ChE 3A04 Heat Transfer Assignment 1
Posted: Friday September 12
Due: Tuesday September 23, in class
Note: Assignments may be submitted in groups of up to 3 students provided that all
students sign a declaration on the final page of the assignment stating

CHAPTER 7:
EXTERNAL CONVECTION
In external convection, boundary
layers will always form freely since
there is no adjacent surface to restrict
boundary layer development
! there is always fluid outside the
boundary layer where the velocity
and temperature

CHAPTER 5:
TRANSIENT CONDUCTION
In practical terms, very few processes
operate at a true steady-state.
Variations in operation may arise from
noise caused by controller accuracy
and/or mechanical variation inherent
to the different pieces of equipment
th

CHAPTER 11:
HEAT EXCHANGERS
Heat exchangers are one of the most
common unit operations used in
industry and are used to transfer heat
between two fluids for the purpose of:
Recovering thermal energy
Transferring heat to a closed-loop
process
Maintaini

CHAPTER 3: STEADY STATE
1-D CONDUCTION
We already mentioned the parallels
between heat flow and electrical
current flow and the idea of k and h
being measures of the resistance to
heat transfer through a medium
For electricity, resistance is related to
t

CHAPTER 8:
INTERNAL CONVECTION
In internal convection, boundary
layer development may be restricted
by the diameter of the pipe or conduit
within which the fluid flows
! Possible that u is never reached
External convection:
u
u
u
Laminar or turbulent?
In

CHAPTER 6: INTRODUCTION
TO CONVECTION
For conduction through solids, we
derived the general heat diffusion
equation based on all the mechanisms
by which heat can be transferred or
generated in a solid control volume:
qz+dz
qy+dy
qx
qx+dx
qy
qz
T T T
T

CHAPTER 2 CONDUCTION
Consider a wall where the surface
temperatures are such that T1>T2
T1
qx = flow rate of
heat in the x
direction (vector!)
[units of Watts]
L
T2
qx
qx is dependent on
THREE factors:
1. A - surface area perpendicular
to the flow of hea

CHAPTER 4: STEADY STATE,
2-D CONDUCTION
For many heat transfer problems
engineers must solve, the effect of the
objects ends, corners, etc. can be
neglected without significant error
(semi-infinite assumption).
A 2D or 3D problem becomes 1D
However, other

WHAT IS HEAT TRANSFER?
! There are three principal laws
upon which engineering studies are
derived:
" Conservation of Mass
(Mass Transfer, Reactor
Design)
" Conservation of
Momentum (Fluid
Mechanics, Mass Transfer)
" Conservation of Energy
(Thermodynamic

ChE 3A04 Heat Transfer 2015 Assignment 3
Posted: Monday October 5
Due: Tuesday, October 20, in lecture
Note: Assignments may be submitted in groups of up to 3 students provided that all students sign a
declaration on the final page ofthe assignment stat

ChE 3A04 Heat Transfer 2015 Assignment 1 - Solutions
1) An industrial drying kiln with wails 4 cm thick and thermal conductivity 0.25 W/mK is operated with its interior wall at
60°C and its exterior wail at 30°C. The surrounding air is at 25°C, while the

ChE 3A04 Heat Transfer 2015 Assignment 2
Posted: Friday, September 25
Due: Friday October 2, in lectu re
Note: Assignments may be submitted in groups of up to 3 students provided that all students sign a
declaration on the final page of the assignment s

ChE 3A04 Heat Transfer 2015 Assignment 1
Distributed: Sunday, September 13
Due: Tuesday September 24, in lecture
Note: Assignments may be submitted in groups of up to 3 students provided that all students sign a
declaration on the final page of the assign

ChE 3A04 Heat Transfer 2015 Assignment 2
Posted: Friday, September 25
Due: Friday October 2, in lecture
Note: Assignments may be submitted in groups of up to 3 students provided that all students sign a
declaration on the final page of the assignment stat

ChE 3A04 Heat Transfer Assignment 3
Posted: Wednesday October 8
Due: Wednesday October 15, in class.
Note: Assignments may be submitted in groups of up to 3 students provided that all
students sign a declaration on the final page of the assignment stating

352%/(0 $66(660(17
T T T
T
+ k
k
+ k
+ q = c p
x x y y z z
t
WKH UHVXOW ZLOO EH 7[\]W 7 SURILOH
$6. <2856(/)
T
=0
t
6WHDG\ 6WDWH"
1R +HDW *HQHUDWLRQ" q = 0
T
=0
' +HDW )ORZ" z
T T
,
=0
' +HDW )ORZ" y z
T
2T
k
=k 2
N FRQVWDQW" x x
x
7KHQ VROYH

PROBLEM 4.25
KNOWN: Dimensions and temperature of thermocouple bead and wires. Manipulator temperature,
distance between bead and surface.
FIND: Surface temperature.
SCHEMATIC:
Manipulator, T," = 23C
d: 25pm "; l= Air
= 120 um Thermocouple
Tm = 29C be

ChE 3A04 Heat Transfer Assignment 5
Posted: Wednesday, October 29;
Due: Friday, November 7 (in class).
Note: Assignments may be submitted in groups of up to 3 students provided that all students sign a
declaration on the final page of the assignment stati

SOLVING HEAT TRANSFER
PROBLEMS
Engineering calculations require more
work prior to starting your solution to
ensure you understand the scope and
geometry of the problem and simplify
the problem as much as reasonably
possible to make it solvable.
Step 1: L

ChE 3A04 Heat Transfer Assignment 4
Posted: Thursday October 16;
Due: Friday October 24, in class.
Note: Assignments may be submitted in groups of up to 3 students provided that all
students sign a declaration on the final page of the assignment stating t

ChE 3A04 Heat Transfer Assignment 6
Posted: Friday November 7;
Due: Friday November 14, in class.
Note: Assignments may be submitted in groups of up to 3 students provided that all students sign a
declaration on the final page of the assignment stating th

CHEMICAL ENGINEERING 3A04 TEST 2
Duration: 2 hours
McMaster University
Dr. Todd Hoare
October 29, 2014
1. This test includes 4 problems on 2 pages (100 marks). You should ensure your paper is

CHEMICAL ENGINEERING 3A04 TEST 3
Duration: 2 hours
McMaster University
Dr. Todd Hoare
November 19, 2014
1. This test includes 3 problems on 2 pages (100 marks). You should ensure your paper i

ChE 3A04 Heat Transfer Assignment 2
Posted: Tuesday September 23
Due: Tuesday September 30, in class.
Note: Assignments may be submitted in groups of up to 3 students provided that all
students sign a declaration on the final page of the assignment statin

CHEMICAL ENGINEERING 3A04 TEST 1
Duration: 2 hours
McMaster University
Dr. Todd Hoare
October 8, 2014
1. This test includes 4 problems on 2 pages (100 marks). You should ensure your paper is

ChE 3A04 Heat Transfer 2015 Assignment 5
Posted: Friday November 6
Due: Friday, November 13, in lecture
Note: This set of problems should be done individually and not as part of a group.
Problem #1
Do #5.51 from the course text Bergman et al 6th Edition (