Table 1 Process variables and their levels.

From: Optimization of fluidized bed drying process parameters and quality evaluation of ready to use onion slices

Process Variables

Coded Levels of Treatment

−1.682

(-α)

−1

0

+ 1

+ 1.682 (+α)

Name

Actual levels of Treatments

Drying Temperature (oC)

43.18

50

60

70

76.82

NaCl concentration (%)

6.59

10

15

20

23.41

Bed Thickness(mm)

1.636

3

5

7

8.362

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