Energy and exergy analyses of okra drying process in a forced convection cabinet dryer

Okunola A., Adekanye T., Idahosa E. (2021): Energy and exergy analyses of okra drying process in a forced convection cabinet dryer. Res. Agr. Eng., 67: 8–16.

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A forced convection automatic cabinet dryer integrated with a data logger was designed and fabricated. The okra samples were dried in the dryer at drying temperatures of 50, 60, and 70 °C and at three different load densities of 200, 300, and 400 g at a continuous air velocity of 0.7 m·s–1. Energy and exergy analyses of the drying process were performed. The obtained results showed that the energy efficiency, energy utilisation, and utilisation ratio increased from 26.59 to 68.24%, 5.47 to 114.36 W, and 0.36 to 0.71 as the temperature increased to 70 °C, respectively. The inflow, outflow, and exergy losses were in the range of 7.02 to 26.14 W, 4.43 to 14.16 W, and 2.59 to 11.98 W, respectively, while exergy efficiency varied from 49.15 to 63.47%. The findings show that exergy efficiencies decrease with an increase in the drying temperature, but increase with a lower load rate. The index of sustainability varies from 2.14 to 2.77, the value increases as the load density decreases while it decreases with a temperature increment.

Abbaspour-Gilandeh Y., Jahanbakhshi A., Kaveh M. (2019): Prediction kinetic, energy and exergy of quince under hot air dryer using ANNs and ANFIS. Food Science & Nutrition, 8:1347.
Adekanye T., Babaremu K, Okunola A. (2019): Evaluation of an active evaporative cooling device for storage of fruits and vegetables. Agricultural Engineering International: CIGR Journal, 21: 203–208.
Aghbashlo M., Mobli H., Rafiee S., Madadlou A. (2012): Energy and exergy analyses of the spray drying process of fish oil microencapsulation. Biosystems Engineering, 111: 229–241.
Akpinar E.K. (2005): Energy and exergy analyses of drying of eggplant slices in a cyclone type dryer. Journal of Mechanical Science and Technology, 19: 692–703.
Akpinar E.K. (2007): Thermodynamic analysis of strawberry drying process in a cyclone type dryer. Journal of Scientific and Industrial Research, 66: 152–161.
Akpinar E.K. (2011): Drying of parsley leaves in a solar dryer and under open sun: modeling, energy and exergy aspects. Journal of Food Process Engineering, 34: 27–48.
Akpinar E.K, Midilli A, Bicer Y. (2005): Energy and exergy of potato drying process via cyclone type dryer. Energy Conversion and Management, 46: 253–265.
Akoroda M.O. (2011): Botany of Telferia occidentalis (Cucurbitaceae) among Igbos of Nigeria. Economic Botany 44: 29–39.
Aviara N.A., Onuoha L.N., Falola O.E., Igbeka J.C. (2014): Energy and exergy analyses of native cassava starch drying in a tray dryer. Energy, 73: 809–817.
Azadbakht M., Aghili H., Ziaratban A., Torshizi M.V. (2017): Application of artificial neural network method to exergy and energy analyses of fluidized bed dryer for potato cubes. Energy, 120: 947–958.
Beigi M. Tohidi M. Torki-Harchegani M. (2017): Exergetic analysis of deep-bed drying of rough rice in a convective dryer. Energy, 140: 374–382.
Colak N., Hepbasli A. (2007): Performance analysis of drying of green olive in a tray dryer. Journal of Food Process Engineering, 20: 1188–1193.
Colak N., Kuzgunkaya E., Hepbasli A. (2008): Exergetic assessment of drying mint leaves in a heat pump dryer. Journal of Food Process Engineering, 31: 281–298.
Dincer I. (2002): Exergy as a potential tool for sustainable drying systems. Sustainable Cities and Society, 1: 91–96.
Erbay Z., Icier F. (2011): Energy and exergy analysis on drying of olive leaves (Olea europaca L.) in tray drier. Journal of Food Process Engineering, 34: 2105–2123.
Erbay Z., Koca N. (2012): Energetic, exergetic, and exergoeconomic analyses of spray-drying process during white cheese powder production. Drying Technology, 30: 435–444.
Hancioglu E., Hepbasli A., Icier F., Erbay Z., Colak N. (2010): Performance investigation of the drying of parsley in a tray dryer system. International Journal of Exergy, 7: 193–210.
Iheke R.O. (2010): Market access, income diversification and welfare status of rural farm households in Abia State. Nigeria. Nigeria Agricultural Journal, 4: 13–18.
Kaveh M., Ahmad J., Yousef A., Ebrahim T., Mohammad B.M. (2018): The effect of ultrasound pre-treatment on quality, drying, and thermodynamic attributes of almond kernel under convective dryer using ANNs and ANFIS network. Journal of Food Process Engineering, 41:e12868.
Liu Z., Bia J., Wang S., Meng J., Wang H., Yu X., Gao Z., Xiao H. (2019): Prediction of energy and exergy of mushroom slices drying in hot air impingement dryer by an artificial neural network. Drying Technology, 149510454.
Maria C., Román C., Echegaray M., Mazza G., Rodriguez R. (2018): Exergy analyses of onion drying by convection: Influence of dryer parameters on performance. Entropy, 20: 310–322.
Midilli A., Kucuk H. (2003): Energy and exergy analyses of solar drying process of pistachio. Energy, 28: 539–356.
Motevali A., Minaei S. (2012): Effects of microwave pretreatment on the energy and exergy utilization in thin layer drying of sour pomegranate arils. Chemical Industry and Chemical Engineering, 18: 63–72.
Ngbede S.O., Ibekwe H.N., Okpara S.C., Onyegbule U.N., Adejumo L. (2014): An overview of okra production, processing, marketing, utilization and constraints in Ayaragu in Ivo local government area of Ebonyi State, Nigeria. Greener Journal of Agricultural Sciences, 4: 136–143.
Ojediran J.O., Raji A.O. (2010): Thin layer drying of millet and effect of temperature on drying characteristics. International Food Research Journal, 17: 1095–1106.
Ojediran J.O., Okonkwo C.E., Adeyi A.J., Adeyi O., Olaniran A.F., George N.E., Olayanju A.T. (2020): Drying characteristics of yam slices (Dioscorea rotundata) in a convective hot air dryer: Application of ANFIS in the prediction of drying kinetics. Heliyon, 6:e03555.
Omari A., Behroozi-Khazaei N., Sharifian F. (2018): Drying kinetics and artificial neural network modeling of the mushroom drying process in a microwave-hot air dryer. Journal of Food Process Engineering, 41: 1–10.
Rabha D., Muthukumar D., Somayaji C. (2017): Energy and exergy analyses of the solar drying processes of ghost chilli pepper and ginger. Renewable Energy, 105: 764–773.
Semon M., Nielsen R., Jones M.C., Couch S.R. (2005): The evidence for the elevated level of linkage disequilibrium caused by administration of okra and ecological adaptation. Genetics, 169: 1639–1647.
Ume S.I., Ezeano C.I., Okeke C.C., Gbughemobi B.O. (2016): Determinants of Okra (Abelmoschus esculentus) production and profitability in Ayamelum local government area of Anambra State, Nigeria. Case Studies Journal, 5: 76–83.
Ranjbaran M., Zare D. (2013): Simulation of energetic and exergetic performance of microwave assisted fluidized bed drying of soybeans. Energy, 59: 484–493.
Varmudy V. (2011): Marking Survey Need to Boost Okra Exports. Puttur, Vivekananda College.
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