Table 6 Thermodynamic properties of OD and HSDS for ESML under different drying temperatures and layers thicknesses.

From: Comparative analysis of drying kinetics, diffusivity, and thermodynamic properties of hybrid solar and oven dryers for Egyptian sweet marjoram

Drying system

DAT, ºC

LT, cm

Enthalpy (ΔH), kJ mol− 1

Entropy (ΔS), kJ mol− 1 K− 1

Gibbs free energy (ΔG),

kJ mol− 1

OD

50

1

29.27

-0.175

85.78

2

31.96

-0.192

93.85

3

24.99

-0.176

81.82

60

1

29.18

-0.175

87.53

2

31.87

-0.192

95.77

3

24.91

-0.176

83.58

70

1

29.10

-0.175

89.28

2

31.79

-0.192

97.69

3

24.83

-0.176

85.35

HSD

50

1

29.99

-0.177

87.05

2

39.22

-0.213

107.95

3

24.67

-0.173

80.68

60

1

29.91

-0.177

88.82

2

39.13

-0.213

110.08

3

24.58

-0.174

82.41

70

1

29.83

-0.177

90.58

2

39.05

-0.213

112.21

3

24.50

-0.174

84.15