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EML 4147C
Test 1, Open book, closed notes
Name ____________________
Be very careful with units.
If the units aren’t right, the answer is not right.
1a)
What is the value of
q
r
?
a)
10198 W/m
2
b)
10198 W
c)
23481 W/m
2
d)
23481 W
e)
23481 W
1b)
What is the value of the uncertainty in
q
r
due to the uncertainty in
r
2
?
a)
183904 W
b)
183904 W/m
2
c)
183.9 W
d)
1839 W
e)
0.018 W
1c)
The uncertainty in
q
r
due to the uncertainty in
r
2
is what percent of the total heat transfer rate?
a)
18%
b)
118%
c)
7.8%
d)
1.8%
e)
3.6%
2a)
What is the thermal resistance due to the stainless steel tube?
a)
8.351 x 10
4
W/K
b)
0.0017 K/W
c)
8.351 x 10
4
K/W
d)
1197.4 W/K
d)
0
2b)
What is the thermal resistance due to the fouling on the outside of the tube?
a)
0.0037 K/W
b)
272.3 K/W
c)
6.46 x 10
8
K/W
d)
0.141 K/Wm
e)
0.159 K/Wm
2c)
What is the coldside overall heat transfer coefficient
U
c
?
a)
228 W/mK
b)
218 m
2
K/W
c)
0.0689 W/m
2
K
d)
14.51 W/m
2
K
e)
225 W/m
2
K
3a)
Find the effective
radiation heat transfer coefficient .
a)
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This note was uploaded on 09/15/2011 for the course EML 4147C taught by Professor Abbitt during the Spring '11 term at University of Florida.
 Spring '11
 ABBITT

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