1. MCPE
Increase in T will leads to lower MC at
T= 30
the same RH and will reduce the C1 30.0
RH exp exp C3 MC A plot of EMC
difference bewteen des and ads
T C2 (equilibrium
isotherms.
moisture content) at 25.0
Coefficients DataSet1 DataSet2 DataSet3 DataSet6 DataSet7 DataSet13 DataSet14 a given temperature
versus the relative
Moisture Content
20.0
Padddy, des Brown, des Paddy, ads Paddy, ads Paddy, des Paddy, ads Paddy, des humidity is termed
C1 1.1501E+03 1.05E+03 7.32E+02 3.13E+02 5.06E+02 5.55E+02 4.94E+02 as sorption
isotherm. 15.0
C2 7.6595E+01 9.90E+01 9.0609E+05 2.2437E+01 1.73E+01 7.2170E+01 5.7373E+01
C3 2.5530E-01 1.90E-01 2.01E-01 2.34E-01 2.60E-01 1.69E-01 1.67E-01
10.0
Now I know that I
can store my brown
rice at a higher EMC 5.0
Y-Axes X-Axes
than paddy
DataSet1 DataSet2 DataSet3 DataSet6 DataSet7 DataSet13 DataSet14
MC MC RH RH RH RH RH RH RH 0.0
% w.b. % d.b. % % % % % % % 0 10 20
0.0 0.0 0 0 100 0 0 0 0
2.4 2.5 0 1 100 4 0 3 2
4.8 5.0 5 4 100 16 5 10 9
7.0 7.5 20 14 100 36 22 22 20
60.0
9.1 10.0 43 30 100 56 45 37 34
11.1 12.5 64 47 100 73 66 52 49 The two isotherms
13.0 15.0 79 62 100 84 81 65 63 50.0 almost identical (most
14.9 17.5 88 75 100 91 89 75 74 drying materials display
16.7 20.0 94 83 100 95 94 83 82 Now I know that paddy hysteresis
40.0
Moisture Content
18.4 22.5 97 89 100 97 97 89 88 can absorb almost same isotherms are not
20.0 25.0 98 93 100 98 98 92 92 amount of water if
exposed to higher RHs
identical)
21.6 27.5 99 96 100 99 99 95 94 30.0
23.1 30.0 99 97 100 99 100 97 96
24.5 32.5 100 98 100 100 100 98 98
25.9 35.0 100 99 100 100 100 99 98 20.0
27.3 37.5 100 99 100 100 100 99 99
28.6 40.0 100 100 100 100 100 99 99
10.0
29.8 42.5 100 100 100 100 100 100 100

2. 31.0 45.0 100 100 100 100 100 100 100
32.2 47.5 100 100 100 100 100 100 100 0.0
33.3 50.0 100 100 100 100 100 100 100
0 20

3. Recommended RH of
60% or Water Activity
of 0.6 ( required to
control fungi and
bacteria growth)
Desorption
Paddy des
Brown Rice des
20 30 40 50 60 70 80 90 100
% Relative Humidity
The two isotherms are
almost identical (most
drying materials display
hysteresis in that the two
isotherms are not
identical)
Paddy ads
Paddy des

4. 20 40 60 80 100 120
% Relative Humidity