Drying Characteristics, Kinetic Modeling, Energy and Exergy Analyses of Water Yam (Dioscorea alata) in a Hot Air Dryer

Okunola, Abiodun A. and Adekanye, T. A. and Okonkwo, Clinton E. (2023) Drying Characteristics, Kinetic Modeling, Energy and Exergy Analyses of Water Yam (Dioscorea alata) in a Hot Air Dryer. Energies, 16 (1569). pp. 1-21.

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In this study, drying characteristics, kinetic modelling, energy and exergy analyses of a convective hot air dryer are presented for water yam. The drying experiments were carried out at temperature levels of 50, 60, and 70 ◦C and slice thicknesses of 3, 6, and 9 mm. The effects of drying variables on the drying rate (DR), moisture diffusivity (Deff), activation energy (Ea), energy utiliza�tion (EU), energy utilization ratio (EUR), exergy loss (EXL), exergy efficiency (EXeff), improvement potential (IP), and exergetic sustainability index (ESI) were investigated. The results showed that increasing air temperature increased the DR, Deff, EU, EUR, EXL, EXeff, IP, and ESI, while increasing the slice thickness increased Deff and Ea, but decreased the DR. The highest Deff and Ea values were 4.2 × 10−8 m2/s, and 53 KJ/mol, respectively. EU and EUR varied from 10 to 150 J/s and 0.39 to 0.79, respectively. EXL and EXeff varied between 2 and 12.5 J/s and 58 to 75%, respectively. Midilli’s model had the best performance in predicting the moisture ratio of water yam with coefficient of determination (R2 = 0.9998), root mean square error (RMSE = 0.0049), and sum of square error (SSE = 0.0023).

Item Type: Article
Uncontrolled Keywords: exergy efficiency; exergy sustainability index; water yam; drying rate; exergy loss
Subjects: S Agriculture > S Agriculture (General)
T Technology > T Technology (General)
T Technology > TD Environmental technology. Sanitary engineering
Divisions: Faculty of Engineering, Science and Mathematics > School of Mathematics
Date Deposited: 12 Jan 2024 15:31
Last Modified: 12 Jan 2024 15:31
URI: https://eprints.lmu.edu.ng/id/eprint/4343

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