Leaf Porometer Operator’s Manual
6. Leaf Porometer Theory
61
Next, we assume that all conductance values are in series so
that the flux is constant between any two nodes.
We also
assume that the temperature of the leaf is equal to the
temperature of the first humidity sensor.
(The sensor
block head has been constructed from aluminum to
eliminate the temperature difference.) This means that we
can write equation (1) for node 1 and the leaf node and then
set it equal to equation (8):
(10)
(11)
(12)
Solving for
g
s+
d1
:
(13)
)
(
1
1
C
C
g
F
leaf
d
s
vapor
−
=
+
[
]
)
1
)(
(
1
1
1
1
r
a
s
atm
d
s
vapor
h
T
e
P
g
F
−
=
+
[
]
[
]
)
(
)
(
ˆ
1
)
1
)(
(
2
2
1
1
2
1
1
1
a
s
r
a
s
r
atm
r
a
s
atm
d
s
T
e
h
T
e
h
d
D
P
h
T
e
P
g
−
=
−
+
ρ
[
]
)
1
)(
(
)
(
)
(
ˆ
1
1
2
2
1
1
2
1
r
a
s
a
s
r
a
s
r
d
s
h
T
e
T
e
h
T
e
h
d
D
g
−
−
=
+
ρ
