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Lecture 16

PROCTECH 2EC3 Lecture 16: Week 9

7 Pages
44 Views
2018

Department
Process Automation Technology
Course Code
PROCTECH 2EC3
Professor
Kostas Apostolou
Lecture
16

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Week 9: March. 6th, 2018
Problem 1: Steam at
!"#$
and
%&'()
is expanded through a nozzle to
!##$
and
*&'()
. Negligible heat is
transferred from the nozzle to its surroundings. The approach velocity of the steam is negligible. Calculate the
exit steam velocity.
+,#
-
.
/
0,#
-
.
/
1,&2
34
5
6,#
7,#
Get
8
9
1
and
8
9
0
:
:
9
;
: Go to B.6 at
<0,%&'()
,
=>[email protected] ,=BCD ,;EF$G
At
!"#$
and
%&'()
it is superheated steam
Go to B.7 at
H0,!"#$&I<0,%&'()
,
Linear Interpolation:
JK,J0LMNOMP
QNOQP
R
SKTS0
U
,!VWXL1YZ[O1Y\0
0]O^
R
%T"
U
_`aFbcd&ef
eg
:
9
`
: Go to B.6 at
<1,*&'()
,
=>[email protected] ,=BCD ,;hbcE$G
At
*##$
and
*&'()
it is superheated steam
Open System:
Energy Balance:
38
5
L34
5
iL34
5
6,+
5
T7
5
38
5
L34
5
i,#
j
5k
8
9
1T8
9
0
l
L
m
X
!j
5
-
.
/
11TX
!j
5
-
.
/
01
n
,#
8
9
1T8
9
0LX
!-
.
/
11,#
o
.
.
/
`,
p
`
k
:
9
;T:
9
`
l
Go to B.7 at
H1,!##$&I&<1,*&'()
,
Linear Interpolation:
JK,J0LMNOMP
QNOQP
R
SKTS0
U
,!q%"L1r^^O1rs^^
^O0
R
*TX
U
_`dEt&ef
eg
Units:
u
vw ,x&y&z
vw ,
{
|}&y~
N
z
vw ,zN
N
o
.
.
/
`,
p
`
k
:
9
;T:
9
`
l
,
!
R
!V"ƒcqT!qW#
U
„…
„†&yX###&…
X&„… &_hbbc;`d
B
7.25. A fuel oil is burned with air in a boiler furnace. The combustion produces
qXƒ&„7
of thermal energy, of
which 65% is transferred as heat to boiler tubes that pass through the furnace. The combustion products pass
from the furnace to a stack at
W"#$
. Water enters the boiler tubes as a liquid at
!#$
and leaves the tubes as
saturated steam at
!#&'()
absolute.
a. Calculate the rate {
vw
ˆ
at which steam is produced.
H0,!#$
<1,!#&'()
j
5
1,&2
+,qXƒ&„7yW"‰
34
5
i,#
34
5
6,#
7
5
,#
Open System: Material coming in and Material going out
Energy Balance:
38
5
L34
5
iL34
5
6,+
5
T7
5
38
5
,+
5
81T80,+
5
j
5
18
9
1Tj
5
08
9
0,
j
5k
8
9
1T8
9
0
l
,
5
,Š
5
:
9
`T:
9
;
j51,j50

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Description
th Week 9: March. 6 , 2018 Problem 1: Steam at 250 and 7 is expanded through a nozzle to 200 and 4 . Negligible heat is transferred from the nozzle to its surroundings. The approach velocity of the steam is negligible. Calculate the exit steam velocity. Open System: = 0 = 0 Energy Balance: + + = = ? 0 + = 1 1 = 0 + = 0 2 2 + = 0 2 Get nd : : Go to B.6 at = 7 , = = At 250 and 7 it is superheated steam Go to B.7 at = 250 ; = 7, Linear Interpolation: = ( ) = 2961 + (7 5 . Go to B.6 at 4 , = = . At 400 and 4 it is superheated steam
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