Quiz 2
CHE 210 Heat and Mass Transfer
Winter 2014
Prof. Radisic
Determine the heat transfer rate per square meter of wall area for the case of a furnace
with inside air at 1340K. The furnace wall is composed of a 0.106m layer of fireclay
brick and 0.635 c
Midterm Exam
CHE 210 Heat and Mass Transfer
Feb 22, 2010
Prof. Radisic
1 Page (8.5 by 11) of notes allowed
2 hr
Out of 20 pt
Name:
Problem #1 161m: 100,0001b/hr of water (Cp=1 Btu/1b °F) are to pass through a heat
exchanger, which is to raise the wate
CHE210 Heat and Mass Transfer Winter 2015
Final Examination
April 29th, 2015
Duration: 2.5 h
Out of 100 pts
NAME:
STUDENT NUMBER:
INSTRUCTIONS:
Exam Type A: a closed book examination, no
Solution to Problem #5 Handout 1
PROBLEM
A block of 1 kg of Copper at 20 C is dropped into liquid nitrogen whose
temperature is 77.3 K. How many grams of liquid nitrogen boil away in order for
the copper
PROBLEM 2.66
KNOWN: Temperature as a function of position and time in a plane wall suddenly subjected to a
change in surface temperature, while the other surface is insulated.
FIND: (a) Validate the temperature distribution, (b) Heat fluxes at x = 0 and x
Q
Q
q
Q
A
W=p
Q= E
U
p
q
W
W
Q
T
T
Q
x
q
x
Q
x
x
T
T
Q
x
T
Qx
x
A
T A
x
qx
Qx
A
T
x
x
A
x
qx
Q
k
T
x
qn
T
x
qx
W
m K
k
k
T
n
qy
qn
qn
k
qx
qn
T
n
y
x
k
k
qx
mcw
k
dT
dx
k
qx x
x
T
T
QL A T
T
Q We V I
qx
A
V
L
I
x
T
x
dT
dx
dT
dx
qx
qx
k
k
ke
kl
dT
dx
qx
k
r
r
k
T
h
k
k
qx
k
dT
dx
k
T
T
L
T
T
L
k
Qx
kA
dT
dx
kA
T
T
L
T
T
L
kA
I
V
V
Re
I
T
T
Q
R
V
V
Re
T
T
R
L
kA
Rwall
K
C
or
W
W
R
L
k
Rwall
m K
m C
or
W
W
T h
q conv
T
T
T
h
T
T
Rconv
k
T
T
L
k
T T
Rwall
T
q wall
T
T
x
q conv
h T
L
T
T
h
T T
Rconv
qx
T
T
x
Ts
T
h As
T
h
As
n
n
h
car radiators
air-conditioner cooling and heating
coils
x
x
p
Ac
w t
T
h
hcombined
T
Tx
Tx
dT x dx
hconv
Tx
hrad
h
wt
E in
Qcond x
E out
Qcond
Qcond
x
dQcond
x
kAc
dT
dx
d
dT
kAc
dx
dx
kAc
k
dAc dT
dx dx
dAc dT
Ac dx dx
d T
dx
k Ac
finite difference method
method
finite volume
finite element method
discretization
M N
m n
m
M
n
N
m n
m n
m
n
m n
m n
m n
a
b
cm
cm
k
WmK
Tin
hin
Wm K
Tout
x
y
hout
Wm K
cm
W
C
T
y
T
hout
cm
cm
T
hout
C
Wm K
y
T
hin
C
Wm K
cm
C
Wm K
T
x
x
T
hin
cm
C
Wm
FORCED CONVECTION: DIMENSIONAL ANALYSIS
The problem of convection is to determine the convective heat transfer coefficient, h. If the
value of h is measured for a body of a given shape (for example, a cylinder) in a number of different
fluids, it can be
T
Tsurr
As Ts
Tsurr
Qcond
T
Qcond
Qconv Qrad
hconv A Ts T
Qcond
Qconv Qrad
hconv A Ts T
Qconv Qrad
hconv
Tsurr T
A Ts
Tsurr
hrad A Ts Tsurr
hrad A Ts T
hcombined A Ts T
Tsurr T
T
Ts
Ts
T
Ts
T
Tsurr
Ti
qu
To
qu
To Ti
cw
qn
kn
T
n
T
Tx y z t
qn
qxi q y j q
Week 7 Lecture Note: MEC701 HEAT TRANSFER
1/5
Transient Heat Conduction (Chapter 4, section 4-1)
Transient is also called unsteady or time dependent.
Consider a steady heat transfer through a wall from the left boundary (specified T1) to the right
bounda
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(hIEQIDS (2007) Final Iixam
PRINT:
Surname _o_
First Name __
Student Number _
University of Toronto
Faculty of Applied Science and Engineering
FINAL EXAMINATION, APRIL 2007
SECOND YEAR - PROGRAM 6
ChEZlOS FUNDAMENTALS OF HEAT
UNIVERSITY OF TORONTO
FACULTY OF APPLIED SCIENCE AND ENGINEERING
FINAL EXAMINATION, Apr 22, 2010
Time: 2PM
Duration 2.5 hr
Second Year Chemical Engineering
CHE21OH1 Heat and Mass Transfer
Calculator Type: D
Two pages of notes doubles sided on Faculty a
Midterm Exam
CHE 210 Heat and Mass Transfer
Feb 13, 2012
Prof. Radisic
2 hr
Out of 20 pt
Name:_
Problem #1 (5pt): The steady state temperature distribution in a one-dimensional wall of
thermal conductivity 50 W/mK and thickness 50mm is observed to be T(oC
Quiz 3
CHE 210 Heat and Mass Transfer
Winter 2014
Prof. Radisic
A 2kW resistance heater wire whose thermal conductivity is k=15W/mK has a diameter
of D=4mm and a length of L=0.5m and is used to boil water. If the outer surface
temperature of the resistanc
Quiz 4
CHE 210 Heat and Mass Transfer
Winter 2014
Prof. Radisic
Name:
Student number:
Hot water at 100oC is transported through a smooth steel pipe 10 cm in diameter for heating
purposes at the flow rate of 2.83 *10-2 m3/hr. The inner surface of the pipe
Quiz 1
CHE 210 Heat and Mass Transfer
Jan 18, 2010
Prof. Radisic
Closed book and closed notes
1hr
Out of 5pt
The cross section of a storm window is shown in the sketch. How
much heat will be lost through a window measuring 1.83m by
3.66m on a cold day whe
CHE-2103 Heat and Mass Transfer Quiz #1 Jan. 26"], 2009 Name :--.j 1- '
Student numb
Problem 1
a) Can you cite 3 areas in which heat transfer plays a signicant role?
b) What are the three fundamental mechanisms of heat transfer?
0) How are Fon