications BINAY K. DUTTA West Bengal Pollution Control Board Kolkata PHI Learning PfcO too1 Delhi-110092 2014 Contents Preface Notations ix xiii 1. Introduction 1-8 1.1
More informationTopic 5 Practice Test
Base your answers to questions 1 and 2 on the diagram below, which represents the greenhouse effect in which heat energy is trapped in Earth's atmosphere 1. The Earth surface that best absorbs short-wave
More informationReading Problems , 15-33, 15-49, 15-50, 15-77, 15-79, 15-86, ,
Radiation Heat Transfer Reading Problems 15-1 15-7 15-27, 15-33, 15-49, 15-50, 15-77, 15-79, 15-86, 15-106, 15-107 Introduction The following figure shows the relatively narrow band occupied by thermal
More informationPROBLEM 1.3. dt T1 T dx L 0.30 m
PROBLEM 1.3 KNOWN: Inner surface temperature and thermal conductivity of a concrete wall. FIND: Heat loss by conduction through the wall as a function of outer surface temperatures ranging from -15 to
More informationHeat Tracing Basics. By: Homi R. Mullan 1
Heat Tracing Basics By: Homi R. Mullan 1 Heat Tracing Basics Topics of Discussion What is Heat Tracing? Why Heat Tracing? Fundamentals of Heat Loss and Heat Replenishment Rules to Remember in the Heat
More informationMinistry of Higher Education And Scientific Research. University Of Technology Chemical Engineering Department. Heat Transfer
Ministry of Higher Education And Scientific Research University Of Technology Heat Transfer Third Year By Dr.Jamal Al-Rubeai 2008-2009 Heat Transfer 1. Modes of Heat Transfer: Conduction, Convection and
More informationPhone: , For Educational Use. SOFTbank E-Book Center, Tehran. Fundamentals of Heat Transfer. René Reyes Mazzoco
8 Fundamentals of Heat Transfer René Reyes Mazzoco Universidad de las Américas Puebla, Cholula, Mexico 1 HEAT TRANSFER MECHANISMS 1.1 Conduction Conduction heat transfer is explained through the molecular
More informationCountercurrent heat exchanger
Countercurrent heat exchanger 1. Theoretical summary The basic operating principles and the simplified calculations regarding the counter current heat exchanger were discussed in the subject Chemical Unit
More informationPAPER 2 THEORY QUESTIONS
PAPER 2 THEORY QUESTIONS 1 Fig. 1.1 shows the arrangement of atoms in a solid block. Fig. 1.1 (a) End X of the block is heated. Energy is conducted to end Y, which becomes warm. (i) Explain how heat is
More informationME 315 Final Examination Solution 8:00-10:00 AM Friday, May 8, 2009 CIRCLE YOUR DIVISION
ME 315 Final Examination Solution 8:00-10:00 AM Friday, May 8, 009 This is a closed-book, closed-notes examination. There is a formula sheet at the back. You must turn off all communications devices before
More informationChapter 3: Steady Heat Conduction. Dr Ali Jawarneh Department of Mechanical Engineering Hashemite University
Chapter 3: Steady Heat Conduction Dr Ali Jawarneh Department of Mechanical Engineering Hashemite University Objectives When you finish studying this chapter, you should be able to: Understand the concept
More informationMECHANISM BEHIND FREE /NATURAL CONVECTION
CONVECTIVE HEAT TRANSFER By: Prof K. M. Joshi, Assi. Professor, MED, SSAS Institute of Technology, Surat. MECHANISM BEHIND FREE /NATURAL CONVECTION The stagnate layer of fluid in immediate vicinity of
More informationAutumn 2005 THERMODYNAMICS. Time: 3 Hours
CORK INSTITUTE OF TECHNOOGY Bachelor of Engineering (Honours) in Mechanical Engineering Stage 3 (Bachelor of Engineering in Mechanical Engineering Stage 3) (NFQ evel 8) Autumn 2005 THERMODYNAMICS Time:
More informationChapter 11 FUNDAMENTALS OF THERMAL RADIATION
Chapter Chapter Fundamentals of Thermal Radiation FUNDAMENTALS OF THERMAL RADIATION Electromagnetic and Thermal Radiation -C Electromagnetic waves are caused by accelerated charges or changing electric
More informationDR.PRADIP DUTTA Department of Mechanical Engineering Indian Institute of Science Bangalore
DR.PRADIP DUTTA Department of Mechanical Engineering Indian Institute of Science Bangalore What is Heat Transfer? Energy in transit due to temperature difference. Thermodynamics tells us: How much heat
More informationHEAT AND MASS TRANSFER. List of Experiments:
HEAT AND MASS TRANSFER List of Experiments: Conduction Heat Transfer Unit 1. Investigation of Fourier Law for linear conduction of heat along a simple bar. 2. Study the conduction of heat along a composite
More informationChapter 2 HEAT CONDUCTION EQUATION
Heat and Mass Transfer: Fundamentals & Applications Fourth Edition Yunus A. Cengel, Afshin J. Ghajar McGraw-Hill, 2011 Chapter 2 HEAT CONDUCTION EQUATION Mehmet Kanoglu University of Gaziantep Copyright
More informationAn Evacuated PV/Thermal Hybrid Collector with the Tube/XCPC design
An Evacuated PV/Thermal Hybrid Collector with the Tube/XCPC design Lun Jiang Chuanjin Lan Yong Sin Kim Yanbao Ma Roland Winston University of California, Merced 4200 N.Lake Rd, Merced CA 95348 ljiang2@ucmerced.edu
More informationTHE EFFECTS OF CALORIMETER TILT ON THE INWARD-FLOWING FRACTION OF ABSORBED SOLAR RADIATION IN A VENETIAN BLIND
Collins, M.R., and Harrison, S.J., "The Effects of Calorimeter Tilt on the Inward-Flowing Fraction of Absorbed Solar Radiation in a Venetian Blind", ASHRAE Transactions, Vol. 107 (1), pp. 677-683, 2001.
More informationChapter 1: 20, 23, 35, 41, 68, 71, 76, 77, 80, 85, 90, 101, 103 and 104.
Chapter 1: 0, 3, 35, 1, 68, 71, 76, 77, 80, 85, 90, 101, 103 and 10. 1-0 The filament of a 150 W incandescent lamp is 5 cm long and has a diameter of 0.5 mm. The heat flux on the surface of the filament,
More informationPROBLEM L. (3) Noting that since the aperture emits diffusely, I e = E/π (see Eq ), and hence
PROBLEM 1.004 KNOWN: Furnace with prescribed aperture and emissive power. FIND: (a) Position of gauge such that irradiation is G = 1000 W/m, (b) Irradiation when gauge is tilted θ d = 0 o, and (c) Compute
More informationExam questions: HEAT. 2. [2003 OL][2004 OL][2005 OL][2006 OL][2007 OL][2008 OL][2009] Name two methods by which heat can be transferred.
Exam questions: HEAT Specific heat capacity of copper = 390 J kg 1 K 1 ; Specific heat capacity of water = 4200 J kg 1 K 1 s.h.c. of aluminium = 910 J kg -1 K -1 ; Specific latent heat of fusion of ice
More informationUNIVERSITY OF WATERLOO. ECE 309 Thermodynamics and Heat Transfer. Final Examination Spring 1997
UNIVERSITY OF WATERLOO DEPARTMENT OF ELECTRICAL ENGINEERING ECE 309 Thermodynamics and Heat Transfer Final Examination Spring 1997 M.M. Yovanovich August 5, 1997 9:00 A.M.-12:00 Noon NOTE: 1. Open book
More information1/54 Circulation pump, safety valve, expansion vessel
1/54 Circulation pump, safety valve, expansion vessel pressure loss efficiency of pump secured heat output safety valve sizing expansion vessel sizing Circulation pump 2/54 similar principle as for heating
More informationChapter 11. Energy in Thermal Processes
Chapter 11 Energy in Thermal Processes Vocabulary, 3 Kinds of Energy Internal Energy U = Energy of microscopic motion and intermolucular forces Work W = -F x = -P V is work done by compression (next chapter)
More informationChapter 7: External Forced Convection. Dr Ali Jawarneh Department of Mechanical Engineering Hashemite University
Chapter 7: External Forced Convection Dr Ali Jawarneh Department of Mechanical Engineering Hashemite University Objectives When you finish studying this chapter, you should be able to: Distinguish between
More informationUniversity of Rome Tor Vergata
University of Rome Tor Vergata Faculty of Engineering Department of Industrial Engineering THERMODYNAMIC AND HEAT TRANSFER HEAT TRANSFER dr. G. Bovesecchi gianluigi.bovesecchi@gmail.com 06-7259-727 (7249)
More informationLECUTRE 31:Refractory and gas radiation
LECUTRE 31:Refractory and gas radiation Key words: Radiation, View factor, Gas radiation, Convection Thermal role of refractory surface: Refractory surfaces play an important role in keeping the furnace
More informationPHYSICAL MECHANISM OF NATURAL CONVECTION
1 NATURAL CONVECTION In this chapter, we consider natural convection, where any fluid motion occurs by natural means such as buoyancy. The fluid motion in forced convection is quite noticeable, since a
More informationCPO Science Foundations of Physics. Unit 8, Chapter 26
CPO Science Foundations of Physics Unit 8, Chapter 26 Unit 8: Matter and Energy Chapter 26 Heat Transfer 26.1 Heat Conduction 26.2 Convection 26.3 Radiation Chapter 26 Objectives 1. Explain the relationship
More informationChapter 1. Introduction. Introduction to Heat Transfer
Chapter 1 Introduction to Heat Transfer Islamic Azad University Karaj Branch Dr. M. Khosravy 1 Introduction Thermodynamics: Energy can be transferred between a system and its surroundgs. A system teracts
More informationChapter 2 STEADY STATE CONDUCTION
Principles of Heat Transfer 8th Edition Kreith SOLUTIONS MANUAL Full clear download (no formatting errors) at: https://testbankreal.com/download/principles-heat-transfer-8th-edition-kreithsolutions-manual/
More informationWrite Down Your NAME. Circle Your DIVISION. Div. 1 Div. 2 Div. 3 Div.4 8:30 am 9:30 pm 12:30 pm 3:30 pm Han Xu Ruan Pan
Write Down Your NAME, Last First Circle Your DIVISION Div. 1 Div. 2 Div. 3 Div.4 8:30 am 9:30 pm 12:30 pm 3:30 pm Han Xu Ruan Pan ME315 Heat and Mass Transfer School of Mechanical Engineering Purdue University
More informationHot Runner Technology
Peter Unger Hot Runner Technology Sample Chapter : Basic Aspects of Heat Technology ISBNs 978--56990-395-7-56990-395-6 HANSER Hanser Publishers, Munich Hanser Publications, Cincinnati 9 Basic Aspects of
More informationHeat and Mass Transfer Prof. S. P. Sukhatme Department of Mechanical Engineering Indian Institute of Technology, Bombay Lecture No.
Heat and Mass Transfer Prof. S. P. Sukhatme Department of Mechanical Engineering Indian Institute of Technology, Bombay Lecture No. 01 Namaste. My name is S P Sukhatme and along with my colleague professor
More informationTankExampleNov2016. Table of contents. Layout
Table of contents Task... 2 Calculation of heat loss of storage tanks... 3 Properties ambient air Properties of air... 7 Heat transfer outside, roof Heat transfer in flow past a plane wall... 8 Properties
More information!U = Q " P!V. Q = mc!t. Vocabulary, 3 Kinds of Energy. Chapter 11. Energy in Thermal Processes. Example Temperature and Specific Heat
Vocabulary, 3 Kinds of Energy Chapter 11 Energy in Thermal Processes Internal Energy U = Energy of microscopic motion and intermolucular forces Work W = -F!x = -P!V is work done by compression (next chapter)
More informationReal Temperature Distribution on the Surface of Underfloor Heating
Real Temperature Distribution on the Surface of Underfloor Heating Henryk G. Sabiniak *1, Karolina Wiśnik 2 1, 2 Institute of Environmental Engineering and Building Installations, Technical University
More informationPROBLEM (a) Long duct (L): By inspection, F12. By reciprocity, (b) Small sphere, A 1, under concentric hemisphere, A 2, where A 2 = 2A
PROBLEM 3. KNON: Various geometric shapes involving two areas and. FIND: Shape factors, F and F, for each configuration. SSUMPTIONS: Surfaces are diffuse. NLYSIS: The analysis is not to make use of tables
More informationDemonstrate understanding of aspects of heat
Demonstrate understanding of aspects of heat Heat Transfer Temperature - temperature is a measure of the average kinetic energy of the particles making up an object (measured in C or K) 0 K = -273 o C
More information1. Nusselt number and Biot number are computed in a similar manner (=hd/k). What are the differences between them? When and why are each of them used?
1. Nusselt number and Biot number are computed in a similar manner (=hd/k). What are the differences between them? When and why are each of them used?. During unsteady state heat transfer, can the temperature
More informationMechanisms of heat transfer
Lecture 4 Mechanisms of heat transfer Pre-reading: 17.7 Review Heat can be transferred from one object to another due to a temperature difference. The properties of many objects change with temperature:
More informationHEAT TRANSFER. Mechanisms of Heat Transfer: (1) Conduction
HEAT TRANSFER Mechanisms of Heat Transfer: (1) Conduction where Q is the amount of heat, Btu, transferred in time t, h k is the thermal conductivity, Btu/[h ft 2 ( o F/ft)] A is the area of heat transfer
More informationChapter 2 HEAT CONDUCTION EQUATION
Heat and Mass Transfer: Fundamentals & Applications 5th Edition in SI Units Yunus A. Çengel, Afshin J. Ghajar McGraw-Hill, 2015 Chapter 2 HEAT CONDUCTION EQUATION Mehmet Kanoglu University of Gaziantep
More informationIntroduction to Blackbody Sources
Introduction to s This section contains dedicated blackbody sources for low uncertainty calibration of infrared thermometers. A range of portable primary blackbody sources combine high emissivity with
More information3.0 FINITE ELEMENT MODEL
3.0 FINITE ELEMENT MODEL In Chapter 2, the development of the analytical model established the need to quantify the effect of the thermal exchange with the dome in terms of a single parameter, T d. In
More information