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

Abiodun A. Okunola, Timothy A. Adekanye, Clinton E. Okonkwo (), Mohammad Kaveh, Mariusz Szymanek (), Endurance O. Idahosa, Adeniyi T. Olayanju and Krystyna Wojciechowska
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Abiodun A. Okunola: Department of Agricultural and Biosystems Engineering, Landmark University, Omu-Aran P.m.b. 1001, Kwara State, Nigeria
Timothy A. Adekanye: Department of Agricultural and Biosystems Engineering, Landmark University, Omu-Aran P.m.b. 1001, Kwara State, Nigeria
Clinton E. Okonkwo: Department of Food Science, College of Food and Agriculture, United Arab Emirates University, Al Ain 15551, United Arab Emirates
Mohammad Kaveh: Department of Petroleum Engineering, College of Engineering, Knowledge University, Erbil 44001, Iraq
Mariusz Szymanek: Department of Agricultural, Forest and Transport Machinery, University of Life Sciences in Lublin, Głęboka 28, 20-612 Lublin, Poland
Endurance O. Idahosa: Department of Agricultural and Biosystems Engineering, Landmark University, Omu-Aran P.m.b. 1001, Kwara State, Nigeria
Adeniyi T. Olayanju: Department of Agricultural and Biosystems Engineering, Landmark University, Omu-Aran P.m.b. 1001, Kwara State, Nigeria
Krystyna Wojciechowska: Department of Strategy and Business Planning, Faculty of Management, Lublin University of Technology, Nadbystrzycka 38, 20-618 Lublin, Poland

Energies, 2023, vol. 16, issue 4, 1-21

Abstract: 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 (D eff ), activation energy (E a ), energy utilization (EU), energy utilization ratio (EUR), exergy loss (EX L ), exergy efficiency (EX eff ), improvement potential (IP), and exergetic sustainability index (ESI) were investigated. The results showed that increasing air temperature increased the DR, D eff , EU, EUR, EX L , EX eff , IP, and ESI, while increasing the slice thickness increased D eff and E a , but decreased the DR. The highest D eff and E a values were 4.2 × 10 −8 m 2 /s, and 53 KJ/mol, respectively. EU and EUR varied from 10 to 150 J/s and 0.39 to 0.79, respectively. EX L and EX eff 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 (R 2 = 0.9998), root mean square error (RMSE = 0.0049), and sum of square error (SSE = 0.0023).

Keywords: exergy efficiency; exergy sustainability index; water yam; drying rate; exergy loss (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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