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Lecture 16

# PROCTECH 2EC3 Lecture Notes - Lecture 16: Ideal Gas, Thermostat, Pressure Measurement

7 pages48 views2018

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,%&'()
,
=>?@A ,=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,*&'()
,
=>?@A ,=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

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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