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Ponchon – Savarit Method
H
y
x
y=x
Equilibrium line
H(x)
H(y)
Xe
Ye
• By using the Hxy diagram
and the y = x line, the
equilibrium curve can be
constructed on the y vs. x
diagram
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H
y
x
y=x
Eqm.
Curve
H(x)
H(y)
E
F
D
A
C
B
y
n+1
x
d
x
n
(x
D,
H
D
)
(x
n,
y
n+1
)
AC
BC
x
x
y
x
V
L
n
D
n
D
n
n
=
−
−
=
+
+
1
1
D
q
c
CE
DE
H
Q
H
Q
V
L
n
x
n
y
n
n
=
−
−
=
+
+
,
1
,
1
'
'
D
q
H
Q
c
D
+
=
'
,
1
+
=
=
n
n
V
L
CE
DE
AC
BC
Because
A, F & E lie on a straight
line, i.e.,
lie on a straight line.
)
'
,
(
),
,
(
),
,
(
1
,
1
,
Q
x
H
y
H
x
D
n
y
n
n
x
n
+
+
Ponchon – Savarit Method
tie line
•The rectifying operating line can be drawn by
choosing a set of x
n
’s and finding the
corresponding y
n+1
’s from the Hxy diagram.
•Another way: Computer (x
n
, y
n+1
) tray by tray
(for a total condenser):
•Find H
x
0
, H
y1
@ x
D
•V
1
is in equilibrium with L
1
by
following a tieline.
•Draw a straight line between Q’ and H
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This note was uploaded on 04/15/2008 for the course CHEE 3462 taught by Professor Mohanty during the Spring '07 term at University of Houston.
 Spring '07
 Mohanty

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