Eng6901 - Final Exam Sample Questions
Eng6901 Heat Transfer I
1
Final Exam Sample Questions
The nal exam in Eng6901 - Heat Transfer I consists of four questions: (1) energy balance (multimode heat transfer); (2) ns (analysis or design) with other stu (e.g
Eng6901 - Formula Sheet I (October 18)
1
1.1
1
Conduction Heat Transfer
Cartesian Co-ordinates
qx = qx00 Ax = kAx
dT
dx
Rth =
2T
2T
2T
q
1 T
+
+
+ =
2
2
2
x
y
z
k
t
L
kA
T (x) plane wall of thickness 2L, x = 0 at centerline, Ts,1 at x = L, Ts,2 at x = L,
1
Eng6901 Heat Transfer I
Quiz 1 Sample Questions
The first quiz in Eng6901 - Heat Transfer I is designed to test your skills in the solution
of realistic one-dimensional, steady-state conduction heat transfer problems. A quiz will consist
of two problems
Eng6901 - Formula Sheet 2
1
1.1
1
Conduction Heat Transfer
Cartesian Co-ordinates
qx = qx00 Ax = kAx
dT
dx
Rth =
2T
2T
2T
q
1 T
+
+
+ =
2
2
2
x
y
z
k
t
L
kA
T (x) plane wall of thickness 2L, x = 0 at centerline, Ts,1 at x = L, Ts,2 at x = L, steady state
Eng6901 - Heat Transfer I: Sample Final Exam Questions
1
The final exam in Eng6901 - Heat Transfer I consists of four questions involving steady-state
heat transfer. The questions could involve: (a) an energy balance (multimode heat transfer);
(b) fins (a
Eng6901 - Formula Sheet 3 (December 1, 2015)
1
1.1
1
Conduction Heat Transfer
Cartesian Co-ordinates
qx = qx00 Ax = kAx
dT
dx
Rth =
2T
2T
2T
q
1 T
+
+
+ =
2
2
2
x
y
z
k
t
L
kA
T (x) plane wall of thickness 2L, x = 0 at centerline, Ts,1 at x = L, Ts,2 at
PROBLEM 7.16
KNOWN: Temperature and velocity of atmospheric air in parallel flow over a plate of prescribed length
and temperature.
FIND: (a) Average heat transfer coeteient. (b) Local coefcient'af the friidp'oii'tr. (c) Plot the'van'ation
of the heat flu
PROBLEM 8.24
KNOWN: Inlet and outlet temperatures and velocity of fluid flow in tube. Tube diameter and
length.
FIND: Surface heat ux and temperatures at x 2 0.5 and 10 m.
SCHEMATIC:
l_L=10m
um: 0.2 m/s -
7; =25C c e -
D=127mm
_DTm o = 75 0C
9g
ASSUMP
Ran. sex sit
1.5 A freezer compartment consists of a cubical cavity
that is 2 m on a side. Assume the bottom to be per-
fectly insulated. What is the minimum thickness of
Styrofoam insulation (1: B 0.030 Wlm - K) that must
be applied to the top and side
Eng6901 - Quiz 2 Sample Questions
Eng6901 Heat Transfer I
1
Quiz 2 Sample Questions
The second quiz in Eng6901 - Heat Transfer I is designed to test your skills in the solution of steady
state heat transfer from nned surfaces, and transient heat transfer
$5 0W <
{l\\.\\\\.
m A$0_WN H
hazéom 3 EFL?
- s x . \ . . llI|l 4 f y
no 3.; EMS mmE no.3. 0V- [b auxst # Vvowdl .. uvx #1!
Uo\\n: rm.3 n
§ . .ml .n s. - a ..
MA In; J\..D .wawv 1 7 UK I +U
3\uo qiufo n mild + T0270; u
33 m3 933:4 038909.03:
_ t . .
Eng6901 - Heat Transfer I
1
1
Introduction
1.1
What is Heat Transfer?
Heat transfer is the transmission of energy due to a temperature difference.
Thermodynamics deals with equilibrium processes, and it can be used to determine the
temperatures at end s