PP Systems CIRAS-2 - Magnitude of Errors in RS

Addendum
CIRAS-2 Operator's Manual Version 2.04
- 164 -
When N = 0 or 1 then this equals -RB. This follows from the fact that with transpiration on one side only,
the boundary layer resistance to subtract is 2*RB, whereas the original calculation has subtracted only RB.
Substituting in equation (5) for E/D from equation (4)
RBeqRSD
E
ie
)(
1
:
RBeqRS
NN
RB
NN
eqRStrueRS
)(
1*25.0
25.01*
)()(
(6)
Magnitude of Errors in RS
We can determine the magnitude of the error for various values of RS, RB and N.
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0 10 20 30 40 50 60
% Distribution
Error in RS m
2
s mol
-1
RS = 1
RS = 12
1. R
B
= 0.45 m
2
s mol
-1
2. R
B
= 0.3 m
2
s mol
-1
3. R
B
= 0.15 m
2
s mol
-1
1
2
3