The performance, thermal parameters and drying kinetics of muskmelon are calculated in an indirect natural convection solar dryer (INCSD) and indirect forced convection solar dryer (IFCSD). The initial moisture content (MC) of muskmelon slices was 12.4156 kg/kg of db (db) and it declined to 0.1605 db in 15, 18 and 22 h in IFCSD, INCSD and open sun drying (OSD), respectively. The estimated collector and drying efficiencies (ηcl and ηdr) were 58.5 and 9.39% in INCSD and the same were 66.37 and 12.11% in IFCSD, respectively. The specific moisture extraction rate (SMER) was 0.544 and 0.6204 kg/kWh in INCSD and IFCSD, respectively. The Verma model was relevant to fit the drying characteristics of muskmelon in INCSD, IFCSD and OSD. The thermal parameters such as effective moisture diffusivity (Defm), surface transfer coefficients (hht and hmt) and activation energy (Eac) were also determined for both setups. The average increment of 13.45% on ηcl, 28.97% on ηdr, 14.04% on SMER, 24.08% on Defm, 55.36% on hht, 55.16% on hmt, and 24.83% on Eac were observed in IFCSD than INCSD. The Eac of muskmelon slices was 38.06 and 28.61 kJ/mol in INCSD and IFCSD, respectively. Uncertainty analysis was performed and error bars were included in all the plots.
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Mugi et al. (2022) studied this question.
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