Energy and exergy analysis of forced and natural convection indirect solar dryers: Estimation of exergy inflow, outflow, losses, exergy efficiencies and sustainability indicators from drying experiments

Mugi, Vishnuvardhan Reddy; Chandramohan, V.P.

doi:10.1016/j.jclepro.2020.124421

Cited by 114 publications

(39 citation statements)

References 26 publications

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“…Kavak Akpinar [45] reported similar SI values ranging from 0.393 to 6.156. Mugi and Chandramohan [46] temperature and air velocity increased the IP. Aviara, Onuoha, Falola and Igbeka [38] stated that the improvement potential linearly increases with the increase in the drying air temperature.…”

Section: Sustainability Index (Si)mentioning

confidence: 91%

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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: Sustainability Index (Si)mentioning

confidence: 91%

“…Kavak Akpinar [45] reported similar SI values ranging from 0.393 to 6.156. Mugi and Chandramohan [46] reported SI values between 1.19 and 17.05 W.…”

Section: Sustainability Index (Si)mentioning

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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“…An energy and exergy analysis by Mugi & Chandramohan [46] was done during the drying of okra (Abelmoschus esculentus) using an indirect solar dryer (ISD) with natural convection. The average efficiency of the collector was 61.49% during natural convection ISD (NISD)and 74.98% using forced convection ISD (FISD) due to a higher mass flow rate.…”

Section: Figure 8 Indirect Solar Dryermentioning

confidence: 99%

Recent advances in solar drying system: A Review

Razak

Tarminzi²,

Azmi³

et al. 2021

IJETS

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Research on solar dryer technology proliferates since it reduces the drying period while keeping nutritional values in the agricultural products. This paper presented a review of recent advances in the solar drying system. This review is composed of working principles and classifications of solar dryers. They were classified into two main elements: airflow modes, either passive or active, and the way heat is transferred: direct, indirect, mixed-mode, and hybrid. The hybrid system used several types of elements to supply additional heat in the drying system, as elaborated in this paper, such as the electrical heater, biomass, and photovoltaic system. The advantages and disadvantages of the solar dryer also being discussed in this paper

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“…Free, natural, convection is a popular phenomenon in many applications in which the fluid flow is controlled by bouncy without applying any external forces. Natural convection in the closed enclosure has attracted many researchers, who apply an extensive study to modify the possibility of heat transfer manipulation because it plays a major role in many engineering applications such as cooling systems of chips and microelectronic devices, reactors, geothermal systems, and solar collectors [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of MHD Natural Convection in Trapezoidal Enclosure Filled With (50%MgO-50%Ag/Water) Hybrid Nanofluid: Heated Sinusoidal from Below

Alomari¹,

Al‐Farhany²,

Hashem³

et al. 2021

IJHT

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Numerical simulation of MHD free convection in a two-dimensional trapezoidal cavity of a hybrid nanofluid has been carried out in this research. The cavity is heated sinusoidal from the bottom wall, and the inclined walls are cooled while the top wall is isolated. The hybrid nanofluid (MgO-Ag/water) has been used as a working fluid. The numerical simulation has been validated with past papers and met a good agreement. The considered parameters are a range of Rayleigh number (Ra= 103 to 106), Hartmann number (Ha= 0 to 60) and volume fraction (f= 0 to 0.02). The results are presented as isotherms, stream functions, local and average Nusselt numbers, from which it is observed that the strength of the stream functions and isotherms increases with the increase of the Ra and ϕ while the increase in Hartmann number reduce the circulation of the flow and increases the isotherms strength. Also, the Nusselt number is increases with Ra and ϕ while it decreases with Ha.

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Energy and exergy analysis of forced and natural convection indirect solar dryers: Estimation of exergy inflow, outflow, losses, exergy efficiencies and sustainability indicators from drying experiments

Cited by 114 publications

References 26 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

Recent advances in solar drying system: A Review

Numerical Study of MHD Natural Convection in Trapezoidal Enclosure Filled With (50%MgO-50%Ag/Water) Hybrid Nanofluid: Heated Sinusoidal from Below

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