MCPE                                           Increase in T will leads to lower MC at             T=             30      ...
31.0   45.0   100   100   100   100   100   100   10032.2   47.5   100   100   100   100   100   100   100   0.033.3   50....
Recommended RH of                                                            60% or Water Activity                        ...
20   40       60        80   100   120      % Relative Humidity
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Task 5 sorption isotherm

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Task 5 sorption isotherm

  1. 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. 2. 31.0 45.0 100 100 100 100 100 100 10032.2 47.5 100 100 100 100 100 100 100 0.033.3 50.0 100 100 100 100 100 100 100 0 20
  3. 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 (mostdrying materials displayhysteresis in that the two isotherms are not identical) Paddy ads Paddy des
  4. 4. 20 40 60 80 100 120 % Relative Humidity

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