Exergy Analyses of Onion Drying by Convection: Influence of Dryer Parameters on Performance

Castro, María; Román, Celia; Echegaray, Marcelo; Mazza, Germán; Rodríguez, Rosa

doi:10.3390/e20050310

Cited by 24 publications

(14 citation statements)

References 21 publications

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“…EUR for the drying of rosemary samples was calculated using Equation (22), and its average values ranged from 0.246 to 0.502. Table 2 presents the average changes in EUR with temperature and air velocity.…”

Section: Energy Utilization Ratio (Eur)mentioning

confidence: 99%

“…Several studies have been undertaken using exergy and energy analysis of the drying processes of crops, such as potato slices in a continuous band dryer [14], rice in a convective dryer [15], mushroom slices in a hot air dryer [16], bananas in convective dryers [17,18], parboiled paddy rice in a LSU industrial dryer [19], drying corn in a new industrial dryer system [20], carrots in a convective dryer [21], onions in a convective dryer [22], turmeric in forced convection solar tunnel dryers [23,24], and carob pulp in a solar collector dryer [25].…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Evaluation of the Forced Convective Hybrid-Solar Dryer during Drying Process of Rosemary (Rosmarinus officinalis L.) Leaves

et al. 2021

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This study aimed to examine the energy and exergy indices of the rosemary drying process in a hybrid-solar dryer (HSD) and the effects of air-drying parameters on these thermodynamic indices. Drying experiments were carried out at four levels of air temperature (40, 50, 60, and 70 ∘C) and three levels of air velocity (1, 1.5, and 2 m/s). Energy and exergy were calculated by application of the first and second laws of thermodynamics. Based on the principal laws, energy efficiency, exergy losses, and exergetic improvement potential rate, were evaluated. The results showed that the energy utilization ratio (EUR) ranged from 0.246 to 0.502, and energy utilization (EU) ranged from 0.017 to 0.060 (kJ/s). Exergy loss and efficiency varied from 0.009 to 0.028 (kJ/s) and from 35.08% to 78.5%, respectively, and increased with increased temperature and air velocity. It was found that the exergy loss rate was affected by temperature and air velocity because the overall heat transfer coefficient was different under these conditions. By comparison, with increasing temperature and air velocity, the exergy efficiency increased. Because most energy is used to evaporate moisture, this behavior may be explained by improved energy utilization. The drying chamber sustainability index ranged from 0.0129 to 0.0293. This study provides insights into the optimization process of drying operations and operational parameters in solar hybrid dryers that reduce energy losses and consumption.

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Section: Energy Utilization Ratio (Eur)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamic Evaluation of the Forced Convective Hybrid-Solar Dryer during Drying Process of Rosemary (Rosmarinus officinalis L.) Leaves

et al. 2021

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“…In addition, heat lost from the dryer body can be another reason of low exergy efficiency. [67] It is worth noting that exergy lost from the dryer body happened when the body temperature was higher than the ambient temperature. Thus, heat transfer isolation can effectively reduce exergy losses from the body.…”

Section: Exergy Efficiencymentioning

confidence: 99%

Drying of organic blackberry in combined hot air-infrared dryer with ultrasound pretreatment

et al. 2020

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In this study, prediction and analysis of energy and exergy in a combined hot air-infrared dryer with ultrasound pretreatment for organic blackberry was carried out. The effect on product color and greenhouse gas (GHG) emission was assessed. To predict energy and exergy parameters such as energy utilization ratio, energy utilization, exergy loss, and exergy efficiency, both the artificial neural network (ANN) and adaptive neuro fuzzy inference system (ANFIS) methods were employed. Drying experiments were undertaken at three temperature levels of 50, 60, and 70 C in air speed of 1 m/s and ultrasound pretreatment time 15, 30, and 45 min, as compared to controlled samples (without pretreatment). Results demonstrated that by raising the inlet air temperature and ultrasound pretreatment time, color change rate decreased, while energy utilization and exergy efficiency increased. Energy and exergy prediction results by means of ANN and ANFIS methods showed that ANFIS method achieved a higher R2 and lower RMS as compared to ANN. The highest level of GHG emission (NO x , CO 2 ) was obtained at 50 C temperature for samples without pretreatment.

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“…They found that the exergy loss rates increases with the temperature and air velocity augmentation and the exergy efficiency increases with the air velocity augmentation. 28 The energy needed for drying depends on the nature of the product, its initial and final moisture contents and drying rate. Thus energy and exergy analysis needs to be carried out in order to quantify the energy needed for drying and to locate the exergy losses in the system.…”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analyses of coconut drying in a solar tunnel drier

Ayyappan¹,

kumar²,

Thulasiram³

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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This paper presents energy and exergy analyses of solar drying of coconuts in a hemispherical solar tunnel drier. Coconuts were dried from an initial moisture content of about 55% (w.b.) to 7% (w.b.) in the solar tunnel drier in 60 hrs whereas the open sun drying process takes 153 hrs for reducing the moisture content to the same level. The drying experiments were conducted at a mass flow rate of 7.25 kg/s with an average air velocity of 0.1 m/s. Using the first law of thermodynamics, energy analysis was carried out to estimate the amount of energy received by the solar tunnel drier and the ratios of energy utilization. However, exergy analysis was accomplished to determine the exergy loss and exergy efficiency by applying the second law of thermodynamics. Energy utilization, energy utilization ratio, exergy inflow and exergy loss in the drier were studied and these values are found to be increased with increasing solar radiation. The exergy inflow and exergy loss in the drier varied between 0.194 kJ/s–8.18 kJ/s and 0.085 kJ/s–5.377 kJ/s respectively. The exergy efficiency of the drier varied between 23.6%–53%.

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Exergy Analyses of Onion Drying by Convection: Influence of Dryer Parameters on Performance

Cited by 24 publications

References 21 publications

Thermodynamic Evaluation of the Forced Convective Hybrid-Solar Dryer during Drying Process of Rosemary (Rosmarinus officinalis L.) Leaves

Thermodynamic Evaluation of the Forced Convective Hybrid-Solar Dryer during Drying Process of Rosemary (Rosmarinus officinalis L.) Leaves

Drying of organic blackberry in combined hot air-infrared dryer with ultrasound pretreatment

Energy and exergy analyses of coconut drying in a solar tunnel drier

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