Drying characteristics, kinetic modeling, energy and exergy analyses of Water Yam (Dioscorea alata) in a hot air dryer

Abstrakt

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 utilization (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).

Autorzy

Abiodun A. Okunola
Abiodun A. Okunola
Timothy A. Adekanye
Timothy A. Adekanye
Clinton E. Okonkwo
Clinton E. Okonkwo
Mohammad Kaveh
Mohammad Kaveh
Endurance O. Idahosa
Endurance O. Idahosa
Krystyna Wojciechowska
Krystyna Wojciechowska
artykuł
Energies
Angielski
2023
16
4
1569
otwarte czasopismo
CC BY 4.0 Uznanie autorstwa 4.0
ostateczna wersja opublikowana
w momencie opublikowania
2023-02-04
140
3
0
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