Exergetic analysis of deep-bed drying of rough rice in a convective dryer

Beigi, Mohsen; Tohidi, Mohammad; Torki-Harchegani, Mehdi

doi:10.1016/j.energy.2017.08.100

Cited by 79 publications

(56 citation statements)

References 43 publications

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“…According to some open literature [17,26,28], the exergy model of mixture can be expressed as Equation 11:…”

Section: Exergy Analysismentioning

confidence: 99%

“…• Exp) can be calculated followed by Equation (12). Additionally, according to some open literature [17,[28][29][30], the specific exergy of the mixture of dry air and water vapor can be calculated followed by Equation 13, so the mixed air flux entering and leaving the drying chamber (…”

Section: Exergy Analysismentioning

confidence: 99%

“…• IP), and exergetic sustainability index (SI) were adopted to evaluate the exergy performance of the drying system, and the indices were determined as follows, respectively [17,19,28]:…”

Section: Exergy Analysismentioning

confidence: 99%

“…A large number of studies about energy and exergy analysis in drying process [15][16][17][18][19][20] have been reported based on the quantity conservation of the energy consumption (First law of thermodynamics). For instance, Aviara et al investigated the performance of the native cassava starch drying in a tray dryer by using energy-exergy methodology and the results showed that exergy efficiency increased with increase in both drying air temperature and energy utilization and was lower than energy efficiency [21].…”

Section: Introductionmentioning

confidence: 99%

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Exergetic, Energetic, and Quality Performance Evaluation of Paddy Drying in a Novel Industrial Multi-Field Synergistic Dryer

et al. 2019

Energies

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The present work proposes a novel industrial multi-field synergistic dryer with a drying capacity of 3.45 t/h. The energy, exergy, and quality aspects of the drying process were studied. An energy–exergy methodology was employed to estimate the energetic and exergetic performance, heat loss characteristics and heat recovery behavior of the dryer. Additionally, the quality of the dried paddy seeds was evaluated by its crackle ratio, generation potential, and generation rate. The results showed that the overall energy and exergy efficiency ranged from 13.26% to 56.63% and 39.03% to 60.23%, respectively. The improvement potential rates of the whole system varied from the lowest 8.49 kW to the highest 15.83 kW and respectively accounted for 15.81%–29.48% of the total exergy input, indicating that the performance of the dryer is acceptable. The total recovered radiant energy and radiant exergy recover rate were respectively ascertained to be 237.64 MJ and 0.26 kW. As for the quality aspect, the generation potential and generation rate of the dried paddy seeds respectively ranged from 75% to 90% and 69% to 88% while the crackle ratio of the paddy seeds was 1%, which indicated that the quality performance of the dried seed is of economic viability.

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“…According to some open literature [17,26,28], the exergy model of mixture can be expressed as Equation 11:…”

Section: Exergy Analysismentioning

confidence: 99%

Section: Exergy Analysismentioning

confidence: 99%

“…• IP), and exergetic sustainability index (SI) were adopted to evaluate the exergy performance of the drying system, and the indices were determined as follows, respectively [17,19,28]:…”

Section: Exergy Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exergetic, Energetic, and Quality Performance Evaluation of Paddy Drying in a Novel Industrial Multi-Field Synergistic Dryer

et al. 2019

Energies

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“…For the past two to three decades, greenhouse structure is also being used for solar drying of agricultural products at low temperatures [12]. Many researchers have been working in the area of greenhouse dryers [6,13,14]. Few recent articles have reviewed the developments in solar greenhouse drying [15] and the applications of greenhouse drying [16].…”

mentioning

confidence: 99%

Energy and exergy analysis of greenhouse drying of ivy gourd and turkey berry

Subramani¹,

Sivakumar²,

Thirumalai³

et al. 2020

Therm sci

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Original scientific paper https://doi.org/10.2298/TSCI190602459SThis study deals with the performance evaluation of a simple low-cost greenhouse dryer using energy and exergy analysis. Drying experiments were conducted under the open Sun and in greenhouse dryer with two different cover sheets of ultra violet polyethylene and drip lock under passive mode and active mode for two vegetables with medicinal values: ivy gourd (coccinia grandis) and turkey berry (solanum torvum). Thermal efficiency, exergy efficiency, and improvement potential were evaluated and presented. The experiment showed that performance of the greenhouse dryer was better than the open sun drying. Thermal efficiencies were up to 30.64% and exergy efficiency values were up to 0.09% and the maximum values were obtained during the drying of ivy gourd with the drip lock sheet under active mode. The results showed that this dryer could be used for drying agricultural products at low cost by the farmers in order to produce value added products from their harvested products.Drying or dehydration of food products decreases the moisture in the products to reduce weight, for easy transportation and increase shelf life. Traditionally agricultural products have been dried under the open Sun. It is a simple and economic process but has a lot of disadvantages, like depending on weather, slow process, loss due to birds, dust and other contamination. Best quality of dried products can be achieved with industrial hot air dryers, but it requires a huge amount of energy. Approximately 9.25% of the available energy in the developed countries is being consumed by drying process [3]. So, new cost and energy effective systems are essential to reduce the energy consumption. The objective of a drying system is to supply more heat to the product than available in the ambient [4]. It needs a proper thermodynamic analysis of a drying system.Energy and exergy analysis using First and Second law of thermodynamics should be performed for finding out the energy interactions and thermodynamic behavior of a drying system [5]. The analysis of a dryer should provide a quantitative measure of inefficiencies for a designer to design better systems [6]. The exergy analysis delivers suitable information to select the appropriate design and operational procedure for better performance [7].Exergy is the maximum work attained from a stream of matter, heat or work as it comes to equilibrium with a reference environment [8]. By carrying out exergy accounting in smaller and smaller subsystems, we are able to draw a map of how the destruction of exergy is scattered over the engineering system [9]. The lesser thermal efficiency of drying systems, higher price of fossil fuel and electricity and the GHG emitted from drying systems increase the importance for exergy analysis of drying systems [10]. Various exergetic indicators used in food industry are absolute exergy loss, exergetic efficiency, improvement potential, exergy destruction ratio, entropy generation, and cumulative exergy loss. Grass...

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Exergetic and techno‐economic analysis of Moroccan horehound leaves (Marrubium vulgare L.) in forced convection solar and microwave drying

et al. 2022

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This paper aims to analyze solar and microwave drying of Horehound leaves (Marrubium vulgare) from an exergetic point of view. Solar drying tests in forced convection were performed at airflow rates (150 and 300 m 3 /h) and air-drying temperatures (60°C, 70°C, and 80°C), where the microwave tests were performed in microwave powers ranging from 50 to 450 kW. Four performance parameters were investigated: exergy of evaporation, exergy loss, and exergy efficiency, sustainability index, and the improvement potential rate of the drying chamber and drying process. The results show that the exergy efficiency increases with the increase of aerothermal conditions. Exegetic performances essentially depend on the drying air temperatures and the airflow rates. The exergy efficiency of the drying process is higher than that of the drying chamber. The drying characteristics of Horehound leaves treated under microwave irradiation is a crucial process to predict its moisture content design so as to optimize the drying process. The exergetic analysis presented in this manuscript shows an improvement in the sustainability index of the drying processes and the reducing

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Exergetic analysis of deep-bed drying of rough rice in a convective dryer

Cited by 79 publications

References 43 publications

Exergetic, Energetic, and Quality Performance Evaluation of Paddy Drying in a Novel Industrial Multi-Field Synergistic Dryer

Exergetic, Energetic, and Quality Performance Evaluation of Paddy Drying in a Novel Industrial Multi-Field Synergistic Dryer

Energy and exergy analysis of greenhouse drying of ivy gourd and turkey berry

Exergetic and techno‐economic analysis of Moroccan horehound leaves (Marrubium vulgare L.) in forced convection solar and microwave drying

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